JPH09222875A - Color graphic plotting system and plotting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily plot any given graphics whose color variously changes by calculating an RGB value on a picture element in a plotting range on the basis of an operation expression. SOLUTION: A range designating means 11 to designate a plotting range of a color, a reference setting means 12 to set a reference position and a reference of a color containing a reference color in a designated range, an operation expression setting means 13 to set an operation expression of expressing a change in a color by a relative position from a reference of a color by a numeric value of RGB and an operation means 14 to calculate an RGB value on a picture element in a plotting range on the basis of the operation expression are provided. Therefore, a change in a color calculated by the operation expression of RGB can be plotted with a reference set in a designated range as the center. Therefore, a change in a color can be controlled in a picture element unit, and graphics composed of various color combinations on which a color naturally and smoothly changes can be freely plotted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color graphic drawing system, and more particularly, to a color graphics drawing system and a drawing method capable of easily drawing an arbitrary graphic that changes from various colors to colors.

[0002]

2. Description of the Related Art In a conventional computer graphic system, since a graphic creator generally creates a graphic while seeing colors displayed on a display device such as a color CRT,
When a color is changed subtly by gradation or the like, drawing is performed by using a color pattern that the graphic system has in advance. That is, drawing is performed by selecting a specific color and a pattern of color change from patterns prepared in advance.

As a description of a technique for performing drawing by using a color pattern which the system has in advance, there is, for example, one disclosed in Japanese Patent Laid-Open No. 3-103903. This Japanese Patent Application Laid-Open No. 3-103903 discloses the content of drawing a color on a surface of a workpiece, which is a target of a three-dimensional graphic, by a designated pattern.

[0004]

As described above, since the conventional graphic system is a method of selecting and combining predetermined color patterns, the color may be delicately changed by an arbitrary combination of colors. It was difficult to draw changing graphics.

Further, in the conventional graphic system, it is difficult to easily draw an arbitrary color change pattern because only the color change pattern is prepared in advance.

It is an object of the present invention to provide a color graphic drawing system and a drawing method that solve the above-mentioned conventional drawbacks and can easily draw an arbitrary graphic that changes from various colors to colors. And

Another object of the present invention is to provide a color graphic drawing system and a drawing method capable of easily drawing a graphic in which the color changes toward the surroundings from an arbitrary position as a base point. It is in.

[0008]

In order to achieve the above object, a color graphic drawing system of the present invention includes range specifying means for specifying a color drawing range, and a reference position and a reference color within the specified range. Reference setting means for setting a color reference, arithmetic expression setting means for setting an arithmetic expression expressing a change in color due to a relative position from the color reference with RGB numerical values, and the arithmetic expression for the pixels within the drawing range. And an arithmetic means for calculating RGB values based on the above.

According to another aspect of the color graphic drawing system of the present invention, the reference setting means specifies, as the color reference, position information and an RGB value at any at least one point within the drawing range. Characterize.

In the color graphic drawing system of the present invention as defined in claim 3, the reference setting means specifies position information indicating a boundary line of the drawing range and an RGB value as the color reference.

According to a fourth aspect of the present invention, there is provided a color graphic drawing system including a judging means for judging whether or not the calculation of the RGB values by the calculating means is completed for all the pixels within the drawing range. When it is determined that the calculation of the RGB values of all the pixels in the drawing range is completed, a color is drawn in the drawing range based on the calculated RGB values.

According to a fifth aspect of the color graphic drawing method of the present invention, a step of specifying a color drawing range, a step of setting a color reference including a reference position and a reference color within the specified range; A step of setting an arithmetic expression that represents a change in color depending on a relative position from the reference of RGB numerical values, and a step of calculating an RGB value based on the arithmetic expression for pixels in the drawing range. To do.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a color graphic drawing system according to an embodiment of the present invention. In FIG. 1, the color graphic drawing system of the present embodiment includes a range specifying means 11 for specifying a drawing range of a color graphic and a reference setting means 12 for setting a color reference (reference position and reference color) within the specified range. And an arithmetic expression setting means 13 for setting an arithmetic expression expressing the change in color depending on the relative position from the color reference in RGB.
And R for calculating RGB values based on the set arithmetic expression
GB calculation means 14, judgment means 15 for judging whether the calculation of RGB values by calculation formulas has been completed for all pixels within the specified range, and display of a color CRT or the like for displaying colors based on the calculated RGB values. And means 16.

Next, the drawing process by the color graphic drawing system will be described with reference to the flowchart of FIG.

First, the range designating unit 11 designates a range to be drawn on the display screen of the display unit 16 (step 201). This range designation is executed using a pointing device or the like. In addition, the range can be specified by a shape such as a square, a circle, and an ellipse.

Next, within the designated range, the standard for color change is designated by the standard setting means 12 (step 2).
02). For example, to specify the color change criterion with dots,
An arbitrary base point Pt (X = s, Y = t) within the designated range and R representing the red, green, and blue brightness of the pixel located at the base point Pt
The initial value (R1, G1, B1) of the GB value is designated.

In FIG. 3, the base point Pt (X = X
s, Y = t) and the initial values (R1, G1, B1) of the RGB values of the pixel located at the base point Pt are designated.

