JPH0916156A - Processor and method for map scrolling processing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the processor and method which do not cause a temporary stop resulting from the expansion of map data. SOLUTION: A scroll interval is controlled by a timer actuation means 7, a display area corresponding to one scroll is displayed on a screen by an output means 14 at constant intervals, and a map is expanded in the idle time of a timer interval. For the expansion of the map, a plotting position judgement means 11 judges a unit position to be preread in a reverse screen area divided into units in a lattice shape in the scroll direction, and a preread area plotting means expands a map of one unit. An arrival judgement means 9 decides whether or not the display area reaches the border of the preread area in the reverse screen area and when the border is reached, a reverse screen area drawing means 15 transfers a reverse plotting area obtained by shifting the map in the scroll direction including the expanded preread area to the center part of the reverse screen area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a map scroll processing apparatus and method for smoothly scrolling a digital map displayed on a display.

[0002]

2. Description of the Related Art FIG. 9 shows a schematic structure of a conventional map scroll processing method.

In FIG. 9, the display areas 3a and 3b are for outputting the map data developed in the back screen area 2a to the display screen 1a. The back screen area 2a has an arbitrary fixed size and is an area for expanding map data from the map database 4. The map database 4 has a display screen 1a
Stores a digital map for a computer that can be displayed on.

Next, the conventional operation will be described with reference to FIG. In the back screen area 2a, the display area 3a is shifted in the scroll direction at regular intervals, and the display screen 1a
By outputting to, the apparent scrolling is realized. In this case, eventually the edge of the back screen area 2a is reached like the display area 3b. At this time, the center position of the currently displayed display area 3b is newly set as the center of the back screen area 2b, and the map data within the range of the back screen area 2b is redeployed from the map database 4 and the same operation is repeated thereafter. .

[0005]

However, in the above-described conventional map drawing processing method, the display area 3 is scrolled during scrolling.
When the end of the back screen area 2a is reached as shown in b, the center position of the currently displayed display area 3b is set as the center position of the back screen area 2b in order to expand the map data collectively from the map database 4, There was a problem that the scroll paused.

The present invention solves such a conventional problem, and provides a map scroll processing device and a method thereof in which no temporary stop occurs due to the expansion of map data.

[0007]

In order to achieve the above object, the present invention provides a receiving means for receiving a scroll direction from an external input device for operating a map, and a scrolling means for scrolling at a constant interval at the start of scrolling. Map data is expanded to a pre-reading area in a back screen area having a timer starting means for starting a timer and an area (unit) divided into fixed small rectangles in units of one unit during idle time during scrolling. Pre-reading area drawing means, drawing position condition storing means that stores conditions for judging the expansion position of the unit to the pre-reading area during scrolling, and judgment conditions stored in the drawing position condition storing means with respect to the scroll direction Corresponding to the display area in the back screen area and the drawing position determination means to determine at which position in the look-ahead area the map data will be expanded Output means that displays the area to be displayed on the screen, arrival condition storage means that stores the condition that can be determined whether the display area has reached the prefetch area while scrolling, and the current display area Arrival determination means for determining whether or not the display area has reached the look-ahead area based on the determination conditions stored in the arrival condition storage means, and transferring the designated area in the back screen area to the back screen area itself. The back screen area drawing means, the rebuilding condition storage means that stores a condition for determining whether the back drawing area is in the rebuilding state, and the determination condition stored in the rebuilding condition storage means. A rearrangement determination unit that determines whether the back drawing area is in a reconstructed state is provided. Here, the rebuilding is to transfer the back drawing area, which includes the look-ahead area in which the map has been developed, and which is offset in the scroll direction, to the center of the back screen area.

[0008]

Therefore, according to the present invention, the scroll interval is controlled by the timer starting means, and the display area is displayed on the screen at regular intervals. The arrival determination means determines whether or not the display area has reached the boundary of the prefetch area in the back screen area, based on the condition stored in the arrival condition storage means. When the prefetch area has not been reached, the output means outputs the display area corresponding to one scroll to the screen and expands the map data during the idle time of the remaining timer. When expanding the map data, the drawing position judgment means determines the prefetch unit position of the back screen area divided into a grid for each unit according to the condition stored in the drawing position condition storage means with respect to the scroll direction. The map data for one unit is developed by the prefetch area drawing means. When the display area reaches the boundary of the prefetch area in the back screen area in the arrival determination means, the reconstruction determination means determines the reconstruction state of the back rendering area according to the condition stored in the reconstruction condition storage means. The determination is made, and the back screen area drawing means reconstructs the back drawing area. If the display area has reached the boundary of the look-ahead area by the arrival determination means, but the map data of the corresponding look-ahead area has not been expanded by the drawing position determination means, the expansion of the map data is completed. Repeat until.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A map scroll processing device of the present invention will be described with reference to FIG.

