29 lines
1.6 KiB
C
29 lines
1.6 KiB
C
// Copyright 2013 Howling Moon Software. All rights reserved.
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// See http://chipmunk2d.net/legal.php for more information.
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/// Function type used as a callback from the marching squares algorithm to sample an image function.
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/// It passes you the point to sample and your context pointer, and you return the density.
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typedef cpFloat (*cpMarchSampleFunc)(cpVect point, void *data);
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/// Function type used as a callback from the marching squares algorithm to output a line segment.
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/// It passes you the two endpoints and your context pointer.
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typedef void (*cpMarchSegmentFunc)(cpVect v0, cpVect v1, void *data);
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/// Trace an anti-aliased contour of an image along a particular threshold.
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/// The given number of samples will be taken and spread across the bounding box area using the sampling function and context.
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/// The segment function will be called for each segment detected that lies along the density contour for @c threshold.
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CP_EXPORT void cpMarchSoft(
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cpBB bb, unsigned long x_samples, unsigned long y_samples, cpFloat threshold,
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cpMarchSegmentFunc segment, void *segment_data,
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cpMarchSampleFunc sample, void *sample_data
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);
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/// Trace an aliased curve of an image along a particular threshold.
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/// The given number of samples will be taken and spread across the bounding box area using the sampling function and context.
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/// The segment function will be called for each segment detected that lies along the density contour for @c threshold.
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CP_EXPORT void cpMarchHard(
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cpBB bb, unsigned long x_samples, unsigned long y_samples, cpFloat threshold,
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cpMarchSegmentFunc segment, void *segment_data,
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cpMarchSampleFunc sample, void *sample_data
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);
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