Further, after the reference is set, the arithmetic expression setting means 1
An arithmetic expression for color change to be drawn within the designated range is designated by 3 (step 203). As this arithmetic expression, for example, the change in color depending on the relative position from the base point Pt is R
Calculation formula represented by GB R = R (X-s, Y-t), G = G
(X-s, Y-t) and B = B (X-s, Y-t) are designated.

From the base point Pt (X = s, Y = t) to 10
An arithmetic expression in which the red brightness R changes by “1” for each pixel can be specified as follows. The same applies to the green brightness G and the blue brightness B.

[0020]

[Equation 1]

Further, the arithmetic expression for changing the red luminance R by "1" for each pixel from the base point Pt (X = s, Y = t) is as follows:
It can be specified as follows:

[0022]

[Equation 2]

FIG. 4 shows an example in which a boundary line 40 (a boundary line of the designated range 30) perpendicular to the X axis is designated by the X coordinate value (X1) as a color reference within the designated range 30. Here, an arithmetic expression in which the RGB values change along the X-axis direction based on the reference line of the initial values (R1, G1, B1) is specified as follows.

Rx = 0.1 × (X−X1) + R1 Further, it is possible to designate two or more base points within the designated range. In this case, RGB for each base point
Specify the initial value of. It is also possible to specify a reference line and a base point as a reference. In this case, the color is determined by synthesizing the calculation result of the arithmetic expression expressing the change in color by the relative position from the base point in RGB and the calculation result of the arithmetic expression expressing the change in color in the relative position from the reference line in RGB.

In the setting of the arithmetic expression by the arithmetic expression setting means 13, the user may set it by directly inputting the arithmetic expression, or the user may select from a plurality of preset arithmetic expressions. It may be configured to be selected and set.

After setting the arithmetic expression, the judgment means 15 judges whether the calculation of the RGB values has been completed for all the pixels within the designated range (step 204).
The RGB value is calculated by the RGB calculation means 14 based on the above-mentioned calculation formula (step 205), and
Colors are displayed on the display means 16 based on the RGB values obtained by the calculation (step 206).

As a result, it is possible to draw the change in color calculated by the RGB arithmetic expression centering on the reference set within the specified range. Therefore, it is possible to control the color change on a pixel-by-pixel basis, and it is possible to freely draw a graphic composed of various color combinations in which the color changes naturally and smoothly.

It should be noted that the present invention is not limited to the above-mentioned examples, and various modifications can be carried out within the scope of the technical idea thereof.

[0029]

As described above, according to the color graphic drawing system and the drawing method of the present invention, RGB
Since the color of each pixel is calculated by the arithmetic expression of the value, it is possible to easily draw an arbitrary graphic that changes from various colors to colors. In addition, it becomes possible to easily draw a graphic in which the color changes toward the surroundings on the basis of a certain arbitrary position.

Further, according to the present invention, since the base point or the boundary line serving as a color reference can be arbitrarily specified, the color pole can be set at an arbitrary position in the drawing range. Therefore, if the present invention is applied to a graphic such as a presentation material, it is possible to set a color pole to an object to be emphasized most and create a persuasive material.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a color graphic drawing system according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the contents of drawing processing by the color graphic drawing system according to the embodiment of the present invention.

FIG. 3 shows a base point Pt (X = s, Y = t) within a designated range and initial values (R of RGB values of pixels located at the base point Pt).
1, G1, B1) are designated.

FIG. 4 is a diagram showing an example in which a reference line perpendicular to the X axis (a boundary line of a specified range) is specified as a color reference within the specified range.

[Explanation of symbols]

 11 Range Designating Means 12 Reference Setting Means 13 Arithmetic Formula Setting Means 14 RGB Computing Means 15 Judging Means 16 Display Means

Claims (5)

[Claims] 1. A range specifying means for specifying a color drawing range, a reference setting means for setting a reference position and a color reference including a reference color in the specified range, and a relative position from the color reference. Arithmetic formula setting means for setting an arithmetic formula expressing the change in color with RGB numerical values, and R for pixels within the drawing range based on the arithmetic formula.
A color graphic drawing system, comprising: a calculating means for calculating a GB value. 2. The color graphic according to claim 1, wherein the reference setting unit specifies position information and an RGB value at at least one arbitrary point within the drawing range as the color reference. Drawing system. 3. The color graphic drawing system according to claim 1, wherein the reference setting means specifies position information indicating a boundary line of the drawing range and an RGB value as the color reference. 4. A judgment means for judging whether or not the calculation of the RGB values by the calculation means is completed for all the pixels within the drawing range, and the judgment means includes the RGB values of all the pixels within the drawing range. The color graphic drawing system according to claim 1, wherein a color is drawn in the drawing range based on the calculated RGB values when it is determined that the calculation of is finished. 5. A step of designating a color drawing range, a step of setting a reference position and a color reference including a reference color within the designated range, and a color change depending on a relative position from the color reference. A step of setting an arithmetic expression represented by numerical values of RGB; and R for pixels within the drawing range based on the arithmetic expression.
And a step of calculating a GB value.