SimpleFireEmitter.java

/**
 * Copyright 2008 - 2012
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 * 
 * @project loon
 * @author cping
 * @email：javachenpeng@yahoo.com
 * @version 0.3.3
 */
package loon.particle;

import loon.LTexture;
import loon.utils.MathUtils;

public class SimpleFireEmitter implements SimpleEmitter {
	
	private int _x;

	private int _y;
	
	private int _interval = 50;

	private long _timer;

	private float _size = 40;
	
	public SimpleFireEmitter() {
	}

	public SimpleFireEmitter(int x, int y) {
		this._x = x;
		this._y = y;
	}

	public SimpleFireEmitter(int x, int y, float size) {
		this._x = x;
		this._y = y;
		this._size = size;
	}
	
	@Override
	public void update(SimpleParticleSystem system, long delta) {
		_timer -= delta;
		if (_timer <= 0) {
			_timer = _interval;
			SimpleParticle p = system.getNewParticle(this, 1000);
			p.setColor(1, 1, 1, 0.5f);
			p.setPosition(_x, _y);
			p.setSize(_size);
			float vx =  (-0.02f + (MathUtils.random() * 0.04f));
			float vy =  (-(MathUtils.random() * 0.15f));
			p.setVelocity(vx,vy,1.1f);
		}
	}

	@Override
	public void updateParticle(SimpleParticle particle, long delta) {
		if (particle.getLife() > 600) {
			particle.adjustSize(0.07f * delta);
		} else {
			particle.adjustSize(-0.04f * delta * (_size / 40.0f));
		}
		float c = 0.002f * delta;
		particle.adjustColor(0,-c/2,-c*2,-c/4);
	}

	@Override
	public boolean isEnabled() {
		return true;
	}

	@Override
	public void setEnabled(boolean enabled) {
	}

	@Override
	public boolean completed() {
		return false;
	}

	@Override
	public boolean useAdditive() {
		return false;
	}

	@Override
	public LTexture getImage() {
		return null;
	}

	@Override
	public boolean usePoints(SimpleParticleSystem system) {
		return false;
	}

	@Override
	public boolean isOriented() {
		return false;
	}

	@Override
	public void up() {
	}

	@Override
	public void resetState() {
	}
}