| 摘要 |
For a polygon without self-intersection, with one of line segments constituting the outline of the polygon selected sequentially in the counterclockwise rotation, all the bits in the right direction of the selected line segment on the horizontal coordinate, inclusive of those for the selected line segment, on the plane work area (1 bit/pixel) of the work memory are inverted to draw (Step S22). Subsequently, only some of the line segments constituting the outline of the polygon whose vectors are in the upward direction (which makes an upward vertical-coordinate variation) are further drawn on the work memory (2A) (Step S23). Finally, the drawing information is transferred with extension from the work memory to the display memory (Step S24). Having the above steps, a method for achieving proper filling of a polygon with a decrease in load on a processor is provided. <IMAGE> |
