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              <canvas id="wall"></canvas>
<div id="wallScrollerWrap">
  <div id="wallScroller"></div>
</div>
            
          
!
            
              body {
  position: absolute;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}
#wallScrollerWrap {
  position: absolute;
  z-index: 1;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
#wallScroller {
  width: 5000px;
  height: 100px;
}
            
          
!
            
              // --------------------------
// Inital Vars / Wall
// --------------------------

// Initialize IScoll for wall
var wallScroll = new IScroll('#wallScrollerWrap', {
  probeType: 3, // 1-3, 3 being the most accurate option (required for certain features) but also the most resource demanding option
  zoom: false,
  zoomMax: 1,
  scrollX: true,
  scrollY: false,
  mouseWheel: true,
});

// canvas
var c = $('#wall');
// get canvas context so we can draw on it later
var ctx = c[0].getContext('2d');
// image(s) we will be drawing...
var wall_image_urls = [
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_01.jpg',
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_02.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_03.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_04.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_05.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_06.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_07.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_08.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_09.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_10.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_11.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_12.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_13.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_14.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_15.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_16.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_17.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_18.jpg', 
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_19.jpg',
	'http://patterninteractive.com/heritage-wall/images/sections-1024/section_20.jpg'
];
var image_ready = false;

function resize_canvas() {
  var winWidth = $(window).outerWidth(true);
  var winHeight = $(window).outerHeight(true);
  c[0].width = winWidth;
  c[0].height = winHeight;
  
  // try playing around with these values to see how it affects the canvas
  // c[0].width = 400;
  // c[0].height = 200;
  // c.css({
  //   width: 600+'px',
  //   height: 200+'px'
  // });
}
// immediately resize canvas  
resize_canvas();
 
// resize canvas again if window is resized
var debounce_resize;
$(window).on('resize orientationchange', function(){
  // The timeout acts as a debounce as well has a timeout for mobile devices as they take about 2-300 ms to complete an orientationchange
  clearTimeout(debounce_resize);
  debounce_resize = setTimeout(function(){
    resize_canvas();
    // we have to now redraw the canvas or what is on it may be stretched
    if( image_ready ) { // lets make sure the images have been loaded
      draw();
    }
  }, 300);
});

// --------------------------
// load a wall image
// --------------------------

var wall_image_data;
wall_image = new Image();
// make sure you add the onload event before the src or the image may load be fire this func is defined
wall_image.onload = function(){
  imgWidth = this.width;
  imgHeight = this.height; 
  
  // store image obj in array
  wall_image_data = {
    img: this, // image obj to be drawn by canvas
    imgWidth: imgWidth,
    imgHeight: imgHeight
  }
  
  image_ready = true;
  
  // added scroll event
  wallScroll.on('scroll', function(){
    draw(this.x);
  })
  
  // draw the image
  draw(0);  
};
wall_image.src = wall_image_urls[0];

// function draw the image
function draw(x) {
  // get the image/canvas ratio
  var wallHeight = c.height();
  var img_height_ratio = wallHeight / wall_image_data.imgHeight;
  
  // clear canvas or it will show what you last drew
  ctx.clearRect(0, 0, c[0].width, c[0].height);
  // draw image with new position
  ctx.drawImage(wall_image_data.img, x, 0, wall_image_data.imgWidth*img_height_ratio,wall_image_data.imgHeight*img_height_ratio);
}
            
          
!
999px
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