| 摘要 |
PURPOSE:To increase the speed of drawing which uses the vector font by referring to stored coordinate values and calculating the outer product of two vectors, and determining a triangle to be painted out. CONSTITUTION:A processor 1 reads a program out of a ROM 2, reads the coordinate values of a vector for drawing the contour of a character stored in a RAM 3 to draw the contour of the character on an image memory 4, and paints out the bits in a closed area segmented with the contour. For example, it is checked whether there are other points in a triangle DELTAABC and when not, the inside of the triangle DELTAABC is painted out. Then the coordinate value of the RAM 3 indicated by a point B is given a deletion mark and the operation is finished when the number of dots which are not given the deletion mark reaches two. Consequently, a drawn character can be painted out quickly on a vector font basis. |
