import processing.core.PApplet;
import processing.core.PImage;

public class Fire {

	PApplet parent;

	String textureDirectory = "";

	ParticleSystem ps;
	PImage[] textures = new PImage[4];

	Vector3D origin;
	Vector3D gravity = new Vector3D(0, -0.179F, 0);

	int numParticles = 200;
	int newParticlesPerStep = 15;

	public Fire(PApplet parent, Vector3D o, String textureDirectory) {

		this.parent = parent;
		this.textureDirectory = textureDirectory;
		this.origin = o.copy();

		makeFireTextures();

		ps = new ParticleSystem(parent, numParticles, origin, textures);
	}

	public void step() {

		// add gravity
		ps.add_force(gravity);

		// step the particle system
		ps.step();

		// add some more particles
		for (int i = 0; i < newParticlesPerStep; i++) {
			ps.addParticle();
		}

	}

	private void makeFireTextures() {
		// Create an alpha masked image to be applied as the particle's texture
		PImage msk1 = parent.loadImage(textureDirectory + "fire_1.gif");
		PImage msk2 = parent.loadImage(textureDirectory + "fire_2.gif");
		PImage msk3 = parent.loadImage(textureDirectory + "fire_3.gif");
		PImage msk4 = parent.loadImage(textureDirectory + "smoke.bmp");

		PImage img1 = new PImage(msk1.width, msk1.height);
		for (int i = 0; i < img1.pixels.length; i++)
			img1.pixels[i] = parent.color(255);
		img1.mask(msk1);

		PImage img2 = new PImage(msk2.width, msk2.height);
		for (int i = 0; i < img2.pixels.length; i++)
			img2.pixels[i] = parent.color(255);
		img2.mask(msk2);

		PImage img3 = new PImage(msk3.width, msk3.height);
		for (int i = 0; i < img3.pixels.length; i++)
			img3.pixels[i] = parent.color(255);
		img3.mask(msk3);

		PImage img4 = new PImage(msk4.width, msk4.height);
		for (int i = 0; i < img4.pixels.length; i++)
			img4.pixels[i] = parent.color(255);
		img4.mask(msk4);

		textures[0] = img1;
		textures[1] = img2;
		textures[2] = img3;
		textures[3] = img4;

	}

	public Vector3D getOrigin() {
		return origin;
	}

	public void setOrigin(Vector3D origin) {
		this.origin = origin;
	}

	public Vector3D getGravity() {
		return gravity;
	}

	public void setGravity(Vector3D gravity) {
		this.gravity = gravity;
	}

	public int getNumParticles() {
		return numParticles;
	}

	public void setNumParticles(int numParticles) {
		this.numParticles = numParticles;
	}

}