CN111524211B - Handwriting erasing method, handwriting erasing device and handwriting erasing equipment - Google Patents
Handwriting erasing method, handwriting erasing device and handwriting erasing equipment Download PDFInfo
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- CN111524211B CN111524211B CN202010307464.2A CN202010307464A CN111524211B CN 111524211 B CN111524211 B CN 111524211B CN 202010307464 A CN202010307464 A CN 202010307464A CN 111524211 B CN111524211 B CN 111524211B
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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Abstract
The invention provides a handwriting erasing method, device and equipment, wherein the method comprises the following steps: acquiring target block information of at least one target block aimed at when an erasing operation is performed in a designated drawing area, wherein the designated drawing area is divided into a plurality of blocks in advance, and each block comprises a plurality of position points capable of forming handwriting formation points; when at least one piece of target block information exists in the recorded handwriting information set corresponding to the first handwriting, erasing handwriting forming points in the target block in the first handwriting; the first handwriting is drawn handwriting in a designated drawing area, and the handwriting information set is used for recording block information of a block where each handwriting constituting point in the first handwriting is located. The invention can improve the processing efficiency.
Description
Technical Field
The present invention relates to the field of drawing technologies, and in particular, to a handwriting erasing method, apparatus and device.
Background
In some rendering software, such as electronic whiteboards, handwriting may be rendered or erased. The handwriting may be patterns, text, etc. In some cases, the erasing tool may erase only a portion of the writing when erasing, as shown in fig. 1 and 2, where fig. 1 is writing before erasing, and fig. 2 is writing after the writing in fig. 1 is performed with an erasing operation.
In a related mode, aiming at each handwriting forming point on the handwriting, traversing each position point in a region traversed by an erasing tool, checking whether the handwriting forming point and the traversed position point are the same, and if so, erasing the handwriting forming point so as to determine the erased handwriting when the traversing is completed.
In the above manner, the area passed by the erasing tool is traversed by taking the minimum granularity of the designated drawing area, namely the position point, as a unit, the data amount of each traversal is large, and the processing efficiency is low. Especially when the wiping track is long, the number of positions in the area where the wiping tool passes will be large, and the processing time will be long, possibly tens of seconds or even minutes, seriously affecting the user experience.
Disclosure of Invention
In view of the above, the present invention provides a handwriting erasing method, apparatus and device, which can improve the processing efficiency.
The first aspect of the present invention provides a handwriting erasing method, which includes:
acquiring target block information of at least one target block aimed at when an erasing operation is performed in a designated drawing area, wherein the designated drawing area is divided into a plurality of blocks in advance, and each block comprises a plurality of position points capable of forming handwriting formation points;
When at least one piece of target block information exists in the recorded handwriting information set corresponding to the first handwriting, erasing handwriting forming points in the target block in the first handwriting; the first handwriting is drawn handwriting in a designated drawing area, and the handwriting information set is used for recording block information of a block where each handwriting constituting point in the first handwriting is located.
According to one embodiment of the present invention, the handwriting information set is further used for recording point location information of points formed by each handwriting in the first handwriting;
the erasing handwriting composition points in the target block in the first handwriting comprises:
drawing handwriting in the appointed drawing area according to point position information of handwriting forming points which are not in the target block in the handwriting information set;
and clearing the first handwriting in the appointed drawing area.
In accordance with one embodiment of the present invention,
when at least one piece of target block information exists in the recorded handwriting information set corresponding to the first handwriting, the method further comprises: setting an erasure identifier for point location information of handwriting composition points in the target block in the handwriting information set;
The step of drawing the handwriting in the appointed drawing area according to the point position information of the handwriting forming point which is not in the target block in the handwriting information set, comprising the following steps:
and drawing handwriting in the appointed drawing area according to the point position information which is not set with the erasure identification in the handwriting information set.
In accordance with one embodiment of the present invention,
the handwriting information set is used for sequentially recording point position information of each handwriting forming point according to the sequence of the handwriting forming points forming the first handwriting;
drawing handwriting in the appointed drawing area according to point position information which is not set with erasure identification in the handwriting information set, wherein the method comprises the following steps:
traversing point location information in the handwriting information set;
if the traversed point location information is not provided with the erasure mark, setting a mark to be used for the point location information;
if the traversed point location information is set with the erasure mark, when the point location information with the mark to be used is currently existed, a handwriting is drawn in the appointed drawing area according to all the point location information with the mark to be used, and the mark to be used is removed.
According to one embodiment of the present invention, when the erasing operation is performed in the specified drawing area, the method further includes: drawing a second handwriting in the appointed drawing area along a track which is passed through when the erasing operation is executed in the appointed drawing area, wherein the second handwriting is used for shielding handwriting forming points in the target block in the first handwriting;
After the first handwriting is cleared in the specified drawing area, the method further comprises: and clearing the second handwriting in the appointed drawing area.
According to one embodiment of the present invention, the color of the second handwriting is a background color of the specified drawing area, and the second handwriting layer is superimposed on the first handwriting.
In accordance with one embodiment of the present invention,
the specified drawing area is a drawing area of the electronic whiteboard.
In accordance with one embodiment of the present invention,
the first handwriting includes a line composed of a plurality of different handwriting composition points.
