JPH07234946A - Method and device for plotting polygon - Google Patents

Abstract

PURPOSE:To provide the method and device for plotting polygon capable of speedily plotting polygons in succession without separating it into triangles. CONSTITUTION:This device is provided with a polygon vertex register 105 temporarily storing the polygon vertex data in advance, vertex control device 101 performing control for storing the polygon vertex data, start point register 110 temporarily storing polygon vertex data by deciding the data to be the plotting start vertex, contour generating device 106 controlling sequentially the order of generating the contour of the polygon, vertex address up counter 103 outputting the next polygon vertex data in the clockwise direction of the contour of the polygon, vertex address down counter 104 outputting the next polygon vertex data in the counterclockwise direction thereof, interpolation device 102 interpolating the clockwise and counterclockwise contour straight lines of the polygon respectively, straight line plotting means 107 for plotting the polygon interpolation span taking the end points of the right and left contour straight lines as line segment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polygon drawing method and a polygon drawing apparatus for drawing a polygon at high speed on a display device such as a CRT display used for computer graphics.

[0002]

2. Description of the Related Art In the field of computer graphics, a drawing device for drawing at high speed has come into use. As a technique for improving the drawing speed of a drawing device, a method of drawing a polygon by utilizing the function of the drawing device has been developed.

A method of drawing a polygon with a conventional drawing apparatus will be described below. FIG. 15 is a block diagram showing the structure of a conventional drawing apparatus. In the figure, 801 is a triangle separating device, 802 is a triangular vertex register, 803 is a triangular side 1 interpolating device, 804 is a triangular side 2 interpolating device, 805 is a triangular side 3 interpolating device, 806 is an interpolating data selecting device, 82
1 is polygon vertex data, 822 is triangle vertex data,
823 is triangular side end point data, 824 is triangular side 1 linear interpolation data, 825 is triangular side 2 linear interpolation data, 826 is triangular side 3 linear interpolation data, 827 is span end point 2 data,
828 is a triangle data confirmation signal, 829 is a next span transmission request signal, 106 is a contour generation device, 107 is a line drawing device, 108 is an image memory, 109 is a display device, 130
Is a memory write data signal, and 131 is a video signal.

The operation of the drawing apparatus configured as described above will be described below with reference to the drawings. FIG. 16 is a diagram showing a triangle separation process of a conventional drawing apparatus, in which 201 is a drawing target polygon, 901 is polygon separation triangles 1 and 902.
Is a polygon separating triangle 2, and 903 is a polygon separating triangle 3.

FIG. 17 is a diagram showing a triangle interpolation process by a span of a conventional drawing apparatus. 1001 is a triangular vertex 1 of a divided triangle, 1002 is a triangular vertex 2 of a divided triangle, and 1003 is a divided triangle. Triangular vertices 3 and 1
004 is the triangular side 1 of the divided triangle, 1005 is the triangular side 2 of the divided triangle, 1006 is the triangular side 3 of the divided triangle, and 1007 is the triangular interpolation horizontal span of the divided triangle.

FIG. 18 is a diagram showing a polygon interpolation process using divided triangles in a conventional drawing apparatus. Reference numeral 1101 denotes polygon separating triangles 1 and 1 interpolated by a horizontal span.
Reference numeral 102 is a polygon separation triangle 2 interpolated by a horizontal span, and 1103 is a horizontal span interpolation of the polygon separation triangle 2.

First, when the polygon separating device 801 is supplied with polygon vertex data 821 of the drawing target polygon 201, the triangle separating device 801 selects the drawing target polygon 201 as the polygon separating triangle 1 (901) and the polygon separating triangle 2 (90).
2) and the polygon separation triangle 3 (903), and the triangle vertex data 822 which is each triangle vertex data is sequentially generated.

Next, the triangle vertex register 802 stores the triangle vertex data 82 generated by the triangle separating device 801.
In response to 2, the edge is separated into one long side and two short sides, and the triangle side end point data 823 according to the drawing direction is generated. A conventional drawing device interpolates a triangle from the top to the bottom of the display device 109 with a horizontal straight line (hereinafter referred to as “horizontal span” 1103 for interpolating a polygon separation triangle). Therefore, the triangle edge 1 interpolator 803 has a triangle triangle vertex 1 (1001) divided as the edge interpolation start vertex and a triangle triangle vertex 2 (100) divided as the edge interpolation end vertex.
2) is set, and the triangular side 2 interpolation device 804 sets the triangular vertex 1 (100) of the divided triangle as the side interpolation start vertex.
1) and the triangular triangle vertex 3 (1003) of the divided triangle as the edge interpolation end vertex, and the triangular edge 3 interpolator 805 sets the triangular triangle vertex 2 (1002) of the triangle divided as the edge interpolation start vertex and the edge. The triangular vertices 3 (1003) of the divided triangles are set as the interpolation end vertices.

