JP3602899B2 - Graphic data display device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a graphic data display device for selecting a partial range of a graphic database such as a road map mapping system and displaying the selected range on a display.
[0002]
[Prior art]
Generally, in a graphic database such as a road map mapping system, a predetermined area needs to be enlarged and displayed on a display or the like for the purpose of examining details or correcting graphic data.
[0003]
To enlarge a predetermined area, first, figure data is called up for each predetermined rectangular mesh area (basic area) and displayed on the display screen, and the user specifies an arbitrary area in the display screen. The graphic data in the specified range is enlarged to display necessary detailed graphic data on the display screen.
[0004]
Regarding a method of enlarging a rectangular range having the same horizontal axis as the horizontal direction of the mesh and displaying it on a display screen, and displaying a once-specified rectangular range, the present applicant has disclosed a "display screen switching device (Japanese Patent Laid-Open No. 7-200789). ) "Has been filed.
[0005]
[Problems to be solved by the invention]
However, a rectangular range having an arbitrary inclination with respect to the horizontal direction of the mesh is specified and displayed, and when the display range is changed, the range specified in the previous stage is stored and displayed again. Could not. Therefore, when trying to display the same range, the operator must specify the range again by referring to drawings and memories previously issued, which places a heavy burden on the operator and increases the range. There was a problem that the reproduction was inaccurate.
[0006]
The present invention has been made in view of such a problem, and an object of the present invention is to specify an arbitrary rectangular range having an arbitrary inclination by a simple method, and to obtain a parameter necessary for displaying the rectangular range. Is stored in a storage device, and a once designated range can be easily called at any time thereafter.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides first developing means for extracting graphic data within a basic range from a graphic database holding graphic data and developing the graphic data into a first work file; First display means for displaying on a screen, designating means for designating a rectangular first range in an arbitrary direction in the graphic data displayed by the first display means, and the first work file And a second display means for extracting the graphic data in the first range from the data and developing the graphic data in a second work file, and a second display means for displaying based on the data developed in the second work file. The designation means designates a starting point and an ending point in the graphic data displayed by the first display means, and sets a basic line connecting the starting point and the ending point to water in the first range. A display device for graphic data, characterized in that the direction of the center line.
Here, the second developing means extracts graphic data in a rectangular second range circumscribing the first range and surrounded by sides parallel to each side of the basic range, and extracting the figure data with the basic line. Graphic data is obtained in a coordinate system rotated by an angle formed by the base of the basic range, and is expanded to a second work file.
Further, the second display means displays the graphic data in the first range by moving the graphic data in a direction perpendicular to the basic line.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an example of a device configuration of a display screen selection device 1 used in an embodiment of the present invention. In FIG. 1, 2 is a host computer, 3 is an internal storage device, 4 is a map database, 5 is an application program, 7 is a work area, 9 is a display, 11 is a digitizer (or tablet or the like), 13a is a stylus pen, a cursor, etc. Reference numeral 13b denotes a pointing device such as a mouse, 15 denotes a keyboard used for data input, command input, movement of a display cursor on the display 9, and the like, and 17 denotes a printer (inkjet printer, laser printer, electrostatic plotter, or the like). In the work area 7, a first work file 21, a second work file 23, and the like are prepared.
[0009]
The host computer 2 performs various processes according to the application program 5 stored in an external storage device or the like. The contents of the map database 4 are displayed on the display 9 by the operation of the operator. When the pointer 13b is moved, the cursor moves on the display 9 as the pointer 13b is moved. By clicking the pointer 13b, a point or a line segment of the map on the display 9 is designated, a displayed menu or the like is displayed. The next work content can be selected from. In addition, the operator can select the work content by clicking the pointing tool 13a on a menu sheet or the like affixed on the digitizer 11.
[0010]
The map database 4 stored in the external storage device is configured as a separate layer for each type of data such as road data, building data, and gas pipe data, and is provided with a search layer number. The map database 4 is composed of a set of meshes separated by a rectangular range having a predetermined size. Each mesh is assigned a mesh number for search.
[0011]
The operator can use the application program 5 to store data necessary for work in a work area 7 provided in the internal storage device 3 or the like. The work area 7 is provided with a first work file 21, a second work file 23, and the like. The data storage table 101 (FIG. 10) for recalling the graphic in the range specified by the operator is temporarily stored in the internal storage device 3, but is stored in the external storage device for long-term storage.
[0012]
FIG. 2 shows a mesh range ("basic range" in the claims) 41, a first window (first specified range) 43, a second window (second specified range) 44, and a third window (third window) in the present embodiment. FIG. FIG. 2 shows a state in which a layer of road data in a mesh range 41 selected on the entire display 9 is selected and displayed.