A second aspect of the present invention provides a handwriting erasing apparatus, the apparatus comprising:
a target block information acquisition module, configured to acquire target block information of at least one target block targeted when an erasing operation is performed in a specified drawing area, where the specified drawing area is divided into a plurality of blocks in advance, and each block includes a plurality of position points that can form handwriting formation points;
the handwriting erasing module is used for erasing handwriting forming points in the target block in the first handwriting when at least one piece of target block information exists in the recorded handwriting information set corresponding to the first handwriting; the first handwriting is drawn handwriting in a designated drawing area, and the handwriting information set is used for recording block information of a block where each handwriting constituting point in the first handwriting is located.
According to one embodiment of the present invention, the handwriting information set is further used for recording point location information of points formed by each handwriting in the first handwriting;
the handwriting erasing module is specifically configured to, when erasing handwriting forming points in the target block in the first handwriting:
drawing handwriting in the appointed drawing area according to point position information of handwriting forming points which are not in the target block in the handwriting information set;
and clearing the first handwriting in the appointed drawing area.
In accordance with one embodiment of the present invention,
the handwriting erasing module is further configured to, when at least one piece of target block information exists in the recorded handwriting information set corresponding to the first handwriting: setting an erasure identifier for point location information of handwriting composition points in the target block in the handwriting information set;
the handwriting erasing module is specifically configured to, when the handwriting is drawn in the specified drawing area, according to point location information of handwriting formation points not in the target block in the handwriting information set:
and drawing handwriting in the appointed drawing area according to the point position information which is not set with the erasure identification in the handwriting information set.
In accordance with one embodiment of the present invention,
the handwriting information set is used for sequentially recording point position information of each handwriting forming point according to the sequence of the handwriting forming points forming the first handwriting;
the handwriting erasing module is specifically configured to, when handwriting is drawn in the specified drawing area according to point location information in the handwriting information set, where an erasing identifier is not set:
traversing point location information in the handwriting information set;
if the traversed point location information is not provided with the erasure mark, setting a mark to be used for the point location information;
if the traversed point location information is set with the erasure mark, when the point location information with the mark to be used is currently existed, a handwriting is drawn in the appointed drawing area according to all the point location information with the mark to be used, and the mark to be used is removed.
According to one embodiment of the invention, the apparatus further comprises: the simulated line drawing module is used for drawing second handwriting in the appointed drawing area along a track which is passed through when the erasing operation is executed in the appointed drawing area, and the second handwriting is used for shielding handwriting forming points in the target block in the first handwriting;
The handwriting erasing module is further configured to, after the first handwriting is cleared in the specified drawing area: and clearing the second handwriting in the appointed drawing area.
According to one embodiment of the present invention, the color of the second handwriting is a background color of the specified drawing area, and the second handwriting layer is superimposed on the first handwriting.
In accordance with one embodiment of the present invention,
the specified drawing area is a drawing area of the electronic whiteboard.
In accordance with one embodiment of the present invention,
the first handwriting includes a line composed of a plurality of different handwriting composition points.
A third aspect of the invention provides an electronic device comprising a processor and a memory; the memory stores a program that can be called by the processor; when the processor executes the program, the handwriting erasing method described in the foregoing embodiment is implemented.
A fourth aspect of the invention provides a machine-readable storage medium having stored thereon a program which, when executed by a processor, implements a handwriting erasing method as described in the previous embodiments.
The embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the appointed drawing area is divided into a plurality of blocks in advance, each block comprises a plurality of position points capable of forming handwriting forming points, the position points can form handwriting forming points when each position point passes through when handwriting is drawn, when handwriting is erased, after the target block information of a target block aimed at when the appointed drawing area executes erasing operation is obtained, the handwriting forming points in the target block in the first handwriting are erased according to whether at least one target block information exists in the block information of each handwriting forming point in the first handwriting drawn by the appointed drawing area, in the mode, the handwriting forming points needing to be erased in the first handwriting can be determined by taking the block as a unit, the handwriting forming points needing to be erased in the first handwriting do not need to be determined by taking the position points as a unit, and because the granularity of the block is larger than that of the position points, the processing time can be greatly improved, the erasing operation can be completed with higher speed, and the processing efficiency is higher.
Drawings
FIG. 1 is a schematic diagram of writing prior to erasing;
FIG. 2 is a schematic diagram of the writing of FIG. 1 after it has been erased;
FIG. 3 is a flow chart of a handwriting erasing method according to an embodiment of the invention;
FIG. 4 is a schematic illustration of designated drawing areas upon completion of movement of an erase tool in accordance with one embodiment of the present invention;
FIG. 5 is a schematic diagram of a designated drawing area upon completion of handwriting erasure in accordance with an embodiment of the present invention;
FIG. 6 is a block diagram of a handwriting erase device in accordance with an embodiment of the present invention;
fig. 7 is a block diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the invention. Rather, they are merely examples of apparatus and methods consistent with aspects of the invention as detailed in the accompanying claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various devices, these information should not be limited by these terms. These terms are only used to distinguish one device from another of the same type. For example, a first device could also be termed a second device, and, similarly, a second device could also be termed a first device, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context.
In order to make the description of the present invention clearer and more concise, some technical terms of the present invention are explained below:
bezier curve: mathematical curves applied to two-bit graphics applications. In general vector graphics software, a curve can be precisely drawn through a Bezier curve algorithm. The Bezier curve algorithm is, for example, a Bezier curve interpolation optimization algorithm.
