// Function to update location
public void update() {
// As long as we aren't dragging the pendulum, let it swing!
if (!dragging) {
float G = 0.4f; // Arbitrary universal gravitational constant
theta_acc = (-1 * G / r) * sin(theta); // Calculate acceleration (see:
// http://www.myphysicslab.com/pendulum1.html)
theta_vel += theta_acc; // Increment velocity
theta_vel *= damping; // Arbitrary damping
theta += theta_vel; // Increment theta
}
loc.setXY(r * sin(theta), r * cos(theta)); // Polar to cartesian conversion
loc.add(origin); // Make sure the location is relative to the pendulum's origin
}
