main11.js

(function() {
  
    'use strict';
    
    var isDrawing, lastPoint;
    var container11    = document.getElementById('js-container11'),
        canvas11       = document.getElementById('js-canvas11'),
        canvasWidth11  = canvas11.width,
        canvasHeight11 = canvas11.height,
        ctx11          = canvas11.getContext('2d'),
        image11        = new Image(),
        brush11        = new Image();
        
    // base64 Workaround because Same-Origin-Policy
    image11.src = 'data:image/jpeg;base64,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';
    image11.onload = function() {
      ctx11.drawImage(image11, 0, 0);
      // Show the form when Image is loaded.
      document.getElementById('form11').style.visibility = 'visible';
    };
    brush11.src = 'data:image/png;base64,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';
    
    canvas11.addEventListener('mousedown', handleMouseDown, false);
    canvas11.addEventListener('touchstart', handleMouseDown, false);
    canvas11.addEventListener('mousemove', handleMouseMove, false);
    canvas11.addEventListener('touchmove', handleMouseMove, false);
    canvas11.addEventListener('mouseup', handleMouseUp, false);
    canvas11.addEventListener('touchend', handleMouseUp, false);
    
    function distanceBetween(point1, point2) {
      return Math.sqrt(Math.pow(point2.x - point1.x, 2) + Math.pow(point2.y - point1.y, 2));
    }
    
    function angleBetween(point1, point2) {
      return Math.atan2( point2.x - point1.x, point2.y - point1.y );
    }
    
    // Only test every `stride` pixel. `stride`x faster,
    // but might lead to inaccuracy
    function getFilledInPixels(stride) {
      if (!stride || stride < 1) { stride = 1; }
      
      var pixels   = ctx11.getImageData(0, 0, canvasWidth11, canvasHeight11),
          pdata    = pixels.data,
          l        = pdata.length,
          total    = (l / stride),
          count    = 0;
      
      // Iterate over all pixels
      for(var i = count = 0; i < l; i += stride) {
        if (parseInt(pdata[i]) === 0) {
          count++;
        }
      }
      
      return Math.round((count / total) * 100);
    }
    
    function getMouse(e, canvas11) {
      var offsetX = 0, offsetY = 0, mx, my;
  
      if (canvas11.offsetParent !== undefined) {
        do {
          offsetX += canvas11.offsetLeft;
          offsetY += canvas11.offsetTop;
        } while ((canvas11 = canvas11.offsetParent));
      }
  
      mx = (e.pageX || e.touches[0].clientX) - offsetX;
      my = (e.pageY || e.touches[0].clientY) - offsetY;
  
      return {x: mx, y: my};
    }
    
    function handlePercentage(filledInPixels) {
      filledInPixels = filledInPixels || 0;
      console.log(filledInPixels + '%');
      if (filledInPixels > 50) {
        canvas11.parentNode.removeChild(canvas11);
      }
    }
    
    function handleMouseDown(e) {
      isDrawing = true;
      lastPoint = getMouse(e, canvas11);
    }
  
    function handleMouseMove(e) {
      if (!isDrawing) { return; }
      
      e.preventDefault();
  
      var currentPoint = getMouse(e, canvas11),
          dist = distanceBetween(lastPoint, currentPoint),
          angle = angleBetween(lastPoint, currentPoint),
          x, y;
      
      for (var i = 0; i < dist; i++) {
        x = lastPoint.x + (Math.sin(angle) * i) - 25;
        y = lastPoint.y + (Math.cos(angle) * i) - 25;
        ctx11.globalCompositeOperation = 'destination-out';
        ctx11.drawImage(brush11, x, y);
      }
      
      lastPoint = currentPoint;
      handlePercentage(getFilledInPixels(32));
    }
  
    function handleMouseUp(e) {
      isDrawing = false;
    }
    
  })();