JP3153314B2 - Graphic display 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 graphic display device for displaying a graphic such as a wake or a marine chart on a display such as a CRT.

[0002]

2. Description of the Related Art A wake display device which displays a wake on a display such as a CRT sequentially stores position data sent from a navigation device in a memory, reads data from the memory, and reads the data from the memory. Is displayed. In such a wake display device, a wake is displayed along with a marine chart such as a shoreline and other targets, in addition to a latitude line and a longitude line.

In general, chart data for displaying a chart on a display such as a CRT is obtained by digitizing an actual chart, compressing the data, and converting a predetermined section into position data of a plurality of points in a ROM or a floppy disk in advance. The written one is used. When a chart is displayed on a display unit based on such chart data, the shoreline etc. are displayed as broken lines connecting the points of the digitized multiple points with straight lines, and the scale of the scale normally used is not shown. And are apparently displayed as curves.

[0004]

However, such a broken line connecting a plurality of positions sequentially with line segments, for example, in the case of a coastline, merely represents the boundary line between land and sea, and is actually displayed. It was sometimes not immediately readable which side of the shoreline was land and which side was sea. In particular, the tendency is remarkable in the display of a complicated shoreline of an inlet or a shoreline in a sea area where the voyage is for the first time.

Therefore, when displaying the shoreline on the display,
Instead of displaying the shoreline as a curved line (folded line), it is conceivable to display the entire pattern on the land side by filling it with a specific color. However, if the entire land is displayed in a specific color, the emission brightness of the land is high,
When a device such as a wake display device for displaying the chart is used in the cabin at night, the display screen of the CRT is noticeably dazzling. Even if the brightness of the screen can be reduced by using knobs and keys, if the brightness of the land is reduced to a level that is not dazzling, the latitude, longitude, wake,
Or the display of other characters and symbols becomes extremely dark. For this reason, there is a possibility that the interpretation becomes difficult or the reading is erroneous.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a graphic display device in which the distinction between different areas such as land and sea is visually clarified, and the screen brightness can be appropriately suppressed even in a use state under low illuminance. Is to do.

[0007]

According to the present invention, there is provided a graphic display device for displaying a graphic including a boundary line indicating a boundary between different areas, a display means for inputting a display signal and illuminating and displaying the graphic. generates display data lines is written into the display memory, and border display data writing means, operation
The state of the unit is read, and the average luminance is calculated for each operation of the operation unit.
A fill pattern selecting means for sequentially selecting a fill pattern in the order of size, and at least one of a plurality of areas divided by the boundary line as a boundary , with a pattern selected by the fill pattern selecting means. A fill pattern display data writing unit that generates display data to be written and writes the display data to the display memory; and a display signal generation unit that generates a display signal from the contents of the display memory and provides the display signal to the display unit. .

[0008]

In the graphic display device of the present invention, the boundary line display data writing means generates display data of the boundary line and writes it in the display memory, and the filling pattern selecting means selects a plurality of kinds of filling patterns having different average luminances. Select one fill pattern. The fill pattern display data writing means generates display data for displaying one of the two areas bounded by the boundary line with the selected pattern, and writes the display data in the display memory. The display signal generation means generates a display signal from the contents of the display memory and provides the display signal to the display means. Thus, the display means illuminates and displays the fill pattern in one of the two regions having the boundary as a boundary, together with the boundary.

In order to operate as described above, a plurality of types of fill patterns having different average luminances are set in advance as a plurality of types of fill patterns that can be selected by the fill pattern selecting means. In a low state, the glare of the display screen can be suppressed by selecting a fill pattern having a low average luminance. Further, in an environment where a large amount of external light is incident, such as during the daytime, by selecting a solid color pattern having a high average luminance, it is possible to easily grasp two regions having a boundary as a boundary.

