JP6663066B1 - Drawing program, drawing expression control device, control method, and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a uniform expression in drawing a line segment accompanied by a texture expression. SOLUTION: The program causes a computer that draws a line segment with a texture expression to transform a reference line formed of at least one section, and for each section of the transformed reference line, length of the section. Processing for determining the arrangement position of the texture expression element to be arranged, and for each of the texture expression elements for which the arrangement has been determined, the size and transparency of the texture expression element are determined according to the length of the corresponding section. A line segment configured by arranging the texture expression element on the deformed reference line based on the setting process, the information on the arrangement position of the texture expression element, and the information on the size and transparency of the texture expression element. The drawing process and the process are executed. [Selection diagram] FIG.

Description

  The present invention relates to a drawing program, a drawing expression control device, a drawing expression control method, and a recording medium, and more particularly, to a line segment drawing technology with texture expression.

  In recent years, in the technical field of computer graphics such as electronic games, drawing expression using a three-dimensional model has become mainstream. This is because, for example, when drawing the frames at a plurality of continuous points while moving the same character or background as in an animation, it is possible to reduce the time required for processing such as repeated drawing and light source calculation. In particular, for interactive content such as an electronic game in which the movement of a character changes in real time in response to an operation input, various viewpoint positions and directions can be prepared by preparing a 3D model or animation data in advance. It is possible to correspond to the drawing expression from. Normally, such three-dimensional graphics are constructed by constructing a three-dimensional model based on a plurality of two-dimensional images (cuts) prepared by a designer or the like and applying a texture to the model.

  On the other hand, three-dimensional graphics drawn by applying such a texture may give an impression different from an initial cut prepared by a designer or the like. Since three-dimensional graphics basically draw a three-dimensional model to which a texture is applied “correctly” for a specific viewpoint, an effect in a specific viewing direction, such as a cut drawn in a two-dimensional image, is used. It was difficult to reproduce the typical expression. For this reason, priority is given to the attractiveness of the expression unique to the two-dimensional image, and game content and the like mainly using the two-dimensional image on the game screen maintain a certain level of support.

  Patent Document 1 discloses a drawing technique capable of expressing a three-dimensional animation (three-dimensional expression) while maintaining the atmosphere and charm of a two-dimensional image drawn by a designer or the like. Specifically, in Patent Literature 1, a two-dimensional image is decomposed into respective parts such as hair, eyebrows, eyes, and a contour (face), and then a curved surface serving as a reference for the contour parts is adjusted according to the appearance of the two-dimensional image. Assign easily. Then, geometric deformation and movement are performed in accordance with the spherical surface of the contour rotated according to the direction of the face expressing the two-dimensional image of the other parts, and various adjustments can be applied, so that the original two-dimensional image can be applied. It realizes the designer's desired expression from different directions without destroying the impression. That is, unlike the method of drawing by simply applying a texture, the method described in Patent Literature 1 employs a method of deforming a two-dimensional image so that a designer's desired expression is realized.

JP 2009-104570A

  By the way, in a three-dimensional expression using a two-dimensional image as described in Patent Literature 1, a texture expression is given to a line segment existing on a ridge line or the like of a base two-dimensional image as one of the drawing expressions. Is also possible. The texture expression is not an expression in which a line segment is mechanically drawn, but an expression with a so-called brush stroke effect, such as that drawn using a writing implement such as a pencil or a paintbrush.

  In Patent Literature 1, three-dimensional expression using a two-dimensional image is performed by performing deformation, scaling, and rotation of parts of a two-dimensional image, but line segments such as ridges are also scaled similarly. In other words, the drawing expression used in the original part may not be properly reproduced. Therefore, a line segment such as a ridge line is configured as vector data, for example, and the shape of a reference line segment (reference line) is determined by changing the position of a control point or the like. You need an approach to drawing to be an expression.

  Conventionally, in an illustration editing application or the like that realizes texture expression, the texture expression of a line segment such as a brush stroke is represented by a number of texture expression elements (for expressing the texture) corresponding to the length of the outline of the reference line. Expression is performed by arranging unit elements, which are elements having a unique image pattern according to the texture to be expressed, so-called sprites). That is, the line segment of the brush stroke is expressed by arranging the texture expression elements of the image pattern defined for the corresponding brush in accordance with the shape and length of the line segment.

  However, in the texture expression by such a method, a desired expression can be realized in a still image handled by an illustration editing application or the like, but in a mode in which a continuous change transition is presented like a moving image (animation). There was a possibility that the expression would not be suitable. For example, when the reference line (outline) changes (extends) as shown in FIGS. 10A to 10D, when the texture expression elements are arranged according to the length, FIGS. 11A to 11D. As shown in (1), there is a possibility that the change in the arrangement density and the flicker occur in the transition of the change, and an expression that hinders stable viewing is made.