The handwriting erasing method according to the embodiment of the invention is specifically described below, but is not limited thereto. In one embodiment, as shown in fig. 3, the handwriting erasing method may be an electronic device, and the type of the electronic device may be a computer device, a removable device, or the like, and the specific type is not limited.
The electronic device may be provided with drawing software, which may include a designated drawing area for drawing handwriting, where handwriting may refer to any pattern, text, etc. The user can draw handwriting on the designated drawing area through a brush function, and the handwriting can comprise one handwriting forming point or a line formed by a plurality of different handwriting forming points.
The lines may be bezier curves, that is, lines obtained by interpolating lines through which the drawing operation is performed on the brush by using a bezier curve interpolation algorithm. By interpolation, the points in the line can be increased, and the problem of overlarge spacing between adjacent points is avoided. In the Bezier curve interpolation algorithm, the interpolation may be 3, or 5, etc., taking interpolation as 3 as an example, 3 handwriting constituent points are inserted between adjacent points of the Bezier curve, and of course, the method is not particularly limited thereto.
Alternatively, the rendering software may be an electronic whiteboard. The electronic whiteboard may be software applied to a terminal device, which may include or be connected to a screen on which a drawing area of the electronic whiteboard may be displayed for drawing by a user. The user may draw on the screen by means of a finger or a stylus, etc., so that the corresponding handwriting is presented in the drawing area. The electronic whiteboard can be applied to conferences (including teleconferences or live conferences), or can be applied to teaching environments, and can be used in other occasions needing to be drawn.
Of course, the drawing software is not particularly limited thereto, and other drawing software having a handwriting drawing function is applicable.
In the following embodiments, description will be made taking drawing software as an example of an electronic whiteboard, and accordingly, the specified drawing area may be a drawing area of the electronic whiteboard, but should not be limited thereto.
In the embodiment of the invention, the appointed drawing area is divided into a plurality of blocks, and each block comprises a plurality of position points capable of forming handwriting constituent points.
In one division manner, the specified drawing area may be divided into n×m blocks, where N and M are positive integers, that is, the specified drawing area is divided into an array of N rows and M columns of blocks.
Alternatively, referring to fig. 4 and 5, the specified drawing area may be equally divided into M columns in the X direction (horizontal direction) and N rows in the Y direction (vertical direction), that is, the specified drawing area is divided into grid-like areas of one N rows and M columns, each grid-like area is one block, and the sizes of each block are equal. Of course, the sizes of the different blocks may also be different, and are not particularly limited.
For example, assuming that the size of the specified drawing area is 100×150, the size indicates that there are 100 rows of position points in the specified drawing area, each row contains 150 position points, and after the above division, N and M are 10, the specified drawing area may be divided into 10×10 blocks, each of which has the same size and 10×15, i.e., one block contains 150 position points, i.e., 150 position points capable of forming handwriting constituent points, and when drawing, a corresponding handwriting constituent point can be formed through each position point. Of course, the data herein is merely an example for making the above-described division clearer, and is not limited thereto.
It is understood that the specific division manner is not limited thereto, and other manners are also possible, for example, each block may be divided into two blocks with triangular shapes along any diagonal line on the basis of the above-mentioned division into n×m blocks; alternatively, the specified drawing area may be divided into: a plurality of blocks having circular shapes with different radii from each other with a center position point of a specified drawing area as a center (in this case, the position information of the blocks may be represented by a large radius or a small radius); alternatively, each circular ring block may be equally divided into a plurality of blocks (in this case, the position information of the block may be represented by coordinates in a polar coordinate system) on the basis of the above-described division into a plurality of circular rings, and the like.
After dividing the designated drawing area into a plurality of blocks, the handwriting erasing method of the embodiment of the present invention may be performed.
In one embodiment, as in FIG. 3, the handwriting erase method may include:
step S100: target block information of at least one target block for which an erase operation is performed in a specified drawing area is acquired.
The specified drawing area is divided into a plurality of blocks in advance, and each block comprises a plurality of position points capable of forming handwriting forming points. In other words, each block divided in the specified drawing area contains a plurality of position points, and when drawing, different position points can respectively form different handwriting forming points, and only part of position points in one block can form handwriting forming points, or all position points can form handwriting forming points or all position points do not form handwriting forming points.
The granularity of a block is larger than that of a location point, and the processing efficiency is higher than that of repeatedly processing an operation in units of a location point. Assuming that each block contains 50 position points and a certain area has 1000 position points, if the area is traversed by taking the position points as units, 1000 times are needed for each traversal to execute the operation A1, and if the area is traversed by taking the block as units, each traversal still executes the operation A1, only 20 times are needed, and the number of traversal times is smaller, so that the efficiency of the whole processing process can be improved.
The smaller the number of blocks into which the specified drawing area is divided, the larger the granularity, and the higher the processing efficiency in the subsequent handwriting erasing. Of course, the number of blocks to be specifically divided is not limited, and may be determined by a trade-off according to accuracy and processing time.
The erase operation may be triggered by a user with uncertainty for the device, so the target block for each time the erase operation is performed, and the target block information for the target block may be different. The target block information may be used to indicate a position of the target block, for example, the target block information may include coordinate position information of at least one vertex of the target block, such as coordinate position information of an upper left corner vertex, and may include other information, such as a size of the block, which is not limited thereto.
The at least one target block for which the erasing operation is performed in the designated drawing area may refer to a target block in which the selected location points to be erased are located when the erasing operation is performed, and specifically, which location points to be erased are selected depends on the erasing operation, and more specifically, may depend on the user's requirement.