[0010]

1 is a block diagram showing the configuration of a wake display device according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a microprocessor for executing a program previously written in the ROM 6 and performing various processes described later. The navigation device 2 is composed of, for example, a GPS receiver or a Loran-C receiver, and measures the position of its own ship and sends an interrupt signal to the microprocessor 1. The microprocessor 1 operates the navigation device 2 by interrupt processing.
Read positioning data from. The key input device 3 includes a key switch for adjusting the brightness of the display screen, and sends an interrupt signal to the microprocessor 1 by operating any key. The microprocessor 1 reads the key operation contents by interrupt processing. A plurality of types of paint patterns described later are written in the PROM 4 in advance. RA
M5 is used as various working areas when the microprocessor 1 executes a program. The clock circuit 7 measures the current date and time. The trackball 8 is used to move the cursor position in the display screen. The up / down counter 9 counts the operation amount of the trackball 8, and the microprocessor 1 reads the operation amount of the trackball based on the contents of the up / down counter 9. A certain range of chart data is written in the memory card 10 in advance, and the microprocessor 1 reads the data via the buffer 11. The multiplexer 12 has an address
A data multiplex is performed, and a GDC (graphic display controller) 13 is a multiplexer 12
Various commands and data are input from the microprocessor 1 via the. The demultiplexer 14 has an address
The GDC 13 performs data separation, and the GDC 13
A dot pattern for display is written to the VRAM 15 via the. Reference numeral 19 denotes a signal conversion circuit. The GDC 13 supplies vertical and horizontal synchronization signals to the CRT 20 via the signal conversion circuit 19. Reference numeral 16 denotes four sets of PS conversion circuits for converting the 4-bit data from parallel to serial. The VRAM 15 is, for example, 128 kbytes (640 dots wide × 400 dots high × 4 bits = 128 bits).
k bytes) of display memory for four screens, of which three screens are RGB for graphics display.
The three-color display screen and the remaining one screen are memories for display patterns such as cursors and marks for displaying white. The video synthesizing circuit 17 serially inputs the display memories for four screens and synthesizes them as RGB video signals. Reference numeral 18 denotes a buffer circuit.
And outputs an RGB signal to the CRT 20 via the.

Next, FIGS. 2 to 4 show examples of display screens displayed on the CRT 20 shown in FIG. 2 to 4, A denotes land, B denotes the sea, C denotes the shoreline, and D denotes the wake of a ship sailing offshore from the bay. La is a latitude line, L is
o is a longitude line. In FIG. 2, a marine chart is shown by a shoreline C, a latitude line La and a longitude line Lo, and a wake D is displayed together with the marine chart. In FIG. 3 and FIG. 4, a land-side area A bounded by the coastline C is displayed in a solid pattern. In FIG. 3, the average luminance of the filled pattern is low, and in FIG. 4, the average luminance is high. Under high illuminance such as during the daytime, as shown in FIG. 4, the shape of the coastline can be clearly displayed by filling and displaying the land with a fill pattern having a high average luminance. Under low illuminance, such as in the evening or early morning, as shown in FIG. 3, by displaying the land with a fill pattern having a low average luminance, the glare of the screen can be suppressed and the marine chart can be clearly displayed. Further, in order to further suppress the brightness of the screen as necessary, as shown in FIG. 2, a black (non-light emitting) dot pattern is used, or the land is not filled from the beginning. Note that even if the average luminance of the painted area is changed, the luminance of the shoreline C, the latitude line La, the longitude line Lo, the wake D, and the like does not change.

In order to change the brightness of the entire display screen including these patterns, the screen brightness may be adjusted in the same manner as in the prior art.

Next, FIG. 5 shows an example of a paint pattern set in advance. Figure 1 shows the fill pattern
The data is given as a paint pattern to the GDC 13 shown in (1). For example, a pattern of 16 dots vertically by 16 dots horizontally is repeated to paint the inside of a flat curved surface. FIG.
(A) is a fill pattern in which the entire area of 16 × 16 dots is black (non-light emitting), and (B) to (G) are 16
This is a fill pattern in which light emitting dots are dispersed in × 16 dots, and the distribution density of the light emitting dots is different from one another. (H) is a fill pattern in which all 16 × 16 dots are emitted dots. In this way, by selecting the eight types of fill patterns shown in (A) to (H), the fill region can be displayed with eight gradations.

When a predetermined area is to be painted using the GDC 13 shown in FIG. 1, a border color (color of a line to be a border) and a dot address of a search start point (hereinafter referred to as seed data) are designated and painted. By issuing the command, the inside of the closed curved surface can be painted with a preset painting pattern. For example, when the display color of the shoreline is set as the boundary color and the land side is painted out, a certain point on the land may be used as seed data. However, depending on the scale of the chart, for example, as shown in FIG. Then, when one continuous area is displayed on a reduced scale, the boundary lines may be merged and divided into a plurality of closed areas. In such a case, there is a problem that the filling is performed only on the closed area where the seed data exists, and the other isolated closed areas are not filled. Therefore, when a continuous area is divided by reduction as shown in FIG. 6, a plurality of seed data is set in advance so that seed data exists in each of the divided areas even by reduction. deep. In FIG. 6, S1 and S2 indicate the positions of the seed data, respectively.