  The present invention has been made in view of the above-described problems, and provides a program, a drawing expression control device, a drawing expression control method, and a recording medium that ensure uniform expression in drawing a line segment with a texture expression. With the goal.

  In order to achieve the above object, a program according to the present invention provides a computer for rendering a line segment with a texture expression, a process of deforming a reference line composed of at least one section, For each section, a process of determining the arrangement position of the texture expression element to be arranged according to the length of the section, and for each of the texture expression elements whose arrangement is determined, the texture Processing for setting the size and transparency of the expression element, and disposing the texture expression element on the deformed reference line based on the information on the arrangement position of the texture expression element and the information on the size and transparency of the texture expression element And a process of drawing a line segment constituted by the above steps.

  With such a configuration, according to the present invention, it is possible to ensure a uniform expression in drawing a line segment accompanied by a texture expression.

FIG. 2 is a block diagram showing a functional configuration of a drawing expression control device 100 according to the embodiment and a modification of the present invention. The figure for explaining one mode of the selection condition of the candidate position which judges whether to arrange the texture expression element concerning the embodiment and the modification of the present invention. The figure which illustrated the pattern of the texture expression element which concerns on embodiment and modification of this invention. FIG. 7 is a diagram for explaining arrangement determination of texture expression elements according to the first embodiment of the present invention. 9 is a flowchart illustrating a drawing expression control process executed by the drawing expression control device 100 according to the first embodiment of the present invention. FIG. 2 is a diagram comparing a texture expression realized by the drawing expression control apparatus 100 according to the first embodiment of the present invention with a texture expression realized by a conventional method. FIG. 9 is a diagram for explaining arrangement determination for a line segment whose line width changes according to a first modification of the present invention. 9 is a flowchart illustrating a drawing expression control process executed by the drawing expression control device 100 according to the second embodiment of the present invention. The figure which illustrated arrangement | positioning of the texture expression element which concerns on Embodiment 2 of this invention. Diagram for explaining drawing of a line segment accompanied by texture expression according to the conventional method Another diagram for describing the drawing of a line segment with a texture expression according to the conventional method

[Embodiment 1]
Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. It should be noted that the following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are necessarily essential to the invention. Two or more of the features described in the embodiments may be arbitrarily combined. In addition, the same or similar components are denoted by the same reference numerals, and redundant description will be omitted.

  In one embodiment described below, the present invention is applied to drawing software configured to be installable and executable on a general-purpose information processing terminal (PC) having a screen drawing function, as an example of a drawing program. An example will be described. However, the present invention can be applied to any program capable of drawing a line segment with a texture expression according to the present invention by being executed in any device having a screen drawing function.

<< Configuration of drawing device >>
FIG. 1 is a block diagram illustrating a functional configuration of a drawing expression control device 100 according to an embodiment of the present invention.

  The control unit 101 is a control device such as a CPU, for example, and controls the operation of each block of the drawing expression control device 100. Specifically, the control unit 101 reads a program related to an operating system stored in the recording medium 102, a program related to a drawing application for drawing a three-dimensional space, and the like, and develops and executes the program in the memory 103. , And controls the operation of each block.

  The recording medium 102 is, for example, a non-volatile memory such as a rewritable ROM or a storage device such as an HDD detachably connected to the drawing expression control device 100. In addition, the recording medium 102 may include a recording medium such as a disk recording a game program having a function provided by a drawing application and accessible through a predetermined readable / writable interface such as an optical drive. . The recording medium 102 stores not only the above-mentioned program but also information such as parameters necessary for the operation of each block, various data used for presenting drawing objects (extended two-dimensional objects and three-dimensional objects), and the like.

  The memory 103 may be a volatile memory such as a RAM, for example. The memory 103 is used not only as a development area for developing programs and the like read from the recording medium 102, but also as a storage area for storing intermediate data and the like output in the operation of each block.

  The drawing unit 104 may be a drawing device such as a GPU, for example, and generates a screen (image) displayed in the display area of the display unit 110. In the present embodiment, the drawing unit 104 is displayed on the display unit 110 by drawing an object that is developed on a two-dimensional plane and includes at least a line segment (a straight line and a curved line) whose shape and texture can be changed. Generates a screen. The display control unit 106 controls (display updates) the screen generated by the drawing unit 104 in relation to the drawing application by the display control unit 106.

