JP4339231B2 - Map display device - Google Patents

Description

  The present invention relates to a map display device used in, for example, a navigation system, and more particularly to a technique for controlling the scrolling of a map.

  2. Description of the Related Art Conventionally, a navigation system that is mounted on a vehicle and guides a driver to a destination with a map displayed on a map display device is known. In such a navigation system, it is necessary to change the display state of the map in response to a user request such as to know details of the destination and the vicinity of the current location, or to know the route from the current location to the destination. As a method for changing the display state of the map, there are a method of scrolling so that a desired place is located near the center of the screen, and a method of changing the scale of the map to display an enlarged screen or a reduced screen.

  As such a map display device, for example, Patent Document 1 discloses a map display device that makes it easy to understand the mutual correspondence in a two-screen display mode that displays a detailed map and a wide area map. This map display device includes a storage means for storing map data and guidance data relating to route search and route guidance, an input means for inputting instructions and information for route search and route guidance, and a map and guidance screen relating to route search and route guidance. Display means for switching between a one-screen display mode and a two-screen display mode in which the screen is divided, and a display for controlling the guidance screen for reading the guidance data from the storage means and displaying it on the display means in response to an input command of the input means And a control means for displaying a frame at a position corresponding to the detailed map on the wide area map with respect to the wide area map and the detailed map displayed in the two-screen display mode.

  Patent Document 2 discloses a navigation device that scrolls a map while clarifying the positional relationship between a vehicle position mark and a cursor mark (map center coordinates). This navigation device automatically displays a map image of a different scale that can be displayed on the same screen when the vehicle position mark and the cursor mark cannot be displayed in the map image of a predetermined scale by the scroll operation of the user. change. Further, when the scroll operation is continued and the cursor mark and the vehicle position mark can no longer be displayed at other scales, the map image is changed to a map image of another scale at which both marks can be displayed.

  Further, Patent Document 3 discloses a navigation device that can provide a user with information such as where an intersection or the like that needs to change the traveling direction next exists by a simple operation. When there is an instruction from the user, the navigation device includes a search unit that searches for a point that satisfies a predetermined condition from a predetermined region, and if the corresponding point P is found, the navigation device includes the point P on the display screen. First scroll means for scrolling the map so that the map is displayed, and first return to return to the original state before scrolling at a predetermined timing after the map including the point P is displayed by scrolling Means. This navigation device performs a point search (next guidance point, etc.) within a certain range from the vehicle position, and automatically scrolls the map to the search point when certain conditions are met. In addition, the scale of the map is automatically changed during scrolling so that the vehicle position and the scroll cursor position fit on one screen.

Japanese Patent Laid-Open No. 11-52844 JP 2002-286467 A JP 2002-357426 A

  However, the map display device described in Patent Document 1 described above only shows the position of the detailed map on the wide area map in the area frame to clarify the relationship between the left and right screens. The area cannot be displayed. In addition, the navigation device described in Patent Document 2 can automatically change the scale of the map during manual scrolling, but cannot change the scale of the map referred to by scrolling in the past and display it. Furthermore, the navigation device described in Patent Document 3 can automatically display a map between two points from the position of the traveling vehicle to the search point, but cannot reproduce the user's scrolling operation. It is not possible to change and display the scale of a map that has been referenced by scrolling in the past. Therefore, a map display device excellent in usability that can reproduce a map referred to by scrolling in the past is desired.

  The present invention has been made to meet the above-described demand, and an object thereof is to provide an easy-to-use map display device that can reproduce a map referred to by scrolling in the past.

A map display device according to the present invention includes a map information acquisition unit that acquires map information, a display unit that displays a map, an input unit that inputs an instruction by an operation, and a scroll instruction that is input by an operation of the input unit. comprising storage means for storing as a scroll history data, in response to a wide area display scale change instruction to the predetermined scale input by operating the input means, thereby drawing a map of a predetermined scale, read from the storage means Based on the scroll history data, a display area frame at the start of scrolling and a display area frame representing the range of the map displayed on the display unit at the end of scrolling are created, and the display input by operating the input unit And a display control means for drawing both frames on the map of the predetermined scale with the position as the center .

