JPH07104875B2 - PERT diagram creation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] The present invention relates to an apparatus for creating a PERT diagram by a personal computer, and an object thereof is to make it possible to easily create a PERT diagram on the screen of the personal computer. Means, coordinate designating means for designating the X and Y coordinates of two points and another Y coordinate on the display screen, and an X coordinate of a bending point of an arrow line connecting the two points from the X coordinates of the two points. A coordinate calculation means for calculating, a pattern indicating a start point and an end point with the coordinates of the two points as the center position, and the coordinates of one of the two points from the coordinate position of the two points passing through the break point. A drawing means for drawing an arrow line to reach the position is provided.

[Industrial application field]

The present invention relates to an apparatus for creating a PERT diagram by a personal computer.

[Conventional technology]

Attempts have been made in various fields to create PERT diagrams on personal computers, but there are still various problems.

For example, when multiple arrow lines are derived from one node, when pulling out each arrow line 12 from the node 11 as shown in FIG. 5, shift the pull-out position so that each arrow line does not overlap. ing. If you do this, you can certainly distinguish each arrow line 12, but this is not easy to see, and if the number of arrow lines 12 drawn from one node 11 is large, it can not be dealt with, and a complicated PERT diagram Cannot be created.

Furthermore, the position of the node 11 and the arrow line 12 drawn from this node 11
It is not easy to specify the drawing position of the drawing or calculate the position.

[Problems to be solved by the invention]

As mentioned above, it has not always been easy to create a PERT diagram on a personal computer, and it has been completed.
The PERT chart was also just in time.

An object of the present invention is to make it possible to easily create a PERT diagram that is visually excellent on the screen of a personal computer.

[Means for solving problems]

As a result of various studies, the inventors of the present application have shown in FIGS. 1 (a) to 1 (c).
PE by combining the 6 types of wires a to f shown in
We have found that RT diagrams can be constructed.

Further, these 6 types of lines can be defined by the X and Y coordinates of the start point 6 and the end point 7 and the Y coordinate of the arrow line 8 on the screen.
However, the X coordinate of the bending point 10 of the arrow line 8 is one unit distance from the starting point 6 (or the ending point 7) to the ending point 7 side (or the starting point 6).
Side).

The present invention is based on the above consideration, and specifies the X and Y coordinates of the start point 6 and the end point 7 and the Y coordinate of the arrow line 8 on the screen, from which the X and Y coordinates of the bending point 10 are determined. Calculate and then draw the start point 6 and end point 7 by drawing a predetermined pattern (using small circles in the figure) that shows the start and end points with the coordinates of the specified start point 6 and end point 7 as the center position, and then draw this start point 6
The arrow line 8 is drawn by drawing a line from the above to the coordinate position of the end point 7 through the coordinate position of the bending point 10.

[Work]

Even if a plurality of arrows are drawn from the same node as described above, if the Y-coordinates of the arrows are different, the X-coordinates of the bending points are the same, but the Y-coordinates are different, so that the line connecting the nodes and the bending points is different. Since the slopes are different, they do not overlap. Therefore, the obtained PERT diagram is visually natural,
Moreover, the distinction between the arrows becomes clear.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

In this embodiment, as shown in FIG. 2 in the PERT diagram creating apparatus, a personal computer having a display screen 1 and a keyboard as an input means 2 is used, and a start point 6 and an end point 7 on the display screen 1 are X and Y.
The coordinate designating means 3 for designating the coordinates and the Y coordinate of the arrow 8 connecting them, the coordinate computing means 4 for computing the coordinates of the bending point 10 from the respective coordinates, and the starting point 6, from the respective coordinates.
The drawing means 5 for drawing the end point 7 and the arrow 8 is provided.

Next, the operation of creating a PERT diagram by this PERT diagram creating apparatus will be described.

First, as shown in FIG. 3, the cursor 9 is moved to a position where the starting point 6 is drawn on the display screen 1 and the position of the starting point 6 is designated [the cursor position in the same figure is for designating the coordinates of arrow lines described later]. It is drawn at the position]. Next, the cursor 9 is moved to the position where the end point is drawn, and the position of the end point 7 is designated. Further, move the cursor 9 to the Y-direction position where the arrow is drawn, and set the start point 6 above.
Specifies the Y coordinate of the horizontal portion of the arrow line 8 connecting the end point 7 and the end point 7.

The X and Y coordinates of the start point 6 and the end point 7 and the Y coordinate of the arrow line 8 have been specified as described above. When the cursor 9 has a finite area instead of a point, the center position of the cursor is the coordinate of the cursor. The reading of the coordinates is performed by the coordinate designating means 3.

