JPH03188573A - Drawing device - Google Patents

Abstract

PURPOSE:To simply and quickly secure the connection between straight lines by stopping the movement of a cursor if a drawing line crosses an existing drawn line or spot owing to the movement of a position input means and then drawing a straight line going over the crossing point with a prescribed operation of the position input means. CONSTITUTION:When a start point is inputted by a mouse 5, a line is drawn along a locus of a cursor which connects the start point and the cursor moved with operation of the mouse 5. An input interface 6 detects the moved variable of the mouse 5 and decides it to give this deciding result to a display control circuit 3. If the drawn line crosses an existing drawn line or spot, the movement of the cursor is stopped and a line is drawn between the start point and the crossing point to the existing drawn line or spot. Then the straight lines going over the drawn line are not drawn and no line gets out of the drawn line or spot. Then the movement of the cursor is granted after the mouse 5 carried out a prescribed out a prescribed operation, and a line going over the crossing point is drawn. Thus the connection is secured between the straight lines in a simple and quick operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for drawing lines using a position input means such as a mouse or a trackball, and particularly to a device for drawing lines connecting previously drawn lines or points. Regarding.

[Conventional technology]

A straight line drawing device using a position input device such as a mouse or trackball is called CAD (Computer Aided D).
It is widely used in graphic input devices such as graphics processors and graphics processors. When drawing a straight line using a mouse and connecting it to an already drawn line, conventionally the connected part is enlarged to make it easier to see and the newly drawn line does not protrude from the already drawn line. The end point of the straight line was determined by adjusting the end point position with the mouse.

[Problem to be solved by the invention]

However, when connecting straight lines using the method described above, it is necessary to enlarge and reduce the screen each time the straight lines are connected, which complicates the operation and causes erroneous operations.

The present invention was made in view of the above circumstances, and when connecting a line to be drawn to a line or point that has already been drawn, the connection with the line or point drawn from the starting point is determined, and when the connection is made, the cursor is The movement of the line is prohibited, lines that cross the intersection are not drawn, and when drawing a line that intersects with the drawn line, the line is drawn using a predetermined operation of the position input means.
To provide a drawing device that can quickly connect straight lines with simple operation.

[Means to solve the problem]

A drawing device according to the present invention is a drawing device that moves a cursor displayed on a screen by operating a position input means and draws a line according to the trajectory of the moved cursor, and a detection means that detects the amount of operation of the position input means. and connection determining means for determining the connection between the drawn line and the already drawn drawing point or drawing line based on the detection result of the detecting means; and when the connection determining means determines the connection, the The present invention is characterized by comprising a stopping means for stopping the movement of the cursor, and a movement permitting means for permitting movement of the cursor by a predetermined operation of the position input means when the movement of the cursor is stopped.

[Effect]

In the present invention, when a starting point is input by the position input means, a line is drawn following the trajectory of the cursor connecting the start point and the cursor subsequently moved by operation of the position input means,
When it intersects with an already drawn drawing line or drawing point,
The movement of the cursor is stopped, and the line from the starting point to the intersection with the drawing line or drawing point is drawn, and no straight line beyond that point is drawn, and no line protrudes from the drawing line or drawing point. When a predetermined operation is performed using the position input means, movement of the cursor is permitted, and a line crossing the intersection is drawn.

〔Example〕

Hereinafter, the present invention will be explained based on drawings showing embodiments thereof.

FIG. 1 is a block diagram showing a schematic configuration of a drawing device according to the present invention (hereinafter referred to as the device of the present invention).

In the figure, 1 is a display as a display means using a display screen such as a liquid crystal panel or CRT, and the display 1 is connected to a display control circuit 3 that controls the display based on display data stored in a video memory 2, which will be described later. There is. The display control circuit 3 includes a storage area for window display and is connected to a bitmap video memory 2 corresponding to the display screen of the display 1. The display control circuit 3 is controlled by a control circuit 7 that controls the entire device, and a keyboard 4 and a mouse 5 having a click button 51 are used as input means to input operation commands and data to the control circuit 7 via an input ink face 6. It is connected to the control circuit 7 and the display control circuit 3. Further, a display memory 8 for storing drawn figures is connected to the control circuit 7, and data input from the keyboard 4 and mouse 5 is stored in the display memory 8 via the control circuit 7.

Next, the drawing procedure of the apparatus of the present invention will be explained.