Accordingly, the triangular side 1 interpolator 803 has a triangular side 1 (1004) of the divided triangle, and the triangular side 2 interpolator 804 has a triangular side 2 (100 of the divided triangle).
5), the triangular side 3 interpolating device 805 is set with the triangular side 3 (1006) of the divided triangle, and all sides of the triangle are interpolated.

Next, the contour generator 106 receives the triangle data determination signal 828 indicating that the triangle separation is completed, and receives the triangle side 1 interpolator 803 and the triangle side 2 interpolator 804.
Then, the next span transmission request signal 829, which is a triangle side interpolation control signal, is output to the triangle side 3 interpolator 805.

Next, the triangle side 1 interpolator 803 and the triangle side 3 interpolator 805 receive the next span transmission request signal 829 and advance the interpolation of the triangle side by one unit.
Generates the triangle side 1 linear interpolation data 824 which is the second triangle side interpolation coordinates, and the triangle side 3 interpolating device 805 generates the triangle side 3 linear interpolation data 826 which is the first triangle side interpolation coordinates.

Next, the interpolation data selection device 806 determines the triangular side 1
Triangle side 1 linear interpolation data 82 generated by the interpolation device 803
4 is selected to generate span end point 2 data 827 which is the span end point coordinate.

Next, the straight line drawing device 107 has span end point 2 data 827 which is span coordinate information forming a triangle and triangle side 3 linear interpolation data 8 which is span end point 1 coordinate data.
The memory write data signal 13 for interpolating the horizontal span 1103 based on 26 and writing it to the image memory 108.
Generates 0.

Next, the image memory 108 receives the memory write data signal 130 and writes the graphic pattern in the image storage area. The graphic pattern drawn in the image storage area generates a video signal 131 which is an image display signal in accordance with the display timing. Then, the display device 109 performs a display operation based on the video signal 131 generated by the image memory 108.

Next, when the triangle side 1 interpolator 803 completes the triangle side interpolation of the triangle side 1 (1004) of the divided triangle, the interpolation data selection device 806 causes the triangle side 2 interpolator 80 to operate.
The triangular side 2 linear interpolation data 825 generated by No. 4 is selected to generate span end point 2 data 827 which is the span end point coordinate. When the triangular side 2 interpolation device 804 completes the triangular side interpolation of the triangular side 2 (1005) of the divided triangle, it means that one triangle has been drawn, and the remaining triangles are drawn in the same manner. When you draw all the triangles that make up a polygon,
Finish drawing the polygon.

[0016]

As described above, the conventional drawing apparatus requires the triangle separation processing due to the function of the straight line drawing apparatus, and the separation requires the respective triangle drawing processing. In the drawing process, a triangle side determination process and a triangle side setting process for the triangle side interpolation device are performed. Therefore, performing double processing on the processing of the side unnecessary for the original polygonal display has been an obstacle for improving the drawing speed.

The present invention has been made to solve the above problems, and provides a polygon drawing method and a polygon drawing apparatus capable of continuously drawing polygons at high speed without dividing the polygon into triangles. The purpose is to

[0018]

A polygon drawing method and a polygon drawing apparatus according to the present invention include a polygon vertex register for temporarily storing beforehand polygon vertex data relating to a polygon to be drawn, and a predetermined polygon vertex data in the polygon vertex register. And a start point register for sequentially monitoring the polygon vertex data input for storage and determining and temporarily storing certain polygon vertex data to be the drawing start vertex. When,
A contour generating means for sequentially controlling the order of generating polygon contours; and a vertex address up counter for outputting to the polygon vertex register an address at which the next polygon vertex data is stored in the clockwise direction according to the polygon contours. , A vertex address down counter for outputting the address where the next polygon vertex data is stored in the counterclockwise direction to the polygon vertex register according to the contour of the polygon, and an address obtained by the vertex address adding means and the vertex address subtracting means Based on the polygon vertex data shown by, the interpolation means for interpolating the right-handed contour straight line and the left-handed contour straight line of the polygon respectively, and the end points of the right-handed contour straight line and the left-handed contour straight line of the polygon respectively obtained by the interpolation means And a straight line drawing means for drawing the polygon interpolation span. It is intended to.

With the above configuration, the interpolation of the clockwise polygon contour interpolation line, the interpolation of the counterclockwise polygon contour interpolation line, and the drawing of the polygon interpolation span are performed at the same time so that the contour indicated by the start point register follows the polygon contour. The polygon interpolation span can be drawn.

Therefore, according to the present invention, the polygon can be continuously drawn at high speed without dividing the polygon into triangles.

[0021]

With the above configuration, the interpolation of the clockwise polygon contour interpolation line, the interpolation of the counterclockwise polygon contour interpolation line, and the drawing of the polygon interpolation span are performed at the same time, so that the vertex indicated by the start point register is changed to the polygon contour. Polygon interpolation spans can be drawn along.

Therefore, according to the present invention, polygons can be continuously drawn at high speed without dividing the polygon into triangles.