Also, even if the scale is constant, if the display range of the chart moves and the seed data no longer exists in the display screen, it takes a long time before the land on the screen is filled. become. Therefore, a plurality of seed data are set in a predetermined area such as land. In FIG. 7, S3
S4 and S5 respectively indicate the positions of the seed data. In this case, the land area in the display screen is filled in a short time by performing the filling from S3 in the display screen.

Next, FIG. 8 shows a configuration of a main part of the chart data written in the memory card 10 and the chart data written in the RAM 5 shown in FIG. FIG. 8 (A)
Is an area for storing the position of each point representing the shoreline, which is written in the memory card 10 in advance, and stores latitude data and longitude data of each point. FIG. 8 (A)
In (La0, Lo0) is the 0th latitude and longitude data, and (Lan, Lon) is the nth latitude and longitude data. (Las0, Loss0) is the latitude and longitude data of the 0th seed data, and (Lasm, Losm) is the latitude and longitude data of the mth seed data.

FIG. 8B is an area in the RAM 5 for storing the dot address of each point on the VRAM (display memory) from the latitude and longitude data shown in FIG.
(y0) is the 0th dot address, and (xn, yn) is n
This is the dot address of the th. Also, (xs0, ys0)
Is the dot address of the 0th seed data, (xsm, ys
m) is the dot address of the m-th seed data. VR
When writing a shoreline pattern on AM, (x0, y
Each point of (0) to (xn, yn) is defined as a node, and each node is displayed as a broken line connecting straight lines. When the land side is filled with a predetermined fill pattern, (xs0, ys
0) to (xsm, ysm), the filling is started from the dot addresses of various data.

Next, FIGS. 9 to 11 show examples of data and commands to be given to the GDC 13 when the GDC 13 shown in FIG. Here, an example is shown in which NEC μPD72123 manufactured by NEC is used as the GDC. In FIG. 9, PTNP is the lowest address (pattern pointer) of the filled pattern storage memory area.
The 3-byte address data, PTNCNT, is 2-byte data indicating the number of words in the paint pattern. For example, in the case of a fill pattern of 16 × 16 dots, the value 16 is written to PTNCNT. FIG. 10 is a storage area (area in the PROM 4 shown in FIG. 1) of the eight types of paint patterns shown in FIG. 5, and the PTNP shown in FIG. By setting the location address, one fill pattern can be set. In FIG. 11, X and Y are registers for setting a dot address of seed data, and DX is a register for setting a boundary color. After setting various data as shown in FIGS. 9 to 11, a paint command is given to the GDC 13.

Next, the microprocessor 1 shown in FIG.
12 to 16 are shown as flowcharts in FIGS.

FIG. 12 shows the procedure for displaying a chart. First, the currently set scale data and screen center position (latitude, longitude) data are read (n1 → n2). afterwards,
The start address of the chart data previously written in the memory card 10 (La0, La0,
(Lo0 storage address) is set to the pointer P (n
3). Then, the chart data (latitude,
Longitude data) is read out, the dot address is calculated and stored (n4 → n5). Then, a dot is displayed in the dot address in the color of the shoreline (n6). Until the pointer P reaches the end point, the pointer P is incremented and the processing from step n4 is repeated (n7 →
n8 → n4 ...). In step n6, the dot indicated by the pointer P-1 and the dot indicated by the pointer P are connected with a straight line, and the display pattern of the broken line is microscopically displayed.
Write to RAM. After that, the start address of the seed data ((Las0, Lo) shown in FIG.
s0) is set (n9), the seed data indicated by the pointer P is read out, the dot address is calculated and stored (n10 → n11). Step n
The processing of steps 10 and n11 is performed for all seed data (n12 → n13 → n10...). Thereafter, the chart is filled (n14).

