Misc

Defines
#define	CP_BUFFER_BYTES   (32*1024)
	Allocated size for various Chipmunk buffers.
#define	cpcalloc   calloc
	Chipmunk calloc() alias.
#define	cprealloc   realloc
	Chipmunk realloc() alias.
#define	cpfree   free
	Chipmunk free() alias.
Functions
void	cpInitChipmunk (void)
cpFloat	cpMomentForCircle (cpFloat m, cpFloat r1, cpFloat r2, cpVect offset)
	Calculate the moment of inertia for a circle.
cpFloat	cpAreaForCircle (cpFloat r1, cpFloat r2)
	Calculate area of a hollow circle.
cpFloat	cpMomentForSegment (cpFloat m, cpVect a, cpVect b)
	Calculate the moment of inertia for a line segment.
cpFloat	cpAreaForSegment (cpVect a, cpVect b, cpFloat r)
	Calculate the area of a fattened (capsule shaped) line segment.
cpFloat	cpMomentForPoly (cpFloat m, int numVerts, const cpVect *verts, cpVect offset)
	Calculate the moment of inertia for a solid polygon shape assuming it's center of gravity is at it's centroid. The offset is added to each vertex.
cpFloat	cpAreaForPoly (const int numVerts, const cpVect *verts)
	Calculate the signed area of a polygon.
cpVect	cpCentroidForPoly (const int numVerts, const cpVect *verts)
	Calculate the natural centroid of a polygon.
void	cpRecenterPoly (const int numVerts, cpVect *verts)
	Center the polygon on the origin. (Subtracts the centroid of the polygon from each vertex).
cpFloat	cpMomentForBox (cpFloat m, cpFloat width, cpFloat height)
	Calculate the moment of inertia for a solid box.
cpFloat	cpMomentForBox2 (cpFloat m, cpBB box)
	Calculate the moment of inertia for a solid box.
Variables
const char *	cpVersionString
	Version string.

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Function Documentation

cpFloat cpAreaForCircle	(	cpFloat	r1,
		cpFloat	r2
	)

Calculate area of a hollow circle.

r1 and r2 are the inner and outer diameters. A solid circle has an inner diameter of 0.

cpFloat cpAreaForPoly	(	const int	numVerts,
		const cpVect *	verts
	)

Calculate the signed area of a polygon.

A Clockwise winding gives positive area. This is probably backwards from what you expect, but matches Chipmunk's the winding for poly shapes.

void cpInitChipmunk

(

void

)

Deprecated:

cpFloat cpMomentForCircle	(	cpFloat	m,
		cpFloat	r1,
		cpFloat	r2,
		cpVect	offset
	)

Calculate the moment of inertia for a circle.

r1 and r2 are the inner and outer diameters. A solid circle has an inner diameter of 0.

cpFloat cpMomentForSegment	(	cpFloat	m,
		cpVect	a,
		cpVect	b
	)

Calculate the moment of inertia for a line segment.

Beveling radius is not supported.