JP2971765B2 - Polygon drawing method and polygon drawing device - Google Patents

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 device for drawing a polygon at high speed on a display device such as a CRT display used for computer graphics and the like.

[0002]

2. Description of the Related Art In the field of computer graphics, drawing apparatuses for drawing at high speed have come to be used. As a technique for improving the drawing speed of the drawing apparatus, a technique of drawing a polygon using the function of the drawing apparatus has been developed.

A method for drawing a polygon by a conventional drawing apparatus will be described below. FIG. 15 is a block diagram showing a configuration of a conventional drawing apparatus. In the figure, reference numeral 801 denotes a triangle separation device, 802 denotes a triangle vertex register, 803 denotes a triangle 1 interpolation device, 804 denotes a triangle 2 interpolation device, 805 denotes a triangle 3 interpolation device, 806 denotes an interpolation data selection device, and 82
1 is polygon vertex data, 822 is triangle vertex data,
823 is triangle end point data, 824 is triangle side 1 linear interpolation data, 825 is triangle side 2 linear interpolation data, 826 is triangle side 3 linear interpolation data, 827 is span end point 2 data,
828 is a triangle data decision signal, 829 is a next span transmission request signal, 106 is a contour generation device, 107 is a straight 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.

[0004] 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, where 201 is a drawing target polygon, 901 is a polygon separation triangle 1 and 902.
Is a polygon separation triangle 2, and 903 is a polygon separation triangle 3.

FIG. 17 is a diagram showing a triangular interpolation process based on a span of a conventional drawing apparatus. In FIG. 17, reference numeral 1001 denotes a triangular vertex 1 of a divided triangle, 1002 denotes a triangular vertex 2 of a divided triangle, and 1003 denotes a divided triangle. Triangle vertex 3, 1
004 is the triangle side 1 of the divided triangle, 1005 is the triangle side 2 of the divided triangle, 1006 is the triangle side 3 of the divided triangle, and 1007 is the triangle interpolation horizontal span of the divided triangle.

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

First, when the polygon vertex data 821 of the polygon 201 to be drawn is given to the triangle separating device 801, the triangle separating device 801 converts the polygon 201 to be drawn into a polygon separating triangle 1 (901) and a polygon separating triangle 2 (90).
2) and polygon separation triangle 3 (903), and triangle vertex data 822 as each triangle vertex data is generated in order.

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

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

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

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

Next, the interpolation data selection device 806 determines the triangular side 1
Triangular 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 coordinates.

Next, the straight line drawing device 107 performs span end point 2 data 827 as span coordinate information constituting a triangle and triangle side 3 linear interpolation data 8 as span end point 1 coordinate data.
The memory write data signal 13 for performing interpolation of the horizontal span 1103 on the basis of the
Generate 0.

Next, the image memory 108 receives the memory write data signal 130 and writes a figure pattern in the image storage area. The graphic pattern drawn in the image storage area generates a video signal 131 as 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 triangular side 1 interpolation unit 803 completes the triangular side interpolation of the triangular side 1 (1004) of the divided triangle, the interpolation data selecting unit 806 sets the triangular side 2 interpolation unit 80
4 is selected to generate span end point 2 data 827 which is the span end point coordinates. When the triangular side 2 interpolation device 804 completes the triangular side interpolation of the triangular side 2 (1005) of the divided triangle, one triangle is drawn, and the remaining triangles are drawn similarly. When you draw all the triangles that make up a polygon,
Finish drawing the polygon.

[0016]

As described above, the conventional drawing apparatus requires a triangle separation processing by 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 a triangle side interpolation device are performed. For this reason, performing double processing for processing unnecessary sides for displaying the original polygon has been an obstacle for improving the drawing speed.

SUMMARY OF THE INVENTION 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 separating polygons into triangles. The purpose is to:

[0018]

