Rainbow software simulation of mechanical sine wave machine, written at the Exploratorium

WaveWorm.pde

// I think there's a bug in here

float magnitude = 0;
float baseAngle = 0;
int lineSpacer = 4;
int yOffset = 80;

float cx;
float cy;
float newcx;
float newcy;

void setup() {

  size(1024, 768);
  colorMode(HSB, 360, 100, 100);
  cx = width * 0.80;
  cy = height/2;
  newcx = cx;
  newcy = cy;
}

void draw() {  


  // Variables for wave
  float angle = baseAngle;
  float div = 36;
  int segment = 50;
  float x = segment;
  float lastY = height/2;

  background(0);

  //for (int i = segment; i < (width * .66) - segment; i += segment) {
  for (int i = 0; i <= 11; i++) {

    float y = height/2 + sin(radians(angle)) * magnitude/2;

    // Wave circles
    noStroke();
    fill(0, 0, 100);
    ellipse(x, y, 50, 50); 

    // Lines from top
    color lc = int(map(i, 0, 11, 0, 360));
    stroke(lc, 80, 80);
    strokeWeight(1);
    line(x, yOffset - i * lineSpacer, x, y);
    line(x, yOffset - i * lineSpacer, cx, yOffset - i * lineSpacer);

    // Update values
    angle += div;
    x += segment;
  }

  // Right circle

  stroke(0);
  strokeWeight(1);
  noFill();

  if (dist(cx, cy, mouseX, mouseY) < 125) {
    newcx = mouseX;
    newcy = mouseY; 
    magnitude = dist(cx, cy, mouseX, mouseY);
    baseAngle = degrees(atan2(cy - mouseY, cx - mouseX)) + 150;
  }

  for (int i = 0; i < 12; i++) {  
    color lc = int(map(i, 0, 11, 0, 360));
    float a = i * 30 + 90;
    stroke(lc, 80, 80);
    line(cx + cos(radians(a)) * 125, cy + sin(radians(a)) * 125, cx, yOffset - i * lineSpacer);
  } 

  fill(0, 0, 100);
  noStroke();
  ellipse(cx, cy, 250, 250);

  for (int i = 0; i < 12; i++) {  
    color lc = int(map(i, 0, 11, 0, 360));
    float a = i * 30 + 90;
    stroke(lc, 80, 80);
    line(newcx, newcy, cx + cos(radians(a)) * 125, cy + sin(radians(a)) * 125);
  }
}