a port of the Processing Visualization Language

### SineWave

by Daniel Shiffman. Render a simple sine wave.

```// 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 theta = 0.0;       // Start angle at 0

float amplitude = 75.0;  // Height of wave

float period = 500.0;    // How many pixels before the wave repeats

float dx;                 // 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;

dx = (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;

// For every x value, calculate a y value with sine function

float x = theta;

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

yvalues[i] = sin(x)*amplitude;

x+=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);

}

}```