Abstract: Outlines of a polygon are rendered using a set of rules to determine whether each pixel defining the polygon is to be activated. Following the set of rules, the pixel is not activated when the pixel is the last pixel of the line being drawn in a negative direction or the pixel is the first pixel of the line being drawn in a positive direction. Further, the pixel is capable of being activated when the center of the pixel lies on or to the right of the line, the pixel is the first pixel of a horizontal group of pixels and the line is located in the fifth or seventh octant, or the pixel is the last pixel of the horizontal group and the line is located in the first or third octant. The value determined from the above rules is then exclusive ORed with the current pixel value to determine if the pixel is to be rendered. After the outline is rendered, the outline is filled.