WO2022105514A1 - Page turning simulation method for electronic book, and electronic device and computer storage medium - Google Patents

Abstract

Disclosed are a page turning simulation method for an electronic book, and an electronic device and a computer storage medium. The method comprises: in response to a received page turning instruction, adding shadow elements to an original book page, so as to obtain a page-turning book page; acquiring the displacement variation of a page-turning change position of a page-turning reference point in the page-turning book page relative to an initial page position of the page-turning reference point, and according to the displacement variation, determining a page-turning action area contained in the page-turning book page; and acquiring the initial page positions of page image units and shadow elements contained in the page-turning action area, and calculating and displaying the page-turning change positions of the page image units and shadow elements contained in the page-turning action area.

Description

Simulated page-turning method, electronic device and computer storage medium for e-book

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application filed on November 23, 2020 with the application number 202011322290.3 and entitled "E-book page-turning method, electronic device and computer storage medium", the entire content of which is approved by Reference is incorporated in this application.

technical field

The present disclosure relates to the field of computers, and in particular, to a simulated page-turning method for an electronic book, an electronic device, and a computer storage medium.

Background technique

At present, with the increasing popularity of electronic devices, more and more users are accustomed to reading e-books through electronic devices. E-books are portable, and users can open e-books to read anytime, anywhere. In a traditional way, when a user performs a page turning operation through an electronic book, the page content conversion process will be completed by means of instantaneous page switching.

However, the above-mentioned page turning method is rather obtrusive, and cannot simulate the traditional paper-based page turning method. For example, when a user reads a paper book, the page turning operation is usually completed by lifting a corner of the book page to make the book page appear in a curled state. It can be seen that the existing e-book page turning method cannot simulate the page turning effect of a real paper book.

public content

In view of the above problems, the present disclosure is proposed in order to provide an electronic book simulation page turning method, electronic device and computer storage medium that overcome the above problems or at least partially solve the above problems.

According to an aspect of the present disclosure, there is provided a method for simulating page turning of an electronic book, comprising:

In response to the received page-turning instruction, a shadow element is added to the original book page to be turned to obtain a page-turning book page containing the shadow element;

Obtaining the displacement change between the page-turning transformation position of the page-turning reference point in the page-turning book page and the page initial position of the page-turning reference point, and determining the page-turning action area included in the page of the page-turning book according to the displacement change;

Obtain the page initial position of each page image unit and shadow element included in the page-turning action area, calculate and display the page-turning transformation position of each page image unit and shadow element included in the page-turning action area, so as to realize the simulated page turning of the book. page processing.

According to another aspect of the present disclosure, an electronic device is provided, including: a processor, a memory, a communication interface, and a communication bus, and the processor, the memory, and the communication interface communicate with each other through the communication bus;

The memory is used to store at least one executable instruction, and the executable instruction causes the processor to perform the following operations:

In response to the received page-turning instruction, a shadow element is added to the original book page to be turned to obtain a page-turning book page containing the shadow element;

Obtaining the displacement change between the page-turning transformation position of the page-turning reference point in the page-turning book page and the page initial position of the page-turning reference point, and determining the page-turning action area included in the page of the page-turning book according to the displacement change;

Obtain the page initial position of each page image unit and shadow element included in the page-turning action area, calculate and display the page-turning transformation position of each page image unit and shadow element included in the page-turning action area, so as to realize the simulated page turning of the book. page processing.

According to yet another aspect of the present disclosure, a non-volatile computer-readable storage medium is provided, and at least one executable instruction is stored in the non-volatile computer-readable storage medium, and the executable instruction causes a processor to perform the following operations :

In response to the received page-turning instruction, a shadow element is added to the original book page to be turned to obtain a page-turning book page containing the shadow element;

Obtaining the displacement change between the page-turning transformation position of the page-turning reference point in the page-turning book page and the page initial position of the page-turning reference point, and determining the page-turning action area included in the page of the page-turning book according to the displacement change;

Obtain the page initial position of each page image unit and shadow element included in the page-turning action area, calculate and display the page-turning transformation position of each page image unit and shadow element included in the page-turning action area, so as to realize the simulated page turning of the book. page processing.

According to yet another aspect of the present disclosure, there is also provided a computer program product, the computer program product comprising a computing program stored on the above-mentioned non-volatile computer-readable storage medium. In the simulated page-turning method, electronic device and computer storage medium of an electronic book provided by the present disclosure, shadow elements can be added to the original book pages to be turned according to the page-turning instructions, so as to obtain page-turning book pages containing shadow elements, and according to the page-turning instructions The amount of displacement change between the page-turning transformation position of the page-turning reference point in the page-turning reference point relative to the page initial position of the page-turning reference point determines the page-turning action area included in the page-turning book page, so as to draw the page-turning action area in the page-turning action area. Each page image unit included and the page-turning position of the shadow element are included to realize the simulated page-turning processing of the book page. It can be seen that this method can display the page-turning state of the book presented by the curling process of the book page, give the user a visual experience of page-turning when reading a real paper book, and can also add shadow elements to the page, so that the page is turned The part behind the page has a shadow effect, which further enhances the effect of the simulated page turning.

The above description is only an overview of the technical solutions of the present disclosure. In order to understand the technical means of the present disclosure more clearly, it can be implemented according to the contents of the description, and in order to make the above-mentioned and other purposes, features and advantages of the present disclosure more obvious and easy to understand , the following specific embodiments of the present disclosure are given.

BRIEF DESCRIPTION OF THE DRAWINGS

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for purposes of illustrating preferred embodiments only and are not to be considered limiting of the present disclosure. Also, the same components are denoted by the same reference numerals throughout the drawings. In the attached image:

FIG. 1 shows a flowchart of a method for simulating page turning of an electronic book provided by an embodiment of the present disclosure;

2 shows a flowchart of a method for simulating page turning of an electronic book provided by another embodiment of the present disclosure;

FIG. 3 shows a schematic structural diagram of an electronic device according to another embodiment of the present disclosure;

4 shows a schematic diagram of a page turning state;

Figure 5 shows a schematic diagram of yet another page turning state;

Figure 6 shows a schematic structural diagram of a page-turning book page after adding a shadow element;

Figure 7 shows a schematic diagram of yet another form of shadow element.

Preferred Embodiments of the Disclosure

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art.

Example 1

FIG. 1 shows a flowchart of a method for simulating page turning of an electronic book provided by an embodiment of the present disclosure. As shown in Figure 1, the method includes the following steps:

Step S110: In response to the received page-turning instruction, add a shadow element to the original book page to be turned, to obtain a page-turning book page including the shadow element.

The shadow element may be various types of elements such as shadow pictures, as long as a shadow effect can be achieved. After the shadow element is added, the page not only contains the original page content, but also further includes the added shadow element. For the convenience of description, the original book page after adding the shadow element is called a flip book page.

Step S120: Obtain the displacement change between the page-turning transformation position of the page-turning reference point in the page-turning book page and the page initial position of the page-turning reference point, and determine the page-turning included in the page-turning book page according to the displacement change. area of action.

Since the page turning operation is usually only used to lift a corner of the book page, the page area in the book page that is in a curled state under the influence of the page turning operation is only a partial area of the book page, and the partial area is the page turning action area. The rest of the page area that is not affected by the page turning operation and still remains in a flat state (non-curling state) is a non-page turning action area.