According to the present invention, in accordance with the wide-angle display scale change instruction to predetermined scale input by operating the input means, thereby drawing a map of a predetermined scale, the scroll history data read from the memory means Based on the display area frame at the start of scrolling and the display area frame representing the range of the map displayed on the display unit at the end of scrolling , centered on the display position input by the operation of the input unit, Since both frames are drawn so as to overlap on the map of the predetermined scale, it is possible to confirm the area of the map that has been referred to in the past, and at the same time, the area of the map that has not yet been referred to. Therefore, when searching for a point by scrolling the map, the following two effects can be obtained by clarifying the area that has already been referred to by scrolling. The first effect is that when the target point has not been found by the previous scrolling and the search is continued thereafter, there is no need to scroll through the already searched area. Squeezed. The second effect is that when the target point is found in the previous scroll and the same point is searched again, the area to be scrolled is narrowed down.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a map display device according to Embodiment 1 of the present invention. The map display device includes an input unit 10, a display unit 11, a map information acquisition unit 12, a storage unit 13, and a display control unit 14.

  The input unit 10 includes, for example, a joystick and operation buttons provided on the operation panel of the map display device and a remote controller, and a touch panel provided on the display screen of the display unit 11. This input means 10 is used for accepting user operations such as scrolling the map displayed on the screen of the display means 11, setting the scale of the map to be displayed on the screen, and selecting from a menu. Operation data generated by operating the input means 10 is sent to the display control means 14.

  The display means 11 is composed of, for example, a liquid crystal panel. According to the display data sent from the display control means 14, a map (including function switches in the screen), menus, and other various messages are displayed on the screen. Is displayed. The map information acquisition means 12 is, for example, from a large capacity storage (including removable media) such as a CD (Compact Disc), DVD (Digital Versatile Disk), HDD (Hard Disk Drive), or from an external server via a communication device. Get map information. The map information acquired by the map information acquisition unit 12 is sent to the display control unit 14.

  The storage unit 13 is composed of, for example, a RAM (Random Access Memory), and is used by the display control unit 14 to temporarily store data. This storage means 13 stores, for example, scroll history data representing the history of scroll operations performed by the user and display area frame data defining the display mode of the display area frame drawn on the map. The scroll history data is based on initial data consisting of the center position (latitude / longitude) and scale of the map displayed on the screen, scroll operation data consisting of the scroll direction and movement amount, and management data including the title and operation date / time. It is configured. The display area frame data is selected by a mode selection menu for the display area frame (details will be described later).

  The display control means 14 is composed of, for example, a microcomputer, and triggered by operation data sent from the input means 10, the map information from the map information acquisition means 12, the scroll history data from the storage means 13, and the display area Based on the frame data, a process of drawing a map or menu on the display means 11 is executed. The display control unit 14 includes a display center calculation unit 20, a display scale calculation unit 21, an area frame calculation unit 22, a menu control unit 23, and a map drawing control unit 24.

  The display center calculation means 20 calculates the center coordinates of the map to be displayed based on the scroll operation data included in the operation data sent from the input means 10 or the data sent from the map drawing control means 24. The center coordinates calculated by the display center calculating means 20 are sent to the map drawing control means 24.

  The display scale calculation means 21 calculates the scale of the map to be displayed based on the scale change data instructing the scale change or the data sent from the map drawing control means 24 included in the operation data sent from the input means 10. After the calculation or the scroll operation, a scale is calculated such that the map displayed on the display unit 11 at the start of scrolling and at the end of scrolling is fully displayed on the screen of the display unit 11. The scale and scale calculated by the display scale calculation means 21 are sent to the map drawing control means 24.

  The area frame calculation means 22 displays each display area frame before and after scrolling on the map in the screen in the scale change operation after the scroll operation, or based on the data sent from the map drawing control means 24. The display center position of the display area frame and the size of the frame are calculated. The display center position and the frame size calculated by the area frame calculation unit 22 are sent to the map drawing control unit 24. As a display method of the display area frame, it is possible to employ surrounding with a transparent color frame, changing a color by painting, blinking, changing lightness, highlighting, and the like. In addition, it can also comprise so that a user may select either of these display methods.

  The menu control means 23 controls the mode selection menu for the display area frame and the history list menu for scroll operations. Specifically, the display unit 11 displays the menu by sending the mode selection menu of the display area frame and the history list menu of the scroll operation to the map drawing control unit 24, and selects according to the operation data from the input unit 10. The item in the menu is sent to the map drawing control means 24.

