Wave Follower - OpenProcessing

mySketch
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float a = 10;
float b = 100;
float a2 = 10;
float b2 = 100;
boolean pause = false;
​
float x(float t) {
  return sin(t/a)*b;
}
​
float y(float t) {
  return cos(t/a2)*b2;
}
​
float t = 1;
​
int ellipseR = 10;
​
void setup() {
  size(1000, 1000);
  background(21);
  frameRate(240);
}
​
void draw() {
  noStroke();
  fill(21, 21, 21, 50);
  //rect(0, 0, width, height);
​
  translate(width/2, height/2);
​
  fill(255, 255, 255);
  ellipse(x(t), y(t), ellipseR, ellipseR);
​
  if (!pause) {
    t += 0.5;
  }
}
​
void mousePressed() {
  a = random(5, 15);
  b = random(0, 500);
  a2 = random(5, 15);
  b2 = random(0, 500);
​
  background(21);
  pause = false;
}
​
void keyPressed() {
  if (!pause)
    pause = true;
​
  else if (pause)
    pause = false;
}
​