During specific implementation, the page turning instruction is usually triggered by a sliding operation. The page turning reference point in the book page is usually: a position point on the page boundary line adjacent to the triggering position of the page turning instruction. For example, when the trigger position of the page turning instruction is located in the lower right corner area of the book page, the page turning reference point is the page vertex at the lower right corner of the book page. Correspondingly, the initial page position of the page turning reference point is the position of the intersection between the right boundary line and the lower boundary line of the book page. As the page turning operation is performed, the position of the page turning reference point will change, and the changed position is called the page turning change position. Correspondingly, the displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point can reflect the magnitude and direction of the page-turning operation, and then the page of the page-turning book can be determined according to the above-mentioned displacement change. The page-turning effect area contained in .

Step S130: Obtain the page initial position of each page image unit and shadow element contained in the page-turning action area, calculate and display the page-turning transformation position of each page image unit and shadow element included in the page-turning action area, so as to realize the book page Simulation of page turning processing.

Specifically, when a book page is in a curled state, each page image unit included in the page will also be in a curled state. Therefore, it is necessary to calculate each page according to the initial page position of each page image unit included in the page-turning action area. The corresponding page-turning transformation position of the image unit after the curl transformation. Wherein, the page initial position of each page image unit refers to the position of each page image unit on the page of the book before the page turning operation is performed, which can be specifically represented by page coordinates; the page turning transformation position of the page image unit refers to: executing After the page turning operation, each page image unit shows the changed position according to the curling state of the book page. During specific implementation, since the above-mentioned displacement change amount can reflect the degree of curling of the pages of the book, the page-turning transformation position of each page image unit can be obtained based on the displacement change amount. The shadow elements are also processed in a similar manner: first determine the page initial position of each shadow element, and then calculate the page-turning transformation position of each shadow element. It can be seen that by calculating and displaying the page-turning transformation positions of each page image unit and the shadow element, a page curling effect similar to the page-turning effect of a paper book can be rendered, thereby realizing the simulated page-turning processing of the book page. Moreover, it can also imitate the real shadow effect.

In the simulated page-turning method for an electronic book provided by the present disclosure, a shadow element can be added to the original book page to be turned according to the page-turning instruction, so as to obtain a page-turning book page containing the shadow element, and The displacement change between the page-turning transformation position of the reference point and the page initial position of the page-turning reference point determines the page-turning action area included in the page of the page-turning book, so as to draw each page image unit included in the page-turning action area and The page-turning position of the shadow element is changed to realize the simulated page-turning processing of the book page. It can be seen that this method can display the page-turning state of the book presented by the curling process of the book page, give the user a visual experience of page-turning when reading a real paper book, and can also add shadow elements to the page, so that the page is turned The part behind the page has a shadow effect, which further enhances the effect of the simulated page turning.

Embodiment 2

FIG. 2 shows a flowchart of a method for simulating page turning of an electronic book provided by another embodiment of the present disclosure. As shown in Figure 2, the method includes the following steps:

Step S210: In response to the received page-turning instruction, add a shadow element to the original book page to be turned, to obtain a page-turning book page including the shadow element.

The shadow element may be various types of elements such as shadow pictures, as long as a shadow effect can be achieved. After the shadow element is added, the page not only contains the original page content, but also further includes the added shadow element. For the convenience of description, the original book page after adding the shadow element is called a flip book page. For example, shadow elements are semi-transparent image-like elements.

During specific implementation, a page boundary line included in the original book page to be turned is determined, and a shadow element is added to the outer area of the original book page along the page boundary line. Wherein, the inner area of the original book page corresponds to the content part of the book page, and accordingly, the outer area of the original book page corresponds to the area other than the content part of the book page, it can be seen that the outer area of the original book page actually The area that is invisible to the reading user is on the outside of the book page. Since the shadow element is added to the outer area of the original book page, it will not affect the normal reading of the book. In addition, the page boundary line refers to the boundary line located at the edge of the page of the book. Generally, a book page includes four page boundary lines. In this embodiment, shadow elements may be added only to the outer area corresponding to at least one page boundary line, and the specific implementation details are not limited.

In order to ensure that the position of the added shadow element matches the page turning position of the user, when determining the page boundary line contained in the original book page to be turned, and adding the shadow element along the page boundary line in the outer area of the original book page, use the following Implementation method: first, obtain the touch position corresponding to the page turning instruction, and determine the first page boundary line and/or the second page boundary line adjacent to the touch position; then, along the first page boundary line in the original book The first shadow element is added to the outer area of the page; and/or, the second shadow element is added to the outer area of the original book page along the boundary line of the second page. Wherein, the boundary line of the first page may be perpendicular to the boundary line of the second page. For example, FIG. 6 shows a schematic diagram of the structure of a page of a page-turning book after adding a shadow element. As shown in FIG. 6 , the original book page 60 before adding the shadow element has four page boundary lines. It is assumed that the touch position corresponding to the page turning command is the point Y in the figure, and the two adjacent touch position Y The page boundary lines are respectively a first page boundary line 61 and a second page boundary line 62 that are perpendicular to each other. Correspondingly, a first shadow element 63 is added to the outer area of the original book page along the first page boundary line 61 , and a second shadow element 64 is added to the outer area of the original book page along the second page boundary line 62 . It can be seen that the flipped book page after adding the shadow element includes: the original book page 60 , the first shadow element 63 and the second shadow element 64 . It can be seen that by adding a shadow element to the page boundary line corresponding to the page turning instruction, the shadow element can be turned and curled together with the page in the subsequent page turning process, thereby presenting a natural shadow effect.

Preferably, considering that only a part of the book page is involved in the curling transformation during the page turning process, in order to save system processing resources, the range of adding shadow elements can be set according to the page turning action area included in the book page. Specifically, adding a first shadow element to an outer area of the original book page along a first partial line segment included in the first page boundary line; and/or adding a first shadow element along the second partial line segment included in the second page boundary line on the original book page A second shadow element is added to the outer area of the ; wherein the length of the first partial line segment and/or the line segment of the second partial line segment is determined according to the sliding displacement amount of the sliding operation corresponding to the page turning instruction.

Step S220: Obtain the displacement change between the page-turning transformation position of the page-turning reference point in the page-turning book page and the page initial position of the page-turning reference point.

The page turning reference point in the book page is usually: a position point on the page boundary line adjacent to the triggering position of the page turning instruction. For example, when the trigger position of the page turning instruction is located in the lower right corner area of the book page, the page turning reference point is the page vertex at the lower right corner of the book page. Correspondingly, the initial page position of the page turning reference point is the position of the intersection between the right boundary line and the lower boundary line of the book page. As the page turning operation is performed, the position of the page turning reference point will change, and the changed position is called the page turning change position. Correspondingly, the amount of displacement change between the page turning transformation position of the page turning reference point relative to the page initial position of the page turning reference point can reflect the magnitude and direction of the page turning operation.

Step S230: Determine the page-turning action area included in the page of the page-turning book according to the displacement change.

Since the page turning operation is usually only used to lift a corner of the book page, the page area in the book page that is in a curled state under the influence of the page turning operation is only a partial area of the book page, and the partial area is the page turning action area. The rest of the page area that is not affected by the page turning operation and still remains in a flat state (non-curling state) is a non-page turning action area.

