Methods for calculating the trigonometric function using linear equations

摘要

PURPOSE: A method for calculating a trigonometric function using a linear equation is provided to reduce an error range through a linear equation, thereby promptly generating video of better quality. CONSTITUTION: A section of an X-axis in a trigonometric function curved surface is equally divided. Values of crossing points where vertical straight lines at boundary points of the divided sections cross the trigonometric function curved surface are obtained. Values of a trigonometric function to values of the sections are obtained by using a straight line equation connecting neighboring points in the obtained crossing points. Color values of fragments are decided by the obtained values of the trigonometric function. The section of the X-axis in a trigonometric function curved surface ranges from 0 to 90 deg.