[0013]
In the present embodiment, a case will be described in which the aspect ratio a of the mesh is the same as the aspect ratio of the display 9 and the data of the entire mesh enters the entire display 9. Further, within the mesh range 41 displayed on the display 9, the first window 43 is designated to change the display content of the display 9, and then the second window 44 and the third window 45 are designated.
[0014]
The coordinates of the four corner points constituting the mesh range 41 displayed on the display 9 are stored in the map database 4 as absolute coordinates. Assuming that the length of the mesh range 41 in the X-axis direction is L and the aspect ratio is a, the length in the Y-axis direction is aL. Assuming that the coordinates of the point A1 at the lower left origin are A1 (XA, YA), the coordinates of the remaining three corners are B1 (XA + L, YA), C1 (XA, YA + aL), and D1 (XA + L, YA + aL), respectively. is there. The mesh surrounded by the coordinates of these four points becomes a rectangle in the case of rectangular coordinates and is displayed in accordance with the four sides of the display area of the display 9.
[0015]
FIG. 3 and FIG. 4 are flowcharts illustrating the functions of the display screen selection device 1. First, the operator causes the display 9 to display contents as shown in an example of the basic selection menu in FIG. Next, the target layer number is specified from the map database 4 using the pointing tool 13b or the like, and the mesh range 41 is specified (step 301). The mesh range 41 is selected by designating a mesh number or an address. In the present embodiment, the layer number designates a layer number constituting road map data.
[0016]
Next, map data for the specified mesh and layer is extracted from the map database 4 and stored in the first work file 21 (step 302). The host computer 2 displays the map data stored in the first work file 21 on a screen (Step 303). At this stage, the operator determines whether or not to end the operation (step 304). If the operation is not terminated in step 304, an arbitrary range in the display 9 can be designated and enlarged.
[0017]
FIG. 6 is a diagram showing the start point 51 and the end point 53. The operator designates, for example, a current point such as a target road as a starting point 51 and an intermediate destination as an end point 53 with the pointing device 13b or the like (step 305). As will be described later, if the line connecting the starting point 51 and the ending point 53 is the horizontal center line 57 of the range to be displayed, the rectangle whose aspect ratio can be displayed on the display 9 from the aspect ratio a of the display 9 is Is a range surrounded by four points S, T, Q, and R.
[0018]
The host computer 2 calculates the magnitude and angle θ of the basic vector 55 from the start point 51 to the end point 53 (Step 306). Assuming that the coordinates of the start point 51 and the end point 53 are (x1, y1) and (x2, y2), the angle θ is calculated by the following equation.
θ = tan-1 [(y2-y1) / (x2-x1)]
[0019]
Next, a line connecting the start point 51 and the end point 53 is set as a horizontal center line 57, and a first maximum range (first range in claims) 59 is calculated (step 307). The coordinates of both ends S and T of the bottom of the first maximum range 59 are (XS, YS) and (XT, YT), and the coordinates of both ends Q and R of the top are (XQ, YQ) and (XR, YR). . At this time, assuming that the coordinates of the starting point 51 are (XO, YO) and the coordinates of the ending point 53 are (XP, YP), the coordinates S (XS, YS) and T (XT, YT) at both ends of the base are represented by the following equations. Is obtained as the solution of
[0020]
That is,
XS = a (YT-YS) / 2 + X0
YS = a (XT-XS) / 2 + Y0
XT = a (YT-YS) / 2 + XP
YT = a (XT-XS) / 2 + YP
[0021]
FIG. 7 is a diagram showing a circumscribed rectangle (second range of claims) 61. From the first work file 21, a range of a circumscribed rectangle 61 circumscribing the first maximum range 59 and surrounded by sides parallel to each side of the mesh range 41 is obtained. The graphic data in the circumscribed rectangle 61 surrounded by the four corner points A2, B2, C2, and D2 is extracted and developed in the second work file 23 (step 308). Assuming that the coordinates of the lower left point A2 are (Xmin, Ymin) and the coordinates of the upper right point D2 are (Xmax, Ymax), Xmin is the minimum value of XQ, XR, XS, XT, and Xmax is XQ, XR, XS, The maximum value of XT, Ymin, is the minimum value of YQ, YR, YS, YT, and Ymax is the maximum value of YQ, YR, YS, YT.