Step S240: Obtain the page initial positions of each page image unit and shadow element contained in the page-turning action area, and calculate and display the page-turning transformation positions of each page image unit and shadow element included in the page-turning action area, so as to realize the book page Simulation of page turning processing.

Specifically, when a book page is in a curled state, each page image unit included in the page will also be in a curled state. Therefore, it is necessary to calculate each page according to the initial page position of each page image unit included in the page-turning action area. The corresponding page-turning transformation position of the image unit after the curl transformation. Wherein, the page initial position of each page image unit refers to the position of each page image unit on the page of the book before the page turning operation is performed, which can be specifically represented by page coordinates; the page turning transformation position of the page image unit refers to: executing After the page turning operation, each page image unit shows the changed position according to the curling state of the book page. During specific implementation, since the above-mentioned displacement change amount can reflect the degree of curling of the pages of the book, the page-turning transformation position of each page image unit can be obtained based on the displacement change amount. The shadow elements are also processed in a similar manner: first determine the page initial position of each shadow element, and then calculate the page-turning transformation position of each shadow element. It can be seen that by calculating and displaying the page-turning transformation positions of each page image unit and the shadow element, a page curling effect similar to the page-turning effect of a paper book can be rendered, thereby realizing the simulated page-turning processing of the book page. Moreover, it can also imitate the real shadow effect.

Next, the specific implementation details of the above-mentioned simulated page turning method are described in detail through a specific example. The example includes the following steps:

Step 1: In response to the received page-turning instruction, add a shadow element to the original book page to be turned, to obtain a page-turning book page containing the shadow element; obtain the page-turning transformation position of the page-turning reference point in the page-turning book page The amount of displacement change between the initial position of the page relative to the page turning reference point.

Specifically, the page turning instruction in this embodiment is a sliding page turning command. The page turning reference point in the book page is usually: a position point on the page boundary line adjacent to the triggering position of the page turning instruction. FIG. 4 shows a schematic diagram of a page turning state. As shown in FIG. 4 , the trigger position of the page turning instruction is located in the lower right corner area of the book page. Correspondingly, the page turning reference point in the book page is the lower right corner of the book page. The vertex of the page. The initial page position of the page turning reference point is the right boundary line (corresponding to the second page boundary line 64 in FIG. 6 ) and the lower boundary line (corresponding to the first page boundary line 63 in FIG. 6 ) of the book page. The position of the intersection point between them is point F in Figure 4.

As the page turning operation is performed, the position of the page turning reference point will change, and the changed position is called the page turning change position. For example, point A in FIG. 4 corresponds to the page-turning transition position of the page-turning reference point. Correspondingly, the amount of displacement change between the page turning transformation position of the page turning reference point relative to the page initial position of the page turning reference point can reflect the magnitude and direction of the page turning operation. The displacement change amount can be determined by the length and slope of the line segment AF.

Specifically, when obtaining the displacement change between the page-turning transformation position of the page-turning reference point in the book page and the page initial position of the page-turning reference point, the following method is used: first, obtain the information of the sliding page-turning instruction. Swipe direction and/or swipe length. Wherein, the sliding direction and/or the sliding length of the sliding page turning instruction is used to represent the sliding displacement amount of the sliding page turning command, and the sliding displacement amount depends on factors such as the duration of the sliding operation and the sliding speed. Then, according to the sliding direction and/or the sliding length, the displacement direction and/or the displacement length of the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is determined. Wherein, the displacement direction of the page-turning transformation position of the page-turning reference point relative to the initial position of the page of the page-turning reference point matches the sliding direction of the sliding-type page-turning instruction, and the page-turning transformation position of the page-turning reference point is relative to the page turning direction. There is a preset proportional relationship between the displacement length of the initial page position of the reference point and the sliding length of the sliding page turning instruction.

Wherein, in this step, a shadow element can be added to the original book page. When adding, the first shadow element can be added directly along the above-mentioned first page boundary line in the outer area of the original book page; and along the second page boundary line Add a second shadow element to the outer area of the original book page. Alternatively, the size of the shadow element may be further adjusted according to the displacement change between the page-turning transformation position of the page-turning reference point in the page-turning book page and the page initial position of the page-turning reference point. For example, a first shadow element is added in the outer area of the original book page along the first partial line segment included in the first page boundary line; Two shaded elements, the line lengths of the first partial line segment and the second partial line segment are determined according to the displacement change between the page-turning transformation position of the page-turning reference point in the page-turning book page relative to the page initial position of the page-turning reference point.

Step 2: Calculate the page curling radius corresponding to the page turning instruction.

Since the displacement change between the page-turning transformation position of the page-turning reference point relative to the initial page position of the page-turning reference point can reflect the magnitude and direction of the page-turning operation, the page curl corresponding to the page-turning instruction can be calculated. radius. The page curling radius refers to the radius of the cylindrical surface formed by the curled book pages when the book pages are in a curled state with the page turning operation. The page curl radius is used to indicate how curled the book pages are.

During specific implementation, the curling radius of the page is mainly calculated according to the displacement change amount and the circle radius formula. Wherein, the inventor found in the process of realizing the present disclosure that when the displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is too small, the page-turning effect will be difficult to detect; However, when the displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is too large, the page turning amplitude is too large and the normal reading of the user is affected. In order to solve the above problem, in this embodiment, a lower threshold and an upper threshold are preset. If the displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is less than the preset lower limit If the threshold is set, the page curling radius corresponding to the page turning instruction is determined to be a preset lower limit value, where the preset lower limit value is a preset minimum radius. If the displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is greater than the preset upper limit threshold, the page curling radius corresponding to the page turning instruction is determined to be the preset upper limit value , wherein the preset upper limit value is a preset maximum radius. If the displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is between the preset lower threshold and the preset upper threshold, the calculation is performed according to the displacement change and the circle radius formula. Page curl radius. Wherein, the circle radius formula is used to define the relative relationship between the displacement change between the page-turning transformation position of the page-turning reference point and the page initial position of the page-turning reference point and the curling radius of the page. Usually, the ratio between the displacement change between the page turning transformation position of the page turning reference point and the page initial position of the page turning reference point and the page curling radius has a preset law, for example, may be a preset constant.

Step 3: Determine the page-turning action area included in the book page according to the page curling radius, the page initial position of the page-turning reference point, and the page-turning transformation position of the page-turning reference point.

Since the page turning operation is usually only used to lift a corner of the book page, the page area in the book page that is in a curled state under the influence of the page turning operation is only a partial area of the book page, and the partial area is the page turning action area. The rest of the page area that is not affected by the page turning operation and still remains in a flat state (non-curling state) is a non-page turning action area. In order to simulate a real page-turning curl state, it is necessary to first determine the above-mentioned page-turning action area, so as to perform curl transformation processing for the page-turning action area in subsequent steps.

During specific implementation, when determining the page-turning action area included in the book page according to the page curl radius, the page initial position of the page-turning reference point, and the page-turning transformation position of the page-turning reference point, the following methods are used: The page initial position of the page turning reference point and the reference line of the page turning change position of the page turning reference point, determine the target point located on the reference line according to the page curl radius; then, according to the target point passing through the target point and perpendicular to the reference line The boundary line defines the page-turning action area contained in the book page.

