JPH10116348A - Plotting device and method, and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a clear plotting result without making it into a broken line in spite of the form of an area to be painted out by comparing a first coordinate corresponding to the area to be painted out in the scan line component of a scan line with the second coordinate of the next scan line and changing the second coordinate in accordance with a comparison result so that the painted-out area does not become discrete. SOLUTION: The inclination ΔR of the virtual right outline of the plotted graphics is checked (S507). When ΔR>=0, the right X-coordinate XR-1 of the scan line component of the scan line immediately before, which is previously stored in a step S515, is compared with the left X-coordinate XL or the scan line component of the adjacent scan line in the middle of a processing at present (S508). When XL>XR-1 , an overlap range does not exist in the range of both X-coordinates, the X-coordinates are adjusted so that the pixel which is turned on becomes discrete and the broken line does not occur. Namely, the value of the present left X-coordinate XL is substituted for the same value as the right X-coordinate XR-1 immediately before so as to change it (S509).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a drawing apparatus, a drawing method, and a storage medium, and more particularly to a drawing apparatus, a drawing method, and a storage medium for drawing an image by scanning line decomposition.

[0002]

2. Description of the Related Art Conventionally, in a drawing apparatus for approximately drawing a figure such as a polygon using a dot matrix, for example, a printing apparatus, various drawing methods for filling an area have been proposed. A method based on scan line decomposition is used.

[0003] The drawing method by scan line decomposition is as follows.
The graphic to be painted is scanned in the scan line direction (that is, the main scanning direction, hereinafter, this direction is referred to as an x direction, and a direction orthogonal to the main scanning direction is referred to as a y direction). A process of turning on (filling) a pixel between the intersection point with the left contour line and the intersection point with the right contour line is sequentially executed for a necessary range of the y-coordinate, thereby realizing drawing of a desired figure. is there.

FIG. 1 is a diagram for explaining this processing.

In FIG. 1, grid lines 101 indicate pixel boundaries in the main scanning direction, and 102 indicates pixel boundaries in the sub-scanning direction.
Each square area surrounded by each grid line in both scanning directions represents one pixel. 103, 104, 105, and 106
Are the left contour line, the right contour line, the upper contour line, and the lower contour line of the figure to be filled, respectively, which are virtually provided and are not actually drawn.

In FIG. 1, pixels indicated by oblique hatching are virtual outlines 103, 104, and 10 respectively.
These pixels are turned on as a result of filling a virtual figure composed of 5, 106.

Next, a process for determining a pixel to be turned on by a method based on scan line decomposition will be described. In FIG. 1, reference numeral 107 denotes a start point of the left contour line 103, 108 denotes an end point of the left contour line 103, 109 denotes a start point of the right contour line 104, and 110 denotes an end point of the right contour line 104. Here, the coordinates of the start point 107 are represented by (XLS, Y
S), the coordinates of the end point 108 are (XLE, YE), the coordinates of the start point 109 are (XRS, YS), and the coordinates of the end point 110 are (XRE, YE). When the inclination of the left and right contour lines is defined as x increment / y increment, the inclination of the left contour line 103 is (XLE-XLS) / (YE-YS). This inclination is defined as ΔL. Similarly, the inclination of the right contour line 104 is (XRE-XRS) / (YE-YS). This inclination is defined as ΔR.

Thus, the x-coordinate XLn of the intersection of each of the scan line indicated by y = YS + n (n is a positive integer) and the left contour line 103 and the right contour line 104 is obtained.
And XRn are

[0009]

XLn = XLS + (ΔL * n) (1) XRn = XRS + (ΔR * n) (2)

The pixel to be turned on may be determined according to the result of this operation. The second term of both formulas can be considered, for example, by truncating or rounding off the decimal part.
Since there is no particular limitation, the description is omitted here.

XLn, X calculated according to the above formulas
By performing the process of turning on the left and right pixels determined for Rn on the pixels of the y-coordinate in a predetermined range, drawing a figure formed in a continuous area as shown in FIG. Can be. In the conventional example described here, the boundary of the pixel formed by each grid line in both scanning directions is
The pixel to be turned on is determined by the rule that the pixel at the y coordinate is turned on when the coordinates of the lower boundary line in the figure are exceeded.