Alternatively, the user may perform the erase operation by the erase tool, and the block passed by the erase tool may be determined as the target block by passing by a plurality of blocks when the erase tool performs the erase operation in the designated drawing area.
Of course, the erasing tool is not necessary here, and after the erasing mode is entered, the erasing operation may be performed directly according to a user instruction without presenting the erasing tool in the designated drawing area. In the following, description will be given by taking an example of performing an erasing operation by an erasing tool, but this should not be limited thereto.
In order to facilitate distinguishing the target block information of the target block for which the erasure tool is aiming at when performing different erasure operations, optionally, the target block information of each target block for which the erasure operation is aiming may be added in the same block information set each time the erasure operation is performed, and the target block information of the target block for which the erasure operation is aiming may be added in different block information sets.
When adding the target block information to the block information set, it may be checked whether the target block information exists in the block information set, if not, the target block information is added to the block information set, otherwise, the target block information is not added. Thus, repeated position information does not exist in the block information set, and repeated and redundant operations can be avoided.
Optionally, the size of the erasing tool is N1 times of the size of the block, N1 is a positive integer, and when the erasing tool performs the erasing operation in the specified drawing area, the block is the target block as long as at least one position point in the block is passed, in other words, the target block is the block where any position point where the erasing tool passes when performing the erasing operation in the specified drawing area. In this manner, only a portion of the target block through which the erase tool passes may be covered by the erase tool, and the final erase result may be somewhat in and out of the track of the erase tool, but as long as the erase tool size is much larger than the block size, e.g., more than 10 times the block size, it is not visually affected too much, and typically the user may accept such errors.
Of course, if it is desired to ensure that the erase result matches the trajectory of the erase tool, the erase tool meets the following requirements: the erase tool is N1 times the size of the block, N1 is a positive integer, and initially the erase tool covers the complete block and moves in steps of the entire block. Therefore, the target block through which the erasing tool passes can be completely covered by the erasing tool, handwriting forming points in the target block only need to be erased, subsequent handwriting forming points which are through in the process of executing operation by the erasing tool are ensured to be erased, and the erasing accuracy is improved.
With continued reference to fig. 3, the handwriting erase method may further include:
step S200: when at least one piece of target block information exists in the recorded handwriting information set corresponding to the first handwriting, erasing handwriting forming points in the target block in the first handwriting; the first handwriting is drawn handwriting in a designated drawing area, and the handwriting information set is used for recording block information of a block where each handwriting constituting point in the first handwriting is located.
When the first handwriting is drawn or when the first handwriting is drawn, the block information of each handwriting composition point of the first handwriting is recorded in the handwriting information set. Specifically, the block information of the block where each handwriting forming point of the first handwriting is located may be recorded according to the order of the handwriting forming points forming the first handwriting (for a line, the order from the start point to the end point of the handwriting).
The first handwriting may include a line composed of a plurality of different handwriting composition points, and/or an individual handwriting composition point, and the line may be a Bezier curve after interpolation, which is not particularly limited. The color of the first handwriting may be the same as or different from the background color of the designated drawing area, and the number of the first handwriting is not limited.
The target block is a block through which the erasing tool passes, so that handwriting in the target block needs to be erased as long as handwriting in the target block, and therefore, when at least one piece of target block information exists in the handwriting information set corresponding to the first handwriting, handwriting forming points in the target block in the first handwriting are erased.
Specifically, the block information of each handwriting forming point in the handwriting information set may be compared with each target block information, and if the block information is the same, it is determined that the handwriting forming point is in the target block, and the handwriting forming point needs to be erased.
For example, the target block information is the top left corner vertex coordinates (x 1, y 1) of the target block, the block information where one handwriting construction point is located is (x 2, y 2), and if x1=x2 and y1=y2, the handwriting construction point is located in the target block.
The manner of erasing the handwriting forming points in the target block in the first handwriting is not limited. For example, handwriting forming points in the target block in the first handwriting can be erased point by point, specifically, point location information of each handwriting forming point in the first handwriting can be recorded in the handwriting information set, point location information of the handwriting forming points in the target block in the handwriting information set can be traversed, and handwriting forming points in the target block are erased according to the traversed point location information. For another example, the first handwriting may be cleared and the handwriting composed of handwriting composition points in the first handwriting that are not in the target block may be redrawn, and so on.
In the embodiment of the invention, the appointed drawing area is divided into a plurality of blocks in advance, each block comprises a plurality of position points capable of forming handwriting forming points, the position points can form handwriting forming points when each position point passes through when handwriting is drawn, when handwriting is erased, after the target block information of a target block aimed at when the appointed drawing area executes erasing operation is obtained, the handwriting forming points in the target block in the first handwriting are erased according to whether at least one target block information exists in the block information of each handwriting forming point in the first handwriting drawn by the appointed drawing area, in the mode, the handwriting forming points needing to be erased in the first handwriting can be determined by taking the block as a unit, the handwriting forming points needing to be erased in the first handwriting do not need to be determined by taking the position points as a unit, and because the granularity of the block is larger than that of the position points, the processing time can be greatly improved, the erasing operation can be completed with higher speed, and the processing efficiency is higher.
In one embodiment, the handwriting information set is further used for recording point location information of each handwriting composition point in the first handwriting.
