DIGITAL LINE SEGMENT GENERATING CIRCUIT

PURPOSE:To generate the high speed line segment while a high frequency action is avoided, and to improve the drawing speed by evaluating the inclination of a line segment from a reference point and performing the interpolation operation. CONSTITUTION:A data input part 10 inputs the data of the starting point and the end point of a line segment, the value which becomes the base of the length and inclination calculation of the line segment is obtained, and supplied through an accumulative adding part 14 to each DDA 16. At the time of starting the line segment preparation, a basic calculating part 12 supplies the starting point as the reference value through the accumulative adding part 14 to each DDA 16. Each DDA 16 generates a dot which is in charge by itself. The number of the DDA 16 is 4 pieces, and it is in charge of first dot-fourth dot. The DDA 16 related to the fourth dot supplies the coordinates to the accumulative adding part 14. The accumulative adding part 14 renews and sets the coordinates to the reference value and each DDA 16 performs the same dot generating action based on the reference value. By repeating the action, the line segment of the starting and end points is generated.