[0012]

However, in the above-described conventional example, there is a problem that depending on the shape of the region to be filled, each scan line component obtained by the decomposition of the scan line may not be able to form an intended region. Less than,
This problem will be described.

FIG. 2 is an explanatory diagram showing an example in which each scan line component obtained by decomposing a scan line does not form an area. In FIG. 2, grid lines 201 indicate pixel boundaries in the main scanning direction, 202 indicates pixel boundaries in the sub-scanning direction, and each square area surrounded by each grid line in both scanning directions indicates one pixel. Reference numerals 203, 204, 205, and 206 denote a left contour line, a right contour line, an upper contour line, and a lower contour line of a figure to be filled, respectively, which are virtually provided and are not actually drawn. In FIG. 2, pixels indicated by hatching are hatched.
Virtually provided contour lines 203, 204, 205, 206
Represents a pixel which is turned on as a result of filling the virtual figure constituted by the above-described method by the scan line decomposition, and a pixel which is turned on (filled) is expressed by the formula (1),
It is determined based on the calculation result of (2).

As is apparent from FIG. 2, in the method using the scan line decomposition, pixels PX1, PX2,.
Since X6 is filled, the contour lines 203, 204, 20
The area formed by 5, 206 is not continuous and is broken, and cannot be filled so as to form a continuous area. Such a broken line phenomenon occurs when the following condition is satisfied.

When the slopes ΔL and ΔR are positive: XL + ΔL> X
When R slopes ΔL and ΔR are negative: XR + ΔR <XL Therefore, the present invention has been made to solve the above-described problem, and when performing a filling process using a method based on scan line decomposition, It is an object of the present invention to provide a drawing apparatus, a drawing method, and a storage medium which can obtain beautiful drawing by preventing a broken line from being caused by the shape of a region to be made.

[0016]

In order to attain the above object, according to the present invention, there is provided a drawing apparatus which separates an area to be filled by a scan line and sequentially fills the area. Storage means for storing first coordinates of a scan line component of a line corresponding to the region to be filled, and a first coordinate corresponding to the region to be filled of a scan line component of a scan line next to the scan line Comparing means for comparing two coordinates with the first coordinate, and changing means for changing the second coordinate in accordance with the comparison result of the comparing means so that the filled area between the scan line and the next scan line is not dispersed. It is characterized by having.

Here, the first coordinates are coordinates of an intersection of the outline of the area to be filled and the scan line, and the second coordinates are coordinates of the outline and the next scan line. Are the coordinates of the intersection with.

Further, when the first coordinate and the second coordinate take a value at which the filled area is discrete, the changing means overlaps by replacing the second coordinate with the first coordinate. You can also

According to another aspect of the present invention, there is provided an apparatus according to the present invention, wherein a region to be filled, which is represented by a plurality of points, is subjected to scan line decomposition and is determined by the plurality of points. In a drawing apparatus for performing filling processing based on an outline, a point inspection unit for inspecting the number of points, an inclination inspection unit for inspecting inclinations of first and second outlines in directions different from a scan line, The first and second
Point adding means for adding a new point to a point constituting the area to be filled according to the inclination of the contour line.

Here, the first and second contour lines have the same starting point, and the first and second contour lines are provided by the inclination inspection means.
Whether the magnitude of the inclination of the contour line and the magnitude of the inclination of the second contour line have a predetermined relationship,
When the predetermined relationship is satisfied, the new point is added, and the area to be filled is defined based on the start point, the new point, and the end points of the first and second contour lines. The apparatus may further include a filling means for performing a filling process.

Further, the predetermined relationship represents a condition in which the region to be filled is discrete, and the gradient of the first contour is twice as large as the gradient of the second contour. A larger relationship can be used.

According to a seventh aspect of the present invention, there is provided a drawing method in which a region to be filled is divided into scan lines to sequentially fill the region. A storage step of storing a first coordinate corresponding to the region to be filled of the component, a second coordinate corresponding to the region to be filled of a scan line component of a scan line subsequent to the scan line, and A comparing step of comparing the first coordinates;
A changing step of changing the second coordinates in accordance with the comparison result in the comparing step so that the filled areas of the scan line and the next scan line are not dispersed.

Here, the first coordinate is a coordinate of an intersection of the outline of the region to be filled and the scan line, and the second coordinate is a coordinate of the outline and the next scan line. Are the coordinates of the intersection with.