[0023]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a polygon drawing apparatus according to an embodiment of the present invention. In FIG. 1, 101 is a vertex management device, 102 is an interpolation device, 103 is a vertex address up counter, 104 is a vertex address down counter, 105 is a polygon vertex register, and 106 is a polygon vertex register.
Is a contour generation device, 107 is a line drawing device, 108 is an image memory, 109 is a display device, and 110 is a start point register.

Regarding signals transmitted and received between these blocks, 121 is a polygon data control signal, 122 is a polygon vertex data signal, 123 is a polygon data confirmation signal, 124 is a vertex data 1 address signal, and 125 is a vertex data 1 data. Signal, 126 is vertex data 2 address signal, 127 is vertex data 2 data signal, 128 is span end point 1 vertex signal, 129 is span end point 2 vertex signal, 13
0 is a memory write data signal, 131 is a video signal, 13
Reference numeral 2 is a next vertex sending request signal, 133 is a polygon vertex data write signal, and 134 is a start point address signal.

FIG. 2 is a block diagram showing the configuration of the vertex management apparatus 101 of FIG. In the figure, it is composed of a latch element, is connected to a control bus line, and latches a control signal in the control bus line to obtain a polygon data confirmation signal 123 and a polygon vertex data write signal 133 from the polygon data control signal 121. .

FIG. 3 is a block diagram showing the configuration of the interpolation device 102 of FIG. In the figure, state transition circuits 102.
1 and a linear interpolation coordinate calculation element Q1003 and two D flip-flops. That is, the linear interpolation coordinate calculation element Q1003 calculates the linear interpolation coordinates based on the coordinate data of the initial vertex and the next vertex stored in the two D flip-flops. The state transition circuit 102.1 controls a start / stop sequence for the linear interpolation coordinate calculation element Q1003.

FIG. 4 is a block diagram showing the configuration of the vertex address up counter 103 and the vertex address down counter 104 of FIG. In the figure, the state transition circuit 10
It is composed of an up / down counter that is sequence-controlled by 3.1.

FIG. 5 shows the polygon vertex register 105 of FIG.
3 is a block diagram showing the configuration of FIG. In the figure, the register is composed of a multi-port S-RAM, and can temporarily store and read the address signals and data signals of a plurality of vertex data.

FIG. 6 is a block diagram showing the configuration of the contour generating device 106 shown in FIG. In the figure, it is composed of a coincidence circuit and a state transition circuit 106.1. The state transition circuit 106.1 sequentially controls the process of generating the contour, and the polygon data confirmation signals 123 or 142 and 14
3 is input, the next vertex sending request signal 132 is output, and the vertex data 1 address signal 124 and the vertex data 2 are output.
When the address signal 126 matches, the end signal returns to the idle state.

FIG. 7 is a block diagram showing the configuration of the straight line drawing device 107 of FIG. In the figure, the interpolation device 1 of FIG.
This is a configuration in which the D flip-flop element is removed from 02. That is, the linear interpolation coordinate calculation element Q1003 calculates linear interpolation coordinates from the span end point 1 vertex signal 128 and the span end point 2 vertex signal 129 obtained from the two interpolators 102. The state transition circuit 102.1 controls the start / stop of the linear interpolation coordinate calculation element Q1003.

FIG. 8 is a block diagram showing the structure of the starting point register 110 of FIG. In the figure, it is composed of two D flip-flops, one size comparator, and an AND gate. The Q terminal of the D flip-flop stores the minimum value input last time. The size comparator receives the new polygon vertex data signal 122, compares it with the previous Q value, and uses the true / false result as the AND gate input. Therefore, the latch signal is output only when the new minimum value is input, and the polygon vertex data write signal 133 is output.
Will be updated.

FIG. 9 is a diagram showing a polygon to be drawn,
Reference numeral 201 is a drawing target polygon, 202 is a drawing target polygon constituent vertex data 1, 203 is a drawing target polygon constituent vertex data 2, 204 is a drawing target polygon constituent vertex data 3, 205 is a drawing target polygon constituent vertex data 4, 20
Reference numeral 6 is the drawing target polygon constituent vertex data 5.

FIG. 10 is a diagram showing the contents of the polygon vertex register 105, and 301 is the polygon vertex register 10.
5, 302 is polygon configuration vertex data 1, 303
Is polygon vertex data 2, 304 is polygon vertex data 3, 305 is polygon vertex data 4, 306 is polygon vertex data 5 and 307 is polygon vertex data 6, 308
Polygon vertex data 7 and 309 are polygon vertex data 8
Is.

FIG. 11 is a diagram showing the generation of span end points. 401 is a polygon contour interpolation start vertex, 402 is a counterclockwise polygon contour interpolation continuation vertex, 403 is a clockwise polygon contour interpolation continuation vertex, and 404 is a polygon interpolation horizontal span. ,
Reference numeral 405 is a counterclockwise polygon contour interpolation straight line, and 406 is a clockwise polygon contour interpolation straight line.

