| 摘要 |
PROBLEM TO BE SOLVED: To identify and display lines, whose length is equal and angles whose angles are equal in a graphic display device. SOLUTION: In the graphic display device 10, a CPU 1 calculates the length of a drawn line; extracts a line that has already been displayed at a display section 2 and has the same length; and adds the same identification mark for displaying at the display section 2. Additionally, a straight line, crossing a drawn straight line, is extracted; the crossing angle of the two straight lines is calculated; a crossing angle that has been already displayed at the display section 2 and has the same angle is extracted; and the same identification mark is added for displaying at the display section 2. COPYRIGHT: (C)2005,JPO&NCIPI
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