In FIG. 1, an external input device 5 is a dedicated device such as a keyboard and a tablet device for performing map operation, and produces signals such as map coordinates and scroll direction. The receiving means 6 receives the signal created by the external input device 5. The timer starting means 7 controls the scroll interval to be constant by starting a timer. The arrival condition storage means 8 stores a condition for determining whether or not the display area has reached the prefetch unit area.
The arrival determination means 9 determines the arrival of the display area in the prefetch area based on the conditions stored in the arrival condition storage means 8.

The drawing position condition storage means 10 stores the condition for judging the unit position where the map data in the prefetch area is developed. The drawing position determination means 11 determines the unit position of the prefetch area based on the conditions stored in the drawing position condition storage means 10. Prefetch area drawing means 16
Expands the map data to the look-ahead unit.

The output means 14 outputs an area corresponding to the display area in the back drawing area to the external display device 17. The reconstruction condition storage means 12 stores conditions for determining the reconstruction state of the back drawing area. The reconstruction determining unit 13 determines the reconstruction state of the back drawing area based on the condition stored in the reconstruction condition storing unit 12. The back-drawing area drawing processing means 15 transfers the back-drawing area including the read-ahead area of the map developed to the center of the back-screen area.

Next, the relationship between the unit and the display area is shown in FIG.
This will be described with reference to FIG. In FIG. 2, the unit is a basic unit obtained by dividing the map data into small rectangular areas, and here,
The size is 440 × 360 pixels. Although the display area is determined according to the size of the display device, a display area of 1280 × 960 pixels is used here.

When the center of the central unit of the display screen is made to correspond to the center coordinates of the display screen as shown in FIG. 2, the size of the display area is almost close to the size of 3 × 3 units.
Considering the minute movement of the center position of the display area, the unit size required for the display area is at least 4 × 4 unit size.

Next, each unit area of the back screen area will be described with reference to FIG. In FIG. 3, the display area is an area for outputting to the screen, and the 4 × 4 unit size from FIG. 2 is the minimum necessary unit area for outputting the display area. On the other hand, the back screen area is 5
This is an area having a total of 7 × 7 unit size, which is composed of a back drawing area having a × 5 unit size and a prefetch area around it. This back drawing area is a unit area necessary for outputting the area corresponding to the display area to the screen when scrolling. The pre-reading area is an area in which map data is sequentially developed in the pre-reading area corresponding to the scroll direction during scrolling.

Next, the operation of the map scroll processing apparatus of the present embodiment configured as described above will be described with reference to FIGS. 4, 5, 6 and 7 by taking the left scroll as an example. A left scroll signal for map operation is created using the external input device 5. The receiving means 6 receives the left scroll signal generated by the external input device 5 (step S1). The timer is activated by the timer activation means 7 (step S2). The arrival determination means 9 determines whether or not the display area to be output to the screen has reached the prefetch area according to the conditions fetched from the arrival condition storage means 8 (step S3). Here, if the condition of the reaching condition storage means 8 is not satisfied, 1
The display area shifted to the left by the scroll amount is output from the back screen area to the screen by the output means 14 (step S4). The drawing position judging means 11 judges whether or not the map development is completed in the prefetch area corresponding to the left scroll, based on the condition fetched from the drawing position condition storing means 10 (step S).
5). Here, when the conditions of the drawing position condition storage means 11 are not satisfied, the prefetch area drawing means 16 expands one unit of map data from the map database (step S6).

The above series of operations will be described with reference to FIG. In the back screen area 18 having a size of 7 × 7 units, there is a back drawing area 19 having a size of 5 × 5 units in which map data has been developed in advance. In addition, there is a display area corresponding to the display screen 20a.

The display area 21a drawn with a solid line is a display area when the display area 21b drawn with a dotted line is moved one scroll to the left. The pre-reading areas 22a to 22e are pre-reading areas for the left scroll described in FIG. 8 of the dictation, and after the display area is transferred to the display screen 20a until the display area reaches this pre-reading area, map data is displayed for each unit. Deploy.

