JPH0620057A - Graphic generator - Google Patents

Abstract

PURPOSE:To realize the graphic generator which is capable of anti-aliasing processing simultaneous with plotting and does not generate any unnatural graphics even at the time of overlap of loca. CONSTITUTION:This graphic generator is provided with a transformation and conversion circuit part which converts input graphic data to graphic information by geometrical transformation, a gradation setting circuit 3 which gives such gradation that the luminance is different between the center picture element and peripheral picture elements, a transform operation input circuit 4 which designates the classification and the extent of geometrical transformation and the gradation, a locus generator 11 which generates a locus signal to continuously give coordinates of positions of fundamental graphics stored in a fundamental graphic memory 5, a frame memory write circuit 9 which writes fundamental graphics in a frame memory 7 where fundamental graphic on the locus are held, and an address generating circuit 10 which calculates the address of a frame memory 7 determined by the locus signal and sends the read address and the write address to the fundamental graphic memory 5 and the frame memory 7 respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a figure generating device for generating a desired figure by preparing a plurality of digitized basic figures and repeatedly drawing them in a frame memory along a trajectory. is there.

[0002]

2. Description of the Related Art An example of drawing a wide curve in a conventional graphic generator will be described below with reference to the drawings. FIG. 4 shows a block diagram of a main part of a conventional graphic generator.

In FIG. 4, reference numeral 1 is a figure input device, for example, a tablet, a mouse or the like is used for its purpose, and a user inputs a sequence of points on a contour line and coordinates of one point inside. The input contour information is stored in the contour memory 2 and written into the corresponding position of the frame memory 4 through the control circuit 3. After that, the control circuit 3 gives the filling device 5 a command of the filling operation and the coordinates of one internal point stored in the contour memory 2. The filling device 5 starts filling while watching the contents of the frame memory 4 from the received coordinates. The internal texture is filled according to the contents of the pattern memory 6 holding the fill pattern. Instead of referring to the frame memory for filling, there is a method of filling by considering it as a geometrical structure of the contour line shape. In that case, the structure of the filling device is different from that of the filling device 5.

As another conventional example, FIG. 6 shows a block diagram of a main part thereof. In FIG. 6, the coordinates of the center line are input from the figure input device 1, and the output is connected to the contour generating device 2 to automatically obtain the contour line. A contour manipulating circuit 3 for specifying the vertical distance between the center line and the contour line and the shape of the end point is connected to the input of the contour generating device 2 and determines the shape of the contour line when generating the contour line. The generated contour line is stored in the contour memory 4, and the control circuit 5 activates the filling device 7 and refers to the pattern memory 8 to start filling the frame memory 6.

Further, as another conventional example, the principle is shown in FIGS. 8 and 9. FIG. 8 shows a method of drawing a number of lines corresponding to the width parallel to the center line, and FIG. 9 shows a method of dragging a line segment corresponding to the width in the direction perpendicular to the center line along the locus of the center line.

[0006]

However, in the configuration of FIG. 4, a great deal of time and labor is spent in the process of the user inputting the contour line, which is caused when the center line is input as shown in FIG. Is more than double. Further, when the configuration of FIG. 6 is adopted, in the contour generating device 2, for example, when a contour line of a curved line in which the center line is complicatedly bent as shown in FIG. Become. Further, if it is desired to change the shape of the end points, special processing must be performed. The method shown in FIGS. 8 and 9 has a drawback in that a blank can be formed unless the interval for drawing parallel lines is made fine. Further, the shape of the end point needs to be specially processed and created.
In the above method, since the drawing speed is adjusted and the solid line is changed to the dotted line, careful consideration is required, and the processing method loses uniformity and the apparatus becomes complicated. In addition, the jaggies issue must be treated separately.

Even when the basic figure has a gradation in which the brightness of the central pixel is different from that of the peripheral pixels, all the parts of the basic figure such as when the distance between the positions where the basic figure is placed on the locus is small or when they intersect. When you write, the intended trajectory does not appear, and the effect of antialiasing does not appear significantly.

In view of the above point, an object of the present invention is to provide a graphic generator capable of performing anti-aliasing processing at the same time as drawing and not generating an unnatural graphic even when loci overlap.

[0009]

In order to achieve the above object, the present invention has a transformation conversion circuit section for subjecting digitized input figure data to a geometric transformation to transform it into figure information, and a luminance of a central pixel and peripheral pixels. The input graphic data has a gradation setting circuit section for giving different gradations, a transformation operation input circuit for designating the type and amount of geometric deformation of the input graphic data, and the gradation of the input graphic data. A graphic deforming device for performing geometrical transformation and gradation setting, a basic graphic memory for storing a basic graphic output from the graphic deforming device and having different gradations in brightness between peripheral pixels and central pixel, and the basic graphic A locus generator that generates a locus signal that continuously gives the coordinates of the position, a frame memory that holds the basic figure on the locus, and a frame memo that writes the basic figure in the frame memory. A write circuit and an address generation circuit for calculating an address of the frame memory determined from the trajectory signal and sending a read address signal to the basic graphic memory and a write address signal to the frame memory. .

