HSB 2.2

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(100);

​

}

​

function draw() {

  //background(0);

  colorMode(HSB, 360, 100, 100);

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

  stroke(col, 100, 100);

  //line(mouseX, 0, mouseX, height);

  for(i=0; i<width; i++)

  {

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

    var sat = map(mouseX, 0, width, 0, 100);

    stroke(col, sat, 100);

    line(i, 0, i, height);  

​

  push();

  translate(width/2, height/2);

  rotate(radians(col) );

  rectMode(CENTER);

  noFill();

  rect(0, 0, col, col);

    pop();

  }

}