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HTML

              
                <div id="wrap">
  <h2>Drag the <span>red square</span> over the left-hand image.</h2>
			<div id="container">
				<div id="draggable" class="ui-widget-content"></div>
				<a href="https://www.flickr.com/photos/potatodie/16112235816" title="hazelaar from unknown source, on Flickr"><img src="https://farm9.staticflickr.com/8629/16112235816_a79704fbc8_o.jpg" width="300" height="488" alt="hazelaar"></a>
			</div>
			<canvas id="canvas" width="300" height="488"></canvas>

		</div>
              
            
!

CSS

              
                @import url(https://fonts.googleapis.com/css?family=Open+Sans:400,800);
/* Web Fonts @import */
body {
  font: 400 normal 110%/1.3 "Open Sans", sans-serif;
  margin: 0; }
#canvas {
	border:0px solid #ccc;
	float:right;
}
#draggable { 
	width: 30px; height: 30px;
	border:4px solid rgba(255,25,25,.8); 
background:rgba(200,200,200,0.23);
	position:absolute;
	cursor:move;
}
h2 {
  font-weight: 400;
}
span{
  color: rgba(255,25,25,.8);
  font-weight: 800;
}
#container
{
	margin-right:20px;
	position:relative;
	float:left;
}
#orig
{
	border:2px solid #ccc;
	
}
#wrap
{
	width:650px;
	text-align:center;
	margin: 0 auto;
}

              
            
!

JS

              
                <!-- Tinkering fruit potatoDie (potatodie.nl) -->
$(function() {
	// Setup kaleidoscope with dom elements and perhaps start coordinates
	var kaleidoscope = new Kaleidoscope90 ( {
		peephole: document.getElementById('draggable'),
		original: $("#container img")[0],
		outputCanvas: document.getElementById('canvas'),
		x: (typeof start_x === 'undefined') ? 92 : start_x,
		y: (typeof start_y === 'undefined') ? 132 : start_y
	});
});

/**
 * Kaleidoscope90 repeats a reflected and rotated square (tile)
 * Initialize it with the necessary DOM elements
 */
var Kaleidoscope90 = function ( options ) {
	var $peephole,
			peepholeWidth,
			peepholeHeight,
			original,
			outputCtx,
			tileCanvas,
			tileCanvasCtx;

	init( options );
	
	function init ( options ) {
		$peephole = $(options.peephole);
		peepholeWidth = $peephole.width();
		peepholeHeight = $peephole.height();
		original = options.original;
		outputCtx = options.outputCanvas.getContext('2d');

		tileCanvas = document.createElement("canvas");
		tileCanvas.width = peepholeWidth * 2;
		tileCanvas.height = peepholeHeight * 2;
		tileCanvasCtx = tileCanvas.getContext("2d");

		$peephole.css ( {left: options.x, top: options.y});
		draw();

		// Make the peephole draggable (GSAP). Redraw on drag
    Draggable.create($peephole, {
      bounds:original,
      edgeResistance:0.65,
      type:"x,y", 
      onDrag: draw
    })
	}
	
	/**
	 * Do the actual drawing
	 */
	function draw( ) {
		createTile();
		fill( tileCanvas, outputCtx );
	}

	/**
	 * Create tile (on a canvas dedicated to that purpose) using copies of peephole
	 * @return none: the canvas is a closure var
	 */
	function createTile () {

		var sx = $peephole.position().left,
				sy = $peephole.position().top,
				w = peepholeWidth,
				h = peepholeHeight,
				ctx = tileCanvasCtx; // Reuse of canvas (for performance optimization)

		// Copy peephole unaffected
		ctx.drawImage(original, sx, sy, w, h, 0, 0, w, h);

		// Mirror horizontal and draw on the right spot
		ctx.scale(-1,1); 
		ctx.drawImage(original, sx, sy, w, h, -2*w, 0, w, h );

		// Flip vertically too (quadrant roght bottom)
		ctx.scale(1,-1);
		ctx.drawImage( original, sx, sy, w, h, -2*w, -2*h, w, h)

		// Flip hor again (for quadrant left bottom)
		ctx.scale(-1,1);	
		ctx.drawImage( original, sx, sy, w, h, 0, -2*h, w, h)
	}	

		
	/**
	 * Fill canvas with tile
	 */
	function fill ( tile, ctx ) {

		outputCtx.rect(0, 0, outputCtx.canvas.width, outputCtx.canvas.height);
		outputCtx.fillStyle = outputCtx.createPattern(tile, "repeat");
		outputCtx.fill();

	}

	/**
	 * export data
	 * @return {ImageData} Resulting graphics
	 */
	function getImageData () {
    // For the future
	}

	return {
		getImageData: getImageData
	}
};
              
            
!
999px

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