In FIG. 4, when the condition of the reaching condition storing means 8 shown in step S3 is satisfied, the drawing position judging means 11 judges the drawing completion of the prefetch unit area based on the condition taken out from the drawing position condition storing means 10. To do.
(Step S7). Here, the drawing position condition storage means 10
If the condition (4) is satisfied, the reconstructing judging means 13 judges whether or not the back drawing area reconstruction is in progress, based on the condition retrieved from the reconstructing condition storing means 12 (step S8).
If the conditions of the reconstruction condition storage means 12 are not satisfied, the output means 14 outputs the display area in the back screen area to the display screen (step S9). After that, the back drawing area drawing means 15 shifts and transfers the upper half of the back drawing area including the prefetch area to the back screen area itself (step S10).

The series of operations described above will be described with reference to FIG. If the dotted line display area 21c reaches the prefetch area and the map data has been developed in the units of the prefetch areas 22a to 22e, first, the display area 21d shifted left by one scroll is displayed on the display screen 20b. Forward.
After that, the upper half of the back screen area 18 including the read-ahead area 5
The part corresponding to × 2.5 units is shifted to the right by one unit and transferred. As a result, the upper half back drawing area 23a is newly reconstructed.

In FIG. 4, when the conditions of the reconstruction condition storage means 12 shown in step S8 are satisfied, the output means 1
By 4, the display area in the back screen area is vertically shifted and output to the display screen (step S11). After that, the back drawing area drawing means 15 shifts and transfers the lower half of the back screen area to the back screen area itself (step S12).

The above series of operations will be described with reference to FIG. Since the display area displayed on the screen in FIG. 6 is shifted by one unit in the vertical direction, when scrolling, the upper half display area 24a is first shifted to the left by one scroll and transferred to the display screen 20c. The half display area 24b is shifted to the left by one scroll and transferred to the display screen E20c. After that, the lower half back drawing area 23b corresponding to 5 × 2.5 units of the lower half including the prefetch area is shifted to the right by one unit and transferred, whereby a new back drawing area 25 is constructed.

In FIG. 4, when the condition fetched from the drawing position condition storing means 10 shown in step S7 is not satisfied, the display area to be output to the display screen is not prepared yet. It repeatedly develops from the map database for all the pre-reading units that require the expansion of map data (step S1).
3).

The condition stored in the arrival condition storage means 8 is whether the boundary coordinates of the display area and the boundary coordinates of the read-ahead area are compared to determine whether the display area has reached the read-ahead area.

The conditions for determining the prefetch area stored in the drawing position condition storage means 10 will be described with reference to FIG.

As shown in FIG. 8, the look-ahead unit area for the scroll direction is managed by an internal table uniquely determined. In the case of the left scroll, the prefetch unit positions are 5 units 26a to 26e.

The conditions stored in the reconstructing condition storing means 12 are the number of times for performing the reconstructing set in advance in order to determine whether the back drawing area is in the reconstructing state, and the reconstructing time. The number of times is compared to see if the back drawing area is in the reconstructed state.

As described above, according to the present embodiment, by activating the scroll interval by the timer, the scroll display is smoothed, and at the idle time of the timer, the prefetch area in the back screen area is read from the map database for each unit. By expanding the map, there is an effect that the temporary stop does not occur due to the collective expansion of the map.

Although the transfer screen division method is divided into two in this embodiment when the back drawing area is reconstructed, there is no problem even if it is more than that. Especially when using a display device of different resolution and increasing the size of one unit,
Although the transfer time is long with each screen division, smooth transfer can be performed by dividing the screen division method into multiple stages.

[0030]

As apparent from the above embodiment, the present invention expands the map data in units of units divided into small rectangular areas in the back screen area, and the center of the conventional display area is used as the back screen area. Corresponding to the center of the map data and expanding the map data based on the center position of the map drawing method, applying the back drawing area and the look-ahead area in a 7 × 7 unit grid pattern and expanding the map data to the corresponding position. As a result, there is an effect that the map data can be expanded without waste so that all the map data can be stored in the grid-shaped area.

Further, in the present invention, the newly required map data development time for the scroll direction is
By distributing each unit of map data in advance by the scroll interval idle time, there is an effect that an apparent pause due to the expansion of the map data does not occur. Further, by activating a timer for controlling the scroll interval, there is an effect that a smooth scroll with a constant scroll display interval can be realized.

