JPH03225563A - Graphic selecting system - Google Patents

Abstract

PURPOSE:To efficiently execute graphic specifying and selecting work on a screen by using whether or not a specified position is included in a circle to be changed in size in accordance with the length of a segment in the vicinity of a point as a condition for deciding whether a selected graphic is a point or a segment. CONSTITUTION:The 1st value R is compared with the 1st set value A by a comparator 310 and the real value of the compared result is outputted from the comparator 310. When the 1st value R is larger than the 1st set value A, a segment 104 becomes the final selected graphic. When the 1st value R is less than the 1st set value A, the operation goes to the next process. Then, the 1st value R is compared with a value C and then a real value expressing the graphic is a point or a segment is calculated by a logical operation circuit 312. When the 1st value R is larger than the value C, the segment 104 becomes the final selected graphic. When the 1st value R is less than the 1st value C, the point 103 becomes the final selected graphic. Since the 1st value R is less than the 1st set value A and also less than the value C when the specified position is arranged on the outside of both circles 105, 106, the 1st value R is less than the 1st set value A and the value C, so that the segment 103 is selected.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention uses a two-dimensional coordinate input device such as a mouse to select one point from among a plurality of points and a plurality of line segments displayed on a display screen. This invention relates to a figure selection method for selecting one point or one line segment.

(Prior Art) Conventionally, one point (for example, point 503) or one point from among a plurality of points and a plurality of line segments displayed on a screen 501.
As a figure selection method for selecting two line segments (for example, line segment 504), as shown in FIG. Indicates a position 502 near the figure, selects the point 503 closest to position 502 when the type of figure specified in the menu 505 is a point, and selects the point 503 closest to the position 502 when the type of figure specified in the menu 505 is a line. 5
There is one that selects the line segment 504 closest to 02.

(Problem to be Solved by the Invention) However, in the above-mentioned method, it is necessary to specify in advance whether the type of the selected figure is a point or a line segment in a menu before specifying the position. The selection process becomes troublesome.

Therefore, in order to facilitate the figure selection work, as another figure selection method, as shown in FIG.
point 503 closest to position 502 and position 502
The line segment 504 closest to is searched, and when the distance 506 from the specified position 502 to the point 503 is less than a certain value, the point 503 is selected, and when the distance M506 is greater than the certain value, the line segment 504 is selected. Conceivable. That is, in other figure selection methods, it is determined whether the indicated position 502 is included within a circle 508 representing the vicinity of the point 503,
Point 5 when the indicated position 502 is located inside the circle 508
03 is selected, and when the indicated position 502 is located outside the circle 508, the line segment 504 is selected.

However, in this method, as shown in FIG. 2(d), the length of the line segment 504 is short, and the entire line segment is within 5
08, even if you bring the indicated position 502 close to the line segment 504 and try to select the line segment 504, the distance M506 from the indicated position 502 to the point 503
is always below a certain value, so point 503 is selected.

An object of the present invention is to freely select points or line segments on the screen without limiting the type of selected figure to either points or line segments in advance, even if the length of the line segment near the indicated position is short. The object of the present invention is to provide a graphic selection method that allows selection.

(Means for Solving the Problems) The present invention is a figure selection method for selecting one point or one line segment from among a plurality of points and a plurality of line segments displayed on a screen. Specify a position on the screen, and calculate I! from the nearby point and the nearest point from the position based on the coordinate information of the position. Search for each adjacent line segment that is located at a distance close to , and set a first value R corresponding to the distance from the position to the nearby point to a first setting value set for the first value. A and said first value R
is compared with the ratio C of the second value corresponding to the length of the adjacent line segment and the second set value B set for the second value, and R≦A. and the adjacent point is selected when the relationship R≦L/B (=C) is satisfied, and at least one of the relational expressions R>A and R>L/B (=C) is satisfied. When the adjacent line segment is selected.

(Operation) The operation of the present invention will be explained based on FIGS. 2(a) to (d). 201 is a position specified by the user on the screen using a two-dimensional input device such as a mouse; 202 is a point located closest to position 201 at zero distance; and 203 is a line segment located closest to position 201. 204 is a circle centered on point 202, the radius dimension of which is equal to the first set value A,
205 is a circle centered on the point 202, the radius dimension of which is equal to the ratio C of the second value corresponding to the length of the line segment 203 and the second set value B; 206 is the circle at the position 201; to point 202, and that distance is represented as a first value R. Note that one end of the line segment 203 coincides with the point 202, and the other end coincides with the point 207.

The figure selection method according to the present invention is basically the same as the method described above, in that the point closest to the designated position and the closest line segment are searched for and one of them is selected.

However, in the present invention, as a condition for determining whether to select either the point 202 or the line segment 203, the first value R corresponding to the distance 206 from the indicated position 201 to the point 202 is set to the first set value A. In addition to whether or not the distance is less than or equal to
The first value R corresponding to 06 is less than or equal to the value C of the ratio of the second value B corresponding to the length of the line segment 203. That is, the indicated position 20
A circle 204 with a radius dimension of 1 equal to the first set value A
Whether or not the indicated position 201 is included in the line segment 20
When selecting the 0 point 202, two criteria are used: whether it is included in a circle 205 with a radius dimension that depends on the length of 3, as shown in FIG. 2(a). Point 202 is selected by directing position 201 so that it lies inside both circle 204 and circle 205.

When selecting the line segment 203, in Fig. 2(b) and 2nd Ig(
As shown in C), the line segment 203 is selected by specifying the position 201 to be located outside either or both of the circles 204 and 205.

As a result, if position 201 is brought close enough to point 202, point 2
02 can be selected, and if the position 201 is placed sufficiently close to the line segment 203 and within a certain distance from the point 202, the line segment 203 can be selected.

In addition, the length of the line segment 203 is short and the line segment 203 is a circle 20
4, as shown in Figure 2(d), the circle 20
5 becomes smaller in proportion to the length of the line segment 203. Therefore, the line segment 203 can be selected by specifying the specified position 201 to a position outside the circle 205.

(Example) Fig. 1 is a diagram showing an example of a figure when selecting a figure on the screen using an embodiment of the figure selection method of the present invention, and Fig. 3 is an example of an implementation of the figure selection method of the present invention. It is a device configuration diagram showing an example.

The figure selection method for selecting either one point or one line segment from among a plurality of points and line segments displayed on the screen 101 is as shown in FIGS. 1 and 3. 2, such as a mouse, to specify a position 102 on the screen 101
It includes a dimensional input device 301 and a graphic data file 402 in which data of a plurality of points and a plurality of line segments displayed on the screen 101 are stored.

Position 10 specified by two-dimensional input device 301
The coordinate information of 2 is transmitted from the 2D human-powered device 301 to the point search circuit 303, line segment search circuit 304, and distance calculation circuit 3.
Given on 05. The point search circuit 303 searches the graphic data file 302 based on the coordinate information of the position 102,
The line segment search circuit 304 reads out the point number corresponding to the point 103 located at a very close distance to the position 102.
The graphic data file 302 is searched based on the coordinate information of the position 102, and the line segment number corresponding to the line segment 104 located at the closest distance to the position 102 is read out.

In this embodiment, one end of the line segment 104 is the point 103.
The point number from the zero point search circuit 303, which is located at the point 107 at the other end of the line segment 104, is registered in the register 413. The line segment number from the line segment search circuit 304 is stored in register 4.
14 and is also provided to the length calculation circuit 306.

The distance calculation circuit 305 sends the coordinate information of the point 103 to the graphic data file 30 based on the point number from the point search circuit 303.
2, the distance between the position 102 and the point 103 is calculated based on the coordinate information of the point 103 and the coordinate information of the position 102 from the two-dimensional human cadence device 301, and the first distance corresponding to the distance is calculated. Outputs the value R.

The length calculation circuit 306 calculates the length of the line segment 104 based on the line segment number from the line segment search circuit 304 while referring to the graphic data file 302, and calculates the length of the line segment 104 based on the line segment number from the line segment search circuit 304. Outputs the value of .

The first value R output from the distance calculation circuit 305 is given to a comparison circuit 310 and a comparison circuit 311. The second value output from the length calculation circuit 306 is the multiplier/divider 30
8, and the multiplier/divider 308 divides the second value by the second set value B from the constant setting circuit 307 and outputs the value C to the comparison circuit 311.

The comparison circuit 310 compares the first value R with the first set value A from the constant setting circuit 309, and outputs a truth value 0 when the relationship R≦A is satisfied, and the relationship R>A is satisfied. outputs a truth value of 1 when On the other hand, the comparison circuit 311 compares the first value R with the value C from the multiplier/divider 308, and determines that R≦C
When the relationship R>C is satisfied, a truth value of 0 is output, and when the relationship R>C is satisfied, a truth value of 1 is output.