According to the present invention, there is provided a polygon drawing method and a polygon drawing apparatus, wherein a polygon vertex register for temporarily storing polygon vertex data relating to a polygon to be drawn in advance, and a polygon vertex register for storing polygon vertex data in a polygon vertex register. A vertex management means for performing management for storing the polygon vertex data, and a start point register for sequentially monitoring polygon vertex data input for storage and determining and temporarily storing certain polygon vertex data to be a drawing start vertex When,
Contour generation means for sequentially controlling the order in which polygon outlines are generated, and a drawing start vertex associated with a polygon outline.
And vertex address up counter that the next polygon vertex data in the clockwise direction determined by the outputs the address stored against polygon vertex registers, according to the outline of the polygon, counterclockwise which defines in conjunction with the drawing start vertex Based on the vertex address down counter that outputs the address at which the next polygon vertex data is stored in the direction to the polygon vertex register, and the polygon vertex data indicated by the address obtained by the vertex address adding means and the vertex address subtracting means, Interpolating means for interpolating the clockwise contour line and counterclockwise contour straight line of the polygon, respectively, and a straight line for drawing a polygon interpolation span having the endpoints of the clockwise contour line and counterclockwise contour straight line of the polygon obtained respectively by the interpolation means as line segments Drawing means.

According to the above configuration, each performed simultaneously and interpolation of the interpolation and counterclockwise polygon wheel KakuTadashi line clockwise polygon wheel KakuTadashi line by interpolation means, that the line drawing unit
By each time the polygon interpolation span line Ukoto drawing, it is possible to draw the polygonal interpolation span along the contour of the polygon from the vertex of the start point register.

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

[0021]

[0022]

[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 a configuration of a polygon drawing apparatus according to one 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, 106
Is a contour generating device, 107 is a straight 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 decision signal, 124 is vertex data 1 address signal, and 125 is vertex data 1 data Signal, 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
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 device 101 of FIG. In the figure, a polygon data decision signal 123 and a polygon vertex data write signal 133 are obtained from a polygon data control signal 121 by latching a control signal in the control bus line, which is constituted by a latch element and connected to a control bus line. .

FIG. 3 is a block diagram showing the configuration of the interpolation device 102 shown in FIG. In the figure, state transition circuits 102.
1 and a linear interpolation coordinate operation element Q1003 and two D flip-flops. That is, linear interpolation coordinates are calculated by the linear interpolation coordinate calculation element Q1003 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 and the like for the linear interpolation coordinate operation 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, a state transition circuit 10
It is composed of an up-down counter sequence-controlled by 3.1.

FIG. 5 shows the polygon vertex register 105 of FIG.
FIG. 3 is a block diagram showing the configuration of FIG. In the figure, a register is composed of a multi-port S-RAM, and can temporarily store and read 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, a match circuit and a state transition circuit 106.1 are provided. The state transition circuit 106. 1 sequentially controls the process of generating the contour.
3, the next vertex sending request signal 132 is output, and the vertex data 1 address signal 124 and the vertex data 2
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.
02 is a configuration in which the D flip-flop element is removed. That is, linear interpolation coordinates are calculated by the linear interpolation coordinate calculation element Q1003 from the span endpoint 1 vertex signal 128 and the span endpoint 2 vertex signal 129 obtained from the two interpolation devices 102. The state transition circuit 102.1 controls the start / stop of the linear interpolation coordinate operation element Q1003.

FIG. 8 is a block diagram showing the structure of the start point register 110 of FIG. In the figure, it is composed of two D flip-flops, one magnitude comparator and an AND gate. The Q terminal of the D flip-flop stores the previously input minimum value. The magnitude comparator compares the value of the previous Q with the input of the new polygon vertex data signal 122 and uses the result of the comparison as the input of the AND gate. Therefore, a latch signal is output only when a new minimum value is input, and the polygon vertex data write signal 133 is output.
Is updated.

FIG. 9 is a diagram showing polygons to be drawn.
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 denotes rendering target polygon constituent vertex data 5.

FIG. 10 is a diagram showing the contents of the polygon vertex register 105.
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, 307 is polygon vertex data 6, 308
Polygon vertex data 7 and 309 are polygon vertex data 8
It is.

FIG. 11 is a diagram showing the generation of the span end point, where 401 is the vertex at which the polygon contour interpolation is started, 402 is the vertex where the counterclockwise polygon contour interpolation is continued, 403 is the vertex where the clockwise polygon contour interpolation is continued, and 404 is the polygon interpolation horizontal span. ,
Reference numeral 405 denotes a counterclockwise polygon outline interpolation line, and reference numeral 406 denotes a clockwise polygon outline interpolation line.

That is, the span end point / vertex signal 12 obtained from the two interpolation units 102 by the straight line drawing unit 107
8 and the span end point 2 vertex signal 129, a polygon interpolation horizontal span 404 is drawn.