Further, in the present invention, in order to infinitely expand the map data newly required in the scroll direction into the prefetch area, the map data of 5 × 5 unit size including the map data already expanded in the prefetch area is provided. The area is transferred to the center of the back drawing area. However, if the area is transferred in one scroll process, the area becomes larger than the scroll interval and an apparent pause occurs. Therefore, the 5 × 5 unit is divided into upper and lower parts and divided into two scroll processes for transfer, and the transfer interval is set smaller than the scroll interval, so that an apparent pause due to transfer in the back screen area does not occur. Have.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a map scroll processing device according to an embodiment of the present invention.

FIG. 2 is a relationship diagram between a unit and a display area in this embodiment.

FIG. 3 is an explanatory diagram of a back screen area in the present embodiment.

FIG. 4 is a flowchart showing a processing procedure of the map scroll processing device in the embodiment of the present invention.

FIG. 5 is an explanatory diagram of prefetch unit drawing in the present embodiment.

FIG. 6 is an explanatory diagram of reconstruction of a back drawing area in the present embodiment.

FIG. 7 is an explanatory diagram of reconstruction of a back drawing area in the present embodiment.

FIG. 8 is an explanatory diagram of a look-ahead area for each scroll direction according to the present embodiment.

FIG. 9 is an explanatory diagram of a conventional map scroll processing method.

[Explanation of symbols]

 5 external input device 6 receiving means 7 timer starting means 8 arrival condition storing means 9 arrival determining means 10 drawing position condition storing means 11 drawing position determining means 12 reconstruction condition storing means 13 reconstruction determining means 14 output means 15 back drawing area drawing Means 16 prefetch area drawing means 17 external display device

Claims (6)

[Claims] 1. A receiving means for receiving a scroll direction from an external input device for operating a map, a timer starting means for starting a timer at the start of scrolling for scrolling at fixed intervals, and a fixed small rectangle. Pre-reading area drawing means for expanding the map data to the pre-reading area in the back screen area having the specified area (unit) in units of one unit during the idle time during scrolling, and the expansion of the unit into the pre-reading area during scrolling. A drawing position condition storage means that stores a condition for judging the position and a judgment condition stored in the drawing position condition storage means with respect to the scroll direction are used to judge at which position in the prefetch area the map data is to be expanded. Drawing position determining means, an output means for displaying an area corresponding to the display area in the back screen area on the screen, and a screen. Pre-reading is performed by the arrival condition storage means that stores the condition for determining whether or not the display area has reached the pre-reading area during roll, and the judgment condition stored in the arrival condition storage means for the current display area. Arrival determining means for determining whether the display area has reached the area, and back screen area drawing means for transferring the designated area in the back screen area to the back screen area itself,
The rear drawing area is in the reconstructed state according to the reconstructing condition storage means that stores a condition for determining whether the back screen area is in the reconstructed state and the determination condition stored in the reconstructed condition storage means. A map scroll processing device comprising a reconstruction determination means for determining whether or not. 2. The map scroll processing device according to claim 1, wherein the map data is expanded into a grid-shaped back screen area having a size larger than that of the display screen by using a small rectangular shape which is a basic unit of the map data. A map scroll processing device that expands the map data efficiently by applying the unit to the back screen area. 3. The map scroll processing device according to claim 1, wherein the map is scroll-displayed by changing the display area in the back screen area corresponding to the display screen by a constant width in the scroll direction, By displaying the change display for each fixed width at a fixed interval with the hardware timer,
A map scroll processing device that realizes smooth scrolling at a constant speed. 4. The map scroll processing device according to claim 1, wherein the difference between the timer interval and the map display processing on the screen is in the idle state, and the idle state is scrolled to the prefetch area in the back screen area. A map scroll processing device that realizes smooth scrolling by constantly preparing the map in the traveling direction by gradually expanding the range of the map in the direction. 5. The map scroll processing device according to claim 1, wherein the reconstruction of a new back drawing area including an area in which map data is expanded during scrolling is performed by transferring the back drawing area in multiple stages. , A map scroll processing device with no apparent pause. 6. A scroll start interval is controlled by a timer starting means to display a display area on the screen at a constant interval, and an arrival judging means for determining whether or not this display area reaches the boundary of the prefetch area in the back screen area. If the prefetch area is not reached, the display means outputs the display area corresponding to one scroll to the screen, expands the map data in the idle time of the remaining timer, and expands the map data when The drawing position determination means determines the look-ahead unit position of the back screen area divided into a grid pattern in the scroll direction, and the look-ahead area drawing means expands the map data for one unit, and the display area becomes the back screen area. When the boundary of the pre-reading area in the inside is reached, the reconstruction judging means judges the reconstruction state of the back drawing area, and the back screen area drawing means reconstructs the back drawing area. How to handle map scrolling.