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CSS Base

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              <canvas class="rainbow-pixel-canvas"></canvas>
Double tap to clear the canvas
              .rainbow-pixel-canvas {
  border: solid 2px gray;
  -ms-touch-action: none;
      touch-action: none;
              var pixelSize = 16;

    // snap to the corners of a grid
    mode: 'grid',
    // specify the grid dimensions
    grid: { x: pixelSize, y: pixelSize }
    max: Infinity,
    maxPerElement: Infinity
  // draw colored squares on move
  .on('dragmove', function (event) {
    var context = event.target.getContext('2d'),
        // calculate the angle of the drag direction
        dragAngle = 180 * Math.atan2(event.dx, event.dy) / Math.PI;

    // set color based on drag angle and speed
    context.fillStyle = 'hsl(' + dragAngle + ', 86%, '
                        + (30 + Math.min(event.speed / 1000, 1) * 50) + '%)';

    // draw squares
    context.fillRect(event.pageX - pixelSize / 2, event.pageY - pixelSize / 2,
                     pixelSize, pixelSize);
  // clear the canvas on doubletap
  .on('doubletap', function (event) {
    var context = event.target.getContext('2d');

    context.clearRect(0, 0, context.canvas.width, context.canvas.height);

  function resizeCanvases () {
    [].forEach.call(document.querySelectorAll('.rainbow-pixel-canvas'), function (canvas) {
      canvas.width = document.body.clientWidth;
      canvas.height = window.innerHeight * 0.7;

  // interact.js can also add DOM event listeners
  interact(document).on('DOMContentLoaded', resizeCanvases);
  interact(window).on('resize', resizeCanvases);

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