Polygon drawing and filling apparatus which initially sorts thre

Details Polygon drawing and filling apparatus which initially sorts thre Polygon drawing and filling apparatus which initially sorts thre

1995-07-05

1997-11-18

Zimmerman, Mark K.

395134, 395501, G06T 1500

Patent

active

056896271

ABSTRACT:
A polygon drawing apparatus for admitting a figure drawing command including command type data and vertex data defining a polygon to be drawn and for outputting raster data about the polygon. On the basis of the command type of the figure drawing command received from a client, the apparatus judges whether or not the target polygon is a plane figure. When the target polygon is judged to be a plane figure, the apparatus performs such processing as face/reverse determination, coordinate transformation and color computations on the polygon, divides the polygon into a plurality of triangles, and converts each of the divided triangles into raster data. If the target polygon is judged to be a non-planar figure, the apparatus divides the polygon into a plurality of triangles, carries out such processing as face/reverse determination, coordinate transformation and color computations on each of the divided triangles, and converts each triangle into raster data. Because any target plane figures are each subjected to the drawing-related processing without undergoing the dividing process, the apparatus shoulders much less burden in carrying out its processing and performs it at a higher speed than before.

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Abrash, Michael, "Polygon Primeval (filling polygons)",Dr. Dobbs,v17, n2, pp. 153-157, Jan. 1992.
Abrash, Michael, "Fast Convex Polyons",Dr. Dobbs,v17, n2, pp., Feb. 1992.

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