Optionally, the handwriting information set may be implemented by using an array structure, where each array element in the array structure is used to record block information of a block where each handwriting constituent point is located in the first handwriting, and point location information of the handwriting constituent point.
The point location information of the handwriting construction point, that is, the position information of the handwriting construction point in the designated drawing area, specifically, referring to fig. 4 and 5, one point location information may be composed of X coordinates and Y coordinates of the corresponding handwriting construction point in the designated drawing area.
The point position information of the handwriting forming point can represent the position of the handwriting forming point in the appointed drawing area.
In step S200 of the handwriting erasing method, the erasing handwriting forming points in the target block in the first handwriting includes:
step S201: and drawing handwriting in the appointed drawing area according to the point position information of the handwriting composition points which are not in the target block in the handwriting information set.
According to the target block information and the block information in the handwriting information set, handwriting forming points in the target block in the first handwriting can be determined, handwriting forming points which are not in the target block in the first handwriting can also be determined, and the handwriting forming points are formed after the position points in the target block are drawn. Therefore, the handwriting composed of the handwriting composing points which are not in the target block in the first handwriting can be drawn in the specified drawing area based on the point position information of the handwriting composing points which are not in the target block in the handwriting information set.
The drawn handwriting may include a line composed of a plurality of different handwriting constituent points, and/or individual handwriting constituent points, etc. The drawn handwriting is a part of the first handwriting which does not need to be erased, namely, a part of the first handwriting which is erased and positioned after handwriting forming points in the target block.
So far, the newly drawn handwriting and the first handwriting exist in the appointed drawing area at the same time, if the first handwriting is not cleared, the appointed drawing area still cannot show the erased effect under the influence of the first handwriting, and the first handwriting still appears in the appointed drawing area for a user.
Therefore, in step S200 of the handwriting erasing method, the erasing the handwriting forming point in the target block in the first handwriting further includes:
step S202: and clearing the first handwriting in the appointed drawing area.
After the first handwriting is cleared in the appointed drawing area, the newly drawn handwriting (handwriting formed by handwriting forming points which are not located in the target block in the first handwriting) is not influenced by the first handwriting any more, and the handwriting when the first handwriting is erased can be presented in the appointed drawing area, so that the required erasing effect is achieved. In other words, by the operations of newly drawing handwriting and removing the first handwriting, handwriting forming points in the target block in the first handwriting are erased.
For example, with continued reference to fig. 4 and 5, Z1 is a designated drawing area, Z11 is all target blocks through which the erase tool passes when performing an erase operation (hatched for ease of distinction, practically absent). In the manner described above, according to the point position information of the handwriting forming points which are not in the Z11 in the first handwriting, the handwriting formed by the handwriting forming points which are not in the Z11 in the first handwriting is redrawn in the appointed drawing area, and then the first handwriting in the appointed drawing area is cleared, so that the handwriting shown in fig. 5 is finally obtained.
In one embodiment, in step S200 of the handwriting erasing method, when at least one piece of target block information exists in the recorded handwriting information set corresponding to the first handwriting, the method further includes:
step S203: and setting an erasure identifier for point location information of handwriting composition points in the target block in the handwriting information set.
Specifically, for the block information of the block where each handwriting composition point in the handwriting information set is located, whether the block information is the same as any target block information or not can be checked, if so, at least one target block information exists in the handwriting information set, and an erasure identification is set for the point position information in the handwriting information set.
Optionally, the handwriting information set may be implemented by using an array structure, where each array element in the array structure is used to record block information of a block where each handwriting forming point is located in the first handwriting and point location information of the handwriting forming point, besides, a first field for setting an erasure identifier may be reserved in each array element, where the first field may initially set a first value, such as 0, for indicating that the erasure identifier is not set, when the erasure identifier needs to be set for the point location information, the first field in the array element where the point location information is located may be modified to a second value, such as 1, for indicating that the erasure identifier is set, and when the erasure identifier needs to be removed, the first field is modified from the second value to the first value.
Of course, the handwriting information set can also be implemented in other forms, such as a table, so that the manner of setting the erasure identifier can be changed adaptively, and taking the table as an example, the table entry for setting the erasure identifier is added in the table.
In this way, all the point location information of the handwriting composition points in the target block in the handwriting information set is provided with the erasure identification, and all the point location information of the handwriting composition points not in any target block is not provided with the erasure identification.
Correspondingly, in step S201 of the handwriting erasing method, the drawing handwriting in the specified drawing area according to the point location information of the handwriting forming point not located in the target block in the handwriting information set includes:
step S2011: and drawing handwriting in the appointed drawing area according to the point position information which is not set with the erasure identification in the handwriting information set.
The point position information which is not provided with the erasure mark in the handwriting information set, namely the point position information of the handwriting construction point which is not positioned in any target block in the first handwriting, is used for drawing the handwriting in the appointed drawing area according to the point position information, so that the handwriting which is not positioned in the target block in the first handwriting and is reconstructed by the handwriting construction point, namely the handwriting required by a user, can be obtained, and the handwriting can comprise independent handwriting construction points, lines formed by a plurality of different handwriting construction points and the like.
In one embodiment, the handwriting information set is to record the point position information of each handwriting forming point in sequence according to the sequence of the handwriting forming points forming the first handwriting.
Optionally, the handwriting information set may be implemented by using an array structure, where each array element in the array structure is used to record point location information of each handwriting constituent point in the first handwriting. Of course, other information, such as erasure identification of point location information, status, etc., may also be recorded in the array structure.
