/*

   Structure 2

   A grid of points in the top half of the surface.
   Each point moves downward and returns to the top when it falls off the
   bottom edge. Beginning in the upper-left, each row and column moves
   faster than the previous one. The speeds combine so that the point in the
   upper-left is the slowest and the point in the lower-right is the
   fastest. Copy and flip the grid across a central vertical axis and
   display simultaneously.

   Implemented by Casey Reas <http://groupc.net>
   16 April 2004
   Processing v.68 <http://processing.org>

*/

Pixel[] pix;

void setup()
{
  size(800, 600);
  pix = new Pixel[width/10 * height/20];
  framerate(30);

  for(int i=0; i<width/10; i++) {
    for(int j=0; j<height/20; j++) {
      pix[i*(height/20)+j] = new Pixel(i*10, j*10, i/100.0*j/100 * 8.0, true);
    }
  }
}

void loop()
{
  background(0);
  for(int i=height/10; i<(height/20 * width/10); i++) {
    pix[i].update();
    pix[i].display();
  }
}

class Pixel
{
  float x;
  float y;
  float speed;
  float count;
  float angle;
  boolean curve;

  Pixel(float x, float y, float speed, boolean curve) {
    this.x = x;
    this.y = y;
    this.speed = speed;
    this.curve = curve;
  }

  void update() {
    y+=speed;
    if(y > height) {
      y = 0;
    }
  }

  void display() {
    stroke(255);
      point(x, y+5);
      point(width-x, y+5);
  }

}