Tile Based Rendering Of Smooth Points Using Polygons
First Claim
1. A method for rendering a circular point on a display device, the circular point having a center, radius and a circumference and located within a bounding area, comprising the steps of:
- selecting a polygon representing the circular point from a predefined set of polygons;
determining vertices of the polygon;
dividing the bounding area into one or more tiles;
classifying at least one tile of the one or more sections according to the center and the radius of the circular point, wherein the at least one tile is classified into one or more predetermined sections;
generating a mask for the at least one tile according to a section of the at least one tile; and
rendering the circular point according to the mask.
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Accused Products
Abstract
An apparatus and method for rendering a smooth circular point using polygons on a computer graphics display. The circular point is approximated by a polygon and the selection of the polygon depends on the diameter of the point. The polygon is enclosed in a bounding area that is divided into a plurality of tiles. The tiles are classified into different sections depending on their location relative to the center of the point. The tiles in each section are processed according to an algorithm to generate a mask that is used to render the circular point.
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Citations
12 Claims
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1. A method for rendering a circular point on a display device, the circular point having a center, radius and a circumference and located within a bounding area, comprising the steps of:
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selecting a polygon representing the circular point from a predefined set of polygons; determining vertices of the polygon; dividing the bounding area into one or more tiles; classifying at least one tile of the one or more sections according to the center and the radius of the circular point, wherein the at least one tile is classified into one or more predetermined sections; generating a mask for the at least one tile according to a section of the at least one tile; and rendering the circular point according to the mask. - View Dependent Claims (2, 3, 4)
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5. A method for rendering a circular point on a display device, the circular point having a center, radius and a circumference, comprising the steps of:
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approximating the circular point by a polygon; defining a bounding area for the polygon; dividing the bounding area into one or more tiles; generating a mask for each tile; and rendering the circular point according to the mask. - View Dependent Claims (6, 7, 8)
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9. An apparatus for rendering a circular point on a display device, the circular point approximated by a polygon bounded by a bounding area, the polygon having an internal area and an external area within the bounding area, comprising:
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a polygon database; a vertex database; an edge evaluator in communication with the polygon database and the vertex database, the edge evaluator receiving polygon information from the polygon database and vertex information from the vertex database and determining whether a point in the bounding area is internal or external to the polygon; and a drawing element in communication with the edge evaluator, the drawing element approximating the circle by rendering every point in the bounding area depending on whether the point is in the internal area or external area of the polygon. - View Dependent Claims (10, 11)
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12-19. -19. (canceled)
Specification