[0010]

According to the present invention, the brightness of the peripheral pixels changes from the brightness of the central pixel of the basic graphic to the brightness of the pixel of the background frame memory according to the distance from the central pixel of the basic graphic. By using a basic figure having gradations with different brightness in the peripheral pixels and the central pixel, the basic figure is arranged on the locus and at the same time a jagged figure is displayed, and further, a plurality of the basic figures are displayed according to the locus. When writing to the frame memory, if the basic figures partially overlap each other, the frame memory write control circuit causes the brightness of the pixel to be written in the basic figure to be on the frame memory at the writing position. If the brightness of the pixel at the center of the basic graphic is closer than the brightness of the pixel, the basic graphic is written to the frame memory. Te, it is possible to generate a jaggy of balanced figure.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a main part of a graphic generation device according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 is a graphic transformation device, which is, for example, a transformation conversion circuit section 2 for geometrically transforming a digitized vector type input figure to convert it into dot type graphic information, and a central pixel. A gradation setting circuit section 3 that gives gradations with different brightness of peripheral pixels, and a modification operation input circuit 4. The transformation conversion circuit unit 2 is created by an adder, a multiplier, etc., the gradation setting circuit unit 3 has a filter inserted, and an arithmetic unit for randomly adding a change 5 to the density at each point is added. It may have been done. Graphic transformation device 1
The setting values required for the transformation conversion circuit section 2 and the gradation setting circuit section 3 are input through the transformation operation input circuit 4.

Reference numeral 5 is a basic figure memory for storing a plurality of basic figures output from the figure deforming apparatus 1, 6 is a basic figure instruction circuit for selecting one of the basic figures in the basic figure memory 5, and 8 is a frame. A frame memory writing circuit attached to the memory 7, a frame memory writing control circuit 9 for controlling the frame memory writing circuit 8, and a locus generator 11
An address generating circuit for receiving a locus signal of the output of (1) and calculating a read address to the basic figure memory 5 and a write address to the frame memory writing circuit 8, and 11 for calculating the position of each point on the locus of an arbitrary figure. The locus generating device 12 is included in the locus generating device 11, and selects a type of locus by giving an instruction signal, or generates a locus signal of a position in the address generating circuit 10 at an arbitrary time interval or distance. This is a control input circuit.

The operation of the present embodiment configured as described above will be described. First, a transformation is given from the transformation operation input circuit 4 to geometrically transform an input figure to convert it into dot type figure information. The conversion and the gradation setting in which the brightness of the central pixel and the peripheral pixel are different are performed. Note that, for example, when a dot-type graphic having gradation is input, the deformation conversion circuit unit 2 and the gradation are changed according to the input graphic, such as setting the deformation amount to 0 and changing the gradation to 0 so that no operation is performed. It is also possible to prevent the setting circuit unit 3 from operating.

Next, the basic graphic memory 5 stores a plurality of basic graphics output from the graphic transformation device 1. The basic figure designating circuit 6 in the basic figure memory 5 selects one of them and outputs it to the frame memory writing circuit 8 attached to the frame memory 7. The frame memory writing circuit 8 writes a basic figure in the frame memory 7. The frame memory write control circuit 9 controls whether or not the frame memory write circuit 8 writes a basic figure in the frame memory 7 on a pixel-by-pixel basis. The frame memory write control circuit 9 can instruct whether to operate from the outside.

The basic figure designating circuit 6 includes a basic figure memory 5
The read address and the size of one figure are given, and a different basic figure is selected every time each point on the path is determined in synchronization with the path generator 11, and a visually distinctive effect is obtained. .

The locus generator 11 calculates the position of each point on the locus of an arbitrary figure. The locus signal output from the locus generating device 11 is sent to the basic figure memory 5 and the frame memory writing circuit 8 through the address generating circuit 10. The locus control input circuit 12 included in the locus generation device 11 selects the type of locus by giving an instruction signal, and causes the address generation circuit 10 to generate a locus signal of a position at an arbitrary time interval or distance.

For example, if the distance is larger than that of the solid line, a dotted line can be obtained, or if the distance is changed, a line type such as a one-dot chain line can be obtained. By increasing the time interval, the order of graphic generation is displayed in an easy-to-understand manner.

The address generation circuit 10 is used for the locus generation device 1
1 shown by the basic figure designating circuit 6
The read address of the basic graphic memory 5 is calculated from the address and the size of the basic graphic, the write address of the frame memory 7 is calculated, and the write address is sent to each of them synchronously for control. A plurality of basic figures repeatedly drawn in the frame memory 7 sequentially construct given figures. The process can be confirmed by a display device connected to the frame memory 7. With such a configuration, the brightness of the central pixel of the basic graphic and the brightness of the peripheral pixels, and the brightness of the background pixels surrounding the basic graphic in the pixels of the frame memory 7 are the gradations. By selecting the basic figure in which the brightness gradations of the central pixel and peripheral pixels of the basic figure are set so as to change gradually or gradually,
It is possible to generate an arbitrary figure with various expressions and high quality by performing anti-aliasing processing simultaneously with drawing.

