Add cpShapeIsPoly, cpShapeIsSegment, cpShapeIsCircle functions

include/chipmunk/cpPolyShape.h

@@ -53,4 +53,7 @@ CP_EXPORT cpVect cpPolyShapeGetVert(const cpShape *shape, int index);
 /// Get the radius of a polygon shape.
 CP_EXPORT cpFloat cpPolyShapeGetRadius(const cpShape *shape);
 
+/// Query if shape is a polygon shape.
+CP_EXPORT cpBool cpShapeIsPoly(const cpShape *shape);
+
 /// @}

include/chipmunk/cpShape.h

@@ -174,6 +174,9 @@ CP_EXPORT cpVect cpCircleShapeGetOffset(const cpShape *shape);
 /// Get the radius of a circle shape.
 CP_EXPORT cpFloat cpCircleShapeGetRadius(const cpShape *shape);
 
+/// Query if shape is a polygon shape.
+CP_EXPORT cpBool cpShapeIsCircle(const cpShape *shape);
+
 /// @}
 /// @defgroup cpSegmentShape cpSegmentShape
 
@@ -196,4 +199,7 @@ CP_EXPORT cpVect cpSegmentShapeGetNormal(const cpShape *shape);
 /// Get the first endpoint of a segment shape.
 CP_EXPORT cpFloat cpSegmentShapeGetRadius(const cpShape *shape);
 
+/// Query if shape is a segment shape.
+CP_EXPORT cpBool cpShapeIsSegment(const cpShape *shape);
+
 /// @}

src/cpPolyShape.c

@@ -322,3 +322,9 @@ cpPolyShapeSetRadius(cpShape *shape, cpFloat radius)
 //	shape->massInfo = cpPolyShapeMassInfo(shape->massInfo.m, poly->count, poly->verts, poly->r);
 //	if(mass > 0.0f) cpBodyAccumulateMassFromShapes(shape->body);
 }
+
+cpBool
+cpShapeIsPoly(const cpShape *shape)
+{
+	return shape->klass == &polyClass;
+}

src/cpShape.c

@@ -368,6 +368,11 @@ cpCircleShapeGetRadius(const cpShape *shape)
 	return ((cpCircleShape *)shape)->r;
 }
 
+cpBool
+cpShapeIsCircle(const cpShape *shape)
+{
+	return shape->klass == &cpCircleShapeClass;
+}
 
 cpSegmentShape *
 cpSegmentShapeAlloc(void)
@@ -602,3 +607,9 @@ cpSegmentShapeSetRadius(cpShape *shape, cpFloat radius)
 	shape->massInfo = cpSegmentShapeMassInfo(shape->massInfo.m, seg->a, seg->b, seg->r);
 	if(mass > 0.0f) cpBodyAccumulateMassFromShapes(shape->body);
 }
+
+cpBool
+cpShapeIsSegment(const cpShape *shape)
+{
+	return shape->klass == &cpSegmentShapeClass;
+}