| 摘要 |
PROBLEM TO BE SOLVED: To quickly plot a circle by simple processing without any floating point calculation by approximately plotting the circle by connecting several points on the circuit with straight lines. SOLUTION: Each point coordinate 1 arranged at equal intervals on the circumference of a reference circuit 3 is stored in a data table. Circle plotting is started by using the central coordinate and the radius of a circle to be plotted as a parameter. The coordinate (xn, yn) of one point on the reference circumference is read from the table and the start point coordinate of a straight line to be actually plotted is calculated from the coordinate, the central coordinate and the radius of the reference circle 3 and the central coordinate and the radius of the circuit to be plotted. Then, coordinates (x(n+1), y(n+1)) next to one point coordinate (xn, yn) on the reference circumference are read from the table, the end point coordinate is calculated by operating the similar calculation to the start point coordinate and the straight line is plotted between the start point coordinate and the end point coordinate. This processing is repeated so that an approximate circuit can be plotted. |