Further, in the changing step, when the first coordinates and the second coordinates take values in which the filled area is discrete, the second coordinates may be replaced with the first coordinates.

In order to achieve the above object, a method according to the present invention as set forth in claim 10, wherein a region to be filled represented by a plurality of points is subjected to scan line decomposition and determined by the plurality of points. In a drawing method for performing filling processing based on a contour line, a point number checking step for checking the number of points, a slope checking step for checking the inclination of the first and second contour lines in a direction different from the scan line, The first
And a point adding step of adding a new point to a point constituting the area to be filled according to the inclination of the second contour line.

Here, the first and second outlines have the same starting point, and in the inclination inspection step, the magnitude of the inclination of the first outline and the inclination of the second outline are determined. It is checked whether the size is in a predetermined relationship, and in the point adding step, the new point is added when the predetermined relationship is satisfied, and the start point, the new point, the first and the second points are added. The method may further include a filling step of filling the area to be filled based on the end point of each of the two outlines.

Further, the predetermined relationship represents a condition in which the area to be filled is discrete, and the gradient of the first contour is twice as large as the gradient of the second contour. A larger relationship can be used.

In order to achieve the above object, the storage medium of the present invention according to the thirteenth aspect provides a first storage medium according to a region to be filled with a scan line component of a scan line.
A storage step of storing coordinates, a comparison step of comparing the first coordinates with second coordinates corresponding to the region to be filled in of a scan line component of a scan line next to the scan line; A program for a drawing method by scan line decomposition including a changing step of changing the second coordinate according to the comparison result in the comparing step is stored so that the filled area of the next scan line is not dispersed.

In order to achieve the above object, a storage medium according to the present invention according to claim 14, further comprising: a score inspection step of examining the number of a plurality of points representing an area to be filled by scanning line decomposition. An inclination inspection step of examining the inclination of the first and second contour lines in a direction different from the scan line; and forming the area to be filled in according to the number of points and the inclination of the first and second contour lines. A program of a drawing method including a point adding step of adding a new point to a point to be executed is stored.

[0030]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(First Embodiment) FIG. 3 is a block diagram showing a configuration of a drawing apparatus according to a first embodiment of the present invention. Here, as an example of the embodiment of the present invention,
Processing in a printing device, which is a type of drawing device, will be described.

The printing apparatus 30 has a microprocessor system including a ROM 32 storing various programs, fixed data, and the like, and a working RAM 33, and includes a control unit 34 for controlling the entire printing apparatus, and a host computer 300. Interface 35 for data communication with
A print command analyzing unit 36 that analyzes a print command input through the interface 35; a drawing unit 37 that performs drawing processing to develop a bitmap in a form that is actually printed; And an output unit 38 for permanently visualizing an image on paper by a laser beam printer. These components are connected by a system bus 39.

Next, the procedure in which the printing apparatus 30 draws a solid figure will be described with reference to the flowchart of FIG. The program of the drawing method represented by this flowchart is stored in the ROM 32 in advance, for example.

First, the printing apparatus 30 has the interface 3
5 receives a print command from a host computer 300 as an external device,
6 analyzes the print command (step S401). Next, it is determined whether the received print command is a filled graphic drawing command based on the analysis result (S402). If the received print command is a filled graphic drawing command, the drawing unit 37 performs a filled graphic drawing process (S403). Then, the process returns to step S401 to process the next print command.

On the other hand, in step S402, it is determined whether or not the received print command is a print end command unless it is a process of drawing a filled figure (S404). Here, if it is a print end command, the bitmap data generated by the drawing unit 37 is transferred to the output unit 38 to form a permanent visible image on paper, and the printing process ends. On the other hand, step S4
If the received print command is not a print end command in 04, another process is executed (S406). Then, the process returns to step S401 to process the next print command.

Next, a description will be given, with reference to the flowchart of FIG. 5, of the solid figure drawing process in step S403, which is characteristic of the first embodiment of the present invention.

First, the count value SL of a scan line counter for counting the number of processed scan lines is reset to 0 (step S501). In the present embodiment, it is assumed that the number of scan lines to be processed is known in advance. Next, a scan line component is calculated and obtained using Expressions (1) and (2) (S502). Subsequent to this arithmetic processing, it is checked whether the count value SL is 0 (S50).
3). Initially, the count value SL is 0, so the process proceeds to step S514. In step S514, the scan line components are stored as drawing data in a predetermined storage area (S514).