  The expression control unit 105 is a function module that realizes a line segment drawing function with texture expression, which is realized by executing a program related to a drawing application in the control unit 101. In the present embodiment, the expression control unit 105 is described as being configured as a functional module on software by executing the program, but the present invention is not limited to this. That is, the expression control unit 105 may be realized as hardware such as a microcomputer or a processor configured to perform the same processing as that of the functional module, or may be performed using both software and hardware. It may be realized.

  The display unit 110 may be a display device such as an LCD, for example. In the present embodiment, the display unit 110 is described as being a component included in the PC 100, but the present invention is not limited to this. The display unit 110 does not need to have the same housing as the rendering expression control device 100, and may be an external display device detachably connected to the rendering expression control device 100.

  The operation input unit 107 is a user interface of the drawing expression control device 100, such as a mouse, a keyboard, a pen tablet, and a game controller. When the operation input unit 107 detects an operation input made by various interfaces, the operation input unit 107 outputs a control signal corresponding to the operation input to the control unit 101. Alternatively, the operation input unit 107 notifies the control unit 101 that an event corresponding to the operation input has occurred.

《Drawing line segment with texture expression》
As described above, drawing of a line segment accompanied by texture expression such as a brush stroke is performed by arranging a plurality of texture expression elements along a reference line that defines the shape of the line segment. Normally, such line segment drawing settings include information indicating the frequency of the texture expression element for a unit section arranged with respect to the reference line, for example, to express the density of “paint” of the brush. The information on the frequency of the texture expressing element related to the line segment is defined by a designer or the like when the line segment is configured by an illustration editing application or the like. Further, the texture expression element forming the texture expression is selected from a plurality of types of preset or user-defined ones according to the appearance of the line segment.

  Here, the reference line is composed of vector data such as a Bezier curve defined by a plurality of control points, and the reference line is provided with one or more sections based on the control points.

  In the conventional method, the texture expressing element is configured to be simply arranged along the reference line of the section according to the length of the section, and the length of the section (path When the length was changed, the number of texture expression elements arranged increased or decreased by the change in the length. Further, since the size of the texture expression element to be arranged is determined according to the line width set for the reference line, the degree of overlap between elements changes depending on the changed length. As a result, when a continuous change in the length of the reference line occurs as described above, a density change may occur due to the appearance and disappearance of the texture expression element arranged along the reference line, and an unnatural density change may occur. The viewer can be given the impression that flickering has occurred.

  In the drawing expression control apparatus 100 according to the present embodiment, in order to reduce the occurrence of unnatural texture expression in the conventional method, the texture expression element is not simply increased or decreased according to the length of the section, but the interval length is changed. , Based on the number of arrangements of the texture expression elements allowed (the allowable number of arrangements), the control for scalably adjusting the mode of the texture expression elements to be arranged is performed. Here, the allowable number of arrangements corresponds to the number of arrangements when the texture expression element having the size corresponding to the line width of the section is set to 1, and is a concept of counting as 1 or less when the size of the arranged texture expression element is small. .

  Hereinafter, the drawing control of the line segment accompanied by the texture expression performed by the drawing expression control device 100 of the present embodiment will be described with reference to the drawings.

  In the drawing expression control device 100 according to the present embodiment, the expression control unit 105 determines the number of arrangements and the arrangement positions of the associated texture expression elements for each section of the reference line for the reference line accompanied by the texture expression. Basically, whether a texture expression element is arranged or not is basically determined when the texture expression element is arranged in the target section, and the uniform texture expression is performed within the allowable number of arrangement of the texture expression element determined by the texture expression. Is performed based on whether or not is secured. Accordingly, the expression control unit 105 sequentially selects candidates (candidate positions) of arrangement positions within a section determined based on a predetermined selection criterion, and determines whether to arrange the texture expression element at the candidate positions. Go on.

  Here, when the length of the section continuously changes, when the relative arrangement position of the texture expressing element in the section changes, or when the section returns to the same shape through the change, the different distribution In the case where the texture expression element is arranged in, an unnatural appearance change such as a change in shading of the texture expression or flickering can be presented. Therefore, in the rendering expression control device 100 of the present embodiment, the selection condition of the texture expression element candidate position is defined by the relative position in the section regardless of the length of the section.