In the example shown in the figure, the polygon outline interpolation start vertex 401 is shown at the top of the screen. However, in general, in the case of a CRT display, it is exemplified according to a custom that the upper left end is set to the screen origin. Therefore, when another display device 109 is used, it is needless to say that the display is performed according to the origin position suitable for the display device 109.

FIG. 12 is a diagram showing polygon interpolation based on the polygon interpolation horizontal span. In the figure, polygon interpolation horizontal spans 404 (see FIG. 11) are stacked in the horizontal direction to complete polygon drawing, where 501 is a polygon interpolation process 1 region, 502 is a polygon interpolation process 2 region, and 503 is a polygon interpolation process 3 Area, 504 is a polygon interpolation process 4 area, 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 continuous vertex, and 508 is a polygon. The interpolation end contour end point of the interpolation step 3, 509 is the polygon contour interpolation end vertex, and 510 is the second
Is a second clockwise polygon contour interpolation straight line, and 511 is a third counterclockwise polygon contour interpolation straight line.

The polygon drawing method and the 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 render the rendering target polygon 201 on the display device 109, rendering target polygon configuration vertex data 1 (202), rendering target polygon configuration vertex data 2 (203), and rendering target polygon configuration vertex data are synchronized with the polygon data control signal 121. 3 (204), rendering target polygon configuration vertex data 4 (205), and rendering target polygon configuration vertex data 5 (206) are sequentially transferred to the polygon vertex register 105. The vertex management device 101 receives the polygon data control signal 121 and receives a polygon vertex data write signal 13.
Assert 3 and draw target polygon constituent vertex data 1
(202) is polygon vertex data 1 (302), rendering target polygon configuration vertex data 2 (203) is polygon vertex data 2 (303), and rendering target polygon configuration vertex data 3 (204) is polygon vertex data 3 (304). )
The rendering target polygon configuration vertex data 4 (205) is the polygon vertex data 4 (305), and the rendering target polygon configuration vertex data 5 (206) is the polygon vertex data 5 (3).
06). Start point register 1
Reference numeral 10 successively compares the Y coordinate components of the polygon-constituting vertex data to determine the interpolation start point. In this embodiment, since the polygon vertex data 1 (302) has the minimum Y component, the start point register 110 outputs 0000 as the start point address signal 134.

Next, when all of the vertex data of the polygon 201 to be drawn is transferred, the vertex management device 101 inputs a polygon data determination signal 12 indicating that all the vertex data constituting the polygon have been input to the polygon vertex register 105.
Assert 3. Receiving the polygon data determination signal 123, the contour generation device 106 sends a next vertex transmission request signal 132 for requesting the vertex address up counter 103 and the vertex address down counter 104 to determine the start and end vertex addresses. Assert.

Upon receiving the next vertex sending request signal 132, the vertex address up counter 103 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. The signal 124 is output. At the same time, upon receiving the next vertex sending request signal 132, the vertex address down counter 104 first receives the address indicated by the start point address signal 134 and the vertex data 2 address signal 126 indicating the address before the next vertex is stored. Is output.

More 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.

The polygon vertex register 105 converts the clockwise start polygon constituent vertex data and the clockwise end polygon constituent vertex data into a vertex data 1 data signal 125 based on the vertex data 1 address signal 124 output from the vertex address up counter 103. And outputs counterclockwise start polygon configuration vertex data and counterclockwise end polygon configuration vertex data 127 as vertex data 2 data signal 127 based on vertex data 2 address signal 126 output from vertex address down counter 104. Thus, the interpolation device 102 receiving the vertex data 1 data signal 125 interpolates the clockwise polygon outline. The interpolation device 102 that receives the vertex data 2 data signal 127 interpolates the counterclockwise polygon outline.

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

Receiving the polygon interpolation horizontal span 404, the straight line drawing device 107 performs horizontal straight line interpolation. In this embodiment, the interpolating device 102 that receives the vertex data 2 data signal 127 first reaches the final end point (see FIG. 11, the counterclockwise polygon contour interpolation continuing vertex 402), and the interpolating device 102 reaches the final vertex. Then, the vertex address down counter 104 advances by one count.

