JPH01124065A - Graphic display device - Google Patents

Abstract

PURPOSE:To easily display a specified rectangular area around a center point on the screen of a display device by displaying a rectangle defined by setting up a 1st point specified by a specifying means as the center and setting up another specified point as one vortex by means of a rectangle display means. CONSTITUTION:A point cursor is moved to a position x1, y1 to be the center of a rectangular area to be set up on a display screen by operating a mouse 3 and the point is specified as a 1st point 4. A control device 1 stores the coordinates of the 1st point 4 in its internal storage means. When the position of the point cursor point 4 is moved, the control device 1 displays a rectangular cursor 8 defining the 1st point 4 as the center and the lower right point 5 to be the point cursor position at that time as one vortex. Consequently, the rectangular area 8 accurately specified at its center point 4 can be specified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a graphic display device in which an operator inputs coordinates using a coordinate input device such as a mouse, and particularly to a method for inputting a rectangular area.

[Conventional technology]

FIGS. 3A and 3B are diagrams illustrating a conventional graphic display device of this kind and an explanatory diagram of an example of its display screen.
In the figure, (1) is a control device whose processing is executed by a microprocessor, etc., and (2) is this control device 11).
A display device (3) is a mouse that inputs two-dimensional coordinate values on the display screen of the display device (2) to the control device 11). 14) and (5) are the first and second points whose positions are input by moving the cursor with the mouse (3) and displayed on the screen of the display device (2) by the control device 11), and (6) is This is a rectangular cursor displayed on the display device (2) by the control device II+ as a rectangle with the first and second points as diagonal points.

Next, a description will be given of the operation when specifying an arbitrary rectangular area on the display screen of the display device (2) by operating the mouse (3). First, when the mouse (3) is moved, its position information is input to the control device 111, and the control device 11) changes the display position of the point cursor on the display screen in accordance with the movement of the mouse (3). Therefore, by moving the point cursor that moves in conjunction with the mouse (3) to any position on the display screen, it is possible to designate the point at the desired position on the display screen as the first point (4).

Next, when the point cursor is moved from there, the control device 11: controls this point cursor position (5) and the first
A rectangle whose diagonal points are point (4) is displayed as a rectangular cursor (6). This rectangular cursor (6) is displayed while changing its length and width following the movement of the point cursor. Therefore, by specifying the second point (5) with the mouse (3), the first
A desired rectangular area having the second points (4) and (5) as diagonal points can be determined.

FIG. 4 shows the control device (
The flowchart of FIG. 4 will be explained below using the flowchart showing the operation of step 1). First, in step +II, the presence or absence of movement of the mouse (3) is detected.

If movement is detected, proceed to step αυ. In step aυ, the display position of the point cursor is changed in accordance with the movement of the mouse (3).Next, in step α2, it is detected whether or not the first point has been specified.

If no specification has been made, return to step [1G.

If the first point has been designated, the process advances to step a3. In step a3, the position of the point cursor at the time when the first point was specified in step az ("1+
y1) as the first point coordinate. Next, in step ++4], detect the presence or absence of movement of the mouse (3),
If movement is detected, the process advances to step α9. In step α9, the point cursor is moved in accordance with the movement of the mouse (3), and the above first point coordinates (3:+, 3'+) are set.
A rectangular cursor (6) whose diagonal points are this point cursor position is displayed.

Step (161 detects whether or not the second point designation has been performed, and if the designation has not been performed, step α
Returning to step 4, if the second point designation is performed, the process proceeds to step αη. The position of the point cursor (f2.y2
) are the second point coordinates.

By the above operation, the first point (3:1.y+)
The coordinates of the second point (x2.3+2) are determined as the coordinate values indicating the rectangular area specified by the operator, and are output to various devices.

[Problem that the invention seeks to solve]

Conventional graphic display devices are configured as described above, so when specifying a rectangular area centered on one point on one screen,
This is done by the operator visually specifying a first point and a second point whose center is the target position. Therefore, it is difficult to accurately align the center of the specified rectangular area to the desired position.

Another problem is that it takes time.

The present invention has been made to solve these problems, and it is an object of the present invention to provide a graphic display device that can specify a rectangular area with an accurate center point specification.

[Means for solving problems]

The graphic display device according to the present invention includes: an instruction means for indicating an arbitrary point on the screen of the display device; a storage means for storing the coordinates of a first point specified by the instruction means; rectangle display means for causing the display device to display a rectangle centered on the coordinates of the first point specified by the user and having one vertex at an arbitrary point indicated by the instruction means. .

[For production]

In this invention, the first point indicated by the indicating means on the screen of one display device is centered.

And since the rectangle whose one vertex is another point indicated by the indicating means is displayed by the rectangle display means,
The rectangular area with the designated center point can be easily displayed on the screen of the display device.

