text: /** Brushes */
  var RoundBrush = new Brush("Round Brush", null, function(position, size, color, context) {
      context.fillStyle = color;
      context.arc(position.x, position.y, size, 0, 2*Math.PI);
      context.fill();
  });
  
  var SquareBrush = new Brush("Square Brush", null, function(position, size, color, context) {
      context.fillStyle = color;
      context.translate(position.x + size/2, position.y + size/2);
      context.rotate(getCursorAngle(position) * Math.PI/180);
      context.rect(-size/2, -size/2, size, size);
      context.fill();
  });
  
  var ClearBrush = new Brush("Clear Brush", function(context) {
          context.globalCompositeOperation = 'destination-out';
      }, function(position, size, color, context) {
          context.arc(position.x, position.y, size, 0, 2*Math.PI);
          context.fill();
  });
  
  BrushLoader.addBrush(RoundBrush);
  BrushLoader.addBrush(SquareBrush);
  BrushLoader.addBrush(ClearBrush);