That is, the line drawing device 107 causes the span end point 1 and the vertex signal 12 obtained from the two interpolating devices 102.
The polygon interpolation horizontal span 404 is drawn from 8 and the span end point 2 vertex signal 129.

In the example shown in the figure, the polygon contour interpolation start vertex 401 is shown at the top of the screen, but in the case of a CRT display, it is generally illustrated according to the convention of setting the upper left end as the screen origin. Therefore, it goes without saying that when another display device 109 is used, the display is performed according to the origin position suitable for the display device 109.

FIG. 12 is a diagram showing polygon interpolation using a polygon interpolation horizontal span. In the figure, a polygon interpolation horizontal span 404 (see FIG. 11) is stacked in the horizontal direction to complete the polygon drawing. 501 is a polygon interpolation step 1 area, 502 is a polygon interpolation step 2 area, and 503 is a polygon interpolation step 3 A region, 504 is a polygon interpolation process 4 region, 505 is an interpolation end contour end point of the polygon interpolation process 1, 506 is an interpolation end contour end point of the polygon interpolation process 2, 507 is a second counterclockwise polygon contour interpolation continuation vertex, and 508 is a polygon. The interpolation end contour end point in the interpolation process 3, 509 is the polygon contour interpolation end vertex, and 510 is the second
Left-handed polygon contour interpolation straight line, 511 is a second right-handed polygon contour interpolation straight line, and 512 is a third left-handed polygon contour interpolation straight line.

With respect to the polygon drawing method and polygon drawing apparatus according to the embodiment of the present invention configured as described above,
The drawing process and its operation will be described with reference to the drawings. First,
In order to draw the drawing target polygon 201 on the display device 109, the drawing target polygon constituent vertex data 1 (202), the drawing target polygon constituent vertex data 2 (203) and the drawing target polygon constituent vertex data are synchronized with the polygon data control signal 121. 3 (204), drawing target polygon constituent vertex data 4 (205) and drawing target polygon constituent vertex data 5 (206) are sequentially transferred to the polygon vertex register 105. The vertex management apparatus 101 receives the polygon data control signal 121 and receives the polygon vertex data write signal 13
Assert 3 to draw target polygon constituent vertex data 1
(202) is polygon vertex data 1 (302), drawing target polygon constituent vertex data 2 (203) is polygon vertex data 2 (303), and drawing target polygon constituent vertex data 3 (204) is polygon vertex data 3 (304). )
The drawing target polygon constituent vertex data 4 (205) is the polygon vertex data 4 (305), and the drawing target polygon constituent vertex data 5 (206) is the polygon vertex data 5 (3).
06). Also start point register 1
Reference numeral 10 sequentially compares the Y coordinate components of the polygon constituent vertex data to determine the interpolation start point. In this embodiment, since the polygon vertex data 1 (302) has the smallest Y component, the starting point register 110 outputs 0000 as the starting point address signal 134.

Next, when all the vertex data of the drawing target polygon 201 have been transferred, the vertex management device 101 indicates that the polygon data confirmation signal 12 indicating that all the vertex data forming the polygon has been input to the polygon vertex register 105.
Assert 3. The contour generation device 106 receives the polygon data confirmation signal 123 and sends a next vertex sending request signal 132 for requesting the vertex address up counter 103 and the vertex address down counter 104 to determine the vertex addresses of the start point and the end point. Assert.

The vertex address up counter 103 receives the next vertex sending request signal 132, and first receives the address indicated by the start point address signal 134 and the vertex data 1 address indicating the next address where the next vertex is stored. And signals 124 and. At the same time, the vertex address down counter 104 receives the next vertex sending request signal 132, and first receives the address indicated by the start point address signal 134 and the vertex data 2 address signal 126 indicating the previous address where the next vertex is stored. And output.

Specifically, in the example of FIG. 10, the vertex address up counter 103 outputs 0000 as the contour interpolation first polygon vertex register address, and outputs 0001 as the contour interpolation second polygon vertex register address. The vertex address down counter 104 outputs 0000 as the contour interpolation first polygon vertex register address, and outputs 0004 as the contour interpolation second polygon vertex register address.

Based on the vertex data 1 address signal 124 output from the vertex address up counter 103, the polygon vertex register 105 sends the clockwise start polygon constituent vertex data and the clockwise end polygon constituent vertex data to the vertex data 1 data signal 125. And the counterclockwise start polygon constituent vertex data and the counterclockwise end polygon constituent vertex data based on the vertex data 2 address signal 126 outputted from the vertex address down counter 104 as the vertex data 2 data signal 127. Thus, the interpolator 102 that receives the vertex data 1 data signal 125 interpolates the clockwise polygon outline. The interpolator 102 that receives the vertex data 2 data signal 127 interpolates the counterclockwise polygon outline.

In this way, the two interpolators 102 simultaneously perform the interpolation of the clockwise polygon contour interpolation straight line 406 and the counterclockwise polygon contour interpolation straight line 405 in synchronization with the Y coordinate (see FIG. 11), and the intermediate result is obtained. A polygon interpolation horizontal span 404 having a certain coordinate value as an end point is generated.