〔Example〕

FIG. 1 [a] shows a configuration diagram of a graphic display device according to the present invention, and similarly to the conventional example shown in FIG. It is composed of. FIG. 1(b) is an explanatory diagram showing an example of a display screen by the graphic display device of the present invention.
) and (5) are the first and second points whose positions are indicated by the movement of the point cursor with the mouse (3) and are displayed on the screen by the control device (11), and (8) is the first point (4). This is a rectangular cursor that forms a rectangle with the center and the second point (5) as the lower right vertex.This rectangular cursor (6) is
performs arithmetic processing based on the first and second points (4) and (5), and calculates the coordinates of the top left vertex (7) (
”31 y3) and the coordinates of that point (x3゜y3
) and the coordinates of the second point (5) ("2. y2)
This is what is displayed on the display device (2) according to the following.

Next, the operation when specifying an arbitrary rectangular area on the display screen of the display device (2) according to the present invention will be explained. When the mouse (3) is moved, its position information is input to the control device (1), and the control device 11) can change the display position of the point cursor on the display screen in accordance with the movement of the mouse (3). .For this reason, first use the mouse (3
) to set the point cursor on the display screen at the desired center of the rectangular area (zl, yl)
and designate that point as the first point (4). The control device 11) stores the coordinates of this first point (4) in its internal storage means. Next, if you move the point cursor from this first point (4),
Control device] 1) is centered on the first point (4), and the lower right point (
Display a rectangular cursor (8) whose apex is 5). This rectangular cursor (8) is displayed while changing its four apex positions, that is, its length and width, in accordance with the position of the point cursor that moves in accordance with the movement of the mouse (3). Then, if the operator specifies the point cursor position as the second point) +51 at a position corresponding to the size of the required rectangular area.

Control device +11 is from the coordinates of the point cursor at that time, that is, the coordinates (J2.3'2) of the second point (5).

Calculate the coordinates ("313'3) of the diagonal point (7) that is paired with the second point (5) in the rectangular area. This coordinate value ("3.3'5) and (, f2. If y2) is output to the outside as a diagonal point of a rectangular area.

A rectangular area whose center position is accurately specified can be specified by specifying a set of coordinate values of diagonal points as in the conventional method.

FIG. 2 is a flow chart for explaining the operation of the control device 111 during the above-mentioned rectangular area designation operation using the graphic display device of the present invention. The following explanation will be given according to this flowchart. Step no. of the flowchart
-+141 is the same as the conventional case shown in FIG. 4 described above, so the steps starting from step (tSa) will be explained. That is, in step (+Sa), move the point cursor in accordance with the movement of the mouse (3), and then move the point cursor to the lower right point (5), which is centered on the first point (4) and is the current point cursor position. Find the coordinates C3'5+y3) of the upper left vertex of the rectangular cursor (8) whose vertex is C3'5+y3) from the coordinate values of the first and second points (4) and (5]. In other words, the first point 14) coordinates (-rl
, yl) and the coordinates of the current point cursor (r2.y
From 2): t3==2. fl-Z'2゜3'3=23'
+3'2 calculation processing is performed. Step (+s
In b), the coordinates ("3.
y3) and the coordinates of the point cursor (x2°y2), a rectangular cursor (8) with these as diagonal points is displayed. In step OFF, it is determined whether or not the second point designation has been performed, and if the second point designation has not been performed, the process returns to step α. When the second point (5) is specified with the mouse (3), the rectangular area to be specified is confirmed, and in step (+7a), the coordinates of the point cursor at that time ("2+3'2)" and Calculated at that time ( x3
．． 3+3) is determined as the coordinate of the diagonal point that defines the rectangular area.

Coordinate values of these two points ("213'2), C-37'13"
), it is possible to specify a rectangular area as in the conventional method by specifying two diagonal points, and also to reliably specify the center point of the rectangular area.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a storage means for storing the coordinates of a first point specified by an instruction means for specifying an arbitrary point on the screen of a display device, and , and a rectangular display means for displaying a rectangle having one vertex at the point indicated by the above-mentioned indicating means, so that a rectangular area centered on the first point designated by the operator is displayed. This has the advantage that when specifying a rectangular area, the center position can be easily and reliably aligned with the desired position.

[Brief explanation of the drawing]

FIG. 1 (a) is a configuration diagram showing a graphic display device according to the present invention, FIG. 1 (b) is an explanatory diagram showing an example of its display screen, and FIG. ) and (b) are a configuration diagram showing a conventional graphic display device and an explanatory diagram of an example of its display screen, and FIG. 4 is a flowchart explaining its operation. In the figure, 11) is a control device, (2) is a Display device, (
3) is the mouse, (41 is the first point, (5n is the second point)
The point +61+81 is displayed with a rectangular cursor. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] An instruction means for indicating an arbitrary point on a screen of a display device, a storage means for storing the coordinates of the first point specified by the instruction means, and the coordinates of the first point stored in the storage means. A graphic display device comprising: rectangle display means for causing the display device to display a rectangle whose center is , and whose apex is an arbitrary point indicated by the instruction means.