Point.java

package openmods.physics;

public class Point {

	private FastVector current, previous, force;
	double mass, inv_mass;

	public Point(double x, double y, double z) {
		this.current = this.previous = new FastVector(x, y, z);
		this.mass = this.inv_mass = 1;
		this.force = new FastVector(0.0, -0.5, 0).multiply(0.05 * 0.05);
	}

	public void setCurrent(FastVector v) {
		this.current = v;
	}

	public void setPrevious(FastVector v) {
		this.previous = v;
	}

	public FastVector getCurrent() {
		return this.current;
	}

	public FastVector getPrevious() {
		return this.previous;
	}

	public void update() {
		if (this.inv_mass != 0) {
			FastVector new_pos = this.current.multiply(1.99).subtract(this.previous.multiply(0.99)).add(this.force);
			new_pos.x = (new_pos.x < 0)? 0 : ((new_pos.x > 1)? 1 : new_pos.x);
			new_pos.y = (new_pos.y < 0)? 0 : ((new_pos.y > 1)? 1 : new_pos.y);
			new_pos.z = (new_pos.z < 0)? 0 : ((new_pos.z > 1)? 1 : new_pos.z);
			this.previous = this.current;
			this.current = new_pos;
		}
	}
}