METHOD FOR DRAWING 3 DIMENSIONAL STRAIGHT LINE OF COMPUTER GRAPHICS, ESPECIALLY IN RELATION TO DRAWING A 3 DIMENSIONAL STRAIGHT LINE BY USING PRIOR HARDWARE OF DRAWING A 3 DIMENSIONAL TRIANGLE

摘要

PURPOSE: A method for drawing a 3 dimensional straight line of computer graphics is provided to draw a 3 dimensional straight line by using prior hardware of drawing a 3 dimensional triangle without adding new hardware. CONSTITUTION: A system decides whether an inclination of a straight line is 0, or bigger than or equal to 1, or smaller than 1. If the inclination is 0, the system draws a dot between both end dots of the straight line with a height 1. If the inclination is bigger than or equal to 1, the system draws dots between the first value and the second value according to the first dot produced by subtracting 0.5 from an 'x' value where a top 'y' axis meets the straight line, and the second dot produced by adding 0.5. The system draws the dots along an 'x' axis as increasing a 'y' value according to the inclination of the straight line. If the inclination is smaller than 1, the system draws dots between the first and second values according to the first dot produced by subtracting a value which divides 1 into a value which multiplies an absolute value of the inclination by 2 in the 'x' value, and the second dot produced by adding a value which divides 1 into a value which multiplies the absolute value of the inclination by 2. The system draws the dots along the 'x' axis as increasing the 'y' value.