The reference line passing through the initial page position of the page turning reference point and the page turning change position of the page turning reference point is the straight line defined by the point A and the point F in FIG. 4 . When determining the target point on the reference straight line according to the page curling radius, the specific position of the target point on the reference straight line is mainly determined according to the size of the page curling radius. Among them, the target point in Figure 4 is point P. Correspondingly, the boundary line passing through the target point and perpendicular to the reference line is the line defined by point C and point J in FIG. 4 . The boundary line is used to divide the page-turning action area and the non-page-turning action area included in the book page. For example, the lower-left area of the boundary line corresponds to the page-turning area, and the image units contained in this part of the area will undergo curl transformation; while the upper-right area of the boundary line corresponds to the non-page-turning area, and the images contained in this part area will undergo curl transformation. Cells do not undergo curl transformation. It can be seen that a boundary line passing through the target point and perpendicular to the reference line can be drawn through the target point on the reference line defined by the length of the page curl radius, and the page turning action area can be quickly determined through the boundary line. Wherein, as shown in FIG. 4 , the first intersection point between the boundary line and the first page boundary line is point C, and the second intersection point between the boundary line and the second page boundary line is point J, passing through point C and point J can more accurately define the page turning action area.

Among them, the target point shown in FIG. 4 is located between the page initial position of the page turning reference point and the page turning transformation position of the page turning reference point. In fact, when the page curling radius is small, it may also be the turning of the page turning reference point The page change position is between the page initial position of the page turning reference point and the target point. In conclusion, the present disclosure does not limit the specific position of the target point on the reference line.

For example, in the first case, the page curling radius is greater than the preset value, indicating that the sliding displacement corresponding to the page turning command at this time is large, and the target point is between the initial page position of the page turning reference point and the page turning reference between the page-turning positions of the points. As shown in FIG. 4, the target point P is located between the point A and the point F. Correspondingly, when determining the page-turning effect area included in the book page, the first sub-area included in the page-turning effect area without curl transformation and the second sub area with curl transformation are determined according to the target point. Among them, the first sub-area without curling transformation corresponds to the back area of the book page. For example, the area composed of points A, B, and K in FIG. 4 is the first sub-area, and this area is used to display the page-turned The area on the back of the book that has not undergone a curl transformation. The second sub-region where the curl transformation occurs includes the front and back regions of the book page.

Specifically, when determining, according to the target point, the first sub-area that does not undergo curl transformation and the second sub-region that undergoes curl transformation and included in the page-turning action region, the following methods are used:

First, determine the target mapping point located on the reference line and corresponding to the target point; wherein, the interval between the target mapping point and the page initial position of the page turning reference point is the difference between the target point and the page turning change position of the page turning reference point interval matching. Specifically, the target mapping point can be determined by: firstly drawing a reference line segment formed by the page initial position of the page-turning reference point and the page-turning transformation position of the page-turning reference point, that is, the line segment AF in FIG. 4 , and then determining The midpoint of the line segment AF is the point G, and accordingly, the distances from the target mapping point O and the target point P to the midpoint G are equal. It can be seen that the interval between the target mapping point and the page initial position of the page turning reference point (that is, the length of the line segment OF) and the interval between the target point and the page turning change position of the page turning reference point (that is, the length of the line segment AP) )equal.

Then, according to the boundary mapping line passing through the target mapping point and perpendicular to the reference line, determine the first critical point (ie point B1) located on the boundary line of the first page of the book page and the second critical point located on the boundary line of the second page of the book page Critical point (ie point K1); wherein, the first page boundary line is perpendicular to the second page boundary line, and the page initial position of the page turning reference point is at the intersection of the first page boundary line and the second page boundary line. The boundary mapping straight line passing through the target mapping point and perpendicular to the reference straight line is the straight line determined by the point B1 and the point K1 in FIG. 4 .

Finally, a triangular area formed by the first critical point, the second critical point and the initial position of the page of the page turning reference point is determined, and the first sub-region that does not undergo curl transformation is determined according to the triangular area and the mapping area corresponding to the triangular area region and the second subregion where the warp transformation takes place. Wherein, the triangular area formed by the first critical point, the second critical point and the initial position of the page of the page turning reference point is the area formed by the points B1, K1 and F. Correspondingly, the mapping area corresponding to the triangular area is the area formed by points B, K and A. The point B corresponds to the page-turning transformation position of the point B1 after the curling transformation, and the point K corresponds to the page-turning transformation position of the point K1 after the curling transformation. It can be seen that the mapping area is the corresponding texture area after being flipped by the triangle area, and the mapping area corresponds to the back of the triangle area.

Specifically, when determining the first sub-region that does not undergo curl transformation and the second sub-region that undergoes curl transformation according to the triangle region and the mapping region corresponding to the triangle region, first, the triangle region and its corresponding mapping region are determined. It is determined as the first sub-region where no curling transformation has occurred, and the remaining regions correspond to the second sub-region where curling transformation has occurred.

Step 4: Obtain the initial page position of each image unit included in the page-turning action area, and calculate and display the page-turning transformation position of each image unit in combination with the page curl radius, so as to realize the simulated page-turning process of the book page.

Specifically, when the page of the book is in a curled state, each image unit included in the page will also be in a curled state. Therefore, it is necessary to calculate the initial position of each image unit included in the page turning action area according to the page initial position of each image unit. The corresponding page transformation position after curl transformation. Wherein, the initial page position of each image unit refers to the position of each image unit on the page of the book before performing the page turning operation, which can be specifically represented by page coordinates; the page turning transformation position of the image unit refers to: performing the page turning operation Afterwards, each image unit presents a changed position according to the curled state of the book page. During specific implementation, since the page curl radius can reflect the curl degree of the book page, the page-turning transformation position of each image unit can be calculated based on the page curl radius. It can be seen that, by calculating and displaying the page-turning transformation positions of each image unit, a page curling effect similar to that presented when a paper book is turned can be rendered, thereby realizing the simulated page-turning processing of the book pages.

In the specific implementation, the initial page position of each image unit included in the page-turning action area is obtained, and when the page-turning transformation position of each image unit is calculated and displayed in combination with the page curl radius, for the first sub-region in FIG. 4, according to the mapping relationship Determine the page-turning transformation position of each image unit in the first sub-region; for the second sub-region, determine the page-turning transformation position of each image unit in the second sub-region according to the cylinder equation determined by the page curl radius.

Wherein, each image unit included in the page-turning action area is also called a page image unit, which refers to a page image constituent element of a book page, for example, an image unit may be an image pixel point. According to the initial page position of each image pixel in the original book page, the page-turning transformation position corresponding to the image pixel after the curling transformation can be calculated in combination with the page curling radius.

Since the above-mentioned first sub-area does not undergo curl transformation, only the triangular area formed by the three points of B1K1F is mapped to the mapping area formed by the three points of BKA through the mapping method. Therefore, according to the mapping relationship, determine the The page-turning transformation position of each image unit of . In addition, considering that the first sub-area corresponds to the back area of the book page, therefore, it is necessary to first acquire the mapped image units in the back area corresponding to each image unit in the first sub-area, and then map each image unit to the back area. The mapped image units in the back area of are mapped to the corresponding page-turning transformation positions. The back area corresponding to each image unit refers to an area located at the same coordinate position as the image unit in the back page corresponding to the currently displayed book page. For example, for an image unit located in the lower right corner area of page 5, the corresponding mapped image unit in the back area is the image unit located at the lower left corner of page 6. That is, the mapped image unit in the back area corresponding to a certain image unit refers to the image unit at the same position on the back of the image unit obtained by turning the page over.