The straight line drawing device 107 receives the polygon interpolation horizontal span 404 and interpolates a horizontal straight line. In this embodiment, the interpolator 102 that receives the vertex data 2 data signal 127 reaches the final end point (see FIG. 11, counterclockwise polygon contour interpolation continuation vertex 402) first, and this interpolator 102 reaches the final vertex. Then, the vertex address down counter 104 increments by one.

When the vertex address down counter 104 advances by one, the vertex data 2 address signal 126 is updated, and the polygon vertex register 105 stores the two vertex coordinate data forming the next counterclockwise polygon contour in vertex data 2.
The data signal 127 is output. The interpolator 102 that receives the vertex data 2 data signal 127 continuously performs interpolation based on the vertex data 2 data signal 127. Therefore, the interpolation parameter of the counterclockwise polygon contour interpolation line 405 is updated, and the second counterclockwise polygon contour interpolation line 510 (see FIG. 12) is updated.
Interpolation proceeds in the direction of (see).

Since the interpolator 102 that receives the vertex data 1 data signal 125 and the interpolator 102 that receives the vertex data 2 data signal 127 are proceeding in synchronization with the Y coordinate, they continue from the polygon interpolation process 1 area 501. Then, the polygon interpolation proceeds to the polygon interpolation process 2 area 502.

When the interpolator 102 receiving the vertex data 1 data signal 125 finishes the interpolation of the clockwise polygon contour interpolation straight line 406, the vertex address up counter 103 is similarly incremented by one. Then, the linear parameter of the second clockwise polygon contour interpolation straight line 511, which is the next polygon contour constituent straight line, is read from the polygon vertex register 105 and set in the interpolation device 102 which receives the vertex data 1 data signal 125. In this way, the polygon interpolation process 3 area 503 is continuously interpolated.

Next, when the interpolator 102 which receives the vertex data 2 data signal 127 finishes the interpolation of the second counterclockwise polygon contour interpolation straight line 510, the vertex address down counter 104 is similarly incremented by one. Then, from the polygon vertex register 105, a third counterclockwise polygon contour interpolation straight line 5 which is the next polygon contour constituent straight line
The 12 straight line parameters are read out and set in the interpolator 102 which receives the vertex data 2 data signal 127. In this way, the polygon interpolation process 4 area 504 is continuously interpolated.

At this time, the vertex address up counter 1
Since the final vertex polygon vertex register address of 03 and the final vertex polygon vertex register address of the vertex address down counter 104 are equal, the contour generation device 106
Recognizes that the current contour interpolation is the final contour.

Next, since the final reaching end points of the interpolator 102 which receives the vertex data 1 data signal 125 and the interpolator 102 which receives the vertex data 2 data signal 127 are the same, it goes without saying that the second clockwise polygon contour interpolation is performed. Straight line 5
The interpolation of 11 and the third counterclockwise polygon contour interpolation straight line 512 ends at the same time, and the drawing of the drawing target polygon 201 ends.

As described above, according to this embodiment, interpolation is continuously performed without dividing the polygon into triangles, so that the polygon can be drawn at high speed.

Similarly, by replacing the Y-axis with the X-axis, the drawing apparatus is optimal as a vertical scanning type display device. FIG. 13 is a diagram showing the generation of the polygon interpolation vertical span at this time.

(Embodiment 2) Next, a polygon drawing apparatus according to another embodiment of the present invention will be described. The block configuration of the drawing apparatus of this embodiment is the same as that shown in FIG.
The only difference is that the start point register 110 has the following storage functions.

That is, the size of the polygon in the X-axis direction and the size of the polygon in the Y-axis direction are successively compared from the coordinate information of the polygon included in the polygon data control signal 121, whichever has the smallest axial component. Polygon vertex register 105
It has the function of storing the address of. Therefore, the block diagram shown in FIG. 8 is composed of the two blocks in FIG. 8 for the X coordinate and the Y coordinate. The action is X
It goes without saying that the coordinate and Y-coordinate operations are performed.

Therefore, the interpolator 102 determines the smaller axial direction of the polygon size stored in the starting point register 110 in the X-axis direction and the Y-axis direction as the optimum axial direction, and interpolates with respect to this optimum axial direction. To do. FIG. 14 shows this, and is a diagram showing the generation of the optimum direction polygon interpolation span. 404 is a polygon interpolation horizontal span, 601 is a polygon interpolation vertical span, 701 is a polygon horizontal total length,
Reference numeral 702 is the vertical total length of the polygon.

The operation of the polygon drawing apparatus according to another embodiment of the present invention constructed as above will be described with reference to the drawings.

