Particle.java

package elec0.particleEngine;

import static org.lwjgl.opengl.GL11.*;

import java.util.Random;

import org.newdawn.slick.Color;

import elec0.utils.Timing;
import elec0.utils.Vector3f;

public class Particle
{
	// Everything can be public because this class shouldn't ever be used outside of a ParticleEmitter, which might need to change things after initilization
	public  Vector3f position, moveVector;
	public float speed, lifetime;
	public Color startcolor1, startcolor2, startcolor3; // Starting and ending colors, transition through life of particle
	public Color endcolor1, endcolor2, endcolor3;
	public long birthTime;
	public String behavior;

	private Behaviors enumBehaviors;
	public float size = 1;

	// Constructors
	Particle(Vector3f position)
	{
		this.position = position;
		this.birthTime = Timing.getTime();
		this.behavior = "default";
//		this.position.setY(size);
		initParticle();
	}
	Particle(Vector3f position, Color startcolor1)
	{
		this.position = position;
		this.startcolor1 = startcolor1;
		this.birthTime = Timing.getTime();
		this.behavior = "default";
//		this.position.setY(size);
		initParticle();
	}
	Particle(Vector3f position, Color startcolor1, String behavior)
	{
//		this.position = new Vector3f(0, 0, 0);
		this.position = position;
		this.startcolor1 = startcolor1;
		this.birthTime = Timing.getTime();
		this.behavior = behavior;
//		this.position.setY(size);
		initParticle();
	}
	// End constructors

	private void initParticle()
	{
		Random random = new Random();
		enumBehaviors = Behaviors.valueOf(behavior.toUpperCase());

		switch(enumBehaviors)
		{
		case FIRE: // Uses three colors

			break;

		case DIAMOND: // Default (atm) with diamonds instead of squares and no texture

			// Get a random spread and direction
			float diSpread =(float)(random.nextInt(100))/200.0f;
			float diAngle =(float)(random.nextInt(157))/10.0f; // Quarter circle

			float dixMove = (float)(Math.cos(diAngle)*diSpread)/5;
			float diyMove = (float)(Math.sin(diAngle)*diSpread)/5;
		    // Calculate X and Z vectors
		    moveVector = new Vector3f(dixMove, 0, diyMove);

		    // Get a random initial speed
		    moveVector.setY(random.nextInt(500)/1000f);

		    // Get a random life and 'yellowness'
		    lifetime = random.nextFloat()*10000;
			break;

		case DEFAULT: // Uses one color, random spread and speed, affected by gravity, lifespan 1-10 seconds

			// Get a random spread and direction
			float dSpread=(float)(random.nextInt(100))/200.0f;
			float dAngle=(float)(random.nextInt(157))/10.0f; // Quarter circle

			float dxMove = (float)(Math.cos(dAngle)*dSpread)/5;
			float dyMove = (float)(Math.sin(dAngle)*dSpread)/5;
		    // Calculate X and Z vectors
		    moveVector = new Vector3f(dxMove, 0, dyMove);

		    // Get a random initial speed
		    moveVector.setY(random.nextInt(500)/1000f);

		    // Get a random life and 'yellowness'
		    lifetime = random.nextFloat()*10000;

		    break;
		}
	}

	// Pass this any non-null Colors you want it to change the internal variables for
	public void setColors(Color sc1, Color sc2, Color sc3, Color ec1, Color ec2, Color ec3)
	{
		if(sc1 != null)
			startcolor1 = sc1;
		if(sc2 != null)
			startcolor2 = sc2;
		if(sc3 != null)
			startcolor3 = sc3;

		if(ec1 != null)
			endcolor1 = ec1;
		if(ec2 != null)
			endcolor2 = ec2;
		if(ec3 != null)
			endcolor3 = ec3;
	}

	public void draw()
	{
	    glPushMatrix();

	    switch(enumBehaviors)
	    {
	    case DIAMOND:
		    glColor4f(startcolor1.r, startcolor1.g, startcolor1.b, startcolor1.a); // Color the particle

		    glDisable(GL_TEXTURE_2D);

		    // Place the quad and rotate to face the viewer
		    glTranslatef(position.getX(), position.getY(), position.getZ());

		    //glRotatef(-ViewYaw,0.0f,1.0f,0.0f);
		    //glRotatef(-ViewPitch,1.0f,0.0f,0.0f);

		    glBegin(GL_QUADS);
		    	glTexCoord2f(1.0f,0.0f); glVertex3f(0, 0, 0.0f);
			    glTexCoord2f(0.0f,0.0f); glVertex3f(-size/2, size/2, 0.0f);
			    glTexCoord2f(0.0f,1.0f); glVertex3f(0, size, 0.0f);
			    glTexCoord2f(1.0f,1.0f); glVertex3f(size/2, size/2, 0.0f);
		    glEnd();

	    	break;
	    case DEFAULT:
		    glColor4f(startcolor1.r, startcolor1.g, startcolor1.b, startcolor1.a); // Color the particle

		    glEnable(GL_TEXTURE_2D);

		    // Place the quad and rotate to face the viewer
		    glTranslatef(position.getX(), position.getY(), position.getZ());

		    //glRotatef(-ViewYaw,0.0f,1.0f,0.0f);
		    //glRotatef(-ViewPitch,1.0f,0.0f,0.0f);

		    glBegin(GL_QUADS);
		    	glTexCoord2f(1.0f,0.0f); glVertex3f(size, size,0.0f);
			    glTexCoord2f(0.0f,0.0f); glVertex3f(-size, size,0.0f);
			    glTexCoord2f(0.0f,1.0f); glVertex3f(-size,-size,0.0f);
			    glTexCoord2f(1.0f,1.0f); glVertex3f(size,-size,0.0f);
		    glEnd();
	    	break;
	    }


	    glPopMatrix();
	}


	private enum Behaviors
	{
		DEFAULT,
		FIRE,
		DIAMOND,
		SQUARE
	}
}