void PhysicalObj::ContactPointAngleOnGround(const Point2d& oldPos,
Point2d& contactPos,
Double& contactAngle) const
{
// Find the contact point and collision angle.
// !!! ContactPoint(...) _can_ return false when CollisionTest(...) is true !!!
// !!! WeaponProjectiles collide on objects, so computing the tangeante to the ground leads
// !!! uninitialised values of cx and cy!!
// if( ContactPoint(cx, cy) ){
int cx, cy;
if (ContactPoint(cx, cy)) {
contactAngle = GetWorld().ground.Tangent(cx, cy);
if (!isNaN(contactAngle)) {
contactPos.x = (Double)cx * METER_PER_PIXEL;
contactPos.y = (Double)cy * METER_PER_PIXEL;
} else {
contactAngle = - GetSpeedAngle();
contactPos = oldPos;
}
} else {
contactAngle = - GetSpeedAngle();
contactPos = oldPos;
}
}
void PhysicsSimulation::updateContacts() {
PerformanceTimer perfTimer("contacts");
int numCollisions = _collisions.size();
for (int i = 0; i < numCollisions; ++i) {
CollisionInfo* collision = _collisions.getCollision(i);
quint64 key = collision->getShapePairKey();
if (key == 0) {
continue;
}
QMap<quint64, ContactPoint>::iterator itr = _contacts.find(key);
if (itr == _contacts.end()) {
_contacts.insert(key, ContactPoint(*collision, _frameCount));
} else {
itr.value().updateContact(*collision, _frameCount);
}
}
}