  The map drawing control unit 24 draws a map, a display area frame, a menu, and the like based on data sent from the display center calculation unit 20, the display scale calculation unit 21, the area frame calculation unit 22, and the menu control unit 23. Generate display data. The display data generated by the map drawing control unit 24 is sent to the display unit 11. Thereby, a map, a display area frame, a menu, etc. are displayed on the screen of the display means 11.

  Next, the operation of the map display device according to Embodiment 1 of the present invention configured as described above will be described.

(1) Scrolling operation of map screen First, the operation when the scrolling operation of the map screen is performed will be described with reference to the flowchart shown in FIG.

  First, when the user starts the map scroll operation by operating the input means 10, the scroll start position and the scale are stored (step ST11). That is, the central position (latitude / longitude) and scale of the map displayed on the screen of the display unit 11 immediately before starting the scroll operation are stored in the storage unit 13 as initial data. Thereafter, the process enters a state of waiting for an input operation by the user for a predetermined time (step ST12). Then, after a certain period of time has passed, it is checked whether or not an instruction to continue scrolling or change the scroll direction is given by operating the input means 10 (step ST13). Specifically, it is checked whether or not operation data specifying a scroll direction and a movement amount is input from the input means 10.

  If it is determined in this step ST13 that an instruction to continue scrolling or change the scroll direction is given, then a map screen scrolling process is executed (step ST14). In this map screen scrolling process, the display center calculation means 20 calculates the display center position according to the operation data (scroll direction and movement amount) from the input means 10 and sends it to the map drawing control means 24, and the map drawing control means 24. Moves the map to the display center position sent from the display center calculation means 20 and redraws the map. Thereby, the display range of the map screen is moved by the movement amount designated in the scroll direction designated by the operation data.

  Next, the scroll operation history is stored (step ST15). That is, the scroll operation data (scroll direction and movement amount) used in step ST14 is stored in the storage means 13 as scroll history data. Thereafter, the sequence returns to step ST12, and the above-described processing is repeated.

  During the repeated execution of steps ST12 to ST15, if it is determined in step ST13 that no instruction to continue scrolling or change the scroll direction is instructed, it is recognized as a break of one scroll operation at that time, and scrolling is performed. The history list is stored (step ST16). That is, a series of scroll operation data (scroll direction and movement amount) stored in the storage means 13 and initial data (the center position (latitude / longitude) and scale of the map displayed on the screen at the start of the scroll operation) Are grouped and stored in the storage means 13 as one piece of scroll history data constituting the scroll history list. At this time, management data including a title and operation date / time is added to each scroll history data.

  Next, a function switch is displayed (step ST17). As shown in FIG. 8, the function switch is displayed at the bottom of the screen, and includes, for example, switches of “END”, “AUTO SCROLL”, and “AUTO SCALE”. The user can select a desired function by touching a function switch, that is, touching a touch panel constituting the input unit 10. Next, a functional operation is executed (step ST18). In this function operation, processing corresponding to the function switches of “END”, “AUTO SCROLL”, and “AUTO SCALE” shown in FIG. 8 is executed (details will be described later).

  When the above function operation is completed, the function switch at the bottom of the screen is erased (step ST19). When the display area frame is displayed on the map, the display area frame is also deleted. The process for the scroll operation on the map screen is thus completed.

(2) Scroll History List Operation Next, the operation when the scroll history list is operated will be described with reference to the flowchart shown in FIG.

  When the user starts operating the scroll history list by operating the input means 10, first, data of the scroll history list is read (step ST21). That is, the menu control unit 23 reads a plurality of scroll history data from the scroll history list stored in the storage unit 13. Next, a list display is performed (step ST22). Specifically, as shown in FIG. 11, a plurality of scroll history data read in step ST21 is displayed in a list format as a history list menu for scroll operations. Thereafter, the process waits for a list selection (step ST23).

  When the user selects any scroll history data using the input means 10 in the list selection waiting state, the scroll history data is read (step ST24). That is, the map drawing control unit 24 reads the selected scroll history data from the storage unit 13. Subsequently, map display is performed (step ST25). That is, the map drawing control means 24 takes out the scroll history data initial data read in step ST24, and draws the map based on the map center position (latitude / longitude) and scale specified by the initial data. Thereby, the map when the scroll operation is started is displayed on the display means 11.

