JPH04313170A - Graph display device - Google Patents

Abstract

PURPOSE:To display easy-to-see graphs for a user. CONSTITUTION:A scale decision means 9 deciding the scale numerical values from the value of B by extracting the maximum and the minimum values of graph data and deciding the scale value by selecting (n) to obtain 0.75<=B=AX10<n7.5 with an operation of A={(the maximum value-the minimum value)/(value suitable for graph display)}, a scale generation means 10 automatically generating the scale by obtaining the minimum and the maximum scale values from graph data while adding the scale of the scale values from '0', and a graph display means 2 executing the graph display from the graph data, graph display position, and scale, are provided. Thus, the graph display frame can be arbitrarily set, and the scale space can be automatically generated.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a graph display device for displaying graphs such as line graphs and bar graphs on the output section of a computer system having a graphic function, and more particularly, it relates to a graph display device for displaying graphs such as line graphs and bar graphs on the output section of a computer system having a graphic function. It is something.

0002

2. Description of the Related Art The structural concept of a conventional general graph display device is shown in a block diagram in FIG. The graph display device shown in this figure has a display control unit 2 that controls the display of a CRT 1.
A display position setting unit 3 that sets a graph display area on the display screen of T1, a graph data storage unit 4 that stores graph data to be displayed, and a physical size in which logical graph data should be actually displayed. A logical/physical position conversion unit 5 converts the scale into a graph scale, a scale setting unit 6 sets the number of scales, the maximum scale value, and the minimum scale value of the graph scale, {(maximum scale value)−(minimum scale value)}/(number of scales) ) is installed and configured to include a scale determining unit 7 and the like that calculates the size of one scale. In such a configuration, the position information set in the display position setting section 3 is fixed, and the scale determination section 7 calculates the size of one scale based on each value set in the scale setting section 6, and displays the graph. A graph is displayed on the CRT 1 by the display control section 2 according to the graph data in the data storage section 4. FIG. 5 shows the results of displaying a bar graph using the conventional graph display device as described above.

0003

[Problems to be Solved by the Invention] As shown in FIG. 5, in the conventional graph display device, it is necessary to always set the number of graph scales to be displayed in the scale setting section 6, and the scale setting Since the scale size is determined by simple division in section 6 and scale determination section 7, the horizontal axis scale (or vertical axis scale) is 6.3, 7.3, 8.
In some cases, halfway numbers such as 3, 9.3, etc. were set, making the graph difficult to read. Another problem is that the display coordinate position set in the display position setting section 3 is always fixed, and the graph display position on the screen of the CRT 1 cannot be changed.

SUMMARY OF THE INVENTION The present invention aims to solve these problems, and aims to realize a graph display device that can display graphs that are easy for the user to view without being restricted by scale settings.

[0005]

[Means for Solving the Problems] The present invention, which has solved the above problems, provides a graph display device that has a graph display function and displays graph data given from a computer, including the graph data and the graph display position. a storage means for securing the maximum value and a minimum value of the graph data, a graph data extraction means for extracting the maximum value and minimum value of the graph data, and calculation of numerical value A=(said maximum value - said minimum value)/(value suitable for graph display). and 0.75≦{numeric value B=(said numerical value A).
×10n)}<7.5, a numerical value selection means for selecting n (where n is an integer), and a scale determination means for determining a scale value for graph display according to the value of the numerical value B;
When the magnitude of the scale value obtained by the scale determining means is added from 0 and the scale value falls within the range of the minimum value and maximum value of the graph data, the scale values before and after that are set as the minimum scale value and the maximum scale value. a scale generation means for setting a graph scale; and a display control for performing a graph display from the graph data and graph display position in the storage means, scale values and graph scale obtained from the scale determination means and the scale generation means. 1. A graph display device characterized by having a means for displaying a graph.

[0006]

[Operation] The graph display device of the present invention extracts the maximum and minimum values of the graph data from the graph data and the graph display position, and extracts the maximum value and minimum value of the graph data, and extracts the numerical value A = (maximum value - minimum value) / (value suitable for graph display). ), 0.75≦{Number B=(Number A)
×10n)}<7.5 (where n is an integer value), and the scale value of the graph display is determined according to the value of B. Furthermore, the magnitude of this scale value is added from 0, and when it enters the range of the minimum value and maximum value of the graph data, the scale values before and after that are set as the minimum scale value and the maximum scale value, and the graph scale is set, Execute graph display.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a conceptual diagram of the structure of a graph display device embodying the present invention, and the structure of an embodiment of the present invention will be explained using this diagram. In this figure, the CRT 1 and graph data storage section 4 are the same as the conventional one shown in FIG. The graph data storage unit 4 stores graph data 42,
16,...,88 are set. Display position storage section 3'
is a block whose display position can be set arbitrarily by the user, and the lower left coordinate values (xmin, ymin
) and upper right coordinate values (xmax, ymax) are determined. Further, the graph data maximum/minimum detection unit 8 detects the maximum value and minimum value from the graph data in the graph data storage unit 4. The scale generation section 9 generates scale values before, after, and between the maximum and minimum values from the maximum/minimum detection section 8 . The scale display section 10 sends the physical position and numerical value at which the scale should be displayed based on the scale value obtained from the scale generation section 9 as a character string to the display control section 2'. The scale maximum/minimum detection section 11 detects the maximum value and minimum value among the scale values obtained from the scale generation section 9. The graph frame display section 12 has a function of setting a coordinate area of the logical range given from the scale maximum/minimum detection section 11 at the physical display position given from the display position storage section 3'. After this setting, a graph frame is displayed, and the inside of this graph frame becomes a logical coordinate area where the values of the graph data are displayed as they are. The graph display function unit 13 is a graph display application function that draws graphs such as line graphs and bar graphs. Furthermore, the display control unit 2' is a driver that drives the CRT 1, and controls the display position logically (window function).
By specifying either physical (viewport function), display information (circle, line,
Controls the display of figures (such as points, numbers, characters).