Next, the coordinate calculating means 4 calculates from the above-specified three coordinates,
The coordinates of the bending point 10 are calculated. X with 10 bending points
The coordinates are X of the starting point 6 in the a and b types shown in FIG.
It is a value obtained by adding one unit distance to the coordinate, and in the c and d types, it is a value obtained by subtracting one unit distance from the X coordinate of the end point 7. In the e and f types, there are two bending points, one is the value obtained by adding 1 unit distance to the X coordinate of the start point 6, and the other is 1 from the X coordinate of the end point.
It is the value obtained by subtracting the unit distance.

Next, the drawing means 5 first draws a start point and end point pattern centered on the coordinates of the specified start point 6 and end point 7. This embodiment is an example in which this pattern is a small circle. With this, the start point and the end point are drawn.

Next, there are three lines: a line connecting the coordinate position of the start point 6 and the coordinate position of the bending point 10, a line connecting the coordinate position of the end point 7 and the coordinate position of the bending point 10, and a line connecting the two bending points 10. Draw a line. An arrow line 8 connecting the starting point 6 and the ending point 7 is now drawn.

The PERT diagram is completed by repeating the above operations.

A line connecting the starting point 6 or the ending point 7 and the bending point 10 is drawn from the circumference of a small circle indicating the starting point 6 and the ending point 7. In addition, in the above-mentioned four types of lines of a type to b type, the bending point 10 is actually only one of the starting point 6 side or the ending point 7 side,
It may be considered that there is another bending point on the line connecting the bending point 10 and the end point 7 or the starting point 6,
Therefore, the a to d type lines can be drawn in the same way as the e and f type lines.

As described above, in the present embodiment, a visually natural PERT diagram can be easily created only by designating the positions of the start point 6 and the end point 7 and the Y coordinate of the horizontal portion of the arrow line 8.

The present invention is a modification of the above embodiment, in which after specifying the positions of the start point 6 and the end point 7, the types are specified for the lines of types a to d, and the arrows for the lines of types e and f. You may make it specify the Y coordinate of the line 8.

In this modification, if the types of the lines a to d are designated, the coordinates of the bending point 10 can be determined only by the coordinates of the starting point 6 or the ending point 7. That is, the Y coordinate of the position where the horizontal portion of the arrow 8 is drawn is the same as the Y coordinate of the start point 6 or the end point 7,
The line of e, f type uses the fact that it can be determined by 3 points of the Y coordinate of the position where the horizontal part of the start point 6 and the end point 7 and the arrow line 8 should be drawn. In case of a to d type, specify the type. Corresponds to specifying the Y coordinate of the position where the arrow is drawn.

In carrying out the present invention, the cursor movement key on the keyboard 2 is used to move the cursor for designating the coordinate position on the display screen, or a pointing device such as a mouse is used. Needless to say, there is no particular limitation.

FIG. 4 shows an example of the PERT diagram drawn by the above-mentioned embodiment. Even when a plurality of arrow lines are drawn out from the same node as shown in the figure, the inclinations of the arrow lines are different, so that the arrow lines do not overlap, and a visually natural PERT diagram can be drawn.

〔The invention's effect〕

As described above, according to the present invention, a PERT diagram can be easily created using a personal computer, and a visually natural diagram can be drawn.

[Brief description of drawings]

FIGS. 1 (a) to 1 (c) are explanatory views of the principle of the present invention, FIG. 2 is an explanatory view of a main configuration of a PERT drawing creating apparatus according to an embodiment of the present invention, and FIG. FIG. 4 is a diagram showing an example of a PERT diagram obtained by the above-mentioned embodiment, and FIG. 5 is an explanatory diagram of a conventional PERT diagram creating method. In the figure, 1 is a display screen, 2 is a keyboard, 3 is coordinate designating means, 4 is coordinate calculating means, 5 is drawing means, 6 is a starting point, 7 is an end point, 8 is an arrow line, 9 is a cursor, and 10 is a bending point. Indicates.

Claims (1)

[Claims] 1. A display screen (1), input means (2), coordinate designating means (3) for designating X and Y coordinates and another Y coordinate of two points on the display screen, and the two points. Coordinate calculating means (4) for calculating the X-coordinate of the bending point (10) of the arrow connecting the two points from the X-coordinate, and the start point (6) and the end point (with the coordinates of the two points as the central position). 7) and a drawing means (5) for drawing an arrow line (8) from the coordinate position of one of the two points to the coordinate position of the other through the bending point (10). Characterizing PERT drawing device.