JPH05173482A - Scroll method for navigation map - Google Patents

Abstract

PURPOSE:To remarkably shorten the time required for displaying a desired map by judging whether a scroll key is in an operating state or not by a control means, at the time point when a principal map element is displayed to a degree that the display contents can be recognized on a screen. CONSTITUTION:Based on an output of a sensor, the present position of the own car is calculated (S1), and displayed as an initial map screen centering around its position (S2). The own car position is calculated again (S3), and as a result of decision of an automatic scroll mode or not (S4), in the case of YES, a map centering around the present position is displayed (S6), and in the case the result of S4 is YES, whether the map reaches the end part of a display screen or not is decided (S7), and in the case this result is YES, the processing is migrated to S6, and on the contrary, in the case of NO, the processing is migrated to S8 together with the case when a result of decision of S5 and after passing through the processing of S6, and whether a scroll key is operated or not is decided (S8). Accordingly, in the case of scrolling continuously the display screen plural times, the processings of the steps S8-S11 are repeated by operating continuously the scroll key.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation map scrolling method in which a display screen of a display means is page-scrolled by operating a scroll key.

[0002]

2. Description of the Related Art Generally, a navigation system is constructed as shown in FIG. 2, and a direction signal from a direction sensor 1 and a traveling distance signal from a sensor 2 are controlled by interface (hereinafter referred to as IF) circuits 3 and 4, respectively. Is input to the CPU5, and based on these signals, the CPU5
The current position of the vehicle is calculated by.

On the other hand, under the control of a floppy disk (hereinafter referred to as FD) controller 6, a floppy disk drive (hereinafter referred to as FDD) device 7 is driven to
Necessary map data is read from and the CPU 5
Video RAM which is a storage means for the read map data
(Hereinafter referred to as VRAM) 8 is written in the red, green, and blue memory areas R, G, B as appropriate, and the display controller 9 reads the write data in each memory area R, G, B to read a color CRT or the like. A required map is displayed in color on the screen of the display means 10, and the current position of the vehicle calculated by the CPU 5 based on the cursor data stored in the cursor display memory area K of the VRAM 8 is displayed by the display controller 9. A cursor is displayed on the map of the means 10.

By the way, this type of navigation system has a scroll function for moving the display screen of the normal display means 10, but if the VRAM 8 has a storage capacity of one screen, so-called page scroll is performed. As shown in FIG. 2, by operating the scroll key 11 for scrolling the map in eight directions including up, down, left and right, the IF
A scroll signal is input to the key discrimination unit of the CPU 5 via the circuit 12, and a scroll command is given from the CPU 5 to the display controller 9 based on this scroll signal, and the display screen of the display means 10 is 1 /
So-called page scroll is performed so that two screens are scrolled at a time.

Reference numeral 13 is a current position display key, and when the current position of the own vehicle deviates from the display screen of the display means 10 by the above page scroll, a map centering on the current position of the own vehicle is displayed again. If desired, the display means 1 can be operated by operating the present position display key 13.
A map centering on the current position of the vehicle is displayed at 0.

When the display screen is scrolled in this manner, the screen currently displayed on the display means 10 is moved by 1/2 screen, and the map data to be displayed on the display screen after the movement is read from the FD. The data is written in each memory area R, G, B of the VRAM 8, and a new map is displayed on the display screen after movement based on the write data in each memory area R, G, B, and the scroll key 11 is operated thereafter. The same operation is repeated every time.

Further, in the map obtained by expanding the map data stored in the FD as shown in FIG. 3, it is necessary to scroll from the state where the portion corresponding to the area A is displayed to the area B four times. Need to scroll, area B
By continuing to operate the scroll key until the display shifts to, scrolling for 1/2 screen is repeated four times.

[0008]

However, in the conventional scrolling method, since every map element is displayed every time the screen is scrolled by 1/2 screen, the desired map is displayed when the scrolling is repeated as described above. It takes a long time to complete.

Therefore, the present invention has been made in order to solve the above-mentioned problems, and an object thereof is to make it possible to shorten the time required to display a desired map in page scrolling.

[0010]

A navigation map scrolling method according to the present invention displays a navigation map on a screen of a display means by a control means on the basis of map data stored in a storage means. In a navigation map scrolling method of scrolling a display screen of the display unit by a predetermined screen smaller than one screen by an operation, the display screen is scrolled by a predetermined screen by operating the scroll key, and the scrolled display screen is displayed. At the time of displaying the main map elements such as city names, main roads, etc. to the extent that the displayed contents can be recognized,
The control means determines whether or not the scroll key is in an operating state. If the scroll key is in an operating state, the display screen is further scrolled by a predetermined screen, and if the scroll key is not in an operating state, the display is made. It is characterized by displaying the remaining map elements on the screen.

[0011]

According to the present invention, the main map elements such as the names of cities, towns and villages, main roads, etc. are displayed on the display screen scrolled by a predetermined number of screens so that the displayed contents can be recognized. The screen is scrolled by a predetermined number of screens, and if the scroll key is not in the operating state, the remaining map elements are displayed on the display screen, so until the desired map is obtained, the map is in an unfinished state. Therefore, the time required to display the desired map can be shortened as compared with the case where the complete map is displayed and the screen is changed to the next display screen even in the middle of scrolling as in the related art.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is an operation flowchart of an embodiment of a scrolling method for a navigation map of the present invention.