When the vertex address down counter 104 advances by one count, the vertex data 2 address signal 126 is updated, and the polygon vertex register 105 stores the two vertex coordinate data constituting the next counterclockwise polygon outline in the vertex data 2.
It is output as a data signal 127. The interpolation device 102 that receives the vertex data 2 data signal 127 continuously performs interpolation based on the vertex data 2 data signal 127. Accordingly, the interpolation parameters of the counterclockwise polygon contour interpolation straight line 405 are updated and the second counterclockwise polygon contour interpolation straight line 510 (FIG. 12)
The interpolation proceeds in the direction of (see).

Since the interpolating device 102 receiving the vertex data 1 data signal 125 and the interpolating device 102 receiving the vertex data 2 data signal 127 proceed in synchronization with the Y coordinate, the interpolating device 102 Then, polygon interpolation proceeds to the polygon interpolation process 2 area 502.

When the interpolating device 102 receiving the vertex data 1 data signal 125 completes the interpolation of the clockwise polygon contour interpolation straight line 406, the vertex address up counter 103 is similarly advanced by one. Then, a straight line parameter of a second clockwise polygon contour interpolation straight line 511 which is the next polygon contour constituting straight line is read from the polygon vertex register 105 and set to the interpolation device 102 which receives the vertex data 1 data signal 125. In this way, polygon interpolation in the polygon interpolation process 3 area 503 proceeds continuously.

Next, when the interpolating device 102 receiving the vertex data 2 data signal 127 completes the interpolation of the second counterclockwise polygon contour interpolation straight line 510, the vertex address down counter 104 is similarly advanced by one. Then, from the polygon vertex register 105, a third counterclockwise polygon contour interpolation straight line 5 which is the next polygon contour constituting straight line
Twelve straight line parameters are read out and set in the interpolating device 102 that receives the vertex data 2 data signal 127. Thus, the polygon interpolation in the polygon interpolation process 4 area 504 proceeds continuously.

At this time, the vertex address up counter 1
03, the final vertex polygon vertex register address of the vertex address down counter 104 is equal to the final vertex polygon vertex register address.
Recognizes that the current contour interpolation is the final contour.

Next, since the final arrival end points of the interpolating device 102 receiving the vertex data 1 data signal 125 and the interpolating device 102 receiving the vertex data 2 data signal 127 are the same, the second clockwise polygon contour interpolation is naturally performed. Straight line 5
The interpolation of the eleventh 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 the present embodiment, polygons can be drawn at high speed because interpolation is performed continuously without dividing polygons into triangles.

Similarly, by replacing the Y-axis with the X-axis, it becomes optimal as a drawing apparatus corresponding to a vertical scan type display device. FIG. 13 is a diagram showing 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 function.

That is, based on the coordinate information of the polygon included in the polygon data control signal 121, the size of the polygon in the X-axis direction and the size of the polygon in the Y-axis direction are sequentially compared, and any of the smaller axial components is the least. Polygon vertex register 105
Has the function of storing the address of the Therefore, the block diagram shown in FIG. 8 is composed of two blocks of FIG. 8 for the X coordinate and for the Y coordinate. Its operation is X
It goes without saying that the respective operations for the coordinate and the Y coordinate are performed.

Therefore, the interpolation device 102 sets the smaller one of the X-axis size and the Y-axis direction of the polygon stored in the start point register 110 as the optimum axis direction, and performs interpolation with respect to this optimum axis direction. I do. FIG. 14 is a diagram showing the above, and showing generation of the optimal 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 denotes the total vertical length of the polygon.

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

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

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

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

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

That is, the description from the transfer of all the vertex data of the polygon 201 to the completion of the rendering of the polygon 201 is exactly the same as that of the embodiment of the present invention. Omitted.

Also, in one embodiment of the present invention, in order to match the representation of the origin of the display device 109, the magnitude comparator shown in FIG. 8 calculates the minimum value. Has illustrated the minimum coordinate value as a drawing start point. However, even if the magnitude comparator calculates the maximum value and uses the coordinate maximum value as the drawing start point, it is obvious from the content of the present invention that the description is not repeated.

[0063]

As described above in detail, according to the present invention, a contour is directly calculated along a polygonal contour by a contour generating device and an interpolating device, and a straight line drawing device is calculated from a span end point during the calculation. Is used to draw the interpolation span. Therefore, without dividing the polygon into triangles, the direct processing of edges required to display the original polygon, and, can intends line interpolation continuously. Moreover, the X axis or Y axis
Regardless of the minimum or maximum value of the coordinates,
Furthermore, it is possible to interpolate the stack of drawings in the shortest overall length direction.
Therefore, regardless of the characteristics of the display device (for example, the direction of the scanning line),
Polygons can be drawn faster.

