Diagram drawing apparatus

Details Diagram drawing apparatus Diagram drawing apparatus

1993-03-01

1996-09-17

Powell, Mark R.

395161, G06F 314

Patent

active

055577270

ABSTRACT:
In a diagram drawing apparatus when a figure in the diagram is enlarged or reduced, data at a line having one end tangent to the figure is automatically modified according to the enlargement or reduction of the figure. When a figure, for example, a rectangle of a flowchart representing a processing step, to which a straight line indicative of a flow of the flowchart is connected, is enlarged, data denoting the line end coordinates (end point coordinates) of the straight line tangent to the rectangle and the other line end coordinates (start point coordinates) of the straight line are read out from a diagram data memory and then stored in a data memory. After that, coordinates of an intersection point between the enlarged rectangle and the straight line are calculated and stored in the data memory. The end point coordinates of the straight line stored in the diagram data memory are changed so as to coincide with the intersection point coordinates, thereby drawing a new straight line connected to the changed start point coordinates in the enlarged rectangle.

REFERENCES:
patent: 4760458 (1988-07-01), Watanabe et al.
patent: 4847788 (1989-07-01), Shimada
patent: 4868785 (1989-09-01), Jordan et al.
patent: 5155836 (1992-10-01), Jordan et al.
patent: 5317508 (1994-05-01), Okamoto et al.
patent: 5386507 (1995-01-01), Teig et al.
Systems & Computers in Japan, vol. 18, No. 11, Nov. 1987, New York US, pp. 21-32, XP 000006624, Yasuo Ariki et al., "High-Speed Transformation of Drawing Images Based on Structure Description".

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