However, since the configuration of the navigation system applied to the present invention is the same as that of FIG. 2, the following description will refer to FIG. 2 as well. Main map elements such as city names, main roads, etc. are displayed on the display screen scrolled by the screen to the extent that the display contents can be recognized, and at that time the CPU
The key determination unit 5 determines whether or not the scroll key 11 is in the operating state. If the scrolling key 11 is in the operating state, the display screen is further scrolled by 1/2 screen. If not, the remaining map elements are displayed on the display screen. The display is different.

Next, the operation during scrolling will be described with reference to FIG.
Will be described with reference to.

First, based on the outputs of both sensors 1 and 2, C
The current position of the vehicle is calculated by PU5 (step S
1), a map centered on the calculated current position is displayed on the display means 10 as an initial map screen (step S2),
After that, the current position of the own vehicle is calculated again by the CPU 5 (step S3).

Then, it is determined whether or not the automatic scroll mode is the mode in which the current position of the vehicle is always displayed on the display screen of the display means 10 by the cursor as the vehicle travels (step S4). If the determination result is NO, it is determined whether or not the current position display key is operated (step S5). If the determination result is YES, a map centering on the current position is displayed on the display means 10 ( Step S6).

On the other hand, if the decision result in the step S4 is YES, it is decided whether or not the current position has reached the end portion of the display screen of the display means 10 (step S).
7) If this determination result is YES, the process proceeds to step S6. If the determination result is NO, conversely, if the determination result in step S5 is NO and after the process of step S6, the process proceeds to step S8. Then, it is determined whether or not the scroll key 11 is operated (step S8).

If the decision result in the step S8 is YES, the display screen for 1/2 screen is scrolled in the direction designated by the scroll key 11 and the main map elements are displayed on the scrolled display screen (step In step S9, the flag of the CPU 5 is set to "1" (step S9).
10) After the time counter is cleared to 0 (step S11), the process returns to step S8. On the other hand, if the decision result in the step S8 is NO, it is decided whether or not the flag of the CPU 5 is "1" (step S8). If the determination result is YES in S12), it is determined whether or not the count value of the clock counter is equal to or greater than a predetermined value (step S13).

At this time, the clock counter is incremented by the timer interrupt processing, and the judgment of the count value of the counter is performed in step S13 when the display screen is 1 /
This is because there is a predetermined time delay after the main screen is displayed by scrolling two screens.

Then, the determination result of step S13 is YE.
If S, the remaining map elements are displayed on the display screen on which the main map elements are displayed in step S9 (step S14), the flag of the CPU 5 is reset to 0 (step S15), and then steps S12 and S13. When the determination result of each is NO, and the next step S16
Then, it is determined whether or not the current position of the vehicle is within the display screen (step S16), and the determination result is YE.
If it is S, the display of the current position of the vehicle by the cursor is updated (step S17). If the determination result is NO, the display of the current position by the cursor of the vehicle is erased when it remains on the display screen. (Step S18),
Then, after the processing of step S17
Return to 3.

Therefore, when the display screen is continuously scrolled a plurality of times, by continuously operating the scroll key 11, steps S8, S9, S10 and S11 in FIG.
The process is repeated until the desired map is obtained, but the display contents can be recognized as a map, but since it is scrolled in an incomplete state, a complete map is displayed even during scrolling as in the past. The time required to display the desired map can be shortened as compared with the case of shifting to the next display screen.

Further, in the case where it is necessary to display the map in the middle of scrolling until the desired map is displayed, in order to display the map elements of which the display content can be recognized on the scrolling display screen, Also, it is possible to accurately determine whether the map is applicable.

In the above embodiment, the case of scrolling by ½ screen is described, but the invention is not limited to ½ screen.

[0024]

As described above, according to the navigation map scrolling method of the present invention, the main map elements such as the names of cities, towns and villages, main roads, etc. are displayed to the extent that the display contents can be recognized on the display screen scrolled by the predetermined screen. If the scroll key is displayed, and the scroll key is in the operating state at that time, the display screen is scrolled by a predetermined amount.If the scroll key is not in the operating state, the remaining map elements are displayed on the display screen. Compared with the case where a complete map is displayed and the screen is moved to the next display screen even in the middle of, the time required to display a desired map can be significantly shortened, which is suitable as a navigation system.

[Brief description of drawings]

FIG. 1 is a flowchart for explaining the operation of an embodiment of a scrolling method for a navigation map of the present invention.

FIG. 2 is a block diagram of a general navigation system.

FIG. 3 is an operation explanatory diagram of a conventional navigation map scrolling method.

[Explanation of symbols]

 5 CPU 8 VRAM 10 display means 11 scroll key

Claims (1)

[Claims] 1. A navigation screen is displayed on the screen of the display means by the control means based on the map data stored in the storage means, and a predetermined screen smaller than one screen is displayed on the display screen of the display means by operating a scroll key. In a scrolling method for scrolling a map for navigation by scrolling, the display screen is scrolled by a predetermined screen by the operation of the scroll key, and the main contents such as city names, main roads, etc. When the map element is displayed, the control means determines whether or not the scroll key is in the operating state. If the scroll key is in the operating state, the display screen is scrolled by a predetermined number of screens, and the scroll key is displayed. Is not in the operating state, the remaining map elements are displayed on the display screen. Scroll method of navigation map to a butterfly.