void dummy() { }
	
	static final class Stroke {
		public float x,y;
		
		public int ttl=50;
		public int col;
		public float[] points;
	}
	
	static Stroke[] strokes;
	
	static float[] camera=new float[]{0,200,200, 1f,0,0, 0,1,0, 0,0,1};
	
	static Random rand=new Random();
	public final void setup() {
		size(800, 500, P2D);
		strokes=new Stroke[500];
		for (int i=0;i<strokes.length;i++) {
			Stroke stroke = new Stroke();
			init_stroke(stroke);
			strokes[i]=stroke;
		}
		frameRate(25);
	}

	private void init_stroke(Stroke stroke) {
		stroke.x=rand.nextInt(width);
		stroke.y=rand.nextInt(height)*rand.nextInt(height)/height;
		stroke.ttl=rand.nextInt(50)+50;
		int col = rand.nextInt(64)+128;
		stroke.col=col+(col-rand.nextInt(32)<<8)+(col-rand.nextInt(16)<<16);
	}
	
	public final void update() {

		for (int i=0;i<strokes.length;i++) {
			Stroke stroke=strokes[i];
			if (--stroke.ttl <= 0) {
				init_stroke(stroke);
			}
			else {
				int opa=(stroke.col&0xff000000)>>>24;
				if (stroke.ttl>50) {
					opa=Math.min(255, opa+10);
				}
				else {
					opa=Math.max(0,opa-3);
				}
				stroke.col=(stroke.col&0xffffff)+(opa<<24);
			}
		}
	}

	final static int focus=512;
	public final void draw() {
		update();
		noStroke();
		background(0x00334499);
		for (int i=0;i<strokes.length;i++) {
			Stroke stroke=strokes[i];
			float x=stroke.x;
			float y=stroke.y;
//			float z=0;
//			float cwx = x-camera[0];
//            float cwy = y-camera[1];
//            float cwz = z-camera[2];
//            float cx = cwx*camera[ 3] + cwy*camera[ 4] + cwz*camera[ 5];
//            float cy = cwx*camera[ 6] + cwy*camera[ 7] + cwz*camera[ 8];
//            float cz = cwx*camera[ 9] + cwy*camera[10] + cwz*camera[11];
			
			float wid=120f*(y/height);
			float strwid=wid/12f;
			float x0=x-wid;
			float y0=y;
			float x1=x;
			float stren = (1-sin(stroke.ttl/16f))*strwid;
			float y1=y+stren+strwid;
			float x2=x;
			float y2=y+stren-strwid;
			float x3=x+wid;
			float y3=y;
			
			fill(stroke.col);
			triangle(x0,y0,x1,y1,x2,y2);
			triangle(x1,y1,x2,y2,x3,y3);
		}
	}