  In the present embodiment, in order to simplify the understanding of the invention, as shown in FIG. 2, the selection conditions of the candidate positions are determined by sequentially setting the intermediate point between two adjacent points in which the arrangement of the texture expression elements is determined in the section. It is assumed that it is determined to be selected as a candidate position. Here, the starting point and the ending point of the section are defined such that the texture expression elements are always arranged, and the expression control unit 105 first sets the middle point between the starting point and the ending point as shown in FIG. It is selected as a candidate position, and it is determined whether or not to arrange a texture expression element. If it is determined that a texture expression element is to be arranged at the candidate position, the expression control unit 105 further determines an intermediate point between the start point and the intermediate point and an intermediate point between the intermediate point and the end point, as shown in FIG. In the procedure of selecting a point as a candidate position, a new candidate position (a position determined by further subdividing a section) is sequentially selected until it is determined that the texture expression element is not arranged at the candidate position that has been determined. Go. In other words, the candidate positions are positions in which different positions (positions that further subdivide the section) are sequentially selected in accordance with the determination result as to whether or not the texture expression element is to be arranged, and the selection has an order. In other words, the positions that can be candidate positions for the section are determined in advance regardless of the length of the section. , Priority exists.

<Arrangement judgment>
Next, a description will be given, with reference to the drawings, of a determination as to whether or not to place a texture expression element at the candidate position selected in this manner.

  First, a texture expression element to be arranged is selected from a plurality of texture expression elements provided for the line type in accordance with the line type (brush type or the like) of the line segment represented by the reference line. As shown in FIG. 3, patterns of different sizes are prepared for one type of texture expression element. These patterns are prepared so as to be compatible with several types of line widths, and those having an appropriate size according to the line width of the reference line are adopted and arranged. More specifically, when arranging the texture expression element on the reference line without particular adjustment, if a pattern having the same size as the line width exists, it may be used as it is, but if a pattern having the same size as the line width exists. If not, a pattern closest to the size among the patterns larger than the size is reduced and adopted. In the present embodiment, for the sake of simplicity, it is assumed that the reference line presented with the texture expression has a uniform line width in any section.

  For a candidate position selected in an arbitrary section of the reference line, whether or not the texture expression element is arranged at the candidate position is determined by, for example, the frequency (unit length such as brush density) set for the line type of the reference line. This is performed on the basis of the length of the route including the number of arrangements of the texture expression elements per line), the line width, and the candidate position to be determined. As shown in FIG. 4A, a path (target path) 400 to be determined, that is, a point (start point 401 and end point 402) adjacent to the candidate position and where the arrangement of the texture expression elements has already been determined is connected. A case will be described as an example where there is a target route 400 and a midpoint 403 of the target route 400 is selected as a candidate position.

  At this time, since the line width of the reference line is constant at w, if the texture expression element corresponding to the line width w is arranged around each of the start point 401, the end point 402, and the middle point 403, the elements If the overlap is not taken into account, as shown in FIG. 4B, 2w of the target route 400 will be filled with the texture expression element. More specifically, as shown in the figure, one texture expression element is managed in a square area whose one side length is equal to the line width. The target path 400 includes a half width of the texture expression element 405 arranged around the start point 401 and a half width of the texture expression element 406 arranged around the end point 402. Therefore, if the texture expression element 404 is arranged at the midpoint 403, the number of texture expression elements having the width w arranged on the target route 400 can be converted to 2. Hereinafter, when the texture expression elements of the size corresponding to the line width of the target path 400 are provisionally arranged in this manner, the actual number of texture expression elements of the same size in the target path 400 will be described as “temporary arrangement number”. I do.

On the other hand, in the reference line, since the setting frequency (the number of arrangements of the texture expression elements per unit length) desired by the designer is preset for the line type, the allowable arrangement number for the length of the target route 400 is:
The allowable number of arrangements = set frequency × path length can be derived. Therefore, if the number of provisional arrangements does not exceed the allowable arrangement number, it can be determined that the texture expression element 404 having the line width size can be arranged at the midpoint 403.

  On the other hand, if the provisional arrangement number exceeds the allowable arrangement number, if the line width size texture expression element 404 is arranged at the midpoint 403, it will exceed the allowable arrangement number. On the other hand, if the texture expression element is not arranged for such a middle point 403, a sparse part where the texture expression element is not arranged appears in the texture expression.

  In the present invention, in order to ensure a uniform texture expression even when such a midpoint 403 exists, the expression control unit 105 controls the display magnification and transmittance (in terms of α value or the like) of the texture expression element having a size corresponding to the line width. Is adjusted), a texture expression element is arranged at the midpoint 403. The display magnification and the transmittance of the texture expression element to be arranged may be, for example, a value obtained by dividing the allowable arrangement number by the provisional arrangement number. In this case, since the display magnification of the texture expression element is less than 1, the expression control unit 105 may perform control to adopt a pattern of a corresponding size as needed.

After changing the display magnification, the expression control unit 105 further determines whether or not to place a texture expression element, for example, also on the middle point between the start point 401 and the middle point 403. In this case, it is assumed that the number of provisional arrangements on the route between the start point 401 and the middle point 403 is derived by reflecting the display magnification at the point where the arrangement is determined. That is, as shown in FIG. 4C, for example, when the display magnification of the texture expression element arranged at the midpoint 403 is 0.7, the number of provisional arrangements on the target route is
0.5w + w + 0.7w / 2 = 1.85w
Therefore, it is 1.85.

