JPH07320079A - Method and device for partial enlargement display of figure - Google Patents

Abstract

PURPOSE:To eliminate mutual influence of partial enlargement of plural places by partially enlarging optional places of the figure without varying the size of a display area and setting conversion areas without any mutual overlap. CONSTITUTION:A conversion area setting part 20 sets the conversion area by referring to a conversion parameter inputted from a conversion parameter input part 50. A setting part 20 performs a drawing process while sequentially increasing the size of a square around the focus specified with the conversion parameter. Consequently, the enlargement is performed until the respective sides of the square overlap with the limit value of the display area of the figure determined by the sides of other squares or the conversion parameter. When the side overlaps with the limit value, the enlargement is ended and the conversion area is set. If a blank area which does not to any area in the display area is formed, the blank area, i.e., the short sides of a rectangle are divided to set the conversion area so that no overlap is generated as to all focuses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for partially enlarging a graphic and a device for enlarging a graphic, and more particularly, to make it easy to see a crowded area such as a map while keeping the size of the display area constant. The present invention relates to a method for partially enlarging a graphic and a device for partially enlarging a graphic for enlarging a specific part in order to display only a specific part in detail on the same map.

More specifically, the present invention relates to a partial enlarged display method of a graphic and a partial enlarged display apparatus of a graphic for displaying a plurality of arbitrary positions of a graphic such as a map in an arbitrary size on the basis of designation by an operator.

[0003]

2. Description of the Related Art As a conventional method for partially enlarging a graphic,
For example, the document “Graphical Fisheye Views of Graphs (M
anojit Sarkar & Marc H. Brown, In Proc. ACM SIGCHI
'92 Conf. On Human Factors in Computing Systems, 1
992), the fisheye deformation constant d,
When setting the enlargement area using the display limit coordinate value E of the screen, the enlargement center coordinate, that is, the focus coordinate value P and the original coordinate value N, {d + 1 / d + (E−P / N−P)} It is calculated by (E−P) + P. That is, as shown in FIG. 10A, an arbitrary point P on the square lattice is defined as a focus, and the fisheye deformation constant d is set, whereby the deformation is performed as shown in FIG. 10B. .

As described above, in the fisheye coordinate conversion method, the portion closer to the focus is enlarged at a larger enlargement ratio, and the portion further away from the focus by a certain distance is reduced and displayed in reverse, so-called fisheye display. It is possible to do. Further, by setting the value of the fisheye deformation constant d appropriately, a desired enlargement ratio can be obtained.

In the above fisheye coordinate conversion method, only one point is defined as the focus. However, as a method for enlarging a plurality of arbitrary points, for example, a method such as fisheye coordinate conversion is separately performed for each of a plurality of focuses. After calculating the transformed coordinate value using, the average coordinate value is calculated as the final transformed coordinate value.

[0006]

However, in the above-mentioned conventional fisheye coordinate conversion method, since the focus for enlarging is limited to one point, it is impossible to enlarge a plurality of arbitrary positions. Near Tokyo on the map,
There is a problem that it cannot be applied when it is desired to expand two locations near Osaka. In addition, there may be a case where a portion that is not suitable for reduction due to enlargement of a certain portion is reduced.

Further, in the above-described conventional method of enlarging a plurality of arbitrary portions, since a plurality of focus influences each other, it is not possible to predict how much the place where the focus is set is enlarged. Not only it is necessary to set the parameters by trial and error while looking at the results, but, for example, there is a problem that the desired enlargement ratio may not be obtained near Osaka because the enlargement ratio near Tokyo on the map is large. There is.

The present invention has been made in view of the above problems, and solves the problems of the prior art, and the mutual influence of partial enlargement at a plurality of locations without changing the size of the display area for displaying a graphic. It is an object of the present invention to provide a partially enlarged display method of a graphic and a partially enlarged display device of a graphic in which an enlarged area can be set so as to eliminate the above.

Further, an object of the present invention is to expand all areas, and when a blank area which does not belong to any area occurs when the area overlaps with the limit value of the display area by expanding the area, all the focus of the blank area is performed. Is to provide a partially enlarged display method of a graphic and a partially enlarged display device of a graphic that can be divided so as not to overlap each other.