Subsequently, the left X coordinate of the scan line component of the processed scan line (the coordinate of the intersection point of the scan line and the virtual left contour of the figure to be filled) and the right X coordinate (the scan line Coordinate storage means (RAM3) for using the coordinates of the intersection of the figure to be filled with the virtual right contour line in the processing of the next scan line.
It is stored in the predetermined position of 3) (S515). Then, after incrementing the count value SL by 1 (S516),
It is checked whether the number of scan lines to be processed has been processed (S
517). Initially, since there are still scan lines to be processed, the process returns to step S502 to process the next scan line. If a predetermined number of scan lines have been processed in step S517, the processing of this flowchart ends.

In the processing of the second and subsequent scan lines, the scan line components are calculated again in step S502. In step S503, since the count value SL of the scan line counter is not 0, the virtual right contour of the figure to be drawn is obtained. Is checked (S507). Here, if the inclination ΔR of the right contour line is positive or 0 (ΔR ≧ 0), the right X coordinate XR of the scan line component of the immediately preceding scan line previously stored in step S515.
_-1 is compared with the left X coordinate XL of the scan line component of the adjacent scan line currently being processed (S508).

Here, if XL> XR- ₁ , there is no overlapping range in the range of both X coordinates, so that both X coordinates are adjusted so that the pixels to be turned on are not discrete and a broken line does not occur. That is, the process proceeds to step S509 to replace the current value of the left X coordinate XL with the same value as the immediately preceding right X coordinate XR- ₁ and change the value, and then proceeds to the process from step S514. On the other hand, if XL ≦ XR ₋₁ in step S508, since there is an overlapping range between the ranges of both X coordinates, even if the drawing is performed as it is, the turned-on pixels are not discrete and the figure drawn is broken. Since there is no scan line component, the process proceeds to step S514 and subsequent steps to store the scan line component as drawing data in a predetermined storage area.

On the other hand, when the inclination ΔR of the right contour line is smaller than 0 (ΔR <0) in step S507, the left X coordinate XL- ₁ of the previously stored scan line component of the immediately preceding scan line and the next X coordinate XL- ₁ The scan line component of the adjacent scan line currently being processed is compared with the right X coordinate XR (S510). Here, if XR <XL- ₁ , there is no overlapping range in the range of both X coordinates, so that both X coordinates are adjusted so that the pixels to be turned on are not discrete and a broken line is not generated.

That is, the flow advances to step S511 to replace the current value of the right X coordinate XR with the same value as the immediately preceding left X coordinate XL- ₁ and change the value, and the flow advances to the processing after step S514.
On the other hand, if XR ≧ XL ₋₁ in step S510, there is a range that overlaps the range of both X coordinates. Therefore, the process proceeds to step S514 in order to store the scan line component as drawing data in a predetermined storage area.

As described above, by adjusting the left and right X coordinates of the immediately preceding scan line adjacent to the scan line currently being processed, no gap is formed between the scan line components. Without being discrete, dashed lines do not occur regardless of the shape of the region to be filled, and a beautiful drawing result can be obtained.

In the present embodiment, when the X-coordinate is in a condition where a broken line occurs, the left or right X-coordinate of the currently processed scan line component is replaced with the left or right X-coordinate of the immediately preceding scan line component. To prevent the broken line from being formed, but it is possible to change the left or right X coordinate value of the immediately preceding scan line component by changing the simple processing procedure, or to change the left or right X coordinate value of the scan line component currently being processed. It is obvious to those skilled in the art that the same effect as in the present embodiment can be obtained by changing both the value and the right or left X coordinate value of the immediately preceding scan line component so that the X coordinate ranges overlap. It is.

(Second Embodiment) In the second embodiment of the present invention, a process in a printing apparatus as a drawing apparatus will be described. Since the printing apparatus according to the second embodiment of the present invention can be embodied with the same configuration as the printing apparatus according to the first embodiment described with reference to FIG. 3, the description is omitted here. Further, the printing apparatus 30 according to the second embodiment
The procedure for drawing the filled figure is the same as that described in the first embodiment with reference to the flowchart of FIG. 4, and thus the description thereof is omitted here.

