Built-in Functions - OpenProcessing

mySketch
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void setup() {
  size(500, 500);
  background(255);
}
​
void draw() {
  if (mousePressed) {
    randomCircle();
  }
}
​
void randomCircle() {
  float x = random(width);
  float y = random(height);
  int diameter = floor(random(10, 50));
  
  float r = random(255);
  float g = random(255);
  float b = random(255);
  float a = random(255);
  
  fill(r, g, b, a);
  ellipse(x, y, diameter, diameter);
}