Different from the first sub-region, each image pixel in the above-mentioned second sub-region undergoes curl transformation. Therefore, for each image pixel in the second sub-region, the second sub-region is determined according to the cylinder equation determined by the page curling radius. The page-turning transformation position of each image unit in the sub-region. For example, the point E and the point H in FIG. 4 are auxiliary calculation points involved in the calculation process, and the line segment EH is the vertical bisector of the line segment AF. In addition, the point D1 in FIG. 4 is the midpoint of the line segment CB1, and the point I1 is the midpoint of the line segment JK1. Correspondingly, the point D is the page-turning transformation position corresponding to the point D1, and the point I is the page-turning transformation position corresponding to the point I1. The point M corresponds to the page turning change position corresponding to the midpoint of the line segment B1D1, and the point N corresponds to the page turning change position corresponding to the midpoint of the line segment K1I1. In specific implementation, for a specific image pixel, it is first determined that the image pixel is located in the first sub-region or the second sub-region, and if it is located in the first sub-region, it is determined according to the mapping method that corresponds to the initial position of the image pixel on the page If it is located in the second sub-region, substitute the initial page position of the image pixel into the cylinder equation determined by the page curl radius, and determine the page-turning transformation position corresponding to the image pixel according to the calculation result. For example, the position of point D is obtained by substituting the initial position of the page of point D1 into the cylinder equation.

In addition, as mentioned above, the second sub-area includes both the front area and the back area of the original book page. Therefore, in the above process, it is necessary to first distinguish the first sub-area corresponding to the front area contained in the second sub-area. Two front sub-areas, and a second back sub-area corresponding to the back area. In order to divide the above-mentioned second front sub-region and second back sub-region, it needs to be divided according to point D1 and point I1 in FIG. 4 .

Specifically, the above-mentioned second front sub-region and second back sub-region are divided in the following manner: First, draw a boundary line that passes through the target point P and is perpendicular to the reference line, and determines the distance between the boundary line and the first page boundary line. the first intersection point C and the second intersection point J of the boundary line and the second page boundary line; then, determine the first midpoint D1 between the first intersection point C and the first critical point B1, and the second intersection point J and the second intersection point The second midpoint I1 between the critical points K1 is determined according to the first midpoint D1 and the second midpoint I1. Two back sub-regions (regions formed by points D1, B1, K1, I1). Correspondingly, for each image pixel point in the second back sub-area, it is necessary to first acquire the mapped image units in the back area corresponding to each image unit in the second back sub-area, and then map the image units corresponding to each image unit. The mapped image unit in the back area is mapped to the corresponding page turning position.

FIG. 4 corresponds to the case where the page curling radius is larger, and FIG. 5 further shows a schematic diagram of the page curling effect when the page curling radius is smaller. As shown in FIG. 5 , if the page curling radius is not greater than the preset value, the page-turning transformation position of the page-turning reference point is between the page initial position of the page-turning reference point and the target point. For example, the target point P in FIG. 5 is located on the extension line of the line segment AF. Of course, it is also possible that the target point P and the page-turning change position A of the page-turning reference point coincide with each other. However, whether the target point P is located on the extension line of the line segment AF, or the target point P and the page-turning transformation position A of the page-turning reference point coincide with each other, the page-turning action area cannot be divided into the above-mentioned first sub-area and The second sub-area, but only contains an integral area. At this time, when the initial page position of each image unit included in the page-turning action area is obtained, and the page-turning transformation position of each image unit is calculated and displayed in combination with the page curling radius, the page-turning is determined directly according to the cylindrical equation determined by the page curling radius. The page transform position of each image unit in the active area.

In addition, as shown in FIG. 5 , when the target point P is located on the extension line of the line segment AF or when the target point P and the page-turning transformation position A of the page-turning reference point coincide with each other, the page-turning action area can still be divided into pages corresponding to the pages of the book. The front active area of the front content and the back active area corresponding to the back content of the book page. It can be seen that, regardless of the position of the target point, the page turning action area can be divided into a front action area corresponding to the front content of the book page (for example, the second front sub-region in FIG. 4 ) and a back content corresponding to the book page (for example, the triangular area and the second back sub-area in FIG. 4 can be collectively referred to as the back active area). Among them, for the back action area corresponding to the back content of the book page, it is necessary to obtain the mapped image units in the back area corresponding to each image unit in the back action area, and then, map the back area corresponding to each image unit in the back area. The mapped image unit is mapped to the corresponding page transform position.

In addition, as mentioned above, the first shadow element may be added in the outer area of the original book page along the first partial line segment included in the first page boundary line, and the second shadow element may be included along the second page boundary line The second partial line segment is added in the outer area of the original book page. In order to facilitate the determination of the length and position of the partial line segment, in a specific example, the first partial line segment included in the first page boundary line is defined by the first intersection point C between the above-mentioned boundary line and the first page boundary line and The page initial position F of the page turning reference point is defined; the second partial line segment included in the second page boundary line is defined by the second intersection J of the above-mentioned boundary line and the second page boundary line and the page initial position of the page turning reference point Position F is limited. Figure 7 shows a schematic diagram of another form of shadow element. As shown in FIG. 7 , the first page boundary line includes a first partial line segment 71 , and the second page boundary line includes a second partial line segment 72 . Correspondingly, a first shadow element 73 is added along the first partial line segment 71 in the outer region of the original book page, and a second shadow element 74 is added along the second partial line segment 72 in the outer region of the original book page.

In addition, it should also be noted that this embodiment does not limit the timing of adding shadow elements, and shadow elements may also be relative to the page of the page-turning reference point at the page-turning transformation position of the page-turning reference point obtained in the page of the page-turning book. The displacement change between the initial positions is added after determining the page-turning action area included in the page of the page-turning book according to the displacement change. It can be seen that the execution sequence of the above steps can be flexibly adjusted. Alternatively, a shadow element can also be added first, and after the displacement change between the page-turning transformation position of the page-turning reference point in the page-turning book page and the page initial position of the page-turning reference point is obtained, Displacement delta adjusts the size and position of shadow elements.

It can be seen that, before calculating the page-turning transformation position of each page image unit in this embodiment, a shadow element is added to the outside of the original book page in advance, so it can be calculated according to the initial page position of each pixel in the shadow element at the same time. The page transform position of each pixel in the shadow element. This method can make the added shadow effect more realistic, and there is no need to additionally perform the operation of adding shadow after calculating the page-turning transformation position of each page image unit, so that the shadow element and the page image unit undergo curl transformation together.

In addition, it should also be noted that, in this embodiment, the sliding page turning instruction is usually triggered continuously. For example, the user slides in a preset direction for a certain period of time to trigger the sliding page turning command. Correspondingly, in the triggering process of the sliding page-turning instruction, the current sliding direction and sliding length are continuously detected, and the page-turning transformation position of the page-turning reference point is dynamically calculated according to the current real-time detection result, and the page-turning transformation position of the page-turning reference point is dynamically calculated according to the calculated turning The page turning transformation position of the page reference point calculates the page curl radius and the page turning transformation position of each image unit in the page turning action area. That is to say, in the process of continuous page turning, the area range of the page turning action area and the corresponding page curling radius are dynamically changed. For example, in the initial stage of page turning, the page may be in the state shown in Figure 5, and as the page turning instruction continues to run, the page may be in the state shown in Figure 4. Therefore, in this embodiment, it is necessary to dynamically perform multiple times Computational process in order to present the page state corresponding to each page turning stage in real time.

