JP2016177384A - Color table creation device and drawing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable edge drawing by vector data with less memory consumption.SOLUTION: A color table creation unit 1105 extracts color values for each angle of an edge from a circular light source model, where the color value for each position on a spherical body when light is applied from a light source in a specific direction to the spherical body, is defined, and creates a color table representing the color values extracted for each angle of the edge. A display list output unit 1109 outputs the color table to a drawing device.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technique for drawing an edge.

Patent Document 1 discloses a technique for drawing a meter needle having a plurality of edges using BMP data.
According to Patent Literature 1, if BMP image data with a stereoscopic effect is prepared for each display angle of the meter needle, the meter needle can be drawn as designed.

JP 2009-255638 A

  However, the method of Patent Document 1 has a problem that a large amount of BMP data is required when the display resolution of the meter hand is increased, and the required memory capacity increases.

  The main object of the present invention is to solve such a problem, and realizes a configuration that enables drawing of an edge by changing the hue of the edge according to the angle of the edge with a small amount of memory consumption. The main purpose is to do.

The color table generating apparatus according to the present invention is:
A drawing device that draws an edge based on vector data; a color table generating unit that generates a color table to be referred to in order to determine a color value of the edge according to the angle of the edge;
A color table output unit that outputs the color table generated by the color table generation unit to the drawing device;
The color table generator is
Extract a color value for each angle of the edge from a circular light source model in which the color value for each position on the sphere when light is applied to the sphere from a light source in a specific direction is defined by a linear gradation, A color table in which the extracted color values are described for each edge angle is generated.

In the present invention, memory consumption is reduced by using vector data.
In addition, the color value for each edge angle is extracted from the circular light source model in which the color value for each position on the sphere when light is applied to the sphere from a light source in a specific direction is defined by a linear gradation, Since a color list in which the extracted color values are described is generated for each angle of the edge, it is possible to draw the edge by changing the hue of the edge according to the angle of the edge using vector data.

FIG. 3 is a diagram illustrating a configuration example of a meter drawing apparatus according to the first embodiment. FIG. 3 is a diagram illustrating a functional module configuration example of the display list generation device according to the first embodiment. FIG. 3 shows an example of a meter needle according to the first embodiment. The figure which shows the example of drawing for every position on the rotation track | orbit of the meter needle which concerns on Embodiment 1. FIG. FIG. 3 shows an example of a light source model according to Embodiment 1. FIG. 4 is a diagram showing a procedure for extracting a color value from a light source model according to Embodiment 1; The figure which shows the example of decomposition | disassembly of the vector data of the meter needle which concerns on Embodiment 1. FIG. FIG. 4 shows an example of a display list according to the first embodiment. FIG. 3 shows an example of a color table according to Embodiment 1. FIG. 4 is a diagram illustrating a functional module configuration example of a drawing apparatus according to a second embodiment.

Embodiment 1 FIG.
In the present embodiment, an example in which a meter hand of a speedometer of a vehicle is drawn using 2D vector data as a guide is shown.
The pointer is not limited to the meter needle of the speedometer, and may be a meter needle such as a tachometer or a fuel meter.
The hands are not limited to meter hands, but may be clock hands, compass hands, or the like.
*** Explanation of configuration ***
FIG. 1 shows a configuration example of a meter drawing apparatus 10 according to the present embodiment.
The meter drawing device 10 includes a display list generation device 11 and a drawing device 12.
The display list generation device 11 corresponds to an example of a color table generation device.

The drawing device 12 draws a three-dimensional meter needle including a plurality of edges, which represents a state in which light is applied from a specific direction, based on 2D vector data as shown in FIG.
Then, the drawing device 12 performs drawing in which the meter needle rotates on the meter board, which is a pointer board, as shown in FIG. 4 in accordance with changes in the speed of the vehicle.
That is, the drawing device 12 has an edge (the edge indicated by the “bright” arrow in FIG. 4) and a shadowed edge (the “dark” arrow in FIG. 4) in accordance with the rotation of the meter needle. Drawing that dynamically changes the pointing edge).
The drawing device 12 applies the color value defined in the color table included in the display list 50 generated by the display list generation device 11 according to the angle of each edge for each edge of the meter needle. Draw the rotation.

