| 摘要 |
<p>An apparatus and method for rendering a circle with a radius on a display device comprises (a) providing a set of vertex points; (b) selecting a subset of vertex points from the set of vertex points based on the radius of the circle; (c) scaling each vertex point in the subset of vertex points to produce scaled vertex points; and, (d) connecting the scaled vertex points to approximate the circle. The subset of vertex points may be utilized to determine scaled vertex points for all four quadrants of the circle. The subset of vertex points may be selected by determining the number of vertex points required to render the circle with an error less than a predetermined error threshold. The subset of vertex points is then selected so that the number of members in the subset of vertex points is equivalent to the number of vertex points required to render the circle with an error less than the predetermined threshold. An apparatus and method for rendering a circle with a radius and four quadrants on a display device comprises (a) providing a set of vertex points for one quadrant of the circle; (b) identifying the vertex points for the remaining three quadrants using the set of vertex points; and (c) connecting the vertex points to approximate the circle.</p> |