[0022]
FIG. 8 is a diagram showing rotations of the X axis and the Y axis. The X axis and the Y axis are each rotated by an angle θ. The rotated X axis is the XX axis, the rotated Y axis is the YY axis, and the coordinates of the graphic data in the circumscribed rectangle 61 in the coordinate system composed of the XX axis and the YY axis are obtained. That is, the data of the second work file 23 is rotated around the lower left point A1 of the mesh of the first work file 21 so that the mesh base 71 connecting A1 and B1 is parallel to the basic vector 55. Then, the rotated data is replaced with the original data of the second work file 23 (step 309).
[0023]
Assuming that the coordinates after rotation of the general coordinates (X, Y) before rotation are (X1, Y1), X1 and Y1 are respectively obtained by the following equations.
X1 = (X−XA) cos θ + (Y−YA) sin θ + XA
Y1 = − (X−XA) sin θ + (Y−YA) cos θ + YA
[0024]
Therefore, if the coordinates after rotation of the point S (XS, YS) and the point T (XT, YT), which are the two bottom points of the first maximum range 59, are (XS1, YS1) and (XT1, YT1), XS1, YS1, XT1, and YT1 are respectively obtained by the following equations.
XS1 = (XS−XA) cos θ + (YS−YA) sin θ + XA
YS1 = − (XS−XA) sin θ + (YS−YA) cos θ + YA
XT1 = (XT-XA) cos θ + (YT-YA) sin θ + XA
YT1 = − (XT−XA) sin θ + (YT−YA) cos θ + YA
[0025]
Next, among the rotated data in the second work file 23, the graphic data in the first maximum range 59 surrounded by the four points S, T, Q, and R is displayed on the display 9. The displayed graphic data can be easily translated in a direction perpendicular to the basic vector 55 in the screen of the display 9 (step 310).
[0026]
FIG. 9 is a diagram illustrating the first window 43. Only a necessary portion within the first maximum range 59 displayed on the display 9 is surrounded by a first window 43 including four points E, F, G, and H. At this time, the operator may designate only the lower left one point E out of the four points with the pointing device 13b or the like. Here, for example, it is assumed that the point E is designated as the intersection of the X axis and the line segment SQ.
[0027]
At this time, assuming that the coordinates of the point E are (X1E, Y1E) and the coordinates of an arbitrary point before the movement are (X1, Y1), the coordinates (X2, Y2) after the parallel movement are expressed by the following equation.
X2 = X1 + X1E
Y2 = Y1 + Y1E
[0028]
The vector of the lower end line connecting the points E and F is the same as the basic vector. Further, the position of the upper end line is automatically set to a position symmetrical to the lower end line with respect to the horizontal center line 57. The host computer 2 displays the graphic data in the range surrounded by the first window 43 on the display 9 (Step 311).
[0029]
Next, the operator determines whether or not to save data for determining the window range (step 312). FIG. 10 is a diagram showing the data storage table 101. For example, if the user selects to save the data that determines the range of the first window 43, the coordinate value data of the starting point 51 and the ending point 53 of the basic vector 55 corresponding to the lower end line EF of the first window 43 Then, the display window parameter 103 and the saved work file number 105 are stored in the storage device (step 313).
[0030]
Here, the display window parameter 103 is the aspect ratio b of the first window 43 calculated. The saved work file number 105 of the first window 43 is W2 in FIG. Note that W1 is a save work file number 105 when the entire mesh range 41 is saved as a window.
[0031]
If it is determined in step 312 not to save the window range, and if step 313 is completed, the operator determines whether or not to specify another window range (step 314). If another window is not specified, the process returns to step 304.
[0032]
When another window is designated, it is determined whether or not to designate a window that does not change the angle θ of the basic vector (step 315). When a window having the same basic vector angle θ is designated, the positions of the four corner points that constitute the window in a rectangular shape are designated and displayed (step 316).
[0033]
FIG. 11 is a diagram illustrating a plurality of windows shown in FIG. For example, in the second window 44 which has the same lower end line as the first window 43 and differs only in the position of the upper end line, the starting point and the ending point of the vector are the same as the first window 43. In the second window 44, a display window parameter (aspect ratio) 103 is different from that in the first window 43.
[0034]
In step 315, when it is desired to specify a window in which the angle θ of the basic vector is different from that of the first window 43, as in the third window 45 of FIG. 11, the process returns to step 305 to newly specify a range. For example, if the display has the same aspect ratio a as the display 9 and both ends of the lower line are I and J, the range can be designated by the fourth data of the number of display times in the table of FIG. .
[0035]
When the window is called later, the frame lines of each range included in the data storage table 101 are displayed on the display 9 on which the mesh range 41 is displayed in different colors, and one of the frame lines is indicated by the indicator 13b. Thus, the corresponding work file number 105 is automatically extracted. The host computer 2 automatically performs steps 307 to 411 in FIGS. 3 and 4 using the data in the data storage table 101, extracts necessary data from the map database 4, processes the data, and displays To be displayed.