Next, the operation of the apparatus of the present invention having such a configuration will be explained using the flowchart of FIG. 2 and actual values.

First, graph data 42, 16, 35, 58, 94, 88 are set in the graph data storage section 4, and the lower left position of the graph (x1, y
1) and the upper right position of the graph (x2, y2).

(1) The graph data maximum/minimum detection unit 8 detects the maximum value MAX94 and the minimum value MI of the graph data.
Detect N16. (2) The scale generator 9 calculates the maximum value MA of the graph data.
From X and the minimum value MIN, execute A=(MAX-MIN)/4 to obtain A=(94-16)/4=19.5. The value "4" used in this division is as follows. In other words, (number of characters that can be physically written on one line of the display screen of CRT1) / (number of digits that the computer can handle +
In reality, (80 characters)/(16 digits + 4 digits) = 4. In this way, the optimum value of the value "4" differs depending on the computer system. (3) Furthermore, an integer n (however, n=-18, -17,...
, 17, 18) and multiply the value A by 10n.
The calculation is stopped when 0.75≦B=A×10n <7.5, and n at this time is determined. B=19.5×1
0-1=1.95 and n=-1. (4) Next, calculate n'=-1×n. here,
n'=-1. (5) Determine the scale value from the value of numerical value B. That is, the numerical value B is B<1.5, 1.5≦B≦3.5, B>3.
5. Find out which range it falls within. In this case, 1
．． Since 5≦B=1.95≦3.5, the process proceeds to step (6), and the scale value B'=2×10n' is determined. Here, B'=2×10n'=2×101=
20, and the value 20 is set as the scale width on the graph. Furthermore, B
<1.5 (7) Scale value B'=1×10n'
, when B>3.5, (8) Scale value B'=5×10
Let it be n'. (9) Steps (5), (6), (7), (8
) The scale value B' (20 in this example) obtained from “
Adding from 0", 0, 20, 60,..., 100
, 120 , . . . (10) Then, during the addition of the graph scale B', if the range of the graph scale includes the minimum value MIN and maximum value MAX of the graph data, the scale maximum/minimum detection unit 11 detects the values before and after the new values. The minimum value on the scale and the maximum value on the scale. That is, the minimum value of the graph data is 16, but the value 16 is between graph scale 0 and graph scale 20, the minimum value of the scale is 0, and the maximum value of graph data 94 is between graph scale 80 and graph scale 20. The scale is between 100 and the maximum value on the scale is 100. In this way, the graph scales 0, 20, 60, 80, and 100 are determined on the scale display section 10. (11) From the above, the display control section 2' uses the graph display application of the graph display function section 13 to change the graph display frame (x
1 , y1 ), (x2 , y2 ) and graph scale 0
, 20, 60, 80, 100, and graph data 42, 16, 35, 58, 94, 88 are displayed on the CRT1.

As a result, a bar graph as shown in FIG. 3 is displayed. In this example, the physical display position (x1, y1)
A coordinate area in a logical range of 0 to 100 is set at ~(x2, y2), and a bar graph is displayed. That is, by the user specifying only the graph data and the graph display position, the device of the present invention can arbitrarily set the position of the graph display frame, automatically generate the optimal scale interval, and execute the graph display. .

0012

As described above, according to the graph display device of the present invention, scale values and number of scales are automatically obtained by simply providing graph data and graph frame display position data, and the graph is displayed. Therefore, the user can save the trouble of examining the data contents and determining the scale value. Furthermore, since the display position of the graph can be freely set, the screen layout can be set by the user, and by freely using a vacant screen from another application program, it is possible to have a rich variety of display variations.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a graph display device embodying the present invention.

FIG. 2 is a flowchart showing the operation of the device of the present invention.

FIG. 3 is a graph obtained by the apparatus of the present invention.

FIG. 4 is a conceptual diagram of a conventional graph display device.

FIG. 5 is a graph obtained by a conventional graph display device.

[Explanation of symbols]

1 CRT 2 Display control section 2' Display control section 3 Display position setting section 3' Display position setting section 4 Graph/data storage section 5 Logical/physical position conversion section 6 Scale setting section 7 Scale determining section 8 Graph/data maximum/minimum Detection unit 9 Scale generation unit 10 Scale display unit 11 Scale maximum/minimum detection unit 12 Graph frame display unit 13 Graph display function unit

Claims (1)

[Claims] 1. A graph display device having a graph display function and displaying graph data given from a computer, comprising a storage means for securing the graph data and a graph display position, and a maximum value of the graph data. and graph data extraction means for extracting the minimum value, and numerical value A=(
Maximum value - Minimum value)/(Value suitable for graph display)
a calculation means for performing the calculation; a numerical selection means for selecting n (where n is an integer) such that 0.75≦{numerical value B=(said numerical value A)×10n)}<7.5; Number B
a scale determining means for determining a scale value of the graph display according to the value of the scale; and a scale determining means that adds the magnitude of the scale value obtained by the scale determining means from 0 so that the scale value falls within the range of the minimum value and maximum value of the graph data. scale generation means for setting a graph scale using the scale values before and after the scale minimum value and scale maximum value; and the graph data and graph display position in the storage means, the scale determination means, and the scale generation means. A graph display device comprising display control means for displaying a graph from the obtained scale values and graph scale.