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// The Nature of Code
// Daniel Shiffman
// http://natureofcode.com
// Additive Wave
// Create a more complex wave by adding two waves together.
// Maybe better for this answer to be OOP???
int xspacing = 8; // How far apart should each horizontal position be spaced
int w; // Width of entire wave
int maxwaves = 5; // total # of waves to add together
float theta = 0.0;
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(640,360);
colorMode(RGB, 255, 255, 255, 100);
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;
}
// 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 position
noStroke();
fill(255,50);
ellipseMode(CENTER);
for (int x = 0; x < yvalues.length; x++) {
ellipse(x*xspacing,height/2+yvalues[x],16,16);
}
}
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