| 摘要 |
PURPOSE:To omit the determination of an included graphic and to shorten a graphic processing time by providing a graphic processor with an intersection possibility deciding means for deciding intersection possibility from relative positional relation between a set graphic and a plotted area and a graphic output control means. CONSTITUTION:An existing area on the coordinate face of a reference line of a set graphic is determined and intersection possibility is decided from the coordinate values of respective end points of the reference line regulating the existing area and the coordinate value of a boundary line of a plotted area. An inside reference area separated from respective positions of the boundary line of the plotted area to the inside of the plotted area by alpha/2 to be a half of the width alpha of the set graphic is set up and whether the whole existing area is included in the inside reference area or not is decided by the intersection possibility deciding means. When the area exists, the intersection possibility of the set graphic does not exist is decided and the determination of the included graphic is omitted by a graphic output control means. Consequently, graphic processing can be uselessly executed and the required time can be shortened. |