From the above, it can be seen that through the simulated page-turning method in this embodiment, the pages of the book can be naturally curled with the page-turning operation. In addition, during the process of page turning and curling, each image unit on the curled page is also transformed, thereby presenting a real deformation state. For example, the words "Venerable" in Figure 4 show the effect of curling. It can be seen that this embodiment can simulate the page-turning state of a real paper book, so that the content displayed on the page of the e-book during the page-turning process is consistent with the content corresponding to the page-turning process of the paper book. In addition, by adding shadow elements in advance, the operation of adding shadows to the page and the curling transformation operation are completed at the same time, and there is no need to perform shadow transformation processing twice after the page is curled, which not only improves the processing efficiency, but also achieves a real simulated page turning effect. .

In addition, those skilled in the art can also make various changes and modifications to the above-mentioned embodiments: Specifically, in step S210, when a page-turning instruction triggered for a book page containing preset picture elements is detected, the picture drawing interface is called. Perform the next steps. Wherein, the book page containing preset picture elements means that the content of the page includes dynamic pictures or picture elements for linking to video resources. For example, dynamic video resources are inserted into e-books by means of image links, etc., so that users can obtain information in the form of pictures or videos during the process of reading e-books, thereby improving book reading efficiency. Specifically, the page turning instruction is usually triggered by a sliding operation. Correspondingly, when a page-turning instruction triggered by a sliding operation is detected, a picture drawing interface is called to implement a subsequent page-turning drawing operation. The picture drawing interface refers to an interface dedicated to realizing the picture drawing function. For example, in the Android system, it can be implemented through an interface with a drawing function provided by the Android system. For another example, in the ios system, it can be implemented through a custom developed interface with a drawing function. Since the interface logic of the picture drawing interface can be flexibly adjusted according to actual business requirements, it is especially suitable for page-turning and drawing processing of complex book pages containing pictures. Among them, in the process of implementing the present disclosure, the inventor found that drawing processing is mostly implemented by OpenGL in traditional methods. However, the OpenGL drawing method has the following limitations: it cannot be applied to the processing of book pages containing pictures. That is to say, the OpenGL drawing method can only be applied to the drawing processing of regular book pages containing text, and cannot be applied when the book pages contain pictures or picture links used to link to video resources. Therefore, in order to solve the above problem, when a page-turning instruction is detected, the page description information of the book page corresponding to the page-turning command is further obtained, and whether the book page contains a preset picture is judged by the page description information of the book page Element, if so, call the above picture drawing interface to implement page turning drawing processing; if not, you can flexibly choose whether to process by conventional OpenGL drawing method. The preset picture element is used to display dynamic picture resources, that is, video resources or motion picture resources. By inserting preset picture elements into the page, video content can be played during the e-book reading process, thereby improving the efficiency of information acquisition by users. Specifically, when judging whether the book page contains a preset picture element according to the page description information of the book page, it can be determined whether the page source code contains a source code matching the preset picture element by parsing the page source code corresponding to the book page. way to achieve. Correspondingly, in step S220 and step S230, the page-turning action area corresponding to the page-turning instruction included in the book page is determined through the picture drawing interface. Specifically, when determining the page-turning action area, calculation processing is required. In order to reduce the calculation amount, in this embodiment, the number of image units to be calculated is reduced by sampling, thereby improving the calculation efficiency. Specifically, the image units (ie page image units) contained in the book pages are sampled through the picture drawing interface to obtain the sampling units contained in the book pages; according to the sampling units contained in the book pages, the The page-turning action area corresponding to the page command. Wherein, the image unit may be image information in the form of image pixels and the like, and sampling is used to reduce the number of image units to reduce the amount of calculation. In the specific implementation, the page area of the book page is divided into a plurality of area grids through the picture drawing interface, and sampling processing is performed on the image units contained in each area grid, respectively, to obtain a set of sampling units corresponding to each area grid. ; Correspondingly, according to the set of sampling units corresponding to each area grid, determine the area grids belonging to the page turning action area. For example, the size of each area grid is preset, and accordingly, each area grid is divided according to the corresponding size, so that the page area of the entire book page is divided into a plurality of area grids arranged in sequence. Specifically, when the sampling processing is performed for each area grid, several image units in the area grid may be extracted according to a preset sampling ratio, wherein the extracted image units are also called sampling units. The image units together constitute a set of sampling units corresponding to the area grid. Correspondingly, in the above step S240, the page-turning transformation positions of each page image unit and the shadow element contained in the page-turning action area are calculated through the picture drawing interface, and the page-turning transformation positions of each page image unit and the shadow element obtained by calculation are calculated. Rendering to achieve simulated page-turning of book pages. During specific implementation, the page initial position of each image unit included in the sampling unit set corresponding to the area grid belonging to the page turning action area is obtained through the picture drawing interface; according to the page initial position of each image unit included in the sampling unit set , calculate and display the page-turning transformation position of each image unit included in the sampling unit set, so as to realize the simulated page-turning processing of book pages. It can be seen that, through the sampling processing in this embodiment, it is not necessary to perform operations on all the image units in the area grid one by one, but only need to perform operations on each image unit in the sampling unit set included in the area grid. Computation. In addition, for other image units that are not included in the sampling unit set, it can be filled by an edge drawing algorithm, a smoothing algorithm, or a shrinking algorithm.

Embodiment 3

Embodiments of the present application provide a non-volatile computer-readable storage medium, where the non-volatile computer-readable storage medium stores at least one executable instruction, and the computer-executable instruction can execute the electronic functions in any of the foregoing method embodiments. Book simulation page turning method.

Executable instructions can specifically be used to cause the processor to perform the following operations:

In response to the received page-turning instruction, a shadow element is added to the original book page to be turned to obtain a page-turning book page containing the shadow element;

Obtaining the displacement change between the page-turning transformation position of the page-turning reference point in the page-turning book page and the page initial position of the page-turning reference point, and determining the page-turning action area included in the page of the page-turning book according to the displacement change;

Obtain the page initial position of each page image unit and shadow element included in the page-turning action area, calculate and display the page-turning transformation position of each page image unit and shadow element included in the page-turning action area, so as to realize the simulated page turning of the book. page processing.

In an optional implementation manner, adding a shadow element to the original book page to be turned includes:

Determine the page boundary line included in the original book page to be turned, and add shadow elements along the page boundary line in the outer area of the original book page.

In an optional implementation manner, determining a page boundary line included in the original book page to be turned, and adding a shadow element to the outer area of the original book page along the page boundary line includes:

Acquire the touch position corresponding to the page turning instruction, and determine the first page boundary line and/or the second page boundary line adjacent to the touch position;

A first shadow element is added in the outer area of the original book page along the first page boundary line; and/or, the second shadow element is added in the outer area of the original book page along the second page boundary line.

In an optional implementation manner, the boundary line of the first page and the boundary line of the second page are perpendicular to each other; and the shadow element is a translucent picture element.

