# Processing.js

## 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);
}
}```