import processing.opengl.*;
import java.util.ArrayList;


		Particle[] pArray;
		private int pNum = 2500;

                PImage[] images;
                int x;
                int y;
                ArrayList galleries;
		PImage img;
		void setup(){

  
    			size (640,480,OPENGL);
			frameRate(30);
                        lights();
                        smooth();
                         galleries = new ArrayList(); 
                        x = mouseX;
                        y = mouseY;
			pArray = new Particle[pNum];

                       // String[] imageList = getFlickrImages("autumn");
                        
                        //images = new PImage [25];
                        
                        //for (int i=0;i<images.length;i++){
                           // images[i] = loadImage(imageList[i]);
                        //}                        
                        
                        // images[0] = loadImage("http://farm3.static.flickr.com/2280/2090086142_211eebe401.jpg?v=0");
                        /*
                        images[1] = loadImage("http://farm3.static.flickr.com/2015/2089301257_d453a5b396.jpg?v=0");
                         images[2] = loadImage("http://farm3.static.flickr.com/2344/2090089780_fdcc9a9e93.jpg?v=0");
                        images[3] = loadImage("http://farm3.static.flickr.com/2403/2090088338_3e1568114c.jpg?v=0");
                        images[4] = loadImage("http://farm3.static.flickr.com/2349/2090092216_bbcf302275.jpg?v=0");
                        images[5] = loadImage("http://farm3.static.flickr.com/2374/2090093210_1ba66c5aba.jpg?v=0");
                        images[6] = loadImage("http://farm3.static.flickr.com/2282/2090091560_7e72c3ae3b.jpg?v=0");
                        images[7] = loadImage("http://farm3.static.flickr.com/2366/2090087728_a41189664b.jpg?v=0");
                        images[8] = loadImage("http://farm3.static.flickr.com/2311/2089303585_151b7eb724.jpg?v=0");
                        images[9] = loadImage("http://farm3.static.flickr.com/2005/2089308471_b9fbff342a.jpg?v=0");
                        images[10] = loadImage("http://farm3.static.flickr.com/2395/2089308373_6693a016c7.jpg?v=0");                        
                        */
                        int xoffset = -250;
                        int cols = 4;
                        int rows = pNum/cols;
			//lights();
			for (int i=0;i<pNum;i++){
                                
				double vRandX = Math.random() * 3;
				double vRandY = Math.random() * 3;
				double vRandZ = Math.random() * 3;

                                float startX = i%cols * 50;
                                float startY = i/cols * 50;
				pArray[i] = new Particle(i, width/2 , height/2, 0,vRandY,0,20,0.001);
			}
		}
		
		public void draw(){
                        background(0);
                        int startX = width/2;
                        int startY = height / 2;
                        
                        pushMatrix();
                        
                        //if(mousePressed){
                          //startX = mouseX;
                          //startY = mouseY;
                        //}
                        
                        translate(startX,startY);                        
  		        for (int i=0;i<pArray.length;i++){
                         
				pArray[i].update();
				//pArray[i].render(images[i%images.length]);
				pArray[i].render();
			}
                        popMatrix();
                        
                        //smooth();
                        //stroke(255);
                        //strokeWeight(4);
                        //noFill();
                        //ellipse(width/2,height/2,100,100);
                        
                        if (frameCount <= 1000) {
                           // saveFrame("circles-####.tif");
                        }
		}
	

	class Particle{
			private static final long serialVersionUID = 1L;
			
			double vx;
			double vy;
			double vz;

			int pSize;
			float x;
			float y;
			float z;
			double phaseInc;
			double phase = 0;
			color col;
                        int index;
                        float t = 0;
                        float timeInc = 0.01;
			Particle(int index,float x, float y, double vx, double vy, double vz, int pSize, double phaseInc){
				this.index = index;
                                this.vx = vx;
				this.vy = vy;
				this.vz = vz;
                                this.x = x;
                                this.y = y;
                                this.z = 0;                               
				this.pSize = pSize;
				this.phaseInc = phaseInc;
                                this.col = color(random(255),0,0,200);
			}
			
			public void update(){
				x += vx + (vx * Math.sin(phase));
				//y += vy + (vy * Math.cos(phase));
				z += vz + (vz * Math.cos(phase));
				updateVelocity();

  
                                /*
                                *  If the particle has left the screen, reset its position and velocity.
                                */
                                if (x > width  || y > height || z > 100){
                                  // x=width/2;
                                   //y=height/2;
                                  // z= 0 ;
                                  // vx = Math.random()*5;
				  // vy = Math.random()*5;
                                  // vz = Math.random()*5;
                                } 
			}
	
			private void updateVelocity() {
				
                                //vx *= 1.01;
				//vy *= 1.01;
				//vz *= 1.01;
				//phase += phaseInc;
                                t+=timeInc;
                                
                                
                               // if (mousePressed){
                               //    t+=timeInc
                               // }
                               if (t < 90){
                                  phase = quadEaseOut((float)t,(float)0,(float)1,(float)90);
                                }
                                if (t>90 || t<0){
                                   timeInc *=  -1;
                                }
			}
			
			public void render(){

                               // p.loadPixels();
				//p.pixels[23] = 0xFFFFFFFF;
				//image(p,x,y);
                                //noStroke();
                                pushMatrix();
                                fill(col);
                                
                               scale((float)phase*(float)phase*index/100);
                               rotateZ(TWO_PI*(0.618 * index)+(float)phase);
                               //translate(x,y,z);
                               
                               translate ((index * (float)phase*50) + 10, (float) (sin((float)phase)*200),0);
                               
                               
                                //ellipse(pSize,pSize,pSize,pSize);
                                //translate(width,height,0);
                                pushMatrix();
                                rotateZ( index/ 5 * +(float)phase);
                                translate(-300,-300,0);
                                rect(0,0,600,600);
                                //ellipse(0,0,600,600);
                                //image(img,pSize,pSize);
                                
                                popMatrix();
                                popMatrix();
			}
		}
        /*
        * 
        *    It's the penner bounce function!
        * 
        */
	public float bounceEaseOut (float t, float b, float c, float d) {
		if ((t/=d) < (1/2.75)) {
			return c*(7.5625*t*t) + b;
		} else if (t < (2/2.75)) {
			return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
		} else if (t < (2.5/2.75)) {
			return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
		} else {
			return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
		}
	}

        public float quadEaseIn (float t,float b,float c,float d) {
			return c*(t/=d)*t + b;
		}
	public float quadEaseOut (float t, float b,float c,float d){
			return -c *(t/=d)*(t-2) + b;
	}