LinearMotion.java

package it.marteEngine.tween;

import org.newdawn.slick.geom.Vector2f;

public class LinearMotion extends Motion {

	private float fromX;
	private float fromY;
	private float toX;
	private float toY;
	private float moveX;
	private float moveY;
	private float speed = 1.0f;
	private float distance = -1f;

	public LinearMotion(float fromX, float fromY, float toX, float toY,
			float duration, int easeFunction) {
		this(fromX, fromY, toX, toY, 1.0f, TweenerMode.ONESHOT, duration,
				easeFunction);
	}

	public LinearMotion(float fromX, float fromY, float toX, float toY,
			float speed, float duration, int easeFunction) {
		this(fromX, fromY, toX, toY, speed, TweenerMode.ONESHOT, duration,
				easeFunction);
	}

	public LinearMotion(float fromX, float fromY, float toX, float toY,
			float speed, TweenerMode type, float duration, int easeFunction) {
		this(fromX, fromY, toX, toY, speed, type, duration, easeFunction, false);
	}

	public LinearMotion(float fromX, float fromY, float toX, float toY,
			float speed, TweenerMode type, float duration, int easeFunction,
			boolean deltaMode) {
		super(duration, type, easeFunction, false, true);
		this.distance = -1f;
		this.x = this.fromX = fromX;
		this.y = this.fromY = fromY;
		this.toX = toX;
		this.toY = toY;
		this.moveX = toX - fromX;
		this.moveY = toY - fromY;
		this.speed = speed;
		this.target = duration / speed;
		this.deltaTiming = deltaMode;
		this.easingFunction = easeFunction;
		this.mode = type;
		this.start();
	}

	public void update(int delta) {
		super.update(delta);
		x = fromX + moveX * t;
		y = fromY + moveY * t;
	}

}