The display list generation device 11 generates a display list 50 and outputs the generated display list 50 to the drawing device 12.
The display list 50 is data in which hardware (hereinafter, referred to as “H / W”) drawing commands that the drawing device 12 refers to perform drawing in which the meter needle rotates as shown in FIG.
That is, the display list 50 is data in which drawing commands necessary for drawing the meter needle are collected, and a series of drawing processing of the meter needle can be executed by a single drawing command.
The display list 50 includes a color table.
In the color table, edge color values are defined for each edge angle.
The display list generation device 11 receives the vector data 20 constituting the meter hand, the background BMP data 30, and the script data 40, which is a collection of information necessary for drawing, represented by the drawing position, as input. Is generated.

The display list generation device 11 is a CPU (Central Processing).
(Unit) 111, memory 112, and HDD (Hard Disk Drive) 113.
The CPU 111 generates a display list 50 by executing a program for generating the display list 50.
Details of the program executed by the CPU 111 will be described later.
The HDD 113 stores a program executed by the CPU 111.
The program is loaded from the HDD 113 to the memory 112, and the CPU 111 executes the program loaded to the memory 112.
The HDD 113 also stores an OS (Operating System). At least a part of the OS is loaded into the memory 112, and the CPU 111 executes a program for generating the display list 50 while executing the OS.

The drawing apparatus includes a CPU 121, a memory 122, a drawing H / W 123, and a VRAM (Video RAM) 124.
The display list 50 is arranged in the memory 122, and the drawing H / W 123 draws the meter hand in the VRAM 124 by referring to the display list 50.
Since the display list 50 is aggregated data of a series of H / W drawing commands, the drawing device 12 sets the numerical value of the meter needle, and simply notifies the drawing H / W 123 of the leading address of the display list 50. Can be drawn.
As described above, by using the display list 50, it is possible to obtain merits such as high-speed drawing and securing CPU resources.

FIG. 2 shows a functional module configuration example of the display list generation device 11 according to the present embodiment.
Each element shown in FIG. 2 can be realized as a program, and the display list 50 can be generated by the CPU 111 executing the program of each element shown in FIG.

  The display list generation device 11 includes a control unit 1101, a script analysis unit 1102, a vector data analysis unit 1103, a display list generation unit 1104, and a display list output unit 1109.

  The control unit 1101 performs overall control of the display list generation device 11.

The script analysis unit 1102 acquires drawing parameters in the script data 40.
The drawing parameters mainly include file path information of vector data and BMP data, meter display position, meter minimum / maximum values (for speed meters, 0 km / h, 180 km / h, etc.), meter needle minimum The display angle, the maximum display angle, and information on the color value applied to the shadow of the edge portion of the needle are included.

The vector data analysis unit 1103 extracts vector data drawing information.
The vector data includes information such as path data representing the shape (defined by commands such as MOVETO, LINETO, CURVETO, etc., representing straight lines, curves, etc.) and color values inside the vector data.

  The display list generation unit 1104 generates the display list 50 based on the drawing parameters, vector data drawing information, and BMP image data.

The display list output unit 1109 outputs the display list 50 generated by the display list generation unit 1104 to the drawing device 12.
As described above, since the display list includes a color table, the display list output unit 1109 functions as a color table output unit.

  Next, the internal configuration of the display list generation unit 1104 will be described.

The color table generation unit 1105 generates correspondence information between the light source model and the color value of the edge of the meter needle as a color table, and generates a mechanism that can easily acquire the color value with respect to the display angle of the edge.
Details regarding the light source model and the color table will be described later.

  The 2D matrix generation unit 1106 generates data for setting matrix information that enables rotation, expansion / contraction, and parallel movement of the meter needle, and is used for adjustment of the display position of the meter and rotation.

  The path data generation unit 1107 generates drawing command data for drawing by the drawing H / W 123 based on the drawing information of the vector data to be drawn.

  The subroutine generation unit 1108 collects the setting processing necessary for the drawing as a subroutine, aggregates the setting processing as a series of drawing H / W drawing processing commands, and generates the display list 50.

Next, a light source model applied to the edge portion of the meter needle by the color table generation unit 1105 will be described.
FIG. 5 shows an example of a light source model according to the present embodiment.

In the light source model of FIG. 5, it is assumed that the light source exists in a specific direction (upper left direction in FIG. 5).
The light source model is a circular model in which color values for each position on the sphere when light is applied from the light source to the sphere are defined by linear gradation.
More precisely, the light source model defines the brightest color value at the point closest to the light source of the sphere when the light source shines on the sphere, and the darkest color value at the point farthest from the sphere light source. This is a circular model in which a linear gradation is set from a point closest to the light source to a point farthest from the light source.
Also, the linear gradation allows a multi-stage setting, and is defined by setting a ratio of a distance from a point closest to the light source and a color value.
In the example of FIG. 5, gradation is specified in two stages, the ratio of gradation as a branching point is 35%, the maximum color value is 255, and (R, G, B) = (255, 23, 68). It is said.
In this way, it is possible to adjust the degree of light hitting by supporting multi-step gradation.
Also, the difference in the expression of the angle of the edge portion shown in the cross-sectional view of FIG. 3 and the expression of the shadow depending on how the light hits can be easily realized by changing only the color value of the light source model.