FIG. 13 shows the procedure of the chart filling process. First, the storage address of the paint pattern is set to PTNP shown in FIG. 9 in accordance with the variable B (B = 0 to 7) (n20). Subsequently, the start address of the dot address data of the seed data (the addresses of xs0 and ys0 shown in FIG. 8B) is set to the pointer P (n2).
1). Then, it is determined whether or not the dot address of the seed data indicated by the pointer P is within the display screen. If the dot address is outside the screen, the same determination is performed by incrementing the pointer P (n22 → n23 → n22...). ). If the dot address is within the display screen, the dot address of the seed data is set in the X and Y registers shown in FIG. 11 (n2
4). Subsequently, the border color is set in the DX register shown in FIG. 11 (n25). Thereafter, a painting command is issued to the GDC 13 (n26).

The above processing is repeated until the pointer P reaches the end point (n27 → n23 → n22...).

FIG. 14 shows an interrupt process from the key input unit 3, and FIG. 15 shows a process according to the operation of the * key, which is an operation unit for brightness adjustment . When the key input section is operated, FIG.
The key is read by the interrupt processing shown in FIG.
If the operated key is the * key, the variable B is incremented first (n30 → n3) as shown in FIG.
1). However, when B = 7, B is returned to 0 (n32).
Subsequently, a chart filling process is performed (n33). Thus, each time the * key is operated, the value of the variable B is changed, and a fill pattern is selected according to the value of B. Therefore, every time the * key is operated, the fill pattern displayed in the chart is sequentially switched to eight types as shown in FIG.

FIG. 16 shows a process performed by interruption from the navigation device 2. First, the latitude and longitude data of the ship are read from the navigation device 3 (n40). Subsequently, the dot address is calculated and written to the display memory (VRAM), and the wake pattern connecting the previous ship's position with a straight line is written (n41 → n42).

In the embodiment, the fill pattern is selected by key operation. However, for example, the illuminance around the wake display device is measured, and the fill pattern is automatically switched according to the value. It is also possible.

[0027]

According to the graphic display device of the present invention, at least one of the plurality of areas divided by the boundary line is displayed in a filled pattern, and the fill pattern can be changed. By changing the average luminance of the fill pattern, a graphic can be displayed at an optimum luminance according to the illuminance around the graphic display device. Moreover, since the boundary is displayed independently of the fill pattern, even if the average luminance of the fill pattern is reduced, the glare of the screen is suppressed without lowering the visibility of the boundary.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a track display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a display example of a display screen.

FIG. 3 is a diagram showing a display example of a display screen.

FIG. 4 is a diagram showing a display example of a display screen.

FIG. 5 is a diagram illustrating an example of a fill pattern.

FIG. 6 is a diagram showing an example of setting seed data.

FIG. 7 is a diagram showing a positional relationship between a display screen and seed data.

8A and 8B are diagrams illustrating a configuration of chart data, in which FIG. 8A is a partial configuration example in a memory card, and FIG. 8B is a partial configuration example in a RAM.

FIG. 9 is a diagram illustrating an example of setting a lowest address of a fill pattern storage memory area and the number of words of a fill pattern for a GDC;

FIG. 10 is a diagram illustrating a setting example of a filling pattern.

FIG. 11 is a diagram showing an example of setting dot addresses and boundary colors of seed data.

FIG. 12 is a flowchart showing a procedure for displaying a chart.

FIG. 13 is a flowchart illustrating a processing procedure for filling a chart.

FIG. 14 is a flowchart illustrating a processing procedure based on an interrupt from a key input unit.

FIG. 15 is a flowchart showing a processing procedure at the time of * key operation.

FIG. 16 is a flowchart showing a processing procedure by interruption from the navigation device.

[Explanation of symbols]

 A-Land B-Sea C-Coast D-Wake La-Latitude Lo-Longitude

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-115189 (JP, A) JP-A-3-295669 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01C 21/00 G01C 21/20 G09B 29/00

Claims (1)

(57) [Claims] 1. A graphic display device for displaying a graphic including a boundary line indicating a boundary between different regions, a display means for inputting a display signal and displaying the graphic with light emission, and generating display data for the boundary line. A boundary line display data writing means for writing to the display memory, and reading a state of the operation unit, and averaging each operation of the operation unit.
A fill pattern selecting unit for sequentially selecting a fill pattern in the order of luminance, and filling at least one of a plurality of regions divided by the boundary line with the pattern selected by the fill pattern selecting unit. A fill pattern display data writing unit that generates display data to be displayed and writes the display data into the display memory; and a display signal generation unit that generates a display signal from the contents of the display memory and provides the display signal to the display unit. Graphic display device.