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in scan line polygon fill, each can line crossing a polygon, the area fill algorithm locates the intersection point of the scan line with the polygon edges. These intersection points are then stored from left to right and the corresponding frame buffer positions between each intersection painr are set to the specified fill color.

In boundary fill, approach to area filling is to start at a point inside a region and paint the interior outward toward and the boundary.

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Q: Compare scanline polygon fill with the boundary fill algorithm?
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