a port of the Processing Visualization Language

by Daniel Shiffman. Create a more complex wave by adding two waves together.

```// 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

int maxwaves = 4;   // total # of waves to add together

float theta = 0.0f;

float[] amplitude = new float[maxwaves];   // Height of wave

float[] dx = new float[maxwaves];          // Value for incrementing X, to be calculated as a function of period and xspacing

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;

for (int i = 0; i < maxwaves; i++) {

amplitude[i] = random(10,30);

float period = random(100,300); // How many pixels before the wave repeats

dx[i] = (TWO_PI / period) * xspacing;

}

yvalues = new float[w/xspacing];

}

void draw() {

background(0);

calcWave();

renderWave();

}

void calcWave() {

// Increment theta (try different values for 'angular velocity' here

theta += 0.02;

// Set all height values to zero

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

yvalues[i] = 0.0f;

}

// Accumulate wave height values

for (int j = 0; j < maxwaves; j++) {

float x = theta;

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

// Every other wave is cosine instead of sine

if (j % 2 == 0)  yvalues[i] += sin(x)*amplitude[j];

else yvalues[i] += cos(x)*amplitude[j];

x+=dx[j];

}

}

}

void renderWave() {

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

noStroke();

fill(255,50);

ellipseMode(CENTER);

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

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

}

}```