[Brief description of the 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 a configuration of a vertex management device in FIG. 1;

FIG. 3 is a block diagram showing a configuration of the interpolation device in FIG. 1;

FIG. 4 is a block diagram showing a configuration of a vertex address up counter and a vertex address down counter of FIG. 1;

FIG. 5 is a block diagram showing a configuration of a polygon vertex register of FIG. 1;

FIG. 6 is a block diagram showing a configuration of the contour generation device of FIG. 1;

FIG. 7 is a block diagram showing the configuration of the straight line drawing apparatus of FIG. 1;

FIG. 8 is a block diagram showing a configuration of a start point register in FIG. 1;

FIG. 9 is a view showing a polygon to be drawn;

FIG. 10 shows the contents of a polygon vertex register.

FIG. 11 is a diagram showing generation of a span endpoint;

FIG. 12 is a diagram showing polygon interpolation based on 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 apparatus.

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

FIG. 17 is a diagram showing a triangular interpolation process by a span in a conventional drawing apparatus.

FIG. 18 is a diagram showing a polygon interpolation process using triangles in a conventional drawing apparatus.

[Explanation of symbols]

 Reference Signs List 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 Line 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 determination 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 sending request signal 133 Polygon vertex data write signal 134 Start point address signal 201 Drawing target polygon 202 Drawing target polygon structure Vertex data 1 203 Drawing target polygon configuration vertex data 2 204 Drawing target polygon configuration vertex data 3 205 Drawing target polygon configuration vertex data 4 206 Drawing target polygon configuration 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 Counterclockwise polygon contour interpolation continuous vertex 403 Clockwise polygon Continuation interpolation vertex 404 Polygon interpolation horizontal span 405 Counterclockwise polygon contour interpolation straight line 406 Clockwise polygon contour interpolation straight line 501 Polygon interpolation process 1 area 502 Polygon interpolation process 2 area 503 Polygon interpolation process 3 area 504 Polygon interpolation process 4 area 505 Interpolation end contour end point of polygon interpolation step 1 506 Interpolation end contour end point of polygon interpolation step 2 507 Second counterclockwise polygon contour interpolation continuous vertex 508 Polygon Interpolation end contour end point of interpolation step 3 509 Polygon outline interpolation end vertex 510 Second counterclockwise polygon outline interpolation straight line 511 Second clockwise polygon outline interpolation straight line 512 Third counterclockwise polygon outline interpolation straight line 601 Polygon interpolation vertical span 701 Polygon horizontal total length 702 Polygon vertical total length

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G06F 15/72 G09G 5/36

Claims (12)

