JPH01175087A - Image display device - Google Patents

Abstract

PURPOSE:To rapidly draw a drawing vector pattern by independently preparing a vector drawing memory in addition to a display memory and copying a repeated drawn pattern written in the vector drawing memory to a display memory. CONSTITUTION:A vector generating circuit 3 calculates increments in the X and Y directions from applied start point and end point coordinate values. While successively adding the increments to the start point coordinate values, a vector drawing coordinate value is generated and written in the vector drawing memory 4. At the time of deciding that a drawing vector to be calculated and written against the drawing vector written in the memory 4 is a repeated drawing pattern, a decision circuit 2 writes the drawing pattern stored in the memory 4 so as to copy it in the display memory 5.

Description

[Detailed Description of the Invention] (Summary) Regarding an image display device that draws and displays vectors, a vector drawing memory is separately prepared in addition to the display memory, and a repeated drawing pattern written in the memory is copied to the display memory. The hector pattern can be created at high speed by 11N.
A vector generation circuit that sequentially generates drawing point addresses corresponding to specified start point coordinate values and end point coordinate values and writes them into vector drawing memory, and a drawing pattern generated by this vector generation circuit are repeated. and a determination circuit that determines whether or not the drawing pattern is repetitive, and if the determination circuit determines that the drawing pattern is repetitive, the calculation of the drawing point address is stopped and the repetition written in the vector drawing memory is A rectangular area is configured to be copied into a display memory 8 times.

[Industrial application field]

The present invention relates to an image display device that draws and displays vectors. Image display devices used in CAD and the like are desired to have improved vector drawing speed in order to improve responsiveness.

[Problems to be solved by conventional technology and invention] Conventionally,
Vector drawing on an image display device involves calculating increments in the X and Y directions from the starting point coordinate value A and ending point coordinate value B of a given vector, as shown in FIG.
While adding these increments to the starting point coordinate value A, vector drawing coordinate values N1, N2, . . . , N1 are sequentially determined, and drawing is performed from the starting point to the ending point. This method has a problem in that the longer the vector to be drawn, the longer the drawing time.

To solve this problem, when a long vector drawing pattern becomes a certain repeating pattern, coordinate calculation is stopped and the rectangular area where the previous drawing pattern exists is used as shown in Figure 3 (b). There is a method of sequentially copying (the lower left rectangular area indicated using a dashed line). but,
If a rectangular area in which a repeated drawing pattern exists is copied sequentially, if you overwrite a certain image, for example, the third
Figure (B) When a figure is overwritten in such a way that it intrudes into the rectangular area surrounded by the dotted line at the bottom left of the figure, the overwritten rectangular area is sequentially copied (and the unnecessary figure b1
1. , +t, b, 11'', and there was a problem that only the desired 11δ image pattern could not be displayed.

The present invention aims to draw a hector pattern at high speed by preparing a vector drawing memory separately in addition to the display memory and copying the repeated drawing pattern written in the vector drawing memory to the display memory.

[Means for solving problems]

Means for solving the problem will be explained with reference to FIG.

In FIG. 1, the vector generation circuit 3 calculates increments in the X and Y directions from the given start point coordinate values and end point coordinate values, and sequentially generates vector drawing coordinate values while adding these increments to the start point coordinate values. It is something to do.

The determination circuit 2 determines whether the drawing pattern to be generated by the vector generation circuit 3 is a repetitive drawing pattern.

The vector drawing memory 4 sequentially writes vectors into positions corresponding to the vector drawing coordinate values generated by the vector generation circuit 3.

The display memory 5 is used to write vectors and the like to be displayed on the display section 6.

[Effect]

As shown in FIG. 1, in the present invention, a vector generation circuit 3 calculates increments in the X direction and Y direction from given start point coordinate values and end point coordinate values, and sequentially adds these increments to the start point coordinate values to generate a vector. Generate drawing coordinate values and create vector BT
ii! ii) is written to the memory 4, and the determination circuit 2 calculates the drawing vector written in this vector drawing memory 4. If it is determined that the drawing vector to be written is a repeated drawing pattern, the vector generation circuit 3 calculates The drawing pattern stored in the vector drawing memory 4 is written into the display memory 5 in such a manner that it is copied.

Therefore, there is no need for the vector generation circuit 3 to calculate vector coordinate values for the repeated drawing pattern, and the drawing pattern written in the vector If image memory 4 can be written in a manner of copying it to the display memory 5, which is fast. It becomes possible to perform vector drawing.

