vrrm

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(100);

​

}

​

function draw() {

  colorMode(HSB, 360,100,100);

  var col = map (mouseX, 0, width, 0, 360);

  stroke(col,100,100)

  if (mouseIsPressed)

    line(mouseX,0,mouseX,height);

  translate (width/2,height/2);

  rotate(radians(col) );

  rectMode(CENTER)

  noFill();

  rect(0,0,col,col);

  ellipse(mouseX, mouseY, 20, 20);

}