[0036]
As described in detail above, according to the present embodiment, an arbitrary rectangular range having an arbitrary inclination is specified by a simple method, parameters necessary for displaying the rectangular range are stored in the storage device, and It is possible to provide the display screen selection device 1 for the map database 4 that can call the designated range at any time.
[0037]
In the present embodiment, the map database 4 includes only graphics, but the graphic data may also include, for example, characters describing a graphic such as a road name. .
[0038]
Further, in the present embodiment, only the layers constituting the road map data are selected from the map database 4 and stored in the first work file 21. However, when a plurality of layers, such as a road and a gas pipe, are simultaneously called and stored separately in the first work file 21 and displayed on the display 9, the layer differs in the graphic data of each layer. It may be superimposed by giving a color.
[0039]
Further, in the present embodiment, when specifying the range, both ends of the horizontal center line are specified as a start point and an end point. , Or both ends of a diagonal line.
[0040]
Further, in the present embodiment, the position of the upper end line of the window is set to a target position with respect to the lower end line with respect to the center line 57 in the horizontal direction. The range of one window 43 may be set.
[0041]
Also, in step 312 of FIG. 3, the operator determines whether or not to save the data for determining the range of the first window 43. However, actually, the data is saved only for the range selected by the operator. It may be a method, a method of saving all data for determining the range every time the position of the upper or lower end of the window is determined, and erasing only unnecessary windows later, or another method.
[0042]
【The invention's effect】
As described above in detail, according to the present invention, an arbitrary rectangular range having an arbitrary inclination is specified by a simple method, and parameters necessary for displaying the rectangular range are stored in a storage device. It is possible to provide a graphic data display device capable of calling a designated area at any time.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a device configuration of a display screen selection device 1 used in an embodiment of the present invention. FIG. 2 is a diagram showing a mesh range 41 and a window. FIG. FIG. 4 is a flowchart illustrating functions of the display screen selection device 1 (continued).
FIG. 5 shows an example of a basic selection menu. FIG. 6 shows a starting point 51 and an ending point 53. FIG. 7 shows a range of a circumscribed rectangle 61 circumscribing a first maximum range 59. FIG. FIG. 9 shows a first window 43; FIG. 10 shows a data storage table 101; FIG. 11 shows a plurality of windows shown in FIG. 10; ]
1 Display screen selecting device 2 Host computer 3 Internal storage device 4 Map database 5 Application program 7 Work area 9 Display 11 Digitizer 13a ... Indicator 13b ... Indicator 15 ... Keyboard 17 ... Printer 21 ... First work file 23 ... Second work file 41 ... Mesh range 43 ... First window 44 Second window 45 Third window 51 Starting point 53 End point 55 Basic vector 57 Horizontal center line 59 First maximum range 61 ... Circumscribed rectangle data 71... Mesh base 101... Data storage table 103... Display window parameter 105...

Claims (7)

First developing means for extracting graphic data within a basic range from a graphic database holding graphic data and developing the graphic data into a first work file;
First display means for displaying the graphic data on a screen;
Designating means for designating a rectangular first range in an arbitrary direction in the graphic data displayed by the first display means;
Second developing means for extracting the graphic data in the first range from the first work file and developing the graphic data into a second work file;
Second display means for displaying based on the data expanded in the second work file;
With
The designating means designates a starting point and an ending point in the graphic data displayed by the first display means, and sets a basic line connecting the starting point and the ending point as a horizontal center line of the first range. A graphic data display device characterized by the following. The second developing means extracts graphic data in a rectangular second range circumscribing the first range and surrounded by sides parallel to each side of the basic range, and extracting the basic line and the basic 2. The graphic data display device according to claim 1, wherein the graphic data is obtained in a coordinate system rotated by an angle formed by the bottom of the range, and is expanded to a second work file. 2. The graphic data display apparatus according to claim 1, wherein the second display means displays the graphic data in the first range by moving the graphic data in a direction perpendicular to the basic line. 2. The graphic data display device according to claim 1, further comprising storage means for storing data for determining a display range displayed by said first display means and said second display means. The said 2nd display means displays the graphic data of the 1st designated range designated inside the said 2nd range. One A display device for the described graphic data. 6. The image processing apparatus according to claim 5, wherein the second display unit has the same lower end line as the first specified range and displays graphic data in a second specified range having an aspect ratio different from that of the first specified range. Display device for graphic data. The second display means displays graphic data in a third specified range having the same aspect ratio as a screen, with a line connecting two newly specified points as a lower end line in the first range. The graphic data display device according to claim 1.

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