In an optional implementation manner, a first shadow element is added to the outer area of the original book page along the first page boundary line; and/or, a second shadow element is added to the outer area of the original book page along the second page boundary line Elements include:

adding a first shadow element along the first partial line segment contained in the first page boundary line in the outer region of the original book page; and/or along the second partial line segment included in the second page boundary line in the outer region of the original book page Add a second shadow element;

Wherein, the line segment length of the first partial line segment and/or the second partial line segment is determined according to the sliding displacement amount of the sliding operation corresponding to the page turning instruction.

In an optional implementation manner, determining the page-turning action area included in the page of the page-turning book according to the displacement change includes:

Calculate the page curling radius corresponding to the page turning instruction according to the displacement change;

According to the page curling radius, the page initial position of the page turning reference point, and the page turning transformation position of the page turning reference point, the page turning action area included in the book page is determined.

In an optional implementation manner, according to the page curl radius, the page initial position of the page turning reference point, and the page turning transformation position of the page turning reference point, determining the page turning action area included in the book page includes:

Determine the initial position of the page passing through the page turning reference point and the reference line of the page turning transformation position of the page turning reference point, and determine the target point located on the reference line according to the curling radius of the page;

The page turning action area included in the book page is determined according to the boundary line passing through the target point and perpendicular to the reference line.

In an optional implementation manner, calculating the page curling radius corresponding to the page turning instruction includes:

If the displacement change between the page-turning transformation position of the page-turning reference point and the page initial position of the page-turning reference point is less than the preset lower limit threshold, the page curling radius corresponding to the page turning instruction is determined to be the preset lower limit value ;

If the displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is greater than the preset upper limit threshold, the page curling radius corresponding to the page turning instruction is determined to be the preset upper limit value ;

If the displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is between the preset lower threshold and the preset upper threshold, the calculation is performed according to the displacement change and the circle radius formula. Page curl radius.

Embodiment 4

FIG. 3 shows a schematic structural diagram of an electronic device according to another embodiment of the present disclosure. The specific embodiment of the present disclosure does not limit the specific implementation of the electronic device.

As shown in FIG. 3 , the electronic device may include: a processor (processor) 302 , a communication interface (Communications Interface) 304 , a memory (memory) 306 , and a communication bus 308 .

The processor 302 , the communication interface 304 , and the memory 306 communicate with each other through the communication bus 308 . The communication interface 304 is used for communicating with network elements of other devices such as clients or other servers. The processor 302 is configured to execute the program 310, and specifically, may execute the relevant steps in the foregoing embodiments of the method for simulating page turning of an electronic book.

Specifically, the program 310 may include program code including computer operation instructions.

The processor 302 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present disclosure. The one or more processors included in the electronic device may be the same type of processors, such as one or more CPUs; or may be different types of processors, such as one or more CPUs and one or more ASICs.

The memory 306 is used to store the program 310 . Memory 306 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk memory.

The program 310 can specifically be used to cause the processor 302 to perform the following operations:

In response to the page-turning instruction received, a shadow element is added for the original book page to be turned to obtain a page-turning book page that includes the shadow element;

Obtaining the displacement change between the page-turning transformation position of the page-turning reference point in the page-turning book page and the page initial position of the page-turning reference point, and determining the page-turning action area included in the page of the page-turning book according to the displacement change;

Obtain the page initial position of each page image unit and shadow element contained in the page-turning action area, calculate and display the page-turning transformation position of each page image unit and shadow element included in the page-turning action area, so as to realize the simulated page turning of the book. page processing.

In an optional implementation manner, adding a shadow element to the original book page to be turned includes:

Determine the page boundary line included in the original book page to be turned, and add shadow elements along the page boundary line in the outer area of the original book page.

In an optional implementation manner, determining a page boundary line included in the original book page to be turned, and adding a shadow element to the outer area of the original book page along the page boundary line includes:

Acquire the touch position corresponding to the page turning instruction, and determine the first page boundary line and/or the second page boundary line adjacent to the touch position;

A first shadow element is added in the outer area of the original book page along the first page boundary line; and/or, the second shadow element is added in the outer area of the original book page along the second page boundary line.

In an optional implementation manner, the boundary line of the first page and the boundary line of the second page are perpendicular to each other; and the shadow element is a translucent picture element.

In an optional implementation manner, a first shadow element is added to the outer area of the original book page along the first page boundary line; and/or, a second shadow element is added to the outer area of the original book page along the second page boundary line Elements include:

adding a first shadow element along the first partial line segment contained in the first page boundary line in the outer area of the original book page; and/or along the second partial line segment contained in the second page boundary line in the outer area of the original book page Add a second shadow element;

Wherein, the line segment length of the first partial line segment and/or the second partial line segment is determined according to the sliding displacement amount of the sliding operation corresponding to the page turning instruction.

In an optional implementation manner, determining the page-turning action area included in the page of the page-turning book according to the displacement change includes:

Calculate the page curling radius corresponding to the page turning instruction according to the displacement change;

According to the page curling radius, the page initial position of the page turning reference point, and the page turning transformation position of the page turning reference point, the page turning action area included in the book page is determined.

In an optional implementation manner, according to the page curl radius, the page initial position of the page turning reference point, and the page turning transformation position of the page turning reference point, determining the page turning action area included in the book page includes:

Determine the initial position of the page passing through the page turning reference point and the reference line of the page turning transformation position of the page turning reference point, and determine the target point located on the reference line according to the curling radius of the page;

The page turning action area included in the book page is determined according to the boundary line passing through the target point and perpendicular to the reference line.

In an optional implementation manner, calculating the page curling radius corresponding to the page turning instruction includes:

If the displacement change between the page-turning transformation position of the page-turning reference point and the page initial position of the page-turning reference point is less than the preset lower limit threshold, the page curling radius corresponding to the page turning instruction is determined to be the preset lower limit value ;

If the displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is greater than the preset upper limit threshold, the page curling radius corresponding to the page turning instruction is determined to be the preset upper limit value ;

If the displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is between the preset lower threshold and the preset upper threshold, the calculation is performed according to the displacement change and the circle radius formula. Page curl radius.

The algorithms and displays provided herein are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used with teaching based on this. The structure required to construct such a system is apparent from the above description. Furthermore, this disclosure is not directed to any particular programming language. It is to be understood that various programming languages may be used to implement the disclosures described herein and that the descriptions of specific languages above are intended to disclose the best mode of the disclosure.

In the description provided herein, numerous specific details are set forth. It will be understood, however, that embodiments of the present disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it will be appreciated that in the above description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together into a single embodiment, figure, or its description. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the Detailed Description are hereby expressly incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment of the present disclosure.

Those skilled in the art will understand that the modules in the device in the embodiment can be adaptively changed and arranged in one or more devices different from the embodiment. The modules or units or components in the embodiments may be combined into one module or unit or component, and further they may be divided into multiple sub-modules or sub-units or sub-assemblies. All features disclosed in this specification (including accompanying claims, abstract and drawings) and any method so disclosed may be employed in any combination unless at least some of such features and/or procedures or elements are mutually exclusive. All processes or units of equipment are combined. Each feature disclosed in this specification (including accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, it will be understood by those skilled in the art that although some of the embodiments herein include certain features, but not others, included in other embodiments, that combinations of features of the different embodiments are intended to be within the scope of the present disclosure And form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.