First, in order to draw the drawing target polygon 201, in synchronization with the polygon data control signal 121,
Drawing target polygon constituent vertex data 1 (202), drawing target polygon constituent vertex data 2 (203), drawing target polygon constituent vertex data 3 (204), drawing target polygon constituent vertex data 4 (205) and drawing target polygon constituent vertex data 5 (206) sequentially in the polygon vertex register 105
Transfer to. The vertex management device 101 receives the polygon data control signal 121, and receives the polygon vertex data write signal 1
33 is asserted, and drawing target polygon constituent vertex data 1
(202) is polygon vertex data 1 (302), drawing target polygon constituent vertex data 2 (203) is polygon vertex data 2 (303), and drawing target polygon constituent vertex data 3 (204) is polygon vertex data 3 (304). )
The drawing target polygon constituent vertex data 4 (205) is the polygon vertex data 4 (305), and the drawing target polygon constituent vertex data 5 (206) is the polygon vertex data 5 (3).
06).

Further, the start point register 110 compares the X coordinate component and the Y coordinate component of the sequential polygon constituent vertex data to determine the interpolation start point in the X direction and the Y direction. At the same time, the horizontal total length 701 of the polygon and the vertical total length 702 of the polygon are obtained to generate a span in the longer direction of either length, and the spans are stacked in the shorter direction of the total length. By doing so, the number of times spans are generated can be reduced and the overall processing time can be shortened.

In this embodiment, the total polygon vertical length 702 is short (see FIG. 14), and the polygon vertex data 1 (302)
Is the minimum Y component (see FIG. 7), the start point register 110 outputs 0000 as the start point address signal 134.

As described above, the interpolation start point and the span generation direction are determined. Then, the subsequent polygon drawing process is realized in exactly the same way as described in the embodiment of the present invention.

In other words, the description until the drawing of the drawing target polygon 201 is completed after all the vertex data of the drawing target polygon 201 is transferred is exactly the same as that of the embodiment of the present invention. Omit it.

In order to match the expression of the origin of the display device 109 in one embodiment of the present invention, the magnitude comparator shown in FIG. 8 calculates the minimum value, and in the display examples of FIGS. Exemplifies the coordinate minimum value as the drawing start point. However, it goes without saying that the magnitude comparator calculates the maximum value and the coordinate maximum value is used as the drawing start point, which is obvious from the content of the present invention.

[0063]

As described above, according to the present embodiment, the processing of the side necessary for displaying the original polygon is directly and continuously performed without dividing the polygon into triangles. ,
A polygon can be drawn at high speed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a polygon drawing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of the vertex management device of FIG.

FIG. 3 is a block diagram showing the configuration of the interpolation device of FIG.

FIG. 4 is a block diagram showing a configuration of a vertex address up counter and a vertex address down counter of FIG.

5 is a block diagram showing the configuration of the polygon vertex register of FIG.

FIG. 6 is a block diagram showing the configuration of the contour generation device in FIG.

7 is a block diagram showing the configuration of the straight line drawing apparatus in FIG.

8 is a block diagram showing a configuration of a starting point register in FIG.

FIG. 9 shows a drawing target polygon

FIG. 10 is a diagram showing the contents of a polygon vertex register.

FIG. 11 is a diagram showing generation of span endpoints.

FIG. 12 is a diagram showing polygon interpolation using a polygon interpolation horizontal span.

FIG. 13 is a diagram showing generation of a polygon interpolation vertical span.

FIG. 14 is a diagram showing generation of an optimal direction polygon interpolation span.

FIG. 15 is a block diagram showing a configuration of a conventional drawing device.

FIG. 16 is a diagram showing a triangle separation process of a conventional drawing apparatus.

FIG. 17 is a diagram showing a triangle interpolation process by a span of a drawing apparatus of a conventional example.

FIG. 18 is a diagram showing a polygon interpolation process using a triangle in the drawing apparatus of the conventional example.

[Explanation of symbols]

 101 Vertex management device 102 Interpolation device 103 Vertex address up counter 104 Vertex address down counter 105 Polygon vertex register 106 Contour generation device 107 Linear drawing device 108 Image memory 109 Display device 110 Start point register 121 Polygon data control signal 122 Polygon vertex data signal 123 Polygon data confirmation signal 124 vertex data 1 address signal 125 vertex data 1 data signal 126 vertex data 2 address signal 127 vertex data 2 data signal 128 span end point 1 vertex signal 129 span end point 2 vertex signal 130 memory write data signal 131 video signal 132 next Vertex transmission request signal 133 Polygon vertex data writing signal 134 Start point address signal 201 Drawing target polygon 202 Drawing target polygon structure Vertex data 1 203 Rendering target polygon constituent vertex data 2 204 Rendering target polygon constituent vertex data 3 205 Rendering target polygon constituent vertex data 4 206 Rendering target polygon constituent vertex data 5 301 Contents of polygon vertex register 105 302 Polygon vertex data 1 303 Polygon vertex Data 2 304 Polygon vertex data 3 305 Polygon vertex data 4 306 Polygon vertex data 5 307 Polygon vertex data 6 308 Polygon vertex data 7 309 Polygon vertex data 8 401 Polygon contour interpolation start vertex 402 Left-hand polygon contour interpolation continuous vertex 403 Right-hand polygon Contour interpolation continuous vertex 404 Polygonal interpolation horizontal span 405 Left-handed polygon contour interpolation straight line 406 Right-handed polygon contour interpolation straight line 501 Polygon interpolation process 1 area 502 Polygon interpolation process 2 region 503 Polygon interpolation process 3 region 504 Polygon interpolation process 4 region 505 Polygon interpolation process 1 interpolation end contour end point 506 Polygon interpolation process 2 interpolation end contour end point 507 Second counterclockwise polygon contour interpolation continuation vertex 508 polygon Interpolation end contour end point of interpolation process 509 Polygon contour interpolation end vertex 510 Second left-handed polygon contour interpolation straight line 511 Second right-handed polygon contour interpolation straight line 512 Third left-handed polygon contour interpolation straight line 601 Polygon interpolation vertical span 701 Polygon horizontal total length 702 Polygon vertical total length

