| 摘要 |
PURPOSE:To plot only one straight line in each time without user's consciousness of a start point by setting up a point with a smaller coordinate value as a start point without fail at the time of plotting a straight line connecting two given points. CONSTITUTION:A plotting direction reverse processing means 2 compares the coordinates of given start and end points on a bit map display with each other, and when the coordinates of the start point are larger than that of the end point, the start point and the end point are exchanged and a straight line plotting processing means 3 plot a straight line from the start point up to the end point applied by the means 2. Since only one straight line is plotted in each time, the user can be prevented from being conscious of the start point. |