  Next, a function switch is displayed (step ST26). The function switch is displayed at the bottom of the screen, as in the case of the above-described map screen scrolling operation, and includes, for example, “end”, “automatic scroll”, and “automatic scale” switches (see FIG. 8). ). Next, a functional operation is executed (step ST27). In this function operation, processing corresponding to the function switches of “END”, “AUTO SCROLL”, and “AUTO SCALE” is executed (details will be described later).

  When the above function operation is completed, the function switch at the bottom of the screen is deleted (step ST28). When the display area frame is displayed on the map, the display area frame is also deleted. Thus, the process for the scroll history list operation ends.

(3) Outline of Function Operation Next, the operation when the function operation is performed in step ST18 of FIG. 2 and step ST27 of FIG. 3 will be described with reference to the flowchart shown in FIG.

  First, it enters a state of waiting for an input operation by the user for a predetermined time (step ST31). Then, after a predetermined time has passed, it is checked whether or not the scale changing operation has been performed by the input means 10 (step ST32). That is, the map drawing control unit 24 checks whether or not the operation data from the input unit 10 represents a scale change. If it is determined in step ST32 that a scale change operation has been performed, a scale change process is performed (step ST33). Details of the scale change processing will be described later. Thereafter, the sequence proceeds to step ST34. If it is determined in step ST32 that the operation for changing the scale has not been performed, the process in step ST33 is skipped, and the sequence proceeds to step ST34.

  In step ST34, it is checked whether or not an automatic scale operation has been performed by the input means 10. That is, the map drawing control unit 24 checks whether the “auto scale” switch of the function switch displayed on the screen is touched based on the operation data from the input unit 10. If it is determined in step ST34 that an automatic scale operation has been performed, an automatic scale display process is performed (step ST35). Details of the automatic scale display processing will be described later. Thereafter, the sequence proceeds to step ST36. If it is determined in step ST34 that the automatic scale operation has not been performed, the process of step ST35 is skipped, and the sequence proceeds to step ST36.

  In step ST36, it is checked whether or not the scroll reproduction operation has been performed by the input means 10. That is, the map drawing control unit 24 checks whether the “automatic scroll” switch of the function switch displayed on the screen is touched based on the operation data from the input unit 10. If it is determined in step ST36 that a scroll reproduction operation has been performed, scroll reproduction processing is performed (step ST37). Details of this scroll reproduction processing will be described later. Thereafter, the sequence proceeds to step ST38. If it is determined in step ST36 that the scroll playback operation has not been performed, the process of step ST37 is skipped, and the sequence proceeds to step ST38.

  In step ST38, it is checked whether or not an end operation has been performed by the input means 10. If it is determined in step ST38 that the end operation has been performed, the process for the function operation ends. On the other hand, if it is determined that the end operation has not been performed, the sequence returns to step ST31 and the above-described processing is repeated.

(4) Scale Change Process Next, details of the scale change process performed in step ST33 of FIG. 4 described above will be described with reference to the flowchart shown in FIG.

  First, a map at the changed scale is drawn (step ST41). That is, the map drawing control unit 24 calculates the scale of the currently displayed map by the display scale calculation unit 21 in accordance with the user's designation from the input unit 10 while maintaining the display center position of the current map. Change to a different scale and redraw. Next, the display mode of the display area frame is read (step ST42). That is, the map drawing control unit 24 reads out display area frame data defining the display mode of the display area frame from the storage unit 13.

  Next, scroll history data is read (step ST43). That is, the map drawing control means 24 reads the scroll history data from the storage means 13, acquires the initial data (the center position and scale of the map at the start of scrolling) and the management data contained therein, and the area frame calculation means 22

  Next, a scroll area frame is calculated (step ST44). That is, the area frame calculation unit 22 calculates the display area frame at the start of scrolling and the display area frame at the end of scrolling based on the scroll history data sent from the map drawing control unit 24. Depending on the display mode (details will be described later), the locus of the display area frame from the display area frame at the start of scrolling to the display area frame at the end of scrolling is also calculated.

  Next, a scroll area frame is displayed (step ST45). That is, the map drawing control means 24 draws the display area frame at the start of scrolling and the display area frame at the end of scrolling on the map so as to overlap each other. Thereby, when the scale change to the wide area display is instructed, as shown in FIG. 9, the display area frame at the start of scrolling and the display area frame at the end of scrolling are displayed on the map. Depending on the display mode, the locus of the display area frame from the display area frame at the start of scrolling to the display area frame at the end of scrolling is also displayed.

