| 摘要 |
PURPOSE:To shorten the drawing time of a thick line and to avoid incomplete paint-out by producing an optional line with a function parameter and shifting the line in parallel by an amount equal to its thickness to pain out an area enclosed by a contour line connecting the start and end points. CONSTITUTION:The start and end point addresses Axy and Bxy, the curvature center Oxy and the parameters such as the thickness parameter R, etc. of a segment of an area defined by the coordinate systems X and Y of a screen image memory 9 are decoded respectively. Then segment which is converted at a coordinate conversion part 4 and applied to a function line generator 5 to connect both start and end points on a working buffer 6 is written on the coordinate systems X and Y of the buffer 6. Then the segment is shifted in the X or Y forward scan direction with reference to the thickness parameter for decision of the start and end points. A segment connecting both points is written together with a straight line connecting both points. Thus a close contour is formed on the buffer 6. A procedure control pat 3 executes conversion for paint-out of a surface. |