  Further, in the present embodiment, a threshold value is provided for a value obtained by dividing the allowable arrangement number, which is the determination criterion, by the provisional arrangement number, and if the divided value is smaller than the threshold value, the texture expression element is not arranged at the candidate position. to decide. In this case, processing is performed so that the determination of the arrangement of the texture expression elements is not performed for the midpoints that are further subdivided into the priorities. Here, the divided value indicates the ratio between the allowable arrangement number and the provisional arrangement number when focusing on the target route, and the threshold value can ensure the texture without additionally arranging a small-sized texture expression element. As a matter of fact, it is set to a predetermined value.

《Drawing expression control processing》
Hereinafter, a specific process of the rendering expression control process executed by the rendering expression control device 100 of the present embodiment will be described with reference to the flowchart of FIG. The processing corresponding to the flowchart can be realized by the control unit 101 reading out a corresponding processing program stored in, for example, the recording medium 102, developing the program in the memory 103, and executing the program.

  Note that this drawing expression control process is performed, for example, when an object including a line segment (reference line + texture expression element) set to perform uniform texture expression is displayed in an editable mode in a drawing application. It will be described as being started at Here, the embodiment of the present invention is not limited to a mode in which the line segment is shown so as to be editable, and a control input for causing the line segment to deform according to an operation member such as an external application or a controller. May be performed, or the line segment may be deformed based on transition information of a predetermined drawing mode such as motion data.

  In S501, the control unit 101 determines whether or not an input for deforming the reference line has been made for a section included in a line segment with a texture expression (target line segment). Here, the target line segment is configured to include at least one section, and the deformation is performed by changing a control point that defines the section, inputting an operation related to adding a new control point, or the like. May be. In the present embodiment, description will be made assuming that the deformation of the reference line is performed by these operation inputs and that the determination of this step is performed, but it is understood that the present invention is not limited to this. The deformation of the reference may be based on another operation input. In addition, since the arrangement of the texture expression elements can be changed by enlargement or line width change, the deformation of the reference line may include a change in the length of the section and a change in line width. If the control unit 101 determines that an input for deforming the reference line has been performed for the section included in the target line segment, the process proceeds to S502; otherwise, the process proceeds to step S502. repeat.

  In step S502, the control unit 101 specifies a section in which the deformation has occurred among the sections included in the target line segment. The control unit 101 stores the information of the specified section in, for example, the memory 103.

  In step S <b> 503, under the control of the control unit 101, the expression control unit 105 selects one of the deformed sections in which the number and position of the texture expression elements are not determined as a target section.

  In step S <b> 504, the expression control unit 105 determines, under the control of the control unit 101, a candidate position related to the placement of the texture expression element based on a predetermined selection condition for the target section. Make a decision. As described above, the placement is determined based on the relative position in the section as a candidate position according to the priority order, and is performed on the target route including the candidate position based on the allowable arrangement number and the provisional arrangement number. More specifically, the expression control unit 105 derives a value obtained by dividing the allowable arrangement number of the target route by the provisional arrangement number, and determines the presence or absence of the arrangement based on whether the divided value exceeds a threshold. When the expression control unit 105 determines that the texture expression element is to be arranged, the expression control unit 105 determines the display magnification and the transparency of the texture expression element to be arranged according to the divided value (1 if it is 1 or more). The information is stored in association with the information indicating the target section and the arrangement position and added to the element arrangement information in the memory 103. Such an arrangement determination is repeated by selecting a new candidate position based on the selection condition until the divided value falls below the threshold value. When the number of texture expression elements to be arranged for the target section is determined, the expression control unit 105 associates information on the number of arrangements with the element arrangement information.

  In S505, under the control of the control unit 101, the expression control unit 105 determines whether there is an unselected section as a target section among the sections in which the deformation has occurred. If the expression control unit 105 determines that there is an unselected section as the target section, the process returns to step S502; otherwise, the expression control unit 105 shifts the process to step S506.

  In step S506, under the control of the control unit 101, the drawing unit 104 refers to the element arrangement information stored in step S504 for the section in which the deformation has occurred, and generates a screen in which an object including the target line segment after the deformation is drawn. . Then, the drawing unit 104 transmits the generated screen to the display control unit 106 and causes the display unit 110 to display the generated screen.

