void Sprite::Update( float px, float py ) {
Timer *timer = Timer::Instance();
Trig *trig = Trig::Instance();
Camera *camera = Camera::Instance();
float a;
int sx, sy;
vector2D accel;
/* -= the arcade way to do it =-
a = (throttle * thrust) / mass;
x += cos( ang ) * a * timer->GetMultiplier();
y -= sin( ang ) * a * timer->GetMultiplier();
*/
a = (throttle * thrust) / mass;
accel.Set( cos( ang ) * a, -sin( ang ) * a );
velocity = velocity + (accel * timer->GetMultiplier());
x += velocity.GetX();
y += velocity.GetY();
trig->RotatePoint( x, y, px, py, &rx, &ry, camera->GetAngle() );
camera->WorldtoScreen( rx, ry, &sx, &sy );
this->sx = sx;
this->sy = sy;
}