A further object of the present invention is to provide a method for partially enlarging a graphic and a device for partially enlarging a graphic in which an enlarged area can be set in accordance with an enlargement ratio designated in advance by an operator. .

[0011]

According to the partially enlarged display method for a graphic of the present invention, the graphic data is displayed when the graphic data to be displayed is input and the area for coordinate conversion of the graphic data is set. When enlarging arbitrary multiple points of the figure without changing the size of the display area of, based on the center point of each specified enlarging area,
Determine the conversion area of figure data so that all coordinate values do not overlap each other and belong to any area,
The conversion coordinate value is determined for each conversion area.

FIG. 1 is a diagram for explaining the principle of the present invention.

According to the above-described partially enlarged display method of a figure, when setting an area for converting figure data, a square in which the length of one side is predetermined with the center point of a plurality of designated enlargement areas as the center. Is drawn (step 1), and each side of the square is sequentially enlarged to a predetermined length and drawn (step 2), so that each side of the square is a side of another square or a display for displaying a figure. A value obtained by dividing the overlapping distance of the two sides of the square in the enlargement direction when overlapping with the limit value of the area (step 3) into a predetermined ratio, or the limit value of the display area of the figure is set as the boundary area (step 4). If a blank area that does not belong to any of the areas occurs (step 5), a value obtained by dividing the short side of the blank area into a predetermined ratio is determined as the boundary area (step 6).

Further, the size of the square for setting the conversion area is set for each area according to a predetermined enlargement ratio of the portion to be enlarged.

FIG. 2 is a block diagram showing the principle of the present invention.

The partially enlarged graphic display device of the present invention is a graphic storage means 10 for storing graphic data, a conversion parameter input means 50 for inputting parameters for conversion, and a parameter input from the conversion parameter input means 50. Based on the above, by drawing while expanding the size of the square with the center point of the specified multiple expansion areas as the center, each side of the square can be the side of another square or the display area of the figure. Regarding the graphic data conversion area setting means 20 for setting the conversion area based on the overlap with the limit value and setting the conversion areas for all the center points without overlapping with each other, and the coordinate value of the graphic read from the graphic storage means 10,
Based on the parameters input from the conversion parameter input means, the conversion means 30 for performing coordinate conversion for each of the plurality of conversion areas set by the graphic data conversion area setting means 20, and the graphic data coordinate-converted by the conversion means 30. Converted figure storing means 40 for storing, and control means 30 for controlling display of data stored in the converted figure storing means 40.
And display means 70 for displaying the graphic data stored in the converted graphic storage means 40 under the control of the control means 30.

When a blank area which does not belong to any area is generated, the figure conversion area setting means 20 sets the conversion area by dividing the blank area, that is, the short side of the rectangle.

Further, the graphic data conversion area setting means 20 sets each conversion area in accordance with a predetermined enlargement ratio of a portion to be enlarged in size of a square for setting the conversion area.

[0019]

According to the present invention, it is possible to partially enlarge a plurality of arbitrary parts of a graphic without changing the size of the display area for displaying the graphic, and the conversion areas are set so as not to overlap each other. By doing so, it is possible to eliminate the mutual influences of partial enlargement at multiple locations by determining that the sides of the expanding square overlap the sides of other squares and the limit value of the display area. Is.

Further, according to the present invention, by setting the size of the conversion area in accordance with the enlargement ratio of the portion to be enlarged, a large conversion area can be assigned to a portion desired to be enlarged, which is impossible. To expand the area without.

[0021]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 3 shows the structure of a partially enlarged display device according to an embodiment of the present invention. In the figure, the same components as those in FIG. 1 are designated by the same reference numerals. The partially enlarged display device shown in the figure includes a graphic storage unit 10 for storing graphic data and a conversion parameter input unit 5 for inputting parameters for graphic conversion.
0, a graphic conversion area setting unit 20 for setting an area for graphic conversion, and within the area set by the graphic conversion area setting unit 20, the graphic data is converted based on the parameter from the conversion parameter input unit 50. The graphic data conversion unit 30, the converted graphic data storage unit 40 that stores the graphic converted by the graphic data conversion unit 30, the control unit 60 that processes the data for input display, and the converted graphic data storage by the control of the control unit 60. It is composed of a display 70 for displaying the graphic data of the section 40.

