a port of the Processing Visualization Language

NoiseWave

by Daniel Shiffman. Using Perlin Noise to generate a wave-like pattern.

Original Processing.org Example: NoiseWave

// All Examples Written by Casey Reas and Ben Fry

// unless otherwise stated.

int xspacing = 8;   // How far apart should each horizontal location be spaced

int w;              // Width of entire wave



float yoff = 0.0f;        // 2nd dimension of perlin noise

float[] yvalues;          // Using an array to store height values for the wave (not entirely necessary)



void setup() {

  size(200,200);

  frameRate(30);

  colorMode(RGB,255,255,255,100);

  smooth();

  w = width+16;

  yvalues = new float[w/xspacing];

}



void draw() {

  background(0);

  calcWave();

  renderWave();



}



void calcWave() {

  float dx = 0.05f;

  float dy = 0.01f;

  float amplitude = 100.0f;



  // Increment y ('time')

  yoff += dy;



  //float xoff = 0.0;  // Option #1

  float xoff = yoff; // Option #2



  for (int i = 0; i < yvalues.length; i++) {

    // Using 2D noise function

    //yvalues[i] = (2*noise(xoff,yoff)-1)*amplitude; // Option #1

    // Using 1D noise function

    yvalues[i] = (2*noise(xoff)-1)*amplitude;    // Option #2

    xoff+=dx;

  }



}



void renderWave() {

  // A simple way to draw the wave with an ellipse at each location

  for (int x = 0; x < yvalues.length; x++) {

    noStroke();

    fill(255,50);

    ellipseMode(CENTER);

    ellipse(x*xspacing,width/2+yvalues[x],16,16);

  }

}
Fork me on GitHub