When the point position information of each handwriting forming point is recorded in sequence according to the sequence of the handwriting forming points forming the first handwriting, the point position information can be recorded in the array structure from small to large in the sequence of the array subscripts. Thus, the sequence of the handwriting forming points forming the first handwriting is the sequence from small to large of the plurality of subscripts, so that the handwriting forming points can be conveniently obtained according to the sequence of the handwriting forming points forming the first handwriting.
Correspondingly, in step S2011 of the handwriting erasing method, handwriting is drawn in the specified drawing area according to the point location information in the handwriting information set, where the erasing identifier is not set, and the method includes the following steps:
s20111: traversing point location information in the handwriting information set;
s20112: if the traversed point location information is not provided with the erasure mark, setting a mark to be used for the point location information;
s20113: if the traversed point location information is set with the erasure mark, when the point location information with the mark to be used is currently existed, a handwriting is drawn in the appointed drawing area according to all the point location information with the mark to be used, and the mark to be used is removed.
In step S20111, when the handwriting information set is implemented by adopting an array structure, the point location information in the array structure corresponding to the first handwriting may be traversed according to the sequence from the small index to the large index of the array.
In step S20112, if the traversed point location information is not set with the erasure flag, it is indicated that the handwriting forming point corresponding to the point location information is not located in any target block, so that the handwriting forming point needs to be redrawn, and a flag to be used is set for the point location information, so as to redraw the handwriting. The manner of setting the to-be-used flag for the point location information may be the same as the manner of setting the erasure flag, and will not be described here again.
However, it is currently not known whether there is dot position information of handwriting constituent points that are not in the target block after the dot position information in the handwriting information set, and if there is dot position information, the dot position information is used for drawing into a line, so that drawing is not performed at this time.
In step S20113, if the traversed point location information is set with the erasure flag, it is indicated that the handwriting forming point corresponding to the point location information is in the target block, so that the handwriting forming point needs to be erased, the flag to be used is not set at this time, but when the point location information with the flag to be used currently exists, a handwriting is drawn in the specified drawing area according to all the point location information with the flag to be used, and all the flags to be used of the point location information with the flag to be used are removed, so that repeated use is avoided.
When a handwriting is drawn in the appointed drawing area according to the point position information of all the marks to be used, if the number of the point position information of the marks to be used is one, drawing a point in the appointed drawing area according to the point position information of the marks to be used; if the number of the point location information of the currently set mark to be used is more than two, a line is drawn in the designated drawing area according to all the point location information of the set mark to be used, and each point in the line corresponds to the point location information of the set mark to be used.
Thus, after the first handwriting is erased, the original continuous and unerased handwriting forming points can still be positioned on the same line. Optionally, relevant information of the newly drawn handwriting can be recorded, including block information, point location information, attribute information and the like of a block where the note forming point in the handwriting is located.
For example, in the first handwriting, the point location information of the 1 st to 10 th handwriting constituent points is not set with an erasure flag, so when traversing the point location information of the 10 handwriting constituent points, a to-be-used identifier is set for the point location information; when traversing to the 11 th handwriting forming point, determining that the point position information of the 11 th handwriting forming point is provided with an erasing mark, and judging that the point position information of the 1 st to 10 th handwriting forming points is provided with a mark to be used at the moment, so that drawing a handwriting in a designated drawing area according to the point position information of the 1 st to 10 th handwriting forming points, wherein the handwriting is a line formed by the 1 st to 10 th handwriting forming points, and removing the mark to be used of the point position information of the 1 st to 10 th handwriting forming points, thereby avoiding repeated drawing of the 1 st to 10 th handwriting forming points; subsequent traversals and the like are not described in detail herein.
In one embodiment, in the handwriting erasing method, when the erasing operation is performed in the specified drawing area, the method further includes:
step S110: and drawing a second handwriting in the appointed drawing area along a track which is passed through when the erasing operation is executed in the appointed drawing area, wherein the second handwriting is used for shielding handwriting forming points in the target block in the first handwriting.
Taking the erasing operation performed by the erasing tool as an example, when the erasing tool performs the erasing operation in the specified drawing area, the second handwriting can be drawn in the specified drawing area along the moving track of the erasing tool, and the drawn second handwriting can shield handwriting forming points in the target block in the first handwriting, namely, the second handwriting can shield handwriting forming points which need to be erased by a user, so that the erasing requirement of the user can be met visually.
However, since the second handwriting only obstructs the portion of the first handwriting to be erased, and does not actually erase the portion, if the user moves the first handwriting or the second handwriting, the portion of the first handwriting that is obstructed may still be presented to the user, and a problem that the portion that is not required to be erased is obstructed may also occur, and the portion of the handwriting is not actually erased, and thus, after step S110, handwriting erasure is still performed by the aforementioned method, such as steps S100 to S200.
Accordingly, in step S202 of the handwriting erasing method, after the first handwriting is cleared in the specified drawing area, the method further includes: and clearing the second handwriting in the appointed drawing area.
Since the second handwriting is also handwriting located in the designated drawing area, if the second handwriting is always kept in the designated drawing area, the subsequent handwriting drawing can be affected, and therefore, after the erasing operation is completed, that is, after the first handwriting is cleared in the designated drawing area, the second handwriting is cleared in the designated drawing area, so that the subsequent handwriting drawing is prevented from being affected.
