Graphic display device having graphic generator for shading grap

Details Graphic display device having graphic generator for shading grap Graphic display device having graphic generator for shading grap

1982-01-18

1985-08-27

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340729, 340722, 340793, G09G 116

Patent

active

045381445

ABSTRACT:
A graphic display device for shading the region between one straight line L.sub.1 connecting two points P.sub.1 and P.sub.2 and another straight line L.sub.2 parallel to the Y axis or the X axis, including a straight line coordinates generator to define a line L.sub.1 which connects the two points P.sub.1 and P.sub.2, an X or Y coordinates generator to count X or Y coordinates from a point T.sub.t on the line L.sub.1 given by the straight line coordinates generator in a predetermined direction, a controller for signalling the straight line coordinates generator when the X or Y coordinates generator completes generation of the coordinates for a selected shading line, a detector for detecting the intersections of the lines L.sub.1 and L.sub.2 in accordance with the number of the lattice points designated to provide shading on a selected shading line, a changer for changing the counting direction of the X or Y coordinates generator after detecting the intersection of the lines L.sub.1 and L.sub.2, and a shading display device to shade a region between the lines L.sub.1 and L.sub.2 in accordance with the coordinates of the lattice points designated to provide shading as designated by the straight line coordinates generator and the X or Y coordinates generator for the shading lines. The graphic display device sequentially generates shading lines parallel to either the X-axis or the Y-axis lightening the designated lattice points of a CRT or an X-Y plotter until all of the area between the two lines is shaded, thus simplifying the circuit architecture of the device.

REFERENCES:
patent: 3778811 (1973-12-01), Gicca
patent: 3925776 (1975-12-01), Swallow
patent: 3944997 (1976-03-01), Swallow

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