With the above processing, if the scale change to the wide area display is instructed after the scroll operation, the display area frame at the start and end of the scroll will be displayed on the map displayed in the wide area. It is possible to easily check the area of the displayed map.
(5) Automatic Scale Display Processing Next, details of the automatic scale display processing performed in step ST35 of FIG. 4 described above will be described with reference to the flowchart shown in FIG.

  First, the display mode of the display area frame is read (step ST51). That is, the map drawing control unit 24 reads out display area frame data defining the display mode of the display area frame from the storage unit 13. Next, scroll history data is read (step ST52). That is, the map drawing control unit 24 reads the scroll history data from the storage unit 13, and includes initial data (the center position and scale of the map at the start of scrolling), scroll operation data (scroll direction and movement amount), and Management data is acquired and sent to the display center calculation means 20 and the display scale calculation means 21.

  Next, the display center position and the scale are calculated (step ST53). That is, the display center calculation means 20 calculates the display center position based on the map position at the start of scrolling and the map position at the end of scrolling. The display scale calculation means 21 takes into account the scale when the scroll operation is performed in addition to the map position at the start of scrolling and the map position at the end of scrolling, and displays the scale at the start and end of scrolling. A scale is calculated such that the displayed map is fully displayed on the screen of the display means 11.

  Next, the map is displayed according to the map display center position and scale calculated in step ST53 (step ST54). That is, the map drawing control unit 24 redraws the map according to the display center position received from the display center calculation unit 20 and the scale received from the display scale calculation unit 21. As a result, as shown in FIG. 11, the map displayed on the display unit 11 at the start of scrolling and at the end of scrolling is fully displayed on the screen of the display unit 11.

  Next, a scroll area frame is calculated (step ST55). That is, the area frame calculation unit 22 calculates the display area frame at the start of scrolling and the display area frame at the end of scrolling based on the scroll history data sent from the map drawing control unit 24. Depending on the display mode (details will be described later), the locus of the display area frame from the display area frame at the start of scrolling to the display area frame at the end of scrolling is also calculated.

  Next, a scroll area frame is displayed (step ST56). That is, the map drawing control means 24 draws the display area frame at the start of scrolling and the display area frame at the end of scrolling on the map so as to overlap each other. As a result, as shown in FIG. 11, the display area frame at the start of scrolling and the display area frame at the end of scrolling are displayed on the map fully displayed on the screen of the display means 11. Depending on the display mode, the locus of the display area frame from the display area frame at the start of scrolling to the display area frame at the end of scrolling is also displayed.

With the above processing, the map displayed on the screen from the start of scrolling to the end of scrolling is fully displayed on the screen of the display unit 11 together with the display area frame, so that it is clearer than when displayed by the scale change operation described above. Display becomes possible.
(6) Scroll Playback Process Next, details of the scroll playback process performed in step ST37 of FIG. 4 described above will be described with reference to the flowchart shown in FIG.

  When the scroll playback operation is performed by the function operation in the operation of the scroll history list described above, a map including function switches such as “END”, “FORWARD”, and “RETURN” at the bottom of the screen as shown in FIG. Is displayed. In this state, the apparatus enters a state of waiting for an input operation by the user for a predetermined time (step ST61). Then, after a certain period of time has passed, it is checked whether or not a forward (or reverse) direction reproduction operation has been performed by the input means 10 (step ST62). In step ST62, a forward (or reverse) direction reproduction operation has been performed, that is, the “forward” (or “reverse”) function switch has been selected by touching the touch panel constituting the input means 10. If it is determined, the scroll history data is read (step ST63). That is, the map drawing control unit 24 reads the scroll history data from the storage unit 13, and includes initial data (the center position and scale of the map at the start of scrolling), scroll operation data (scroll direction and movement amount), and Management data is acquired and sent to the display center calculation means 20.

  Next, the display center position is moved in the forward (reverse) direction (step ST64). In other words, the display center calculation means 20 calculates the display center position to be drawn next based on the scroll history data. Next, the map is redrawn (step ST65). That is, the map drawing control means 24 redraws the map based on the display center position calculated in step ST64. Thereby, the map displayed on the display means 11 is moved by the distance indicated by the movement amount in the direction indicated by the scroll operation data.