In an embodiment, in the handwriting erasing method, the color of the second handwriting is a background color of the specified drawing area, and the second handwriting layer is superimposed on the first handwriting.
For example, the background color of the designated drawing area is white, the color of the second handwriting is also white, and the second handwriting is superimposed on the handwriting forming point of the target block in the first handwriting. Thus, when the user performs the erasing operation through the erasing tool, the places where the erasing tool passes become background colors, and handwriting of the places is erased in the view of the user.
Specifically, as shown in fig. 4, when the user performs the erasing operation by the erasing tool, after Z11, the second handwriting having the same color as the background color of the designated drawing area is drawn in Z11, and from the visual effect, the erasing effect is the same as that required by the user, that is, the result is the same as that shown in fig. 5.
By the method, the erased part of the first handwriting can be shielded by drawing the second handwriting in the erasing process of the erasing tool, the effect of visual erasing is achieved by specifying the background color of the drawing area, and then the steps S100-S200 are executed to truly erase the handwriting, so that the user experience can be improved, and the visual effect of the erasing tool in the erasing process can be achieved.
The present invention also provides a handwriting erasing apparatus, referring to fig. 6, the handwriting erasing apparatus 100 includes:
a target block information obtaining module 101, configured to obtain target block information of at least one target block for which an erasing operation is performed in a specified drawing area, where the specified drawing area is divided into a plurality of blocks in advance, and each block includes a plurality of position points where handwriting constituent points can be formed;
the handwriting erasing module 102 is configured to erase handwriting formation points in the target block in the first handwriting when at least one piece of target block information exists in the recorded handwriting information set corresponding to the first handwriting; the first handwriting is drawn handwriting in a designated drawing area, and the handwriting information set is used for recording block information of a block where each handwriting constituting point in the first handwriting is located.
In one embodiment, the handwriting information set is further used for recording point location information of points formed by each handwriting in the first handwriting;
the handwriting erasing module is specifically configured to, when erasing handwriting forming points in the target block in the first handwriting:
drawing handwriting in the appointed drawing area according to point position information of handwriting forming points which are not in the target block in the handwriting information set;
and clearing the first handwriting in the appointed drawing area.
In one embodiment of the present invention, in one embodiment,
the handwriting erasing module is further configured to, when at least one piece of target block information exists in the recorded handwriting information set corresponding to the first handwriting: setting an erasure identifier for point location information of handwriting composition points in the target block in the handwriting information set;
the handwriting erasing module is specifically configured to, when the handwriting is drawn in the specified drawing area, according to point location information of handwriting formation points not in the target block in the handwriting information set:
and drawing handwriting in the appointed drawing area according to the point position information which is not set with the erasure identification in the handwriting information set.
In one embodiment of the present invention, in one embodiment,
The handwriting information set is used for sequentially recording point position information of each handwriting forming point according to the sequence of the handwriting forming points forming the first handwriting;
the handwriting erasing module is specifically configured to, when handwriting is drawn in the specified drawing area according to point location information in the handwriting information set, where an erasing identifier is not set:
traversing point location information in the handwriting information set;
if the traversed point location information is not provided with the erasure mark, setting a mark to be used for the point location information;
if the traversed point location information is set with the erasure mark, when the point location information with the mark to be used is currently existed, a handwriting is drawn in the appointed drawing area according to all the point location information with the mark to be used, and the mark to be used is removed.
In one embodiment, the apparatus further comprises: the simulated line drawing module is used for drawing second handwriting in the appointed drawing area along a track which is passed through when the erasing operation is executed in the appointed drawing area, and the second handwriting is used for shielding handwriting forming points in the target block in the first handwriting;
the handwriting erasing module is further configured to, after the first handwriting is cleared in the specified drawing area: and clearing the second handwriting in the appointed drawing area.
In one embodiment, the color of the second handwriting is the background color of the specified drawing area, and the second handwriting layer is superimposed on the first handwriting.
In one embodiment of the present invention, in one embodiment,
the specified drawing area is a drawing area of the electronic whiteboard.
In one embodiment of the present invention, in one embodiment,
the first handwriting includes a line composed of a plurality of different handwriting composition points.
The implementation process of the functions and roles of each unit in the above device is specifically shown in the implementation process of the corresponding steps in the above method, and will not be described herein again.
For the device embodiments, reference is made to the description of the method embodiments for the relevant points, since they essentially correspond to the method embodiments. The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements.
The invention also provides an electronic device, which comprises a processor and a memory; the memory stores a program that can be called by the processor; when the processor executes the program, the handwriting erasing method described in the foregoing embodiment is implemented.
The embodiment of the handwriting erasing device can be applied to electronic equipment. Taking software implementation as an example, the device in a logic sense is formed by reading corresponding computer program instructions in a nonvolatile memory into a memory by a processor of an electronic device where the device is located for operation. In terms of hardware, as shown in fig. 7, fig. 7 is a hardware structure diagram of an electronic device where the handwriting erasing apparatus 100 according to an exemplary embodiment of the present invention is located, and in addition to the processor 510, the memory 530, the interface 520, and the nonvolatile memory 540 shown in fig. 7, the electronic device where the apparatus 100 is located in the embodiment may further include other hardware according to the actual functions of the electronic device, which will not be described herein.
The present invention also provides a machine-readable storage medium having stored thereon a program which, when executed by a processor, implements a handwriting erasing method as in any one of the preceding embodiments.