The conversion parameter input unit 50 uses a plurality of enlargement center points (focus) for designating enlargement positions as conversion parameters, a fisheye coordinate conversion method, and a method of assigning coordinate values at equal intervals to the method. In this case, the fisheye deformation constant, the fisheye coordinate conversion for each focus and the switching coordinate value for switching the equidistant coordinates, the graphic display limit value for designating the maximum display area when the graphic is displayed on the display 70, etc. are input. .

The conversion area setting unit 20 refers to the conversion parameter input from the conversion parameter input unit 50 and sets the conversion area. The conversion area setting unit 20 draws while sequentially enlarging the size of the square centered on the focus designated by the conversion parameter, so that each side of the square is determined by the side of another square or the conversion parameter. Enlarge it until the limit value of the display area of the figure and the side of the square overlap. When the overlap with the limit value occurs, the enlargement is ended and the conversion area is set. Here, if a blank area that does not belong to any of the display areas occurs, the blank area, that is, the short side of the rectangle is divided so that all the focuses do not overlap with each other. Set the area.

The graphic data conversion unit 30 performs coordinate conversion of the graphic read from the graphic data storage unit 10 for each of a plurality of conversion areas based on the parameters input from the conversion parameter input unit 50, and the coordinate converted graphic data. Is stored in the converted graphic data storage unit 40. The control unit 60 controls the graphic data in the converted graphic data storage unit 40 to be displayed on the display 70.

The coordinate conversion method used by the graphic data conversion section 30 is the fisheye coordinate conversion method used in the conventional technique, or within a certain distance from the focus.
With the fisheye coordinate conversion method, it is possible to use a method in which coordinate values are assigned at equal intervals in a portion apart from the focus by a certain distance or the like, but not limited to these methods.

FIG. 4 is a flow chart of the operation of the conversion area setting unit according to the embodiment of the present invention.

First, the conversion parameter designated by the operator for the coordinate conversion is read from the conversion parameter input section 50 (step 101). Next, the graphic data as the original data to be converted is read from the graphic data storage unit 10 (step 102). Here, as the conversion parameter, a plurality of enlargement center points, that is, the focus, for designating the enlargement position are selected. When using the fisheye coordinate conversion method as the focus or the fisheye coordinate conversion method and the method of assigning coordinate values at equal intervals together, the fisheye transformation constant, the fisheye coordinate conversion for each focus, and the equal interval coordinate conversion are performed. There are switching coordinate values for switching, graphic display limit values that specify the maximum display area when a graphic is displayed on the display, and the like.

Next, one of the focus designated from the conversion parameters read in step 101 is selected one by one in accordance with a predetermined rule such as the order designated by the operator or the order having the smallest coordinate value. (Step 1
03).

Next, the drawing conditions for the square are set. The length of one side of the square is determined using a table that defines the relationship with the deformation constant d, or the magnification ratio at a certain distance is calculated from the focus obtained from the value of d, and the conversion area is proportional to this. By setting, since a large conversion area is assigned to a portion desired to be enlarged, the area can be enlarged without difficulty (step 104). It should be noted that Q is a coordinate that is apart from the focus P by a certain distance, and
When the coordinate value after the fish-eye coordinate conversion is set to R, the enlargement ratio is calculated by RP / QP.

After setting the drawing conditions for such a square, a square is drawn around the selected focus (step 105). The above work is performed for all the focus (step 106).

After the squares have been drawn for all the focuses, is there a side overlap (step 107)?
Alternatively, it is checked whether the figures overlap each other (step 108). If there is no overlap, the length of one side of the square is drawn according to a predetermined rule of the table showing the relationship with the deformation constant d, or the square is enlarged so as to be proportional to the enlargement ratio obtained from the deformation constant d. To do. Here, in step 108, if the square overlaps the display limit value of the figure, the display limit value of the figure is calculated by setting the boundary area value in the corresponding focus direction and set (step 109). After that, the check of the overlap due to the enlargement of the square is stopped in the corresponding direction.
On the other hand, when the square does not overlap the display limit value of the figure, the display limit value is set to the boundary area value (step 1
10) It is checked whether or not all sides overlap (step 111). In step 111, when there is no overlap on the sides of all the squares, the process proceeds to step 103 and is repeated until the overlap occurs on the sides of all the squares drawn for all the focus (step 11).
1).