Next, the drawing section 37 characteristic of the present embodiment.
Will be described with reference to the flowchart of FIG. The program of the drawing method represented by this flowchart is stored in the ROM 32 in advance, for example.

When the filled figure drawing command is input to the drawing unit 37 together with the vertex coordinates of the region to be filled, first, the number of vertices is checked to determine whether the shape of the region is a triangle (S601). If it is not a triangle, the process proceeds to S620, where the virtual contour between a plurality of points (four or more) that determine the shape is painted out by scanline decomposition, and the process is terminated. On the other hand, if it is a triangle,
The slope ΔL of the left contour connecting the first vertex having the smallest y coordinate to another vertex among the three vertices for determining the triangle, and the first
It is checked whether the sign of the gradient ΔR of the right contour line connecting the vertex and another vertex is the same sign (S602). If the signs are the same, it is determined whether the signs of ΔL and ΔR are positive or negative (S60).
3) After that, branching is performed according to the determination result, and subsequent processing is performed.

Here, the predetermined relationship between the inclination of the left contour and the absolute value of the inclination of the right contour will be described with reference to FIGS. FIG. 7 shows a case where the slopes ΔL and ΔR of both contour lines are positive, and FIG. 8 shows a case where the slopes ΔL and ΔR of both contour lines are negative. Both figures are explanatory diagrams in the case where the area to be filled is a triangle. For the sake of explanation, the inclination of the left and right contour lines is emphasized, but actually both contour lines are in the scan line direction. The triangle to be drawn has an extremely small dimension in the y-direction and has a very slight inclination, and is visually identified as a horizontal linear shape.

As is apparent from both figures, the left contour lines 703 and 803 and the right contour lines 704 and 8 of the area to be filled are shown.
In the case where 04 is the first vertices P ₁ and P ₃ as the starting points, the condition that the scan line component is broken (the dots in the area to be filled are discrete) is between the gradients ΔL and ΔR of both contour lines. Conditional expression,

[0050]

2ΔL> ΔR (when both slopes are positive) (3) or 2 | ΔR | <| ΔL | (when both slopes are negative) (4)

Returning to FIG. 6, if the slopes ΔL and ΔR of both contour lines are both positive in step S603 (see FIG. 7), the slope ΔL of the left contour line 703 and the slope of the right contour line 704 Conditional expression (3) where ΔR is a broken line
It is determined whether or not the condition is satisfied (S604). If Expression (3) is satisfied and the broken line occurs, it is determined whether the vertical line Lv perpendicular to the scan line passing through the end point Pm of the right outline 704 and the left outline 703 intersect with each other. Contour 7
04 based on the x-coordinates of the end points Ph and Pm (S
605). If they intersect, step S607 is performed as it is.
Proceed to.

Meanwhile, if not intersect, the process proceeds to step S607 by extending the left contour line 703 so as to intersect, the end of the intersection P ₂ and the right contour line 704 of the left contour line 703 after the extension and the vertical line Lv The distance d ₁ from the point Pm is obtained. Subsequently, a new vertex P ₁ ′ is added at a position lower by the distance d _{1 in the} y direction from the first vertex P _1, and the process proceeds to step S620.
On the other hand, if equation (3) is not satisfied in step S604, the dashed line does not occur, so the process proceeds to step S620 without adding a vertex. In step S620, 4 vertices P _1, P ₁ ', 4 of the imaginary contour line determined by _{P 2, Pm (P 1 -P} 1', P 1 -Pm, P
m−P ₂ , P ₂ −P ₁ ′) is subjected to a filling process by a normal scan line decomposition method. Note that P ₁ ,
The distance d ₁ between P ₁ ′ is smaller than the pixel size, and the drawing result is a straight line.

Further, if the slopes .DELTA.L and .DELTA.R of both contour lines are negative in step S603 (see FIG. 8),
It is determined whether the inclination | ΔL | of the left outline 803 and the inclination | ΔR | of the right outline 804 satisfy the conditional expression (4) of the broken line (S614). If Equation (4) is satisfied and the broken line occurs, it is determined whether the vertical line Lv perpendicular to the scan line passing through the end point Ph of the left outline 803 and the right outline 804 intersect with each other. End point P of contour line 704
The determination is made based on the x coordinates of h and Pm (S615). If they intersect, the process proceeds directly to step S617.