  Next, it is checked whether or not the reproduction is completed up to the end (step ST66). If it is determined that the reproduction has not been completed up to the end, the sequence returns to step ST64 and the automatic scrolling is continued. On the other hand, when it is determined in step ST66 that the reproduction has been completed to the end, the automatic scrolling is stopped, the sequence returns to step ST61, and the above-described processing is repeated.

  If it is determined in step ST62 that the forward (or reverse) direction reproduction operation has not been performed, it is next checked whether or not the scale changing operation has been performed by the input means 10 (step ST67). Here, if it is determined that a scale change operation has been performed, the scale of the map is changed to a new scale designated by the user and redrawn with the current display center position unchanged (step ST68). . On the other hand, when it is determined in step ST67 that the operation for changing the scale has not been performed, the scroll reproduction process ends.

(7) Display Area Frame Selection Operation Next, an operation when a display area frame selection operation is performed will be described (note that the flowchart is omitted). When the user operates the input means 10 to start an operation for selecting a display area frame, first, a mode selection menu for the display area frame is displayed. That is, the menu control means 23 displays a mode selection menu for the display area frame as shown in FIG. 13 by sending predetermined display data to the display means 11. In the mode selection menu of the display area frame, the user can select “display start / end”, “display area frame at start / end” or “start to end (including midway), display area frame”. One of the two display modes can be selected.

  Thereafter, the display mode selection waits for input. When the user selects one of the input means 10 using the input means 10 in this input wait state, the selected display mode is stored in the storage means 13. The display mode stored in the storage means 13 is read out in the scale change process or the automatic scale display process described above and used to determine the display mode of displaying the display area frame.

  As described above, according to the map display device of the first embodiment of the present invention, the scroll instruction input by the operation of the input unit 10 is stored in the storage unit 13 as the scroll history data, and the input unit When an instruction to change the scale to the wide area display is given by the operation 10, based on the scroll history data stored in the storage means 13, the map displayed on the display means 11 at the start of scrolling and at the end of scrolling is displayed. Since the display area frame representing the range is created and drawn on the map displayed in a wide area by changing the scale, the area of the map scrolled in the past can be confirmed. This also confirms the area of the map that has not scrolled in the past. Therefore, when searching for a point by scroll operation, the following two effects can be obtained by clarifying the area already displayed by scroll, that is, the operation history. The first effect is that if the target point has not been found by the previous scroll operation and the search is continued thereafter, the area of the map to be scrolled thereafter is narrowed down. That is, it is not necessary to scroll the already searched area. The second effect is that when the target point is found in the previous scroll operation and the same point is searched again, the area to be scrolled is narrowed down.

  In addition, the scroll instruction input by the continuous operation of the input unit 10 is sequentially stored in the storage unit 13 as scroll history data, and the scale change instruction to the wide area display input by the operation of the input unit 10 is used. Accordingly, based on the scroll history data sequentially read from the storage means 13, not only the display area frame at the start of scrolling and the end of scrolling but also the display area frame at the start of scrolling to the display area frame at the end of scrolling. Since the trajectory of the area frame is also created and overlaid on the map displayed in a wide area, the user can more clearly know the area on the scrolled map.

  Further, the scroll instruction input by the continuous operation of the input means 10 is sequentially stored in the storage means 13 as scroll history data, and stored according to the automatic scroll instruction input by the operation of the input means 10. Based on the scroll history data sequentially read from the means 13, the map at the start of scrolling is directed toward the map at the end of scrolling (forward direction), or from the map at the end of scrolling toward the map at the start of scrolling (reverse) Since the map is drawn while automatically scrolling (in the direction), the target point was found in the previous scrolling operation, and when searching for the same point again, there is no need to manually perform the scrolling operation again. Can be omitted.

  In addition, the scroll instruction input by the continuous operation of the input means 10 is sequentially stored in the storage means 13 as scroll history data, and the input is performed when the scale of the map to be displayed has been changed from the time of scrolling. Based on the scroll history data sequentially read from the storage means 13 in accordance with the automatic scroll instruction input by the operation of the means 10, from the map at the scroll start to the map at the end of the scroll (forward direction), Or, since the map at the scale was changed while automatically scrolling from the map at the end of scrolling to the map at the start of scrolling (reverse direction), the target point was changed by the previous scrolling operation. The convenience when searching for the same point that has been found again is further improved.

