void PhysicsShapePolygon::updateScale()
{
cpFloat factorX = _newScaleX / _scaleX;
cpFloat factorY = _newScaleY / _scaleY;
auto shape = _cpShapes.front();
int count = cpPolyShapeGetCount(shape);
cpVect* vects = new cpVect[count];
for(int i=0;i<count;++i)
vects[i] = cpPolyShapeGetVert(shape, i);
for (int i = 0; i < count; ++i)
{
vects[i].x *= factorX;
vects[i].y *= factorY;
}
// convert hole to clockwise
if (factorX * factorY < 0)
{
for (int i = 0; i < count / 2; ++i)
{
cpVect v = vects[i];
vects[i] = vects[count - i - 1];
vects[count - i - 1] = v;
}
}
cpPolyShapeSetVertsRaw(shape, count, vects);
CC_SAFE_DELETE_ARRAY(vects);
PhysicsShape::updateScale();
}
void
cpPolyShapeSetVerts(cpShape *shape, int count, cpVect *verts, cpTransform transform)
{
cpVect *hullVerts = (cpVect *)alloca(count*sizeof(cpVect));
// Transform the verts before building the hull in case of a negative scale.
for(int i=0; i<count; i++) hullVerts[i] = cpTransformPoint(transform, verts[i]);
unsigned int hullCount = cpConvexHull(count, hullVerts, hullVerts, NULL, 0.0);
cpPolyShapeSetVertsRaw(shape, hullCount, hullVerts);
}