  As described above, according to the drawing expression control device of the present embodiment, it is possible to ensure a uniform expression in drawing a line segment accompanied by a texture expression. More specifically, for a section in which the reference line has been deformed, instead of simply arranging a number of texture expression elements according to the section length and according to only the line width to perform texture expression, the rendering of the present embodiment is performed. The expression control device is configured such that a texture expression element whose size and transmittance are adjusted in consideration of the allowable number of arrangements in a section can be further arranged. For this reason, even if the line segment is deformed, it is possible to avoid drawing in which the texture is impaired due to the unnatural arrangement of the texture expression elements.

  For example, by using the drawing expression control method of the present embodiment, when the line segment accompanied by the texture expression is extended, the drawing method in which the shading changes as shown in FIG. Even with such a deformation, a uniform texture can be ensured as shown in FIG.

[Modification 1]
In the first embodiment described above, a description is given assuming that a fixed line width is assigned to a line segment to which a texture expression is added, and a uniform line width is also assigned to each section. However, the embodiment of the present invention is limited to this. Instead, the present invention is also applicable to a mode in which the line width is not the same between the start point and the end point of the section. That is, as described in the arrangement determination of the first embodiment, similarly to the case where the size of the texture expressing element to be arranged at the middle point is adjusted to be equal to or less than w, it is possible to cope by changing the arrangement determination method related to the target route. I just need.

In such a manner in which the line width changes in the line segment, the information such as the density set for the line type of the reference line is not the frequency (the number of arrangement of the texture expression elements per unit length) but the desired information In order to realize the texture expression, it is assumed that the expression is defined by a rate of filling a unit length with a texture expression element. That is, since there are a plurality of types of patterns in the texture expression elements to be arranged, and when they are arranged on the reference line, the widths for filling the reference line direction (one-dimensional direction) are different. It is assumed that a concept (density coefficient) indicating the length of the length filled with the texture expression element including duplication is set as information such as the density. Therefore, for the target route, the permissible density (the ratio of the length that can fill the reference line direction of the target route with the texture expression element) is derived as the permissible density = density coefficient × path length instead of the permissible number of arrangements. It shall be used as a criterion for judgment.

  On the other hand, when the texture expression element is arranged in the target route (middle point), the line width changes instead of the provisional number (substantial number of texture expression elements of the same size in the target route). To make it different. That is, in a mode in which the line width changes in the line segment, the line width may be different at the start point, the end point, and the middle point of the target route, so the number of arrangements is not the number of arrangements based on the texture expression element of one size. When the texture expression element corresponding to the line width is arranged on the target route, the ratio (temporary density) of the length that fills the target route is used.

  Here, as for the reference line indicating a line segment having a non-uniform line width, it is assumed that the line width can be derived not only at the start point and the end point of each section but also at an arbitrary position in the section. The candidate position for determining whether or not the position can be arranged is determined on the assumption that a texture expression element corresponding to the line width of the position is arranged.

Thus, the temporary concentration of the target path, when the line width at both end points of the pathway w _s and w _e and the line width w _m of the candidate position is shown in FIG. 7,
Provisional concentration _{= w s / 2 + w m} + w e / 2
It can be derived as Then, the expression control unit 105 may similarly determine whether or not the texture expression element can be arranged at the candidate position based on a value obtained by dividing the temporary density by the allowable density.

[Embodiment 2]
In the above-described embodiment and modified examples, the aspect in which the texture expressing element is arranged on the reference line without rotating has been described. On the other hand, particularly when the reference line includes a linear section having a uniform line width, an unnatural impression can be given to the viewer by arranging the same texture expression elements continuously. That is, for example, in a texture expression of a brush, each texture expression element is basically formed by a dot pattern distributed discretely, but the same texture expression element is continuously arranged to draw a line segment. In this case, a regular and unnatural expression may appear. Therefore, in the present embodiment, an aspect will be described in which a regularity is prevented from appearing by applying a rotation when arranging the texture expressing element.

  By the way, when deformation occurs in at least a part of the line segment, the rotation of the texture expression element arranged at the same relative position in the corresponding section changes in accordance with expansion and contraction or movement of the section. For example, discontinuous changes in the texture expression element before and after the deformation may also cause flickering and shading. For this reason, the rotation angle of the texture expressing element arranged in the section is determined for each relative position in the section, and is not changed by the deformation. Further, the rotation angle of any texture expression element arranged in the section may be controlled so as to be different from the rotation angle of the texture expression element arranged adjacent thereto.

《Drawing expression control processing》
Hereinafter, a specific process of the rendering expression control process executed by the rendering expression control device 100 of the present embodiment will be described with reference to the flowchart of FIG. The processing corresponding to the flowchart can be realized by the control unit 101 reading out a corresponding processing program stored in, for example, the recording medium 102, developing the program in the memory 103, and executing the program.

