Flame.pde

public class Flame{
	public int x = 0;
	public int y = 0;
	int startTime;
	int showingImg_num;
	public Flame (int x, int y) {
		this.x = x;
		this.y = y;
		this.showingImg_num = 0;
		this.startTime = millis();
	}

	public int getCurrentImg() {
		if (millis() - this.startTime > 100) {
			return this.showingImg_num++;
		}
		else
		{
			return this.showingImg_num;
		}
	}
}

public class FlameMgr{
	ArrayList<Flame> flames = new ArrayList<Flame>(0);
	PImage flame1;
	PImage flame2;
	PImage flame3;
	PImage flame4;
	PImage flame5;

	public FlameMgr() {
		flame1 = loadImage("img/flame1.png");
		flame2 = loadImage("img/flame2.png");
		flame3 = loadImage("img/flame3.png");
		flame4 = loadImage("img/flame4.png");
		flame5 = loadImage("img/flame5.png");
	}

	void addFlame(int x, int y)
	{
		flames.add(new Flame(x, y));
	}

	public void draw() {
		ArrayList<Flame> flamesToRemove = new ArrayList<Flame>(0);
		for (int i = 0; i < this.flames.size(); ++i) {
			Flame flame = this.flames.get(i);
			int num = flame.getCurrentImg();
			switch (num) {
				case 0:	
					image(this.flame1, flame.x, flame.y);
					break;
				case 1:	
					image(this.flame2, flame.x, flame.y);
					break;
				case 2:	
					image(this.flame3, flame.x, flame.y);
					break;
				case 3:	
					image(this.flame4, flame.x, flame.y);
					break;
				case 4:	
					image(this.flame5, flame.x, flame.y);
					break;
				case 5:
					flamesToRemove.add(flame);
					break;	

			}
		}

		for (int i = 0; i < flamesToRemove.size(); ++i) {
			flames.remove(flamesToRemove.get(i));
		}
	}

}