When the sides of all the squares are overlapped by repeating the above work, the determination of the boundary area by the enlargement of the squares is finished, and the generation of a blank area which does not belong to any focus area is checked. (Step 112). Here, when there is no blank area, the boundary area value is written in the memory in the conversion area setting unit 20 (step 114) and is sent to the graphic data conversion unit 30, and the process is performed by the conversion area setting unit 20. finish.

On the other hand, if there is a blank area, the boundary area value is recalculated (step 113) and step 103
Move to.

Next, in step 108 of the flow chart of the operation of the conversion area setting unit 20 described above, setting of a boundary area when squares overlap each other will be described.

FIG. 5 shows an example of setting a boundary area when squares overlap each other according to an embodiment of the present invention. In the same figure, when a square on one side A whose focus is P1 and a square on one side B whose focus is P2 are overlapped on the sides C and D, the overlapping length E is set to the length of the sides A and B. It is divided into a and b according to the ratio, and L is set as a boundary line. However, the dividing method is not limited to this example, and intermediate coordinates may be simply used, or the ratio may be set in advance based on another rule.

With respect to the direction in which the sides C and D in which the squares overlap each other are enlarged, the check of the overlap due to the enlargement of the squares is stopped thereafter. That is, as shown in FIG. 6, after the overlap occurs, the length L of the boundary area is automatically expanded in accordance with the expansion of the sides of the square. The above operation is repeated until all sides of the squares drawn for all the focus overlaps.

When overlap occurs on all sides of the square by repeating the above work, the determination of the boundary area by the enlargement of the square is completed, and a blank area that does not belong to any focus area is generated. Check. If a blank area has occurred, the blank area is eliminated by the following method.

FIG. 7 is a diagram for explaining a method for eliminating a blank area according to an embodiment of the present invention. In the figure, the above-mentioned work is performed for four focus points P1, P2, P3 and P4, and a blank area K that does not belong to any focus area is generated. In this embodiment, the values of d are the same for all the focus, that is, squares of the same size are drawn. Since the blank area occurs as a rectangle in any case, the blank area K
The lengths of the sides G, F, and G are compared, and the shorter side G is divided into predetermined ratios as shown in FIG. Here, the predetermined ratio is L1, L
A ratio of two lengths may be used, or it may be simply bisected. Further, the present invention is not limited to these, and various settings can be made in design. As a result, the focus P
The conversion areas for 1, P2, P3 and P4 are S
1, S2, S3, S4. These values are registered as boundary area values in the conversion area setting unit 20 and are also passed to the figure data conversion unit 30.

The graphic data conversion unit 30 performs coordinate conversion for each of a plurality of conversion regions based on the coordinate values of the graphic read from the graphic data storage unit 10 based on the conversion parameters input from the conversion parameter input unit 50. The converted graphic data is stored in the converted graphic data storage unit 40, and the converted graphic data is passed to the control unit 60. The control unit 60 performs data processing for input display and controls to display on the display 70.

FIG. 9 shows an application example of an embodiment of the present invention. In the figure, the partial enlargement display device uses the parameters designated by the conversion parameter input unit 50 on the square lattice shown in FIG. 10 to focus P1, P2, P3, P.
4 shows the result obtained by setting 4 and setting the conversion area for each focus and applying the fisheye coordinate conversion method to perform the deformation.

As can be seen from the figure, the conversion areas can be set without overlapping each other with respect to the focus at a plurality of arbitrary positions of the figure.

In FIG. 9, when the area of focus P3 is to display a map of the suburbs of Tokyo and the focus P2 is to display a map of the suburbs of Osaka, the conversion areas of each focus have no influence on each other. Absent. This avoids inconveniences such as the fact that the enlargement ratio in the suburbs of Tokyo is large and the enlargement ratio in the suburbs of Osaka is not the same as that of the map in the suburbs of Tokyo as in the past. When it is desired to display a map in the suburbs of Tokyo and a map in the suburbs of Osaka at the same enlargement ratio, it is possible to display an enlargement region of a desired size by designating a predetermined enlargement ratio.

