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Converting stroked primitives to filled primitives
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DOI：10.1145/3386569.3392392.png)
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摘要
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Vector graphics formats offer support for both filled and stroked primitives. Filled primitives paint all points in the region bounded by a set of outlines. Stroked primitives paint all points covered by a line drawn over the outlines. Editors allow users to convert stroked primitives to the outlines of equivalent filled primitives for further editing. Likewise, renderers typically convert stroked primitives to equivalent filled primitives prior to rendering. This conversion problem is deceivingly difficult to solve. Surprisingly, it has received little to no attention in the literature. Existing implementations output too many segments, do not satisfy accuracy requirements, or fail under a variety of conditions, often spectacularly. In this paper, we present a solution to the stroke-to-fill conversion problem that addresses these issues. One of our key insights is to take into account the evolutes of input outlines, in addition to their offsets, in regions of high curvature. Furthermore, our approach strives to maintain continuity between the input and the set of painted points. Our implementation is available in open source.
Keyword:
stroke
vector graphics
offset curves
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