FurryBrush - OpenProcessing

mySketch
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var autoHue = true;
var manualHue = 0;
​
function setup() {
  createCanvas(windowWidth, windowHeight);
  colorMode(HSB);
  background(0);
}
​
function draw() { 
  if (autoHue) { // The brush automatically rotates through the colors of the rainbow
    fill(frameCount%360, 100, 100);
    brush();  
  }
  else { // Manual mode allows the color of the brush to be determined by the user
    fill(manualHue, 100, 100);
    brush();
  }
}
​
function brush() { //The brush is formed of randomly sized ellipses rotating in a circle
    noStroke();
    translate(mouseX, mouseY);
    rotate(frameCount);
    var brushSize = random(1,40);   
    for(let i = -brushSize; i <= brushSize; i++) {
      ellipse(i, 0, 100, 5);
    }
}
​
/* 
Press 'c' to clear the screen
Press 'H' to switch between manual color and auto color
*/
function keyTyped() { 
  if(key=='c') {
    background(0);
  }
  if(key=='H'){
    autoHue = !autoHue;
  }
}
/* 
When in manual color mode, press 'h' to make the color change
in the order of the rainbow
*/
function keyPressed(){ 
  if(key=='h'){
    if (manualHue < 360){
      manualHue += 25;
    }
    else {
      manualHue = 0;
    }
  }
}