*** Explanation of operation ***
Next, a method for assigning the light source model defined above to the color value of the edge portion of the meter needle will be described.
As shown in FIG. 6, the color table generating unit 1105 acquires the angle in the normal direction of the edge portion of the meter needle, extends the line from the center of the light source model circle in the normal direction (602), The color value at the point of crossing with is adopted as the color value of the edge portion of the meter needle (603).
Since the display angle of the edge of the meter needle is different for each side constituting the meter needle, when drawing one meter needle, the normal direction of the edge is referenced for each edge angle, and the corresponding color value To extract.
FIG. 7 is an exploded view of vector data constituting the meter needle, and is composed of top plate data located at the center of rotation 701, needle body data 702, and edge portion data 703-707.
The light source model described above is applied only to the edge data of the meter needle, and the color values defined as vector data are used for drawing the top plate data and needle body data. To do.
By doing so, it is possible to dynamically change the shadow expression applied to the edge of the meter needle during rotation, and a natural and three-dimensional meter needle can be reproduced.
Actually, the calculation for selecting the color value of the light source model calculates the ratio of the distance from the position closest to the light source and determines the display color, as indicated by reference numeral 604 in FIG.
In the light source model, when the length of the diameter of the circle is 2, and the angle between the light incident angle and the normal direction of the needle edge is θ, the ratio of the gradation of the selected color can be obtained by equation (1).
(1-cos θ) / 2 (1)

FIG. 8 shows an example of the display list 50.
The drawing H / W 123 of the drawing device 12 draws the meter needle by executing drawing processing commands in order from the top address of the subroutine reference portion. .
In the color table, as shown in FIG. 9, a color value corresponding to a value of (1-cos θ) / 2 is defined.
When drawing the speedometer, the drawing H / W 123 obtains the vehicle speed information, determines the position of the meter needle on the rotation track corresponding to the vehicle speed, and calculates the value of (1-cos θ) / 2 for each edge. The color value corresponding to the specified (1-cos θ) / 2 is acquired from the color table of the display list 50.
The correspondence information between the light source model and the color value of the edge of the meter needle is reflected in the data referred to by the color value setting processing instruction, and the drawing H / W 123 refers to it every time before drawing the needle edge path data, Dynamically draw the shadow of the meter needle.

Next, the color table will be described.
As shown in FIG. 9, the color table generation unit 1105 creates in advance the color value of the shaded portion with respect to the gradation ratio as a color table, and easily obtains the color value by inputting the display angle of the meter needle edge. Generate a mechanism to do.
The number of gradations of the color table created here is arbitrary, and it is desirable to adjust according to the display resolution of the needle.
The color table created here is stored in the subroutine data relating to the color values in FIG. 8, and the drawing H / W 123 dynamically refers to the shadow color defined in the light source model by referring to the color value setting process. Reproduce a three-dimensional needle.
As described above, the color table generation unit 1105 extracts the color value for each angle of the edge by the method illustrated in FIG. 6, and calculates the extracted color value, the light incident direction, and the edge normal direction. An angle (θ) is associated with each other, and a color table in which the association between the color value and the edge angle is described is generated.

*** Explanation of effects ***
As described above, in this embodiment, memory consumption is suppressed by using vector data.
In addition, a color value is extracted for each edge angle on a circular light source model in which a linear gradation of a sphere when light is applied from a light source in a specific direction to the sphere, and the extracted color value is indicated. Generate a display list.
For this reason, it is possible to draw an edge by changing the hue of the edge according to the angle of the edge using vector data.
And since it is possible to draw the edge by changing the color of the edge according to the angle of the edge in this way, the edge that is exposed to light and the edge that is shaded change according to the rotation of the meter needle It is possible to perform drawing.

Embodiment 2. FIG.
In the first embodiment, the drawing device 12 applies a color value defined in the color table generated by the display list generation device 11 to each edge to draw the meter needle.
In the present embodiment, the drawing device 12 generates a color table using a light source model.

