JPS63150767A - Ellipse input system - Google Patents

Abstract

PURPOSE:To decrease the processing time by specifying 1st and 2nd coordinates and drawing an ellipse inscribing a rectangle having line segments tying both the coordinates as diagonal lines so as to facilitate the shape recognition of the expected ellipse thereby reducing number of indicated points and fetched points. CONSTITUTION:A coordinate input is applied by using a mouse 2 to draw an ellipse, then the item of the ellipse in the picture drawing item menu 3 is indicated by a cursor 5, a fetch switch 2a is operated to obtain the ellipse drawing mode. Then the 1st fetch point 17 on the drawing pattern 4 is specified by the cursor 5 and the cursor 5 is moved to specify the 2nd fetch point 18, and a rectangle 19 using a line segment tying the points 17, 18 and one side of which is in parallel with the scanning line is displayed. In specifying the point 18, the rectangle 19 is erased and an ellipse 6 inscribed onto the rectangle 19 is drawn. Thus, the shape recognition of the expected ellipse is facilitated and number of indicated points and fetch points is decreased and the processing time is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ellipse input method in a figure drawing device that draws figures by inputting coordinates using a coordinate input device such as a mouse.

[Conventional technology]

FIG. 3 shows an example of a commonly used graphic drawing device and its screen. In the figure, 1 is a display device such as a CRT, 2 is a mouse that is a coordinate input device, 3 is a drawing item menu displayed on display device 1, 4 is also a drawing screen, and 5 is a drawing specified by mouse 2 This cursor is always displayed at a position on the screen 4, and normally this cursor 5 moves on the drawing screen 4 according to the amount of movement of the mouse 2, and the display position becomes the coordinate input position. The mouse 2 has a capture switch 2a that captures the display position of the cursor 5 to a CPU (not shown).
is provided. 6 is an example of an ellipse drawn by the conventional input method on this graphic drawing device, 7, 8, and 10 are coordinates inputted using the mouse 2,
They will be referred to as a first capture point, a second capture point, and a third capture point, respectively. These capture points 7, 8, and 10 are bright points F
” is displayed as 7.

Next, the operation will be explained. When drawing an ellipse whose long axis or short axis is parallel to the scanning line on a graphics drawing device, first move the cursor 5 onto the drawing item menu 3 of the display device 1 in FIG. Indicate the item,
Operate the capture switch 2a to set the ellipse drawing mode.

Next, coordinate information that satisfies sufficient conditions for determining the ellipse 6 to be drawn is instructed to the drawing screen 4 using the mouse 2, and the desired ellipse 6 is drawn using the capture switch 2a. . In this example, the coordinate information includes the center of the ellipse 6, one end point of the short axis, one end point of the long axis, and the first intake point 7. Second capture point8. The third capture point 1o is designated and captured. An ellipse 6 is drawn when the third designated point 1o is taken in.

[Problem that the invention seeks to solve]

The conventional ellipse input method in such graphic drawing devices is
Due to the nature of the shape of an ellipse, when specifying and importing coordinates, the first import point 7. is displayed on the drawing screen 5. Second capture point8. Only the third indicated point 10 that is captured last is shown, and the visually drawn ellipse is not actually displayed, making it difficult to recognize the expected shape of the ellipse. There was a drawback that the number of acquisition points was large and the operation was slow.

This invention was made to solve the above-mentioned problems, and aims to provide an ellipse input method that allows easy recognition of the expected shape of an ellipse, has few instruction points and capture points, and shortens processing time. .

[Means for solving problems]

In this invention, the step of specifying an arbitrary position on the display screen 4 (step S2), the step of capturing the coordinates 17 of the specified position, and the step of specifying and capturing the first coordinates 17 are obtained. Identifying stage (Step S
3) Instructing an arbitrary position to be the second coordinate 18 (step S4), and displaying a rectangle 19 whose diagonal is a straight line connecting the designated position 18 and the first coordinate 17 (step 35) and a step of drawing an ellipse 6 inscribed in the rectangle 19 (step S8) by capturing the indicated position 18 and specifying it as the second coordinate 18 (step S6).

[Effect]

The constantly displayed rectangular shape 9 specified by the first coordinate I7 and the second coordinate 18 then moves to the second intake point 18.
The position and shape of the ellipse 6 to be drawn at the time when the ellipse 6 is determined can be easily associated visually, and the number of coordinates to be specified can be reduced to 2 points.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a graphic drawing device to which the present invention is applied and its screen. In the figure, 1 is a display device such as a CRT, 2 is a mouse which is a coordinate input device, 3 is a drawing item menu displayed on display device 1, 4 is also a drawing screen, and 5
is a cursor that is always displayed at a position specified by the mouse 2 on the drawing screen 4. The mouse 2 is provided with a capture switch 2a that captures the indicated position of the cursor 5 into a CPU (not shown). 6 is an ellipse drawn by the input method of the present invention on this graphic drawing device, and 17.1
Reference numeral 8 indicates the captured coordinates of the position indicated using the mouse 2, and these are called a first capturing point and a second capturing point, respectively. These capture points 17 and 18 are displayed as bright dots, and a rectangle 19 with a straight line connecting these two points as a diagonal line and one side parallel to the scanning line is displayed.
is inscribed in

Next, the operation will be explained according to the flowchart shown in FIG. First, in step S1, the cursor 5 is moved onto the drawing menu 3 of the display device 1 shown in FIG. 1 using the mouse 2, the ellipse item is designated, and the capture switch 2a is operated to set the ellipse drawing mode.

Next, in step S2, the cursor 5 is moved on the drawing screen 4.
is moved using the mouse 2 to indicate a desired point, and in step S3, the capture switch 2a is operated to specify the first capture point 17.

Next, in step S4, the mouse 2 is used to move the cursor 5 to point to the second capture point 18.

During this time, in step S5, the first capture point 17 and the second capture point 18 indicated by the cursor 5 are displayed on the drawing screen 4.
A rectangle 19 whose diagonal line is a straight line connecting the lines and whose negative side is parallel to the scanning line is displayed. According to the judgment in step S6, the second
If the capture point 18 has not been specified, the process returns to step S4, and the rectangle is repeatedly redrawn as needed, using the location where the cursor 5 has moved as the designated point. If the second capture point has been identified as determined in step S6, the process proceeds to step S7, where the rectangle 19 is erased, and in step S8, an ellipse 16 inscribed in the rectangle 19 is drawn.

In the above embodiment, the cursor 5 and the rectangle 19 are displayed at the same time after the first capture point 17 is specified and the second capture point 18 is designated, but due to the deformation of the cursor 5, In the drawing method that can display a rectangular cursor with one predetermined point as an end point and corresponding to the amount of movement of the mouse 2, a rectangular cursor is displayed when the first capture point 17 is specified, and this In this case, a diagonal line is created between a predetermined point and the first intake point 17. Second intake point 1
The same effect can be obtained by using a method of returning to the normal cursor 5 when specifying 8 and specifying a new predetermined point.

〔Effect of the invention〕

As explained above, according to the present invention, the step of specifying an arbitrary position on the display screen, the step of importing the coordinates of the specified position, and the step of specifying and importing the coordinates are performed. a step of specifying the first coordinate, a step of specifying an arbitrary position to be the second coordinate, a step of displaying a rectangle whose diagonal is a straight line connecting the specified position and the first coordinate, and a step of importing the specified position. and a step of drawing an ellipse inscribed in the rectangle by specifying the second coordinates at Since the number of operations and the number of coordinate indications are also reduced, there is an effect that a desired ellipse can be input at high speed.

[Brief explanation of the drawing]

FIG. 1 is a front view of a graphic drawing device in which the ellipse input method of the present invention is implemented and a diagram drawn on the display screen, FIG. 2 is a flowchart explaining the present invention in detail, and FIG. 3 is a conventional graphic drawing device. Front view and conventional drawing. 1... Display device, 2... Mouse, 2a... Capture switch, 3... Drawing item menu, 4... Drawing screen, 5... Cursor, 6... Ellipse, 17. 18・
...Intake point, 19...Rectangle. Agent Masu Oiwa 1 (2 idiots) lol 2
Shoplifting Akame 70-Chiv-) Figure 3

Claims (1)

[Claims] In a graphic drawing method, there are a step of specifying an arbitrary position on a display screen, a step of importing the coordinates of the specified position, a step of specifying the first coordinates through these steps of specifying and importing, and a step of specifying the first coordinates. a step of indicating an arbitrary position that is the coordinate of the second coordinate, displaying a rectangle whose diagonal is a straight line connecting the specified position and the first coordinate, and capturing the specified position and specifying it as the second coordinate. an ellipse input method comprising the steps of: drawing an ellipse inscribed in the rectangle;