yay

sierpinski.pde

/*
sierpinski's triangle
*/
int cx = 75;
int cy = 149;
color pink = color(255,102,255);
color black = color(0); //-16777216

void setup() {
  size(cx*2,cy+1);
  background(0);
  loadPixels();
  pixels[(cy*width)+cx] = pink;
  updatePixels();
}

void mousePressed() {
  noLoop();
}

void mouseReleased() {
  loop();
}

void draw() {
  renderScreen();
}

void renderScreen() {
  /*
    shift everything up a row to give illusion of scrolling
  */
  loadPixels();
  int j;
  for (j = 0; j < cy; j++) {
    for (int i = 0; i < width; i++) {
      pixels[(j*width)+i] = pixels[((j+1)*width)+i];
    } 
  }
  int lineStart = (j-1)*width;
  int newLineStart = j*width;
  for (int i = 1; i < width-1; i++) {
    if ((pixels[lineStart+(i-1)] != pixels[lineStart+(i+1)]) && ((pixels[lineStart+(i-1)] != -16777216) || (pixels[lineStart+(i+1)] != -16777216))) {
      pixels[newLineStart+i] = pink;
    } else {
      pixels[newLineStart+i] = black;
    }
  }
  updatePixels();
}