In the present embodiment, the drawing apparatus 12 has a configuration in which the drawing H / W 123 is omitted from the configuration shown in FIG.
In this embodiment, the CPU 121 executes a program that implements the functional module shown in FIG. 10 and performs the following processing.
The program is stored in the memory 122.
Also in the present embodiment, the display list 50 is output from the display list generation device 11 to the drawing device 12, but the display list 50 according to the present embodiment has the color value setting and color table from the configuration of FIG. Is omitted data.

In FIG. 2, a color table generation unit 1201 extracts color values using the light source model shown in FIG. 6, and generates a color table.
The color table extraction method of the color table generation unit 1201 is the same as that of the color table generation unit 1105 of the first embodiment.
That is, the color table generation unit 1201 extends the line from the center point of the light source model in FIG. 6 to the normal direction of the edge for each angle of the edge, and extracts a color value at a point intersecting the circumference of the light source model. .
The color table generated by the color table generation unit 1201 is the same as that shown in FIG.

The light source model storage unit 1202 stores the light source model shown in FIG.
The color table storage unit 1203 stores the color table generated by the color table generation unit 1201.
The drawing processing unit 1204 draws the meter hand using the display list 50 and the color table.
The drawing method of the drawing processing unit 1204 is the same as the drawing H / W 123 of the first embodiment.

  As described above, according to the present embodiment, even if the dedicated drawing H / W is not used, the drawing software is executed, so that the vector data is used to illuminate with the rotation of the meter needle. It is possible to perform drawing by changing the edge that is in shadow and the edge that is in shadow.

Although the embodiments of the present invention have been described above, these two embodiments may be combined and implemented.
Alternatively, one of these two embodiments may be partially implemented.
Alternatively, these two embodiments may be partially combined.
In addition, this invention is not limited to these embodiment, A various change is possible as needed.

  10 meter drawing device, 11 display list generating device, 12 drawing device, 20 vector data, 30 BMP data, 40 script data, 50 display list, 111 CPU, 112 memory, 113 HDD, 121 CPU, 122 memory, 123 drawing H / W, 124 VRAM, 1101 control unit, 1102 script analysis unit, 1103 vector data analysis unit, 1104 display list generation unit, 1105 color table generation unit, 1106 2D matrix generation unit, 1107 path data generation unit, 1108 subroutine generation unit, 1109 Display list output unit, 1201 color table generation unit, 1202 light source model storage unit, 1203 color table storage unit, 1204 drawing processing unit.

Claims (6)

A drawing device that draws an edge based on vector data; a color table generating unit that generates a color table to be referred to in order to determine a color value of the edge according to the angle of the edge;
A color table output unit that outputs the color table generated by the color table generation unit to the drawing device;
The color table generator is
Extract a color value for each angle of the edge from a circular light source model in which the color value for each position on the sphere when light is applied to the sphere from a light source in a specific direction is defined by a linear gradation, A color table generation device that generates a color table in which extracted color values are described for each angle of the edge. The color table generator is
From the center point of the light source model, for each angle of the edge, a line is extended in the direction of the normal of the edge,
Extracting a color value at a point where a line extending from the center point of the light source model in the direction of the normal of the edge intersects the circumference of the light source model;
The color table generating apparatus according to claim 1, wherein a color table in which the extracted color values are described is generated for each edge angle. The color table generator is
The drawing apparatus that draws a state in which light is applied to the edge from the specific direction generates a color table that is referred to in order to determine a color value of the edge according to the angle of the edge. Color table generator. A drawing device for drawing an edge based on vector data,
Extract a color value for each angle of the edge from a circular light source model in which the color value for each position on the sphere when light is applied to the sphere from a light source in a specific direction is defined by a linear gradation, A color table generating unit that generates a color table in which the extracted color value is described for each angle of the edge;
A drawing apparatus comprising: a drawing processing unit that determines a color value of the edge according to an angle of the edge using the color table generated by the color table generation unit, and draws the edge with the determined color value. The color table generator is
From the center point of the light source model, for each angle of the edge, a line is extended in the direction of the normal of the edge,
Extracting a color value at a point where a line extending from the center point of the light source model in the direction of the normal of the edge intersects the circumference of the light source model;
The drawing apparatus according to claim 4, wherein a color table in which the extracted color values are described is generated for each edge angle. The color table generator is
The drawing processing unit for drawing a state in which light is applied to the edge from the specific direction generates a color table to be referred to in order to determine a color value of the edge according to the angle of the edge. The drawing apparatus described.

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