Claims (14)

[Claims] 1. A polygon vertex storage process of temporarily storing in advance polygon vertex data concerning a polygon to be drawn based on a predetermined vertex storage management procedure, and sequentially monitoring polygon vertex data input to store the polygon vertex data. , A starting point storage process that determines and stores certain polygon vertex data that should become the drawing start vertex, a contour generation process that sequentially generates polygon contours, and the next polygon vertex data in the clockwise direction according to the polygon contours A vertex address addition step of generating an address in which is stored, a vertex address subtraction step of generating an address in which the next polygon vertex data in the counterclockwise direction is stored according to the contour of the polygon, and the apex address addition step and Based on the polygon vertex data indicated by the address obtained by the vertex address subtraction process, The interpolation process of interpolating the right-handed contour straight line and the left-handed contour straight line of the polygon, and the polygon interpolation span with the end points of the right-handed contour straight line and the left-handed contour straight line of the polygon obtained in the interpolation process as both ends of the line segment. And a span drawing process for drawing a right-handed polygon contour interpolation straight line and a left-handed polygon contour interpolation straight line at the same time, and by executing the span drawing process each time, from the drawing start vertex. A polygon drawing method comprising drawing the polygon interpolation span along the contour of a polygon. 2. The starting point storing step includes a Y-axis component minimum value extracting step of comparing polygon vertex data and extracting polygon vertex data having the smallest Y-axis direction component. 2. The polygon interpolation spans are drawn in the Y-axis direction while performing linear interpolation in the X-axis direction along the polygon outline from the vertex of the minimum value of the Y-axis component indicated by the value extraction process. Polygon drawing method. 3. The starting point storing step includes a Y-axis component maximum value extracting step of comparing polygon vertex data and extracting polygon vertex data having a largest Y-axis direction component. 2. The polygon interpolation span is drawn in the Y-axis direction while performing linear interpolation in the X-axis direction along the polygon outline from the vertex of the maximum value of the Y-axis component indicated by the value extraction process. Polygon drawing method. 4. The starting point storing step includes an X-axis component minimum value extracting step of comparing polygon vertex data and extracting polygon vertex data having the smallest value in the X-axis direction component. 2. The polygon interpolation span is drawn in the X-axis direction while performing linear interpolation in the Y-axis direction along the polygon outline from the vertex of the minimum value of the X-axis component indicated by the value extraction process. Polygon drawing method. 5. The starting point storing step includes an X-axis component maximum value extracting step of comparing polygon vertex data and extracting polygon vertex data having a largest X-axis direction component. 2. The polygon interpolation span is drawn in the X-axis direction while performing linear interpolation in the Y-axis direction along the polygon contour from the vertex of the maximum value of the X-axis component indicated by the value extraction process. Polygon drawing method. 6. The starting point storing step compares the polygon vertex data, and extracts the polygon vertex data having the smallest values of the X-axis direction component and the Y-axis direction component, and a component minimum value extraction process; The total polygon length in the X-axis direction and the total polygon length in the Y-axis direction are compared with the total polygon X length calculation step in which the total polygon length in the Y-axis direction is calculated. And a shortest total length calculating step for determining a short axial direction of the polygon, the shortest total length calculating step along the contour of the polygon from the vertex where the X-axis direction component and the Y-axis direction component indicated by the component minimum value extraction process are minimum values. 2. The linear interpolation is performed in the other axial direction which is not determined by the above, and the drawing of the polygon interpolation span is stacked in the axial direction determined by the shortest total length calculation process. Polygon drawing method. 7. The starting point storing step compares the polygon vertex data and extracts the polygon vertex data having the largest values of the X-axis direction component and the Y-axis direction component. The total polygon length in the X-axis direction and the total polygon length in the Y-axis direction are compared with the total polygon X length calculation step in which the total polygon length in the Y-axis direction is calculated. And a shortest total length calculating step for determining the short axis direction of the shortest axial length, the shortest total length calculating step along the polygon contour from the vertex of the maximum value of the X-axis direction component and the Y-axis direction component indicated by the maximum component extraction 2. The linear interpolation is performed in the other axial direction which is not determined by the above, and the drawing of the polygon interpolation span is stacked in the axial direction determined by the shortest total length calculation process. Polygon drawing method. 