(57) [Claims] 1. A polygon vertex storage process for temporarily storing polygon vertex data relating to a polygon to be rendered in advance based on a predetermined vertex storage management procedure, and sequentially monitoring polygon vertex data input for storage . along with the stores you Ku defines a certain polygon vertex data to be a portrayal start vertex, the polygon vertex data
A polygon having the smallest value in the Y-axis direction component
A starting point storing step including a Y-axis component minimum value extracting step for extracting vertex data; a contour generating step for sequentially generating polygon outlines; and a drawing start vertex determined in accordance with the polygon outlines. A vertex address adding step of generating an address at which the next polygon vertex data in the clockwise direction is stored; and the next polygon vertex data in the counterclockwise direction defined in relation to the drawing start vertex according to the outline of the polygon. A vertex address subtraction step of generating a stored address; and a right-hand contour line and a left-hand contour line of the polygon based on polygon vertex data indicated by the address obtained by the vertex address addition step and the vertex address subtraction step. An interpolation process for interpolating each, and a clockwise contour straight line and a counterclockwise contour of the polygon obtained in the interpolation process, respectively. Having a span drawing step of drawing a polygon interpolation span with the end points of the straight line as both ends of the line segment, and simultaneously performing the interpolation steps of interpolating the clockwise polygon outline straight line and the counterclockwise polygon outline straight line, respectively.
By executing the span drawing process each time, the polygon interpolation span is drawn along the outline of the polygon from the drawing start vertex , and the Y-axis component minimum value extraction is performed.
From the vertex where the Y axis component shown in the output process is the minimum value,
Execute the span drawing process in the X-axis direction along the
A polygon drawing method , wherein the span drawing steps are stacked in an axial direction . 2. A polygon drawing method according to claim 1, wherein
Input for storing instead of starting point storing process
Monitors polygon vertex data sequentially and becomes the drawing start vertex
Determine and store the desired polygon vertex data and
To compare the polygon vertex data, Y-axis direction component is the most
Y-axis component for extracting polygon vertex data having a large value
Polygon with starting point storage process including min-max extraction process
It is a drawing method, where the clockwise polygon outline straight line interpolation and the counterclockwise polygon outline straight
Performing the interpolation process of performing line interpolation simultaneously,
By executing the span drawing process each time,
The polygon is drawn along the outline of the polygon from the drawing start vertex.
Draws the interpolation span, and extracts the maximum value of the Y-axis component.
From the vertex with the maximum value of the Y axis component shown in the output process,
Execute the span drawing process in the X-axis direction along the
Characterized by stacking the span drawing process in the axial direction
Polygon drawing how to. 3. The polygon drawing method according to claim 1, wherein
Input for storing instead of starting point storing process
Monitors polygon vertex data sequentially and becomes the drawing start vertex
Determine and store the desired polygon vertex data and
Then, compare the polygon vertex data, and
X-axis component for extracting polygon vertex data with small value
Polygon with starting point storage process including min-min extraction process
It is a drawing method, where the clockwise polygon outline straight line interpolation and the counterclockwise polygon outline straight
Performing the interpolation process of performing line interpolation simultaneously,
By executing the span drawing process each time,
The polygon is drawn along the outline of the polygon from the drawing start vertex.
Draw the interpolation span and extract the X-axis component minimum value.
From the vertex whose X-axis component shows the minimum value,
Execute the span drawing process in the Y-axis direction along the
Characterized by stacking the span drawing process in the axial direction
Polygon drawing how to. 4. A polygon drawing method according to claim 1, wherein:
Input for storing instead of starting point storing process
Monitors polygon vertex data sequentially and becomes the drawing start vertex
Determine and store the desired polygon vertex data and
Then, compare the polygon vertex data, and
X-axis component for extracting polygon vertex data with large value
Polygon with starting point storage process including min-max extraction process
It is a drawing method, where the clockwise polygon outline straight line interpolation and the counterclockwise polygon outline straight
Performing the interpolation process of performing line interpolation simultaneously,
Each time more to performing the span drawing process, before
The polygon is drawn along the outline of the polygon from the drawing start vertex.
Draw the interpolation span and extract the X-axis component maximum value.
From the vertex whose X-axis component indicates the maximum value,
Execute the span drawing process in the Y-axis direction along the
Characterized by stacking the span drawing process in the axial direction
Polygon drawing how. 5. The polygon drawing method according to claim 1, wherein
Input for storing instead of starting point storing process
Monitors polygon vertex data sequentially and becomes the drawing start vertex
Determine and store the desired polygon vertex data and
To compare the polygon vertex data, the component minimum value extraction process in which the X-axis direction component and the Y-axis direction component extracts the polygon vertex data having the smallest value, a polygon X total length for calculating the polygon entire length of the X-axis direction Calculating the total length of the polygon in the Y-axis direction; calculating the total length of the polygon in the Y-axis direction; and comparing the total length of the polygon in the X-axis direction and the total length of the polygon in the Y-axis direction to determine the shortest total length.
