| 摘要 |
<p>A process is described for displaying a computer generated outline on a raster output scanner, and for filling a region defined by an outline. A computer terminal is used to generate an outline which is defined by a number of sequences of curve and line segments. After the initial conversion of all curves to approximating parabolic or line segments, all segments are converted to a data structure of initial coordinates and higher order differences. Then a plurality of steppers are used to step through the curves, a scan line at a time, to iteratively create the coordinates of the fill lines in each scan line. <IMAGE></p> |