The present invention may take the form of a computer program product embodied on one or more storage media (including, but not limited to, magnetic disk storage, CD-ROM, optical storage, etc.) having program code embodied therein. Machine-readable storage media include both permanent and non-permanent, removable and non-removable media, and information storage may be implemented by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of machine-readable storage media include, but are not limited to: phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, may be used to store information that may be accessed by the computing device.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (8)
1. A handwriting erasing method, comprising:
acquiring target block information of at least one target block aimed at when an erasing operation is performed in a designated drawing area, wherein the designated drawing area is divided into a plurality of blocks in advance, and each block comprises a plurality of position points capable of forming handwriting formation points;
when at least one piece of target block information exists in the recorded handwriting information set corresponding to the first handwriting, erasing handwriting forming points in the target block in the first handwriting; the first handwriting is drawn handwriting in a designated drawing area, and the handwriting information set is used for recording block information of a block where each handwriting forming point in the first handwriting is located;
when the erasing operation is performed in the specified drawing area, the method further includes: drawing a second handwriting in the appointed drawing area along a track passing through the appointed drawing area when the erasing operation is executed, wherein the second handwriting is used for shielding handwriting forming points in the target block in the first handwriting, the color of the second handwriting is the background color of the appointed drawing area, and the second handwriting layer is overlapped on the first handwriting;
After the first handwriting is cleared in the specified drawing area, the method further comprises: and deleting the second handwriting.
2. The handwriting erasing method of claim 1, wherein the handwriting information set is further used for recording point location information of each handwriting composition point in the first handwriting;
the erasing handwriting composition points in the target block in the first handwriting comprises:
drawing handwriting in the appointed drawing area according to point position information of handwriting forming points which are not in the target block in the handwriting information set;
and clearing the first handwriting in the appointed drawing area.
3. A handwriting erasing method according to claim 2, wherein,
when at least one piece of target block information exists in the recorded handwriting information set corresponding to the first handwriting, the method further comprises: setting an erasure identifier for point location information of handwriting composition points in the target block in the handwriting information set;
the step of drawing the handwriting in the appointed drawing area according to the point position information of the handwriting forming point which is not in the target block in the handwriting information set, comprising the following steps:
And drawing handwriting in the appointed drawing area according to the point position information which is not set with the erasure identification in the handwriting information set.
4. A handwriting erasing method according to claim 3, wherein,
the handwriting information set is used for sequentially recording point position information of each handwriting forming point according to the sequence of the handwriting forming points forming the first handwriting;
drawing handwriting in the appointed drawing area according to point position information which is not set with erasure identification in the handwriting information set, wherein the method comprises the following steps:
traversing point location information in the handwriting information set;
if the traversed point location information is not provided with the erasure mark, setting a mark to be used for the point location information;
if the traversed point location information is set with the erasure mark, when the point location information with the mark to be used is currently existed, a handwriting is drawn in the appointed drawing area according to all the point location information with the mark to be used, and the mark to be used is removed.
5. A handwriting erasing method according to any one of claims 1-4, wherein,
the specified drawing area is a drawing area of the electronic whiteboard.
6. A handwriting erasing method according to any one of claims 1-4, wherein,
The first handwriting includes a line composed of a plurality of different handwriting composition points.
7. A handwriting erasing apparatus, comprising:
a target block information acquisition module, configured to acquire target block information of at least one target block targeted when an erasing operation is performed in a specified drawing area, where the specified drawing area is divided into a plurality of blocks in advance, and each block includes a plurality of position points that can form handwriting formation points;
the handwriting erasing module is used for erasing handwriting forming points in the target block in the first handwriting when at least one piece of target block information exists in the recorded handwriting information set corresponding to the first handwriting; the first handwriting is drawn handwriting in a designated drawing area, and the handwriting information set is used for recording block information of a block where each handwriting forming point in the first handwriting is located;
the simulated line drawing module is used for drawing second handwriting in the appointed drawing area along a track which is passed through when the erasing operation is executed in the appointed drawing area, the second handwriting is used for shielding handwriting forming points in the target block in the first handwriting, the color of the second handwriting is the background color of the appointed drawing area, and the second handwriting layer is overlapped on the first handwriting;
The handwriting erasing module is further configured to, after the first handwriting is cleared in the specified drawing area: and clearing the second handwriting in the appointed drawing area.
8. An electronic device, comprising a processor and a memory; the memory stores a program that can be called by the processor; wherein the processor, when executing the program, implements a handwriting erasing method according to any one of claims 1-6.
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| CN112181246B (en) * | 2020-09-18 | 2022-06-10 | 深圳创维数字技术有限公司 | Electronic whiteboard erasing method, device, equipment and computer readable storage medium |
| CN112732155B (en) * | 2020-12-30 | 2022-08-16 | 新东方教育科技集团有限公司 | Image display method, image display device, electronic apparatus, and storage medium |
| CN113345384B (en) * | 2021-05-28 | 2022-06-10 | 深圳市爱码讯实业发展有限公司 | Handwriting erasing method and system for handwriting board |
| CN113608646B (en) * | 2021-10-08 | 2022-01-07 | 广州文石信息科技有限公司 | Method and device for erasing strokes, readable storage medium and electronic equipment |
| CN114879897B (en) * | 2022-05-05 | 2024-04-02 | 北京有竹居网络技术有限公司 | Stroke processing method, device, equipment and storage medium |
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