8. A display device for displaying data, an image storage means for temporarily storing data to be displayed, and a straight line drawing means for calculating data of a straight line connecting two points from coordinate data of the two points. A polygon drawing apparatus having: a polygon vertex register for temporarily storing beforehand polygon vertex data relating to a polygon to be drawn; and a vertex managing means for managing to store the polygon vertex data in the polygon vertex register under a predetermined condition. , The polygon vertex data that is input to be stored is sequentially monitored, and the start point register that temporarily stores and temporarily stores certain polygon vertex data that should be the drawing start vertex, and the order in which the contours of polygons are generated are sequentially controlled. Contour generating means and the polygon contour data for the next polygon in the clockwise direction according to the contour of the polygon. And a vertex address addition means for outputting a reply to the polygon vertex register, and a vertex address subtraction for outputting an address storing the next polygon vertex data in the counterclockwise direction to the polygon vertex register according to the contour of the polygon. Means for interpolating a right-handed contour straight line and a left-handed contour straight line of the polygon based on the polygon vertex data indicated by the addresses obtained by the vertex address addition means and the vertex address subtraction means, and the interpolation means. And a straight line drawing means for drawing a polygon interpolation span with the end points of the right-handed contour straight line and the left-handed contour straight line of the respective polygons obtained as ends of the line segment. Simultaneous linear interpolation and the polygon interpolation span each time By performing drawing, from said drawing start vertex along the contour of a polygon polygon drawing apparatus characterized by drawing the polygon interpolation span. 9. The start point register includes Y-axis component minimum value extraction means for comparing polygon vertex data and extracting polygon vertex data having a smallest Y-axis direction component. 9. A polygon interpolation span is drawn in the Y-axis direction while performing linear interpolation in the X-axis direction along the polygon outline from the apex of the minimum Y-axis component indicated by the extracting means. Polygon drawing device. 10. The start point register includes Y-axis component maximum value extraction means for comparing polygon vertex data and extracting polygon vertex data having the largest Y-axis direction component. 9. The method according to claim 8, wherein linear interpolation is performed in the X-axis direction along the contour of the polygon from the vertex of the maximum value of the Y-axis component indicated by the extraction means, and the drawing of the polygon interpolation span is stacked in the Y-axis direction. Polygon drawing device. 11. The start point register includes X-axis component minimum value extraction means for comparing polygon vertex data and extracting polygon vertex data having the smallest X-axis direction component. 9. The polygon interpolation span is drawn in the X-axis direction while performing linear interpolation in the Y-axis direction along the polygon outline from the apex of the minimum X-axis component indicated by the extraction means. Polygon drawing device. 12. The starting point register includes X-axis component maximum value extraction means for comparing polygon vertex data and extracting polygon vertex data having the largest X-axis direction component. 9. The method according to claim 8, wherein linear interpolation is performed in the Y-axis direction along the contour of the polygon from the apex of the maximum value of the X-axis component indicated by the extracting means, and drawing of the polygon interpolation span is stacked in the X-axis direction. Polygon drawing device. 13. The starting point register compares the polygon vertex data and extracts the polygon vertex data having the smallest value in the X-axis direction component and the Y-axis direction component, and a component minimum value extracting means, and an X-axis direction. Polygon total length calculation means for calculating the total polygon length, polygon Y total length calculation means for calculating the total polygon length in the Y-axis direction, and total polygon length in the X-axis direction and total polygon length in the Y-axis direction A shortest total length calculating means for defining a short axis direction, and the shortest total length calculating means is arranged along the contour of the polygon from the vertex where the X-axis direction component and the Y-axis direction component indicated by the component minimum value extracting means are minimum values. 9. The linear interpolation is performed in the other axial direction which is not determined, and the drawing of the polygon interpolation span is stacked in the axial direction determined by the shortest total length calculation means. The polygon drawing device. 14. The maximum component value extracting means for comparing the polygon vertex data, and extracting the polygon vertex data having the largest values of the X-axis direction component and the Y-axis direction component, the start point register, and the X-axis direction. Polygon total length calculation means for calculating the total polygon length, polygon Y total length calculation means for calculating the total polygon length in the Y-axis direction, and total polygon length in the X-axis direction and total polygon length in the Y-axis direction A shortest total length calculating means for defining a short axial direction, wherein the shortest total length calculating means extends from the vertex of the maximum value of the X-axis direction component and the Y-axis direction component indicated by the component maximum value extracting means along the contour of the polygon. 9. The linear interpolation is performed in the other axial direction which is not determined, and the drawing of the polygon interpolation span is stacked in the axial direction determined by the shortest total length calculation means. The polygon drawing device.