〔Example〕

Next, the configuration and operation of one embodiment of the present invention will be explained in detail using FIGS. 1 and 2.

In FIG. 1, a control circuit 1 performs various controls such as notifying a starting point coordinate value and an ending point coordinate value to a vector generating circuit 3 and indicating that vector drawing should be performed in a vector drawing memory 4. be.

The determination circuit 2 determines whether the drawing pattern to be written into the vector drawing memory 4 by the vector generation circuit 3 is a repeated drawing pattern.

The vector generation circuit 3 calculates increments in the X and Y directions from the given start point coordinate values and end point coordinate values, and while adding these increments to the start point coordinate values, sequentially generates vector drawing coordinate values and stores them in the vector drawing memory 4. It is something to write inside.

The vector drawing memory 4 is newly provided according to the present invention, and is used to write the drawing vectors generated by the vector generation circuit 3. If the determination circuit 2 determines that the pattern is a repetitive drawing pattern, the rectangular area in the vector drawing memory 4 in which the repetitive drawing pattern exists is written in the display memory 5 in such a manner that it is copied. This makes it possible to write only a desired drawing vector extremely quickly, compared to writing drawing vectors by sequentially calculating them using the vector generation circuit 3.

The display memory 5 is used to write a drawing pattern to be displayed on the display section 6.

The display unit 6 is a display that displays the drawing pattern written in the display memory 5.

Next, the operation of the configuration shown in FIG. 1 will be explained in detail using FIG. FIG. 2(a) shows the drawing vector written in the display memory 5 and displayed on the display unit 6, and FIG. 2(b) shows the vector drawing coordinate value N+ generated by the vector generation circuit 3.
A drawing vector generated by loading Nz, Ns, and Na into the vector drawing memory 4 is shown.

In FIG. 2(b), the vector generation circuit 3 in FIG.
Calculate the increments in the X and Y directions from the given starting point coordinate value A and ending point coordinate value B, and convert this increment to the starting point coordinate value A.
Vector drawing coordinate values N1, N! generated by sequentially adding to N!
, N1, and N4 are written as shown. At this time, the information is also written into the display memory 5 as shown by the line t1 at one point in the figure.

These vector drawing coordinate values Nl, Ng, Ns, N
If the drawing pattern drawn by , t is the same as the drawing pattern to be drawn next and is determined by the judgment circuit 2 in FIG. 1 to be a repeated drawing pattern, the calculation by the vector generation circuit 3 is stopped. Then, as shown in the rectangular area surrounded by dotted lines in FIG. 2(a), the drawing pattern written in the vector drawing memory 4 in FIG. 2(b), which is this repeated drawing pattern, is copied. The coordinates are sequentially copied into the display memory 5 in this manner until the end point coordinate value B is reached.

As described above, the vector drawing memory 4 writes only the vector drawing coordinate values calculated by the vector generation circuit 3.
is newly provided, and when a repeated drawing pattern occurs, Mr. B copies the drawing vector read out from this vector drawing memory 4 and writes it to the display memory 5, thereby making it possible to quickly draw only the repeated drawing pattern. It becomes possible.

〔Effect of the invention〕

As explained above, according to the present invention, a vector drawing memory 4 is newly provided in which the vector drawing coordinate values calculated by the vector generation circuit 3 are written, and when a repeated drawing pattern appears, the lu in this vector drawing memory 4 is Since the configuration is such that the image pattern is written to the display memory 5 and drawn in a manner of copying it, there is no need for the vector generation circuit 3 to repeatedly calculate vector coordinate values for the repeated drawing pattern. It becomes possible to write in such a manner that only the drawing pattern is copied, and vector drawing can be performed at high speed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of the present invention, and FIG. 3 is an explanatory diagram of the prior art. In the figure, 2 represents a determination circuit, 3 represents a vector generation circuit, 4 represents a vector drawing memory, 5 represents a display memory, and 6 represents a display section.

Claims (1)

[Claims] In an image display device that draws and displays vectors, a vector generation circuit sequentially generates drawing point addresses corresponding to specified starting point coordinate values and ending point coordinate values and writes them into a vector drawing memory (4). (3) and a determination circuit (2) for determining whether or not the drawing pattern generated by the vector generation circuit (3) is repetitive; When it is determined that, the drawing point address calculation is stopped and the repeating rectangular area written in the vector drawing memory (4) is written in such a manner that it is copied to the display memory (5). An image display device characterized by: