Rename extlibs to thirdparty

thirdparty/include/chipmunk/cpPolyline.h

@@ -0,0 +1,70 @@
+// Copyright 2013 Howling Moon Software. All rights reserved.
+// See http://chipmunk2d.net/legal.php for more information.
+
+// Polylines are just arrays of vertexes.
+// They are looped if the first vertex is equal to the last.
+// cpPolyline structs are intended to be passed by value and destroyed when you are done with them.
+typedef struct cpPolyline {
+  int count, capacity;
+  cpVect verts[];
+} cpPolyline;
+
+/// Destroy and free a polyline instance.
+CP_EXPORT void cpPolylineFree(cpPolyline *line);
+
+/// Returns true if the first vertex is equal to the last.
+CP_EXPORT cpBool cpPolylineIsClosed(cpPolyline *line);
+
+/**
+	Returns a copy of a polyline simplified by using the Douglas-Peucker algorithm.
+	This works very well on smooth or gently curved shapes, but not well on straight edged or angular shapes.
+*/
+CP_EXPORT cpPolyline *cpPolylineSimplifyCurves(cpPolyline *line, cpFloat tol);
+
+/**
+	Returns a copy of a polyline simplified by discarding "flat" vertexes.
+	This works well on straigt edged or angular shapes, not as well on smooth shapes.
+*/
+CP_EXPORT cpPolyline *cpPolylineSimplifyVertexes(cpPolyline *line, cpFloat tol);
+
+/// Get the convex hull of a polyline as a looped polyline.
+CP_EXPORT cpPolyline *cpPolylineToConvexHull(cpPolyline *line, cpFloat tol);
+
+
+/// Polyline sets are collections of polylines, generally built by cpMarchSoft() or cpMarchHard().
+typedef struct cpPolylineSet {
+  int count, capacity;
+  cpPolyline **lines;
+} cpPolylineSet;
+
+/// Allocate a new polyline set.
+CP_EXPORT cpPolylineSet *cpPolylineSetAlloc(void);
+
+/// Initialize a new polyline set.
+CP_EXPORT cpPolylineSet *cpPolylineSetInit(cpPolylineSet *set);
+
+/// Allocate and initialize a polyline set.
+CP_EXPORT cpPolylineSet *cpPolylineSetNew(void);
+
+/// Destroy a polyline set.
+CP_EXPORT void cpPolylineSetDestroy(cpPolylineSet *set, cpBool freePolylines);
+
+/// Destroy and free a polyline set.
+CP_EXPORT void cpPolylineSetFree(cpPolylineSet *set, cpBool freePolylines);
+
+/**
+	Add a line segment to a polyline set.
+	A segment will either start a new polyline, join two others, or add to or loop an existing polyline.
+	This is mostly intended to be used as a callback directly from cpMarchSoft() or cpMarchHard().
+*/
+CP_EXPORT void cpPolylineSetCollectSegment(cpVect v0, cpVect v1, cpPolylineSet *lines);
+
+/**
+	Get an approximate convex decomposition from a polyline.
+	Returns a cpPolylineSet of convex hulls that match the original shape to within 'tol'.
+	NOTE: If the input is a self intersecting polygon, the output might end up overly simplified.
+*/
+
+CP_EXPORT cpPolylineSet *cpPolylineConvexDecomposition(cpPolyline *line, cpFloat tol);
+
+#define cpPolylineConvexDecomposition_BETA cpPolylineConvexDecomposition