  Note that this drawing expression control process is performed, for example, when an object including a line segment (reference line + texture expression element) set to perform uniform texture expression is displayed in an editable mode in a drawing application. It will be described as being started at In the drawing expression control processing of the present embodiment, steps for performing the same processing as the above-described drawing expression control processing of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only the steps for performing the processing will be described.

  After selecting the target section in S503, the expression control unit 105 determines a candidate position related to the arrangement of the texture expression element based on a predetermined selection condition for the target section under the control of the control unit 101 in S801. The arrangement of the texture expression element is determined for the candidate position. The arrangement determination may be made in the same manner as in S504 of the first embodiment. When the expression control unit 105 determines that the texture expression element is to be arranged, the expression control unit 105 determines the display magnification and the transmittance of the texture expression element to be arranged according to the divided value, and stores it in the element arrangement information. . The expression control unit 105 determines a rotation angle to be arranged for the texture expression element based on the information on the candidate position, and similarly stores the rotation angle in addition to the element arrangement information. At this time, as described above, the rotation angle determined is determined in advance based on the relative position of the candidate position in the target section, and the expression control unit 105 determines the texture expression element based on the determination condition. Determine the rotation angle.

  Then, in S505, when it is determined that there is no unselected section as the target section, the drawing unit 104 transmits the element arrangement information stored in S801 regarding the section in which the deformation has occurred under the control of the control unit 101 in S802. A screen is created by drawing an object including the target line segment after the reference. Then, the drawing unit 104 transmits the generated screen to the display control unit 106 and causes the display unit 110 to display the generated screen.

  By doing so, according to the drawing expression control device 100 of the present embodiment, for example, when the length of a section is elongated by deformation, as shown in FIG. The corners are set and arranged. 9 (a) to 9 (d) show a mode in which the sections are lengthened in order, it will be understood that the rotation angle does not change even if the size of the element arranged at the relative position is changed. . Thereby, in a mode in which a section undergoes continuous deformation or a mode in which the section returns to the same state through the deformation, a uniform texture expression can be ensured.

[Modification 2]
In the above-described embodiments and modified examples, the aspect in which the texture expression is performed by arranging the texture expression elements in the reference line direction, that is, the one-dimensional direction, has been described. However, the embodiment of the present invention is not limited to this. For example, depending on the line width of the line accompanied by the texture expression and the size pattern provided for the texture expression elements to be arranged, the arrangement of the texture expression elements in the one-dimensional direction satisfies the set allowable number of arrangements and the allowable density. Since a preferable situation is assumed, a texture expression element may be arranged in the two-dimensional direction. In this case, the expression control unit 105 only needs to determine the arrangement of the two-dimensional area.

[Embodiment 3]
In the above-described embodiment and the modified example, the mode in which the arrangement determination is performed based on the size (width) of the texture expressing element has been described, but the embodiment of the present invention is not limited to this. The texture expression is expressed by a distribution of colored pixels (including transmission colors and intermediate colors) and colorless pixels expressed in the pattern of the texture expression element, and the density of the line segment is arranged by the texture expression element. The case is caused by the distribution of colored pixels in the two-dimensional area.

  Therefore, in a mode in which the density of colored pixels per unit area is set for a line segment accompanied by texture expression, the expression control unit 105 determines the density for a two-dimensional area determined based on the line width and the path length for the path. By multiplying, the allowable density for the area may be derived. Then, for the texture expression element for which the arrangement determination is performed, the expression control unit 105 derives the density of the colored pixel in the area along the same route as that in the case where it is arranged at the candidate position as the temporary density, and uses these to determine the arrangement The size (or display magnification) and the transmittance of the texture expression element to be performed may be selected.

  In other words, in the embodiments described in the first and second embodiments and the first and second modified examples, the presence or absence of arrangement and the display magnification and transmittance of the arranged texture expression element are determined based on only the size of the texture expression element, and the uniformity is determined. Although the description has been made assuming that the drawing control is performed so as to provide a natural texture expression, as in the present embodiment, the drawing control may be performed based on the density based on the color pixels of the texture expressing element in the corresponding area. That is, according to the present invention, the presence or absence of the texture expression element, the display magnification of the texture expression element to be arranged, and the density based on the color pixel of the texture expression element in the corresponding area ensure the density defined for the texture expression. It may be realized by determining the transmittance.

[Other Embodiments]
The present invention is not limited to the above-described embodiment, and various modifications and changes can be made without departing from the spirit and scope of the present invention within the scope of the invention. The drawing expression control device according to the present invention can also be realized by a program that causes one or more computers to function as the drawing expression control device. The program can be provided / distributed by being recorded on a computer-readable recording medium or through a telecommunication line.

