static int l_physics_getShapeFriction(lua_State* state)
{
l_physics_Shape* shape = (l_physics_Shape*)lua_touserdata(state, 1);
lua_pushnumber(state, cpShapeGetFriction(shape->shape));
return 1;
}
void Slice::ClipPoly(cpSpace *space, cpShape *shape, cpVect n, cpFloat dist)
{
cpBody *body = cpShapeGetBody(shape);
int count = cpPolyShapeGetCount(shape);
int clippedCount = 0;
cpVect *clipped = (cpVect *)alloca((count + 1)*sizeof(cpVect));
for(int i=0, j=count-1; i<count; j=i, i++){
cpVect a = cpBodyLocalToWorld(body, cpPolyShapeGetVert(shape, j));
cpFloat a_dist = cpvdot(a, n) - dist;
if(a_dist < 0.0){
clipped[clippedCount] = a;
clippedCount++;
}
cpVect b = cpBodyLocalToWorld(body, cpPolyShapeGetVert(shape, i));
cpFloat b_dist = cpvdot(b, n) - dist;
if(a_dist*b_dist < 0.0f){
cpFloat t = cpfabs(a_dist)/(cpfabs(a_dist) + cpfabs(b_dist));
clipped[clippedCount] = cpvlerp(a, b, t);
clippedCount++;
}
}
cpVect centroid = cpCentroidForPoly(clippedCount, clipped);
cpFloat mass = cpAreaForPoly(clippedCount, clipped, 0.0f)*DENSITY;
cpFloat moment = cpMomentForPoly(mass, clippedCount, clipped, cpvneg(centroid), 0.0f);
cpBody *new_body = cpSpaceAddBody(space, cpBodyNew(mass, moment));
cpBodySetPosition(new_body, centroid);
cpBodySetVelocity(new_body, cpBodyGetVelocityAtWorldPoint(body, centroid));
cpBodySetAngularVelocity(new_body, cpBodyGetAngularVelocity(body));
cpTransform transform = cpTransformTranslate(cpvneg(centroid));
cpShape *new_shape = cpSpaceAddShape(space, cpPolyShapeNew(new_body, clippedCount, clipped, transform, 0.0));
// Copy whatever properties you have set on the original shape that are important
cpShapeSetFriction(new_shape, cpShapeGetFriction(shape));
}
float CCPhysicsShape::getFriction(void)
{
return cpShapeGetFriction(m_shape);
}
void RigidBody2D::CopyShapeData(cpShape* from, cpShape* to)
{
cpShapeSetElasticity(to, cpShapeGetElasticity(from));
cpShapeSetFriction(to, cpShapeGetFriction(from));
cpShapeSetSurfaceVelocity(to, cpShapeGetSurfaceVelocity(from));
}
float Nz::RigidBody2D::GetFriction(std::size_t shapeIndex) const
{
assert(shapeIndex < m_shapes.size());
return float(cpShapeGetFriction(m_shapes[shapeIndex]));
}
GLMFloat worldShape_friction(WorldShape_t *aEntity)
{
return cpShapeGetFriction(aEntity->cpShape);
}
cpFloat shape::friction( void ) { return cpShapeGetFriction( this->m_shape ); }