A polygon drawing method having a starting point storing step including
Te, clockwise polygon outline linear interpolation and counterclockwise polygon outline straight
Performing the interpolation process of performing line interpolation simultaneously,
By executing the span drawing process each time,
The polygon is drawn along the outline of the polygon from the drawing start vertex.
In addition to the drawing of the interpolation span, the X-axis direction component and the Y-axis direction component shown in the component minimum value extraction process are not determined in the shortest full length calculation process from the vertex of the minimum value along the polygon outline. polygon drawing method of executing the span drawing process in the axial direction, it characterized by stacking the span drawing process in order was axially front Symbol shortest total length calculation step constant. 6. A polygon drawing method according to claim 1, wherein:
Input for storing instead of starting point storing process
Monitors polygon vertex data sequentially and becomes the drawing start vertex
Determine and store the desired polygon vertex data and
To compare the polygon vertex data, the component maximum value extraction process in which the X-axis direction component and the Y-axis direction component extracts the polygon vertex data having the largest value, the polygon X total length for calculating the polygon entire length of the X-axis direction Calculating the total length of the polygon in the Y-axis direction; calculating the total length of the polygon in the Y-axis direction; and comparing the total length of the polygon in the X-axis direction and the total length of the polygon in the Y-axis direction to determine the shortest total length.
A polygon drawing method having a starting point storing step including
Te, clockwise polygon outline linear interpolation and counterclockwise polygon outline straight
Performing the interpolation process of performing line interpolation simultaneously,
By executing the span drawing process each time,
The polygon is drawn along the outline of the polygon from the drawing start vertex.
In addition to drawing the interpolation span, the X-axis component and the Y-axis component shown in the component maximum value extraction process are not determined in the shortest total length calculation process along the polygon outline from the maximum value vertex. polygon drawing method of executing the span drawing process in the axial direction, it characterized by stacking the span drawing process in order was axially front Symbol shortest total length calculation step constant. 7. A display device for displaying data, image storage means for temporarily storing data to be displayed, and straight line drawing means for calculating data of a straight line connecting two points from coordinate data of two points. A polygon vertex register for temporarily storing polygon vertex data relating to a polygon to be rendered in advance, and vertex management means for managing the polygon vertex data to be stored under predetermined conditions in the polygon vertex register. , sequentially monitors the polygon vertex data input to be stored therein, with temporarily store defines a certain polygon vertex data to the portrayal starting vertex, the polygon vertex data
Data with the smallest value in the Y-axis direction component.
Includes Y-axis component minimum value extraction means for extracting gon vertex data
A start point register, contour generation means for sequentially controlling the order in which polygon outlines are generated, and the next polygon vertex data in the clockwise direction defined in relation to the drawing start vertex according to the polygon outline. A vertex address adding means for outputting an address to the polygon vertex register, and an address at which the next polygon vertex data in the counterclockwise direction defined in relation to the drawing start vertex is stored according to the outline of the polygon. A vertex address subtraction means for outputting to the polygon vertex register; and a clockwise contour line and a counterclockwise contour straight line of the polygon based on polygon vertex data indicated by the addresses obtained by the vertex address addition means and the vertex address subtraction means. Interpolating means for interpolating each of the polygons, Line drawing means for drawing a polygon interpolation span with the end points of the circling contour straight line and the counterclockwise contour straight line as both ends of the line segment, wherein the interpolation means interpolates the clockwise polygon contour straight line and interpolates the counterclockwise polygon contour straight line. Are performed simultaneously,
By drawing the polygon interpolation span each time by the straight line drawing means, the polygon interpolation span is drawn along the polygon outline from the drawing start vertex.
At the same time, the Y-axis component minimum value is extracted by the straight line drawing means.
From the vertex whose Y-axis component indicated by the output means is the minimum value,
Draw the polygon interpolation span in the X-axis direction along the contour
Line and multiply the drawing of the polygon interpolation span in the Y-axis direction.
A polygon drawing device characterized by overlapping . 8. The polygon drawing apparatus according to claim 7, wherein:
Input to store instead of start point register
Monitors polygon vertex data sequentially and becomes the drawing start vertex
Predetermine polygon vertex data to be stored temporarily
With the polygon vertex data, and the component in the Y-axis direction is
Y for extracting polygon vertex data having the largest value
Multi-point with start point register including axis component maximum value extraction means
A polygon drawing device, comprising:
Interpolation of the surrounding polygon outline straight line is performed respectively at the same time,
Each time the polygon interpolation spa
By drawing a pattern, the polygon is drawn from the drawing start vertex.
Draw the polygon interpolation span along the outline of the gon
At the same time, the maximum value of the Y-axis component is extracted by the straight line drawing means.
From the vertex with the maximum value of the Y-axis component indicated by the output means,
