| 摘要 |
PURPOSE:To paint out even a polygon with complicated shape by simple processing by drawing a painting-out frame corresponding to the polygon to a work area and painting out the polygon based upon the intersection of the painting-out frame and a horizontal scanning line. CONSTITUTION:A memory 3 and a graphic displaying controller 4 are connected through a bus 2 to a CPU 1. The CPU 1 forms the coordinate data and a command of the graphic to be displayed and supplies them to the graphic displaying controller 4. The graphic displaying controller 4 draws a painting-out frame corresponding to the polygon to a work area 8, and paints out the polygon based upon the intersection of the painting-out frame and the horizontal scanning line. At displaying areas 7A-7D, the painted-out polygon is completed. |
