Point2F Mover::CalculateDrag(float dragMag)
{
//F drag=-v*v*dragMag
Point2F drag = -mVelocity;
drag.Normalize();
drag *= dragMag;
drag *= mVelocity.LengthSquared();
return drag;
}
Point2F Mover::CalculateAttract(const Mover& other, float g, float minDistanceSquared/*=1.f*/)
{
//F=G*m1*m2/(r*r)
Point2F force = mPosition - other.mPosition;
float distanceSquared =Math::Max(force.LengthSquared(),minDistanceSquared);
force.Normalize();
force *= g*mMass*other.mMass;
force /= distanceSquared;
return force;
}
Point2F Mover::CalculateFriction(float frictionMag, const Point2F& gravity)
{
//Friction=-frictionMag*N*v
//v==mVelocity.Normalize()
Point2F friction = -mVelocity;
friction.Normalize();
friction *= frictionMag;
friction *= mMass*gravity;
return friction;
}