In the case of using a graphic having different brightness for the central pixel and the peripheral pixels, which are filtered on the basic graphic, for example, when a straight line is considered, the gradation degree of the pixel on the basic graphic is the same as that of the corresponding pixel on the frame memory. If the pixel is larger than the gradient, the pixel is written in the frame memory, and the gradient gradually changes from the central portion of the curve toward the end, resulting in a noticeable unnaturalness at the boundary between the curve and the background. It's less and looks smooth, so you'll already be able to get rid of jaggies when writing to the frame memory.

For example, the figure of FIG. 2A becomes as shown in FIG. Note that FIG. 2C shows a basic figure having gradation. This is the case where the gradation of the pixel at the center of the basic figure is higher than the gradation of the pixel of the background frame memory when writing a straight line. In the opposite case, the method of changing the gradation of the basic figure is also reversed. Further, as shown in FIG. 3A, when the basic figures are arranged according to the locus, when the basic figures overlap each other, when the pixels of all the basic figures are written, as shown in FIG. A part of a representative central pixel is lost in the series of pixels constituting the, and the expressive power of the intended figure becomes small, or the effect of suppressing the jaggies cannot be seen well.

For this reason, when writing a basic figure, when it overlaps with the previous basic figure, the pixel of the basic figure at the overlapping position is compared with the pixel of the frame memory, and that pixel of the basic figure is the central pixel of the basic figure. If the brightness is close, write
In the opposite case, if the writing is not performed, the central pixel is not damaged as shown in FIG.

[0023]

As is apparent from the above description, according to the present invention, the contents of the basic figure memory are sequentially and repeatedly output to the frame memory connected to the basic memory in accordance with the locus signal generated by the locus generator. Since the same process as that of a human being drawing a figure is simulated, there is an effect that an arbitrary figure is generated and an antialiasing process is performed simultaneously with drawing.
Further, there is an effect that an unnatural figure is not generated even when the loci overlap.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of a graphic generation device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a basic figure and its trajectory.

FIG. 3 is a diagram showing another example of a basic figure and its trajectory.

FIG. 4 is a block diagram of a main part of a conventional graphic generator.

FIG. 5 is a diagram showing an example of an input point sequence of a figure.

FIG. 6 is a block diagram of a main part of another conventional graphic generator.

FIG. 7 is a diagram showing an example of a center line and a contour line of a figure.

FIG. 8 is a diagram showing another conventional graphic generation method.

FIG. 9 is a diagram showing another conventional graphic generation method.

[Explanation of symbols]

 1 Figure Deformation Device 2 Deformation Conversion Circuit Section 3 Gradation Setting Circuit Section 4 Deformation Operation Input Circuit 5 Basic Figure Memory 6 Basic Figure Indication Circuit 7 Frame Memory 8 Frame Memory Write Circuit 9 Frame Memory Write Control Circuit 10 Address Generator 11 Trajectory Generation Device 12 Trajectory control input circuit

Front page continued (72) Inventor Sanae Aoyagi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yoshiyuki Miyabe 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. Person Yoshida Jun 1006, Kadoma, Kadoma-shi, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yutaka Morii 2-2-1, Jinnan, Shibuya-ku, Tokyo Broadcasting Center of Japan Broadcasting Corporation (72) Inventor Ryo Yoshida Tokyo 2-2-1 Jinnan, Shibuya-ku, Tokyo Broadcasting Association of Japan Broadcasting Center (72) Inventor Mikito Ishikawa 4-3-1, Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industrial Co., Ltd.

Claims (2)

[Claims] 1. A transformation conversion circuit section for geometrically transforming digitized input figure data to convert it into figure information, a gradation setting circuit section for giving gradations in which the brightness of a central pixel and peripheral pixels are different, A graphic transformation having a transformation operation input circuit for designating the type and amount of geometric transformation of input graphic data and a gradation of the input graphic data, and performing geometric transformation conversion and gradation setting on the input graphic data. Device, a basic figure memory for storing a basic figure output from the figure deforming apparatus and having gradations with different brightness in peripheral pixels and central pixels, and a trajectory signal for continuously giving coordinates of the position of the basic figure A locus generating device, a frame memory for holding the basic figure on the locus, a frame memory writing circuit for writing the basic figure in the frame memory, and before being determined from the locus signal. An address generating circuit for calculating an address of the frame memory and sending a read address signal to the basic figure memory and a write address signal to the frame memory is repeatedly stored in the frame memory by repeatedly drawing the basic figure. A figure generation device characterized by generating an arbitrary figure by doing so. 2. A frame memory writing circuit, when writing a plurality of the basic figures in the frame memory according to a locus, if the basic figures have a partial overlap with each other, a pixel to be written in the basic figure. If the brightness of is closer to the brightness of the pixel at the center of the basic figure than the brightness of the pixel on the frame memory at the writing position,
The graphic generating apparatus according to claim 1, wherein a jagged graphic is generated by writing the basic graphic in the frame memory.