The truth value from the comparison circuit 310 and the truth value from the comparison circuit 311 are respectively given to the logic operation circuit 312, and the truth value from the comparison circuit 310 and the truth value from the comparison circuit 311 are respectively O. When at least one of the truth value from the comparison circuit 310 and the truth value from the comparison circuit 311 is 1, the truth value 1 is output. The truth value output from the logic operation circuit 312 is registered in the register 315.

Next, the operation of one embodiment of the figure selection method of the present invention will be explained based on FIG. FIG. 4 is a flowchart showing the operation of the graphic selection method shown in FIG.

In step 401, a position 102 on the screen is specified by the user, and the position 102 is
2 coordinate information is output.

In step 4,02, the point 103 closest to the position 102
is searched, and the point number corresponding to the point 103 is output from the point search circuit 303.

In step 403, the line segment 104 closest to the position 102
is searched, and the line segment number corresponding to the line segment 104 is output from the line segment search circuit 304.

In step 404, the distance between the position 102 and the point 103 is calculated, and the distance calculation circuit 405 outputs a first value R corresponding to the distance.

In step 405, the second
The length calculation circuit 306 calculates the value of
The second value from 6 is divided by the second set value B, and the resulting value C (=L/B) is output from the multiplier/divider 308.

In step 406, the first value R is compared with the first set value A, and the comparison circuit 310 outputs the truth value of the comparison result. When the first value R is larger than the first set value A, the line segment 104 becomes the final selected figure. The first value R is the first
is less than the set value A, the process advances to the next step 407.

In step 407, the first value R and the value C are compared, the comparison circuit 311 outputs the truth value of the comparison result, and the logic operation circuit 312 calculates the truth value representing a point or line segment. When the first value R is greater than the value C, the line segment 104 becomes the final selected figure. When the first value R is less than or equal to the value C, the point 103 becomes the final selected figure.

In this embodiment, as shown in FIG.
2 is located outside the circles 105 and 106, so that the first value R is less than or equal to the first set value A and less than or equal to the value C, so the line segment 103 is selected.

(Effects of the Invention) As is clear from the above description, according to the present invention, as a condition for determining whether a selected figure is a point or a line segment, the size changes in the vicinity of a point according to the length of the line segment. By using whether the indicated position falls within the circle or not, you can freely select points or line segments on the screen regardless of the length of the line segments, making it easier to indicate and select shapes on the screen. Become efficient.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a figure when selecting a figure on the screen using an embodiment of the figure selection method of the present invention, and FIG. 2(a) shows the basic operation of the figure selection method of the present invention. A diagram showing an example of the positional relationship between a selected figure on the screen and its designated position for explanation, and FIG. 2(b) is a diagram showing another example of the positional relationship between the selected figure on the screen and its designated position. , FIG. 2(c) is a diagram showing still another example of the positional relationship between the selected figure on the screen and its indicated position, and FIG. 2(d) is a diagram showing the positional relationship between the selected figure on the screen and its indicated position. Diagram showing still another example of the relationship, 3rd
FIG. 4 is a flowchart showing the operation of the figure selection method of FIG. 3, and FIG. 5(a) explains the conventional figure selection method. Figure 5(b) is a diagram showing the positional relationship between the selected figure on the screen and its designated position for explaining another conventional figure selection method. A diagram showing the relationship, FIG. 5(c) is a diagram showing another positional relationship between the selected figure on the screen and its indicated position in the figure selection method in FIG. 5(b). 101... Screen, 102, 201... Indicated position, 1
03.202...point, 104,203...line segment.

Claims (1)

[Claims] A figure selection method in which one point or one line segment is selected from among a plurality of points and a plurality of line segments displayed on a screen, a position is specified on the screen, and coordinate information of the position is selected. The nearest point located at the nearest distance from the position and the nearest line segment located at the nearest distance from the position are respectively searched based on the first value R corresponding to the distance from the position to the nearest point. 1, and compare the first value R with a second value L corresponding to the length of the adjacent line segment. The ratio value C is compared with the second setting B, which is set as R≦A.
and the adjacent point is selected when the relationship R≦L/B (=C) is satisfied, and at least one of the relational expressions R>A and R>L/B (=C) is satisfied. A figure selection method that sometimes selects the adjacent line segments.