1 files changed, 80 insertions, 0 deletions
diff --git a/neighbor.js b/neighbor.js
new file mode 100644
index 0000000..5517627
--- /dev/null
+++ b/neighbor.js
@@ -0,0 +1,80 @@
+/*
+ * Neighbor.js by OKFocus - http://okfoc.us - @okfocus
+ * Version 1.0
+ * Licensed under MIT.
+ *
+ */
+
+var neighbor = function(el){
+  var base = this;
+  base.el = document.querySelector(el);
+  var img;
+
+  var active = true, hovering = false;
+  var canvas, imageData = null;
+
+  base.init = function(){
+    var url = base.el.src;
+
+    img = base.el;
+    img.onload = base.load;
+    if (img.complete) {
+      base.build( img );
+    }
+  };
+
+  base.load = function(){
+    base.build( img );
+  }
+  base.build = function( img ){
+    if (canvas) return;
+    canvas = document.createElement("canvas");
+    var nw = canvas.width = img.naturalWidth;
+    var nh = canvas.height = img.naturalHeight;
+
+    var neighbor = document.createElement("canvas");
+    var w, h, scaleW, scaleH;
+
+    var bounds = img.getBoundingClientRect();
+    w = neighbor.width = bounds.width;
+    h = neighbor.height = bounds.height;
+
+    scaleH = nh / h;
+    scaleW = nw / w;
+
+    var nctx = canvas.getContext( '2d' );
+    nctx.drawImage( img, 0, 0 );
+    nidd = nctx.getImageData( 0, 0, canvas.width, canvas.height )
+    nid = nidd.data;
+
+    var ctx = neighbor.getContext('2d');
+    var idd = ctx.createImageData( w, h );
+    var id = idd.data;
+
+    for (var i = 0; i <= w; i++) {
+      for (var j = 0; j <= h; j++) {
+        var y = Math.floor( j * scaleH );
+        var x = Math.floor( i * scaleW );
+        var np = (y * nw + x ) * 4;
+        var p = (j * w + i ) * 4;
+
+        id[ p   ] = nid[ np   ]
+        id[ p+1 ] = nid[ np+1 ]
+        id[ p+2 ] = nid[ np+2 ]
+        id[ p+3 ] = nid[ np+3 ]
+      }
+    }
+
+    ctx.putImageData( idd, 0, 0 );
+
+      base.el.parentNode.insertBefore( neighbor, base.el );
+    neighbor.style.display = base.el.style.display;
+    base.el.style.display = "none";
+  }
+
+  base.clamp = function (x, min, max) {
+    return Math.max(min, Math.min(max, x));
+  };
+
+  base.init();
+}