/**
* a simple plasma sketch using the processing noise function 
* by <a href="http://www.local-guru.net/blog">Guru</a>
*/

void setup() {
  size(300,300);
  smooth();
  frameRate(25);
}

boolean black = false;

float a =0;
void draw() {
  if (black) {
    colorMode(RGB);
  } else {
    colorMode(HSB);
  }
  
  loadPixels();
  for( int y=0; y < height; y++) {
    for( int x=0; x < width; x++) {
      if (black) {
        pixels[ x + y*width ] = color( 255*(1-noise( x * 0.01, y*0.01, a )));
      } else {
        pixels[ x + y*width ] = color( 255*noise( x * 0.01, y*0.01, a ),255,255); 
      }
    }
  }
  updatePixels();
  a+=0.005;
}

void keyPressed() {
  black = !black;
}