It should be noted that the above-described embodiments illustrate rather than limit the disclosure, and that alternative embodiments may be devised by those skilled in the art without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present disclosure may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, and third, etc. do not denote any order. These words can be interpreted as names.

Claims (18)

1. A method for simulating page turning of an electronic book, comprising:

   In response to the received page-turning instruction, a shadow element is added to the original book page to be turned to obtain a page-turning book page containing the shadow element;

   Obtaining the displacement change between the page-turning transformation position of the page-turning reference point in the page-turning reference point relative to the page initial position of the page-turning reference point, and determining the page-turning book page according to the displacement change The page-turning action area contained in the ;

   Obtain the page initial position of each page image unit and shadow element contained in the page-turning action area, calculate and display the page-turning transformation position of each page image unit and shadow element contained in the page-turning action area, so as to realize the Describes the simulated page-turning processing of book pages.
2. The method according to claim 1, wherein the adding a shadow element to the original book page to be turned comprises:

   A page boundary line included in the original book page to be turned is determined, and a shadow element is added to the outer area of the original book page along the page boundary line.
3. The method according to claim 2, wherein determining a page boundary line included in the original book page to be turned, and adding a shadow element to the outer area of the original book page along the page boundary line comprises:

   acquiring a touch position corresponding to the page turning instruction, and determining a first page boundary line and/or a second page boundary line adjacent to the touch position;

   adding a first shadow element along the first page boundary line in the outer area of the original book page; and/or adding a second shadow element along the second page boundary line in the outer area of the original book page.
4. The method according to claim 3, wherein the boundary line of the first page and the boundary line of the second page are perpendicular to each other; and the shadow element is a translucent picture element.
5. The method according to claim 3 or 4, wherein the adding a first shadow element along the first page boundary line in the outer area of the original book page; and/or along the second page boundary line Adding a second shadow element to the outer area of the original book page includes:

   adding the first shadow element to an outer area of the original book page along a first partial line segment contained in the first page boundary line; and/or along a second partial line segment contained in the second page boundary line adding the second shadow element to the outer area of the original book page by a line segment;

   Wherein, the line segment length of the first partial line segment and/or the second partial line segment is determined according to the sliding displacement amount of the sliding operation corresponding to the page turning instruction.
6. The method according to any one of claims 1-5, wherein the determining the page-turning action area included in the page of the page-turning book according to the displacement change comprises:

   Calculate the page curling radius corresponding to the page turning instruction according to the displacement change;

   The page-turning action area included in the book page is determined according to the page curling radius, the page initial position of the page-turning reference point, and the page-turning transformation position of the page-turning reference point.
7. The method according to claim 6, wherein, according to the page curling radius, the page initial position of the page turning reference point, and the page turning transformation position of the page turning reference point, it is determined that the book page contains The page-turning action area includes:

   determining a reference line passing through the page initial position of the page turning reference point and the page turning transformation position of the page turning reference point, and determining a target point located on the reference line according to the page curl radius;

   The page-turning action area included in the book page is determined according to the boundary line passing through the target point and perpendicular to the reference line.
8. The method according to claim 6 or 7, wherein the calculating the page curl radius corresponding to the page turning instruction comprises:

   If the displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is less than a preset lower limit threshold, determine the page curling radius corresponding to the page turning instruction is the preset lower limit value;

   If the displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is greater than a preset upper limit threshold, determine the page curling radius corresponding to the page turning instruction is the preset upper limit value;

   If the amount of displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is between the preset lower threshold and the preset upper threshold, then according to The displacement variation and the circle radius formula calculate the page curling radius.
9. An electronic device, comprising: a processor, a memory, a communication interface and a communication bus, the processor, the memory and the communication interface communicate with each other through the communication bus;

   The memory is used to store at least one executable instruction, and the executable instruction causes the processor to perform the following operations:

   In response to the received page-turning instruction, a shadow element is added to the original book page to be turned to obtain a page-turning book page containing the shadow element;

   Obtaining the displacement change between the page-turning transformation position of the page-turning reference point in the page-turning reference point relative to the page initial position of the page-turning reference point, and determining the page-turning book page according to the displacement change The page-turning action area contained in the ;

   Obtain the page initial position of each page image unit and shadow element contained in the page-turning action area, calculate and display the page-turning transformation position of each page image unit and shadow element contained in the page-turning action area, so as to realize the Describes the simulated page-turning processing of book pages.
10. 9. The electronic device of claim 9, wherein the executable instructions cause the processor to:

    A page boundary line included in the original book page to be turned is determined, and a shadow element is added to the outer area of the original book page along the page boundary line.
11. 11. The electronic device of claim 10, wherein the executable instructions cause the processor to:

    acquiring a touch position corresponding to the page turning instruction, and determining a first page boundary line and/or a second page boundary line adjacent to the touch position;

    adding a first shadow element along the first page boundary line in the outer area of the original book page; and/or adding a second shadow element along the second page boundary line in the outer area of the original book page.
12. The electronic device according to claim 11, wherein the first page boundary line and the second page boundary line are perpendicular to each other; and the shadow element is a translucent picture element.
13. The electronic device of claim 11 or 12, wherein the executable instructions cause the processor to:

    adding the first shadow element to an outer area of the original book page along a first partial line segment contained in the first page boundary line; and/or along a second partial line segment contained in the second page boundary line adding the second shadow element to the outer area of the original book page by a line segment;

    Wherein, the line segment length of the first partial line segment and/or the second partial line segment is determined according to the sliding displacement amount of the sliding operation corresponding to the page turning instruction.
14. The electronic device of any of claims 9-13, wherein the executable instructions cause the processor to:

    Calculate the page curling radius corresponding to the page turning instruction according to the displacement change;

    The page-turning action area included in the book page is determined according to the page curling radius, the page initial position of the page-turning reference point, and the page-turning transformation position of the page-turning reference point.
15. 15. The electronic device of claim 14, wherein the executable instructions cause the processor to:

    determining a reference line passing through the page initial position of the page turning reference point and the page turning transformation position of the page turning reference point, and determining a target point located on the reference line according to the page curl radius;

    The page-turning action area included in the book page is determined according to the boundary line passing through the target point and perpendicular to the reference line.
16. 15. The electronic device of claim 14 or 15, wherein the executable instructions cause the processor to:

    If the displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is less than a preset lower limit threshold, determine the page curling radius corresponding to the page turning instruction is the preset lower limit value;

    If the displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is greater than a preset upper limit threshold, determine the page curling radius corresponding to the page turning instruction is the preset upper limit value;

    If the amount of displacement change between the page-turning transformation position of the page-turning reference point relative to the page initial position of the page-turning reference point is between the preset lower threshold and the preset upper threshold, then according to The displacement variation and the circle radius formula calculate the page curling radius.
17. A non-volatile computer-readable storage medium, wherein at least one executable instruction is stored in the non-volatile computer-readable storage medium, and the executable instruction causes a processor to execute any one of claims 1-8. The simulated page turning method described above.
18. A computer program product comprising a computer program stored on a non-volatile computer-readable storage medium, the computer program comprising program instructions that, when executed by a processor, cause the processor to perform a The simulation page turning method according to any one of claims 1-8.

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