2 to 6 are diagrams showing how a straight line is drawn on the display screen of the display 1, and FIG. 7 is a flowchart showing the drawing procedure. A straight line 11 shown in FIG. 2 is now drawn, and the drawing procedure will be explained using an example in which straight lines 12 and 13 are connected to the straight line r and the points above. First, as shown in Fig. 3, move the cursor to the starting point using the mouse 5, click the click button 51 there, and set the starting point a (
Step l11). Next, when the cursor is moved to the right using the mouse 5 (step 112), a rubber banding straight line connecting the starting point a and the cursor is drawn (step #3). When the cursor crosses the straight line 11, the movement of the cursor stops at the intersection point, and the straight line between the starting point a and the intersection point A is drawn, and the straight line that crosses the intersection point A shown by the broken line in FIG. 2 is not drawn. This is step l1 in which the input ink face 6 detects the amount of movement of the mouse 5 and judges it.
4), This is given to the display control circuit 3, and the display control circuit 3 detects a line or point where the cursor is moved by the mouse 5, and determines whether or not it is connected there.Step #5), the line or point If connected, the cursor movement is stopped there and drawing is stopped (step #6). If there is no connection, the process returns to step I2. Also, if you want to draw beyond the straight line 11 from point b to point C in Figure 3, -
The mouse 5 is then stopped moving, the amount of movement is set to O, and the mouse 5 is moved again (step 17). The amount of movement is determined by the input ink face 6, and when it becomes 0, this is communicated to the display control circuit 3, and as shown in FIG. 4, the cursor is moved again (Step #8), and drawing of the straight line 12 is continued. . That is, permission to continue drawing a straight line is given to the display control circuit 3 by the amount of movement O of the mouse 5.

Next, consider drawing a diagonal line. In this case, first move the cursor to the starting point e and click the click button 51 of the mouse 5 to define the starting point e. Next, by operating the mouse 5, the cursor is moved to a point where the straight line β1 diagonally intersects, and a straight line 13 connecting the starting point e and the intersection d is drawn as shown in FIG. At this time, as in the case of the straight line 12 described above,
If there is a line or point at the destination of the cursor movement, the straight line 13 stops at the point d regardless of the amount of movement of the mouse 5. Then, as shown in FIG. 6, a desired straight line can be drawn by moving the mouse 5 downward, moving the point d downward along the straight line 11 as indicated by the arrow, and aligning it with the dot. In the above operations of the mouse 5, the straight line is determined by clicking the click button 51 of the mouse 5.

Figure 8 is an example of the cursor shown by the mouse 5. For example, when the mouse 5 moves from right to left on the screen, a right arrow is displayed, and in the opposite case, it moves to the left, from bottom to top. When doing so, an arrow pointing upwards will be displayed, and when vice versa, an arrow pointing downwards will be displayed.

Furthermore, when straight lines are connected, diagonal lines in two directions (broken lines) appear at the tips of the arrows, allowing the direction of movement to be visually recognized. Furthermore, by moving the cursor to the four ranges A-D partitioned by these, connection, intersection, and non-connection with a straight line are determined. For example, in the above case, after connecting the straight line 11 at the point d, by moving the cursor in the direction of the range, it is possible to match the point d with the straight line 11 while keeping the top connected. Also, if you move the cursor in the direction of range A at this time, the straight line I13 will change to the straight line 6. It becomes disconnected and becomes disconnected. Furthermore, when the cursor is moved again in the direction of range C after stopping the mouse 5, the straight line 13 intersects and passes through the straight line 11. Note that the straight line l.

When the intersection point d reaches its end while moving the cursor, the cursor will move away from the straight line if the cursor is moved further.

Also, at this time, the above-mentioned broken line disappears, and the cursor becomes only an arrow mark.

Although a mouse is used as the position input means in this embodiment, the present invention is not limited to this, and it goes without saying that other position input means such as a trackball or joystick can be used in addition to the mouse.

Further, in this embodiment, the case where a straight line is connected to a drawn straight line has been explained as an example, but the present invention is not limited to this, and it goes without saying that it can be applied to cases where a curved line is connected to a drawn curve, a drawn point, etc. .

〔effect〕

As explained above, in the present invention, when it is determined based on the amount of movement of the position input means that the straight line being drawn intersects with an already drawn line or point, the movement of the cursor is stopped from the starting point to the intersection. , drawing beyond the intersection point is not performed. Then, by a predetermined operation of the position input means, a straight line that crosses the line is drawn, so that the connection of the straight line to be drawn to the already drawn line or point can be confirmed without performing complicated operations such as enlarging or reducing the drawn line. Alternatively, an equivalent effect can be achieved that can be easily and quickly performed without going beyond the drawing point.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the schematic configuration of the device of the present invention, and FIG.
6 to 6 are diagrams showing the state of drawing a straight line, FIG. 7 is a flowchart showing a drawing procedure, and FIG. 8 is a diagram showing an example of a cursor indicated by a mouse. ■...Display 3...Display control circuit 5...
Mouse 6...Input ink face 51...Click button patent Applicant: Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. In a drawing device that moves a cursor displayed on a screen by operating a position input means and draws a line according to the trajectory of the moved cursor, a detection means for detecting the amount of operation of the position input means. and a connection determining means for determining a connection between a drawn line and an already drawn drawing point or drawn line based on the detection result of the detecting means; and when the connection determining means determines the connection, the A drawing device comprising: a stopping means for stopping the movement of a cursor; and a movement permitting means for permitting movement of the cursor by a predetermined operation of the position input means when the movement of the cursor is stopped.