| 摘要 |
PURPOSE:To more quickly derive the intersection information of a curve by calculating with regard to stored color information, calculating color information at an intersection of the curve, and thereafter, deriving a coordinate point having the color information concerned, and knowing the intersection information of the curve. CONSTITUTION:Color information of curves (a), (b) is obtained, for instance, by a pixel value, and also, the whole screen is set as a background (c), and its color information is stored 2, respectively. Each picture element in a screen has each pixel value in the case of a color display. Subsequently, by an arithmetic unit 3, an operation is executed so as to derive a value peculiar to an intersection from the color information corresponding to the curves (a), (b). Next, in order to derive a place for satisfying both of two obtained values, they are read out at every picture element from a store device 2 and compared. When a picture element having the color information which coincides with an arithmetic value is obtained, coordinate data of its picture element is a coordinate of a derived intersection. |
