SEGMENT ENLARGING AND PLOTTING METHOD AND DEVICE THEREFOR

PROBLEM TO BE SOLVED: To improve plotting speed for a system corresponding to individual segments by removing double paint-out and collecting horizontal segments even if the continuous segments are repeated in the vertical direction. SOLUTION: An apex calculation processing S102 obtaining the coordinate values of the respective apexes in a quadrilateral formed by the segments being enlargement objects, an intersection point calculation processing S103 obtaining the coordinate values of the intersection points among the continuous quadrilaterals, an area division processing S104 dividing continuous polygons surrounded by the apexes and the intersection points, which are obtained by this steps, into plural areas and a memory development processing S106 for developing the enlargement/plotting of the continuous segments on a memory by painting out the memory between the intersection point coordinates between the area and a horizontal line in order from the lower coordinate of the divided area in the vertical direction are provided.