// http://www.processing.org/reference/noise_.html
//
// Returns the Perlin noise value at specified coordinates.
// Perlin noise is a random sequence generator producing a more natural,
// harmonic succession of numbers than that of the standard random() function.
// It was invented by Ken Perlin in the 1980s and has been used
// in graphical applications to generate procedural textures, shapes,
// terrains, and other seemingly organic forms.
//

float noiseScale=0.02;

void setup() {
  size(400, 300);
}

void draw() {
  background(0);
  for (int x=0; x < width; x++) {
    float noiseVal = noise((mouseX+x)*noiseScale, mouseY*noiseScale);
    stroke(noiseVal*255);
    line(x, mouseY+noiseVal*80, x, height);
  }
}