  100: rendering expression control device, 101: control unit, 102: recording medium, 103: memory, 104: rendering unit, 105: expression control unit, 106: display control unit, 107: operation input unit, 110: display unit

Claims (13)

Computer that draws line segments with texture expression,
Processing of deforming a reference line composed of at least one section;
For each section of the transformed reference line, a process of determining the arrangement position of the texture expression element to be arranged according to the length of the section;
For each of the texture expression elements whose arrangement has been determined, a process of setting the size and transparency of the texture expression element according to the length of the corresponding section;
Based on information on the arrangement position of the texture expression element and information on the size and transparency of the texture expression element, draw a line segment configured by arranging the texture expression element on the deformed reference line. Processing,
A drawing program characterized by executing the following. A candidate for an arrangement position for arranging the texture expression element in the section of the reference line is determined based on a predetermined selection condition regardless of the length of the section,
2. The non-transitory computer-readable storage medium according to claim 1, wherein, for each section of the reference line, an arrangement position at which the texture expression element is arranged is determined from among the arrangement position candidates determined for the section. . Priorities to be determined as arrangement positions are determined for the arrangement position candidates in the section of the reference line,
3. The arrangement position for arranging the texture expression elements in the order of priority from among the arrangement position candidates defined for the section, for each section of the reference line, wherein: Drawing program.   4. The non-transitory computer-readable storage medium according to claim 2, wherein even if the length of the section changes due to deformation of the reference line, a relative position of the arrangement position candidate in the section does not change. For the line segment accompanied by the texture expression, a condition that can secure the texture without additionally arranging the texture expression element is defined,
The method according to any one of claims 2 to 4, wherein, for each section of the reference line, whether or not the texture expression element is to be arranged as a candidate for the arrangement position of the section is determined based on the condition. Drawing program described in section. For the line segment accompanied by the texture expression, an allowable value in which the arrangement of the texture expression element is allowed per unit length is defined,
The size and transmittance of each section of the reference line when the texture expression element is arranged as a candidate for the arrangement position of the section are determined based on the permissible value. Drawing program. For the line segment accompanied by the texture expression, an allowable value that is allowed to be filled with the texture expression element per unit length is defined,
The size and transmittance of each section of the reference line when the texture expression element is arranged as a candidate for the arrangement position of the section are determined based on the permissible value. Drawing program. The texture expression element is an image pattern composed of colored and colorless pixels,
For the line segment accompanied by the texture expression, a permissible value of the density of the colored pixel per unit area is defined,
The size and transmittance of each section of the reference line when the texture expression element is arranged as a candidate for the arrangement position of the section are determined based on the permissible value. Drawing program. A line width is set for the line segment accompanied by the texture expression,
For each section of the reference line, the size and the transparency of the texture expression element to be arranged in the candidate of the arrangement position of the section are set based on the line width and the allowable value of the arrangement position candidate. The drawing program according to any one of claims 6 to 8, wherein: According to the relative position of the arrangement position in the section of the reference line, a rotation angle of the texture expression element arranged at the arrangement position with respect to the reference line is determined,
In the setting process, a rotation angle of the texture expression element to be arranged is further determined,
The drawing according to any one of claims 1 to 9, wherein, in the drawing processing, the texture expression element is arranged and drawn at a set rotation angle on the deformed reference line. Program. A drawing expression control device that draws a line segment with a texture expression,
Deforming means for deforming a reference line constituted by at least one section;
Determining means for determining, for each section of the reference line deformed by the deforming means, an arrangement position of a texture expression element to be arranged according to a length of the section;
Setting means for setting, for each of the texture expression elements whose arrangement has been determined by the determination means, in accordance with the length of the corresponding section, the size and transparency of the texture expression element;
Based on information on the arrangement position of the texture expression element and information on the size and transparency of the texture expression element, draw a line segment configured by arranging the texture expression element on the deformed reference line. Drawing means,
A drawing expression control device, comprising: A method for controlling a drawing expression device that draws a line segment with a texture expression,
A deformation step of deforming a reference line composed of at least one section;
A determination step of determining, for each section of the reference line deformed in the deformation step, an arrangement position of a texture expression element to be arranged according to a length of the section;
A setting step of setting, for each of the texture expression elements whose arrangement is determined in the determination step, the size and the transparency of the texture expression element according to the length of the section;
Based on information on the arrangement position of the texture expression element and information on the size and transparency of the texture expression element, draw a line segment configured by arranging the texture expression element on the deformed reference line. A drawing process;
A control method for a drawing expression device, comprising :   A computer-readable recording medium on which the program according to any one of claims 1 to 10 is recorded.