[0044]

As described above, according to the present invention, it is possible to partially enlarge a plurality of arbitrary positions of a graphic without changing the size of the display area for displaying the graphic.
Since the conversion areas can be set so that they do not overlap with each other, it is possible to eliminate the effects of each other when partially expanding multiple locations that would occur if the conversion areas were not set.
Since a large conversion area is assigned to a portion to be further enlarged by setting a desired enlargement ratio, the area can be enlarged without difficulty and the distortion can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram for explaining the principle of the present invention.

FIG. 2 is a principle configuration diagram of the present invention.

FIG. 3 is a configuration diagram of a partially enlarged display device according to an actual example of the present invention.

FIG. 4 is a flowchart showing an operation of a conversion area setting unit according to an embodiment of the present invention.

FIG. 5 is a diagram showing an example of setting a boundary area when squares overlap each other according to an embodiment of the present invention.

FIG. 6 is a diagram for explaining a method of automatically enlarging a boundary area line defined when squares overlap each other according to an embodiment of the present invention.

FIG. 7 is a diagram (No. 1) for explaining a method for eliminating a blank area according to an embodiment of the present invention.

FIG. 8 is a diagram (No. 2) for explaining the method for eliminating the blank area according to the embodiment of the present invention.

FIG. 9 is a diagram showing an application example of an embodiment of the present invention.

FIG. 10 is a diagram for explaining alteration of a figure by a conventional fisheye coordinate conversion method.

[Explanation of symbols]

 10 graphic storage means, graphic data storage section 20 conversion area setting means, conversion area setting section 30 conversion means, graphic data conversion section 40 converted graphic storage section, converted graphic data storage section 50 conversion parameter input means, conversion parameter input section 60 control Means, control unit 70 Display means, display

Claims (6)

[Claims] 1. Graphic data for display is input,
When setting an area for coordinate conversion of the graphic data, when enlarging an arbitrary plurality of positions of the graphic without changing the size of the display area for displaying the graphic data,
Based on the center point of each designated expansion area, the conversion area of the graphic data is determined so that all the coordinate values do not overlap each other and all the coordinate values belong to one of the areas, and the conversion coordinate value for each conversion area is determined. A partially enlarged display method of a figure, characterized by determining. 2. When setting an area for converting graphic data, a square having a predetermined length of one side is drawn around the center point of a plurality of designated enlargement areas, and each side of the square is drawn. By sequentially enlarging and drawing to a predetermined length, the two sides of the square expand when each side of the square overlaps the side of another square or the limit value of the display area for displaying a figure. A value obtained by dividing the overlapping distance of by a predetermined ratio,
Alternatively, when the limit value of the display area of the figure is set as the boundary area and a blank area that does not belong to any area occurs, a value obtained by dividing the short side of the blank area into a predetermined ratio is determined as the boundary area. The partially enlarged display method of the graphic according to claim 1. 3. A partially enlarged display of a graphic according to claim 2, wherein the size of the square for setting the conversion region is set for each region according to a predetermined enlargement ratio of the portion to be enlarged. Method. 4. A graphic storage means for storing at least graphic data, a conversion parameter input means for inputting parameters for conversion, and a plurality of enlargements designated based on the parameters input from the conversion parameter input means. By drawing while sequentially enlarging the size of the square with the center point of the area as the center, each side of the square is converted into a conversion area based on the sides of other squares or the limit value of the display area of the figure. Regarding the graphic data conversion area setting means for setting and setting the conversion area without overlapping with each other for all the center points, and the coordinate values of the graphic read from the graphic storing means,
Conversion means for performing coordinate conversion for each of a plurality of conversion areas set by the graphic data conversion area setting means based on the parameters input from the conversion parameter input means; and graphic data coordinate-converted by the conversion means. Converted figure storage means for storing, control means for controlling display of data stored in the converted figure storage means, and display of graphic data stored in the converted figure storage means under the control of the control means A partially enlarged display device for a graphic, comprising a display means. 5. The graphic data conversion area setting means, when a blank area that does not belong to any area is generated,
By dividing the blank area, that is, the short side of the rectangle,
The partially enlarged display device for a graphic according to claim 4, wherein a conversion area is set. 6. The graphic according to claim 4, wherein the graphic data conversion area setting means sets each conversion area in accordance with a predetermined enlargement ratio of a portion for which the size of the square for setting the conversion area is to be enlarged. Enlarged display device.