Draw the polygon interpolation span in the X-axis direction along the contour
Line and multiply the drawing of the polygon interpolation span in the Y-axis direction.
Polygon drawing device, characterized in that overlapping seen. 9. The polygon drawing apparatus according to claim 7, wherein
Input to store instead of start point register
Monitors polygon vertex data sequentially and becomes the drawing start vertex
Predetermine polygon vertex data to be stored temporarily
Together, to compare the polygon vertex data, the X-axis direction component
X for extracting polygon vertex data having the smallest value
Multi-point with start point register including axis component minimum value extraction means
A polygon drawing device, comprising:
Interpolation of the surrounding polygon outline straight line is performed respectively at the same time,
Each time the polygon interpolation spa
By drawing a pattern, the polygon is drawn from the drawing start vertex.
Draw the polygon interpolation span along the outline of the gon
At the same time, the X-axis component minimum value is extracted by the straight line drawing means.
From the vertex whose X-axis component indicated by the output means is the minimum value,
Draw the polygon interpolation span in the Y-axis direction along the contour
Line and multiply the drawing of the polygon interpolation span in the X-axis direction.
Polygon drawing device, characterized in that overlapping seen. 10. A polygon drawing apparatus according to claim 7, wherein
Instead of the start point register,
Monitor the polygon vertex data to be
Determine the polygon vertex data to be stored and temporarily store
At the same time, the polygon vertex data is compared and the X-axis direction
Extract the polygon vertex data with the largest value for the minute
Has a starting point register including an X-axis component maximum value extracting means.
A polygon drawing device, comprising:
Interpolation of the surrounding polygon outline straight line is performed respectively at the same time,
Each time the polygon interpolation spa
By drawing a pattern, the polygon is drawn from the drawing start vertex.
Draw the polygon interpolation span along the outline of the gon
At the same time, the X-axis component maximum value is extracted by the straight line drawing means.
From the vertex whose X axis component indicated by the output means is the maximum value,
Draw the polygon interpolation span in the Y-axis direction along the contour
Line and multiply the drawing of the polygon interpolation span in the X-axis direction.
Polygon drawing device, characterized in that overlapping seen. 11. A polygon drawing apparatus according to claim 7, wherein :
Instead of the start point register,
Monitor the polygon vertex data to be
Determine the polygon vertex data to be stored and temporarily store
In addition, a component minimum value extracting means for comparing polygon vertex data and extracting polygon vertex data having the smallest value in the X-axis direction component and the Y-axis direction component, and a polygon X for calculating the total length of the polygon in the X-axis direction A total length calculating means, a polygon Y total length calculating means for calculating the total length of the polygon in the Y-axis direction, a shortest total length calculation for determining an axial direction having a shorter total length by comparing the total length of the polygon in the X-axis direction and the total length of the polygon in the Y-axis direction A polygon drawing device having a starting point register including:
Te, interpolation and left clockwise polygon outline linear by said interpolation means
Interpolation of the surrounding polygon outline straight line is performed respectively at the same time,
Each time the polygon interpolation spa
By drawing a pattern, the polygon is drawn from the drawing start vertex.
Draw the polygon interpolation span along the outline of the gon
At the same time, the X-axis direction component and the Y-axis direction component indicated by the component minimum value extracting unit extend along the outline of the polygon from the vertex of the minimum value and are not determined by the straight line drawing unit by the shortest total length calculating unit. in the axial direction becomes line drawing of the polygon interpolation span shall be the previous SL wherein the stacking drawing of the polygon interpolation span in the axial direction defined by the shortest total length calculating means polygon drawing device. 12. A polygon drawing apparatus according to claim 7, wherein :
Instead of the start point register,
Monitor the polygon vertex data to be
Determine the polygon vertex data to be stored and temporarily store
In addition, a component maximum value extracting means for comparing polygon vertex data and extracting polygon vertex data having the largest value in the X-axis direction component and the Y-axis direction component, and a polygon X for calculating the total length of the polygon in the X-axis direction A total length calculating means, a polygon Y total length calculating means for calculating the total length of the polygon in the Y-axis direction, a shortest total length calculation for determining an axial direction having a shorter total length by comparing the total length of the polygon in the X-axis direction and the total length of the polygon in the Y-axis direction A polygon drawing device having a starting point register including:
Te, interpolation and left clockwise polygon outline linear by said interpolation means
Interpolation of the surrounding polygon outline straight line is performed respectively at the same time,
Each time the polygon interpolation spa
By drawing a pattern, the polygon is drawn from the drawing start vertex.
Draw the polygon interpolation span along the outline of the gon
At the same time, the X-axis direction component and the Y-axis direction component indicated by the component maximum value extracting unit are not determined by the straight line drawing unit by the shortest total length calculating unit along the outline of the polygon from the vertex of the maximum value. in the axial direction becomes line drawing of the polygon interpolation span shall be the previous SL wherein the stacking drawing of the polygon interpolation span in the axial direction defined by the shortest total length calculating means polygon drawing device.