  Further, the map displayed on the display unit 11 at the start of scrolling and at the end of scrolling is based on the scroll history data read from the storage unit 13 in accordance with the automatic scale display instruction input by the operation of the input unit 10. Since it is configured to draw a map whose scale has been changed so as to be fully displayed on the screen of the display means 11, it is possible to display in detail between areas before and after scrolling.

It is a block diagram which shows the structure of the map display apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows operation | movement when scroll operation of a map screen is made | formed in the map display apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows operation | movement when the operation of a scroll history list | wrist is made | formed in the map display apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows operation | movement when the functional operation in FIG. 2 and FIG. 3 was made. It is a flowchart which shows the detail of the scale change process shown in FIG. It is a flowchart which shows the detail of the automatic scale display process shown in FIG. 5 is a flowchart showing details of scroll reproduction processing shown in FIG. 4. It is a figure which shows the example of the function switch displayed on a map screen in the map display apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the example of the map displayed when a scale change is instruct | indicated in the map display apparatus which concerns on Embodiment 1 of this invention, and a display area frame. It is a figure which shows the example of the map and display area frame which are displayed when automatic scale display is instruct | indicated in the map display apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the log | history list menu of the scroll operation used in the map display apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the example of the map displayed when scroll reproduction is instruct | indicated in the map display apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the mode selection menu of the display area frame used in the map display apparatus which concerns on Embodiment 1 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Input means, 11 Display means, 12 Map information acquisition means, 13 Storage means, 14 Display control means, 20 Display center calculation means, 21 Display scale calculation means, 22 Area frame calculation means, 23 Menu control means, 24 Map drawing control means.

Claims (7)

Map information acquisition means for acquiring map information;
Display means for displaying a map;
Input means for inputting instructions by operation;
Storage means for storing a scroll instruction input by operating the input means as scroll history data;
In response to an instruction to change the scale of the wide area display to a predetermined scale input by the operation of the input means, a map of a predetermined scale is drawn , and scrolling is started based on the scroll history data read from the storage means A display area frame representing the display area frame at the time and the range of the map displayed on the display means at the end of scrolling, and centering on the display position input by the operation of the input means, Display device comprising: a display control means for drawing on a map of a different scale . The storage means sequentially stores the scroll instruction input by continuous operation of the input means as scroll history data,
Display control means, in response to the wide-angle display scale change instruction to predetermined scale input by the operation of said input means, as well as draw a map of predetermined scale sequentially reads scroll history data from said storage means On the basis of the display area frame at the start of scrolling, the display area frame at the end of scrolling and the display area frame from the display area frame at the start of scrolling to the display area frame at the end of scrolling . 2. The map display device according to claim 1, wherein the map display device draws both the frame and the trajectory on the map of the predetermined scale with the display position input by the operation as a center . The storage means sequentially stores the scroll instruction input by continuous operation of the input means as scroll history data,
The display control means is directed from the map at the start of scrolling to the map at the end of scrolling based on the scroll history data sequentially read from the storage means in response to the automatic scrolling instruction input by operating the input means. 2. The map display device according to claim 1, wherein the map is drawn while automatically scrolling from the map at the end of scrolling toward the map at the start of scrolling.   When the scale of the map to be displayed has been changed from the time of scrolling, the display control means is based on the scroll history data sequentially read from the storage means in accordance with the automatic scroll instruction input by the operation of the input means. It draws a map whose scale has been changed while automatically scrolling from the map at the start of scrolling to the map at the end of scrolling or from the map at the end of scrolling to the map at the start of scrolling The map display device according to claim 3. The display control means sets the display area frame at the start of scrolling and the display area frame at the end of scrolling based on the scroll history data read from the storage means in response to the automatic scale display instruction input by operating the input means. a map display device according to claim 1, wherein the both include the map is drawn by changing the scale to be displayed on the full screen of the display unit. The storage means sequentially stores the scroll instruction input by continuous operation of the input means as scroll history data,
The display control means includes a display area frame at the start of scrolling and a display area frame at the end of scrolling based on the scroll history data read from the storage means in response to an instruction for automatic scale display input by operating the input means. And the map including the trace of the display area frame from the display area frame at the start of scrolling to the display area frame at the end of scrolling is drawn at a reduced scale so that it is fully displayed on the screen of the display means. The map display device according to claim 1. The storage means stores a plurality of scroll history data,
The input means selects one scroll history data to be used for processing from among a plurality of scroll history data stored in the storage means. The map display device described in the item.

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