diff --git a/src/simg.js b/src/simg.js
index d1b0f16..52206af 100755
--- a/src/simg.js
+++ b/src/simg.js
@@ -1,135 +1,132 @@
+// From https://github.com/krunkosaurus/simg/blob/master/src/simg.js
+
 /*jshint nonstandard:true */
-(function(root){
-  var previousSimg = root.Simg;
-  var Simg = root.Simg = function(svg){
-    this.svg = svg;
-  };
+export class Simg {
 
-  Simg.noConflict = function(){
-    root.Simg = previousSimg;
-    return this;
-  };
+  constructor(svg) {
+    this.svg = svg;
+  }
 
-  Simg.getBase64Image = function(img) {
+  getBase64Image = (img) => {
     // From: http://stackoverflow.com/questions/934012/get-image-data-in-javascript
-    var canvas = document.createElement("canvas");
+    var canvas = document.createElement('canvas');
     canvas.width = img.width;
     canvas.height = img.height;
 
-    var ctx = canvas.getContext("2d");
+    var ctx = canvas.getContext('2d');
     ctx.drawImage(img, 0, 0);
-    var dataURL = canvas.toDataURL("image/png");
+    var dataURL = canvas.toDataURL('image/png');
 
-    return dataURL.replace(/^data:image\/(png|jpg);base64,/, "");
+    return dataURL.replace(/^data:image\/(png|jpg);base64,/, '');
   };
 
-  Simg.prototype = {
+  // Return SVG text.
+  toString = (svg) => {
+    if (!svg){
+      throw new Error('.toString: No SVG found.');
+    }
 
-    // Return SVG text.
-    toString: function(svg){
-      if (!svg){
-        throw new Error('.toString: No SVG found.');
-      }
+    [
+      