Polygon::Polygon(ShapePolygon *src, float mass){
std::vector<glm::vec2> ofVerts = src->getPoints();
std::vector<cpVect> verts = toChipmunk(ofVerts);
cpFloat moment = cpMomentForPoly(mass, verts.size(), verts.data(), cpvzero, cpPolyShapeGetRadius(src->shape));
DynamicBody::setup(cpShapeGetSpace(src->shape), mass, moment);
cpSpaceRemoveShape(cpShapeGetSpace(src->shape), src->shape);
ShapePolygon::setup(src);
cpShapeSetBody(shape, body);
cpSpaceAddShape(cpBodyGetSpace(body), shape);
}
float PhysicsShapePolygon::calculateArea()
{
auto shape = _cpShapes.front();
int count = cpPolyShapeGetCount(shape);
cpVect* vecs = new cpVect[count];
for(int i=0;i<count;++i)
vecs[i] = cpPolyShapeGetVert(shape, i);
float area = PhysicsHelper::cpfloat2float(cpAreaForPoly(count, vecs, cpPolyShapeGetRadius(shape)));
CC_SAFE_DELETE_ARRAY(vecs);
return area;
}
float PhysicsShapePolygon::calculateDefaultMoment()
{
if(_mass == PHYSICS_INFINITY)
{
return PHYSICS_INFINITY;
}
else
{
auto shape = _cpShapes.front();
int count = cpPolyShapeGetCount(shape);
cpVect* vecs = new cpVect[count];
for(int i=0;i<count;++i)
vecs[i] = cpPolyShapeGetVert(shape, i);
float moment = PhysicsHelper::cpfloat2float(cpMomentForPoly(_mass, count, vecs, cpvzero, cpPolyShapeGetRadius(shape)));
CC_SAFE_DELETE_ARRAY(vecs);
return moment;
}
}