On the other hand, if not intersect, the process proceeds to step S617 by extending the right contour line 804 so as to intersect, the end of the intersection point P ₄ and the left contour line 803 of the right contour line 804 after the extension and the vertical line Lv The distance d ₂ from the point Ph is obtained. Subsequently, a new vertex P ₃ ′ is added at a position lower by the distance d _{2 in the} y direction from the first vertex P _3, and the process proceeds to step S619.
On the other hand, if equation (4) is not satisfied in step S614, the dashed line does not occur, so that the process proceeds to step S620 without adding a vertex. In step S620, 4 vertices P _3, P ₃ ', 4 of the imaginary contour line determined by _{P 4, Ph (P 3 -P} 3', P 3 -Ph, P
h−P ₄ , P ₄ −P ₃ ′) is subjected to a filling process by a normal scan line decomposition method. Note that P ₃ ,
The distance d ₂ between P ₃ ′ is smaller than the pixel size, and the drawing result is a straight line.

By the above processing, no gap is generated between the scan line components, so that a broken line does not occur regardless of the shape of the region to be filled, and a beautiful drawing result can be obtained.

In each of the above embodiments, an example is described in which the present invention is applied to processing in a printing apparatus. However, the present invention can be applied to other drawing apparatuses such as an image display apparatus.

The method of the present invention may be applied to a system composed of a plurality of devices or an apparatus composed of one device. Needless to say, the method of the present invention can also be applied to a case where the method is achieved by supplying a program to a system or an apparatus. In this case, by reading out a storage medium storing a program represented by software for achieving the method of the present invention into a system or an apparatus, the system or apparatus can receive the effects of the method of the present invention. Become.

[0058]

As described above, according to the first aspect of the present invention, when a region to be filled is separated by a scan line and successively filled, the scan line is processed. A first coordinate corresponding to an area to be filled with a scan line component is stored, and a second coordinate corresponding to an area to be filled with a scan line component of the next scan line is compared with the first coordinate, and scanning is performed. The second coordinate is changed according to the comparison result so that the filled area of the line and the next scan line is not dispersed, so that regardless of the shape of the area to be filled, a beautiful drawing result that does not become a broken line There is an effect that can be provided.

According to the second aspect of the present invention, a region to be filled represented by a plurality of points is subjected to scanline decomposition to form a contour determined by a plurality of points. Check the number of points when filling based on
Check the inclination of the first and second contour lines in a direction different from the scan line, and add a new point to a point constituting an area to be filled according to the number of points and the inclination of the first and second contour lines. Therefore, regardless of the shape of the region to be filled, a beautiful drawing result can be provided by preventing the broken line from being broken.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for explaining a conventional filling method using scan line decomposition.

FIG. 2 is an explanatory diagram for explaining a problem of a conventional filling method using scan line decomposition.

FIG. 3 is a block diagram illustrating a configuration of a drawing apparatus according to first and second embodiments of the present invention.

FIG. 4 is a flowchart illustrating a drawing method for performing a drawing process of a solid figure by the first and second embodiments of the drawing apparatus according to the present invention.

FIG. 5 is a flowchart illustrating a solid figure drawing process according to the first embodiment;

FIG. 6 is a flowchart illustrating a solid figure drawing process according to a second embodiment;

FIG. 7 is an explanatory diagram for explaining the relationship between the dashed lines of the filled area of the adjacent scan line and the inclination of the left and right contour lines.

FIG. 8 is an explanatory diagram for explaining the relationship between the dashed lines of the filled area of the adjacent scan line and the inclination of the left and right contour lines.

[Explanation of symbols]

 Reference Signs List 30 printing device 32 ROM 33 RAM 34 control unit 35 interface 36 print command analysis unit 37 drawing unit 38 output unit 39 system bus 103, 703, 803 left contour line 104, 704, 804 right contour line 300 host computer

Claims (14)

[Claims] 1. A drawing apparatus for separating a region to be filled by a scan line and sequentially performing a fill process, wherein a storage means for storing a first coordinate corresponding to the region to be filled of a scan line component of a scan line. Comparing means for comparing the first coordinates with the second coordinates corresponding to the region to be filled of the scan line component of the scan line next to the scan line; and comparing the scan line with the next scan line. A drawing unit that changes the second coordinates in accordance with the comparison result of the comparison unit so that the filled area is not dispersed. 2. The method according to claim 1, wherein the first coordinates are coordinates of an intersection of the outline of the area to be filled and the scan line, and the second coordinates are coordinates of the outline and the next scan line. 2. The drawing apparatus according to claim 1, wherein the coordinates are intersection coordinates of 3. When the first coordinate and the second coordinate take a value at which the filled area is discrete,
3. The drawing apparatus according to claim 1, wherein the second coordinates are replaced with the first coordinates so as to overlap. 4. A drawing apparatus for decomposing a region to be filled represented by a plurality of points into scan lines and performing a filling process based on an outline determined by the plurality of points, wherein a point inspection means for examining the number of points. An inclination inspection means for examining the inclination of the first and second contour lines in a direction different from the scan line; and determining the area to be filled according to the number of points and the inclination of the first and second contour lines. A drawing apparatus, comprising: point addition means for adding a new point to the constituent points. 5. The method according to claim 5, wherein the first and second contours have the same starting point, and the inclination inspection means determines the magnitude of the inclination of the first contour and the magnitude of the inclination of the second contour. The point adding means adds the new point when the predetermined relation is satisfied, and the start point, the new point, the first and second points 5. The drawing apparatus according to claim 4, further comprising a filling unit that performs a filling process on the region to be filled based on the end point of each of the contour lines. 6. The predetermined relationship represents a condition in which the region to be filled is discrete, and the magnitude of the inclination of the first contour is twice as large as the magnitude of the inclination of the second contour. The drawing apparatus according to claim 4, wherein the relationship is larger than the relationship. 7. A drawing method in which an area to be filled is scanned line-separated and sequentially filled, a first coordinate corresponding to the area to be filled of a scan line component of a scan line is stored. A comparing step of comparing a second coordinate and the first coordinate of a scan line component of a scan line next to the scan line according to the region to be filled; and comparing the scan line with the next scan line. A changing step of changing the second coordinates according to the comparison result in the comparing step so that the filled area does not become discrete. 8. The first coordinate is a coordinate of an intersection of the outline of the area to be filled and the scan line, and the second coordinate is a coordinate of the outline and the next scan line. The drawing method according to claim 7, wherein the coordinates of the intersection position are: 9. The method according to claim 1, wherein, in the changing step, when the first coordinates and the second coordinates take values at which the filled area is discrete, the second coordinates are replaced with the first coordinates. Item 7. The drawing method according to Item 7 or 8. 10. A drawing method in which a region to be filled represented by a plurality of points is subjected to scan line decomposition and a filling process is performed based on an outline determined by the plurality of points. An inclination inspection step of examining the inclination of the first and second contour lines in a direction different from the scan line; and determining the area to be filled according to the number of points and the inclination of the first and second contour lines. A point adding step of adding a new point to the constituent points. 11. The method according to claim 11, wherein the first and second contour lines have the same starting point, and in the inclination inspection step, the magnitude of the inclination of the first contour and the magnitude of the inclination of the second contour. In the point adding step, when the predetermined relationship is satisfied, the new point is added, and the start point, the new point, the first and second points are added. 11. The drawing method according to claim 10, further comprising a filling step of filling the area to be filled based on the end point of each of the contour lines. 12. The predetermined relationship represents a condition in which the area to be filled is discrete, and the gradient of the first contour is twice as large as the gradient of the second contour. The drawing method according to claim 10, wherein the relationship is larger than the relationship. 13. A storage step of storing a first coordinate corresponding to a region to be filled with a scan line component of a scan line, and said filling of a scan line component of a scan line next to the scan line is attempted. A comparing step of comparing a second coordinate corresponding to an area with the first coordinate; and changing the second coordinate in accordance with a comparison result in the comparing step so that a filled area of the scan line and the next scan line is not discrete. A storage medium storing a program of a drawing method by scan line decomposition including a changing step of performing the following. 14. A point inspection step for examining the number of a plurality of points representing an area to be filled by scanning line decomposition, and an inclination inspection for examining inclinations of first and second contour lines in directions different from the scan line. A program for a drawing method, comprising: a step of adding a new point to a point constituting the area to be filled according to the number of points and the inclinations of the first and second contour lines. A storage medium characterized by the following.