| 摘要 |
<p>PURPOSE:To compress the amount of data with numeric value storing continuous line segments by expressing the end X-coordinate of the line segment when a second line segment is in parallel with the X-axis, and expressing the end Y-coordinate when it is in parallel with the Y-axis. CONSTITUTION:When both two continuous line segments are in parallel with the X-axis or the Y-axis, the two line segments continuing with coordinate data of five numeric values can be expressed by the end X-coordinate of the line segment when a second line segment is in parallel with the X-axis and the end Y-coordinate of the line segment when it is in parallel with the Y-axis. In such a manner, the coordinate data of a first line segment is outputted as start coordinate and end coordinate to a memory device in sequence of X1-X2. The start coordinate of the second line segment shows the end coordinate of the first line segment, and second coordinate X2=X3, therefore, it can be Judged that the line segment is in parallel with the Y-axis, and the end Y-coordinate Y3 is added on the first line segment data, and the two line segments are expressed in the coordinate data of five numeric values X1-Y3. Thereby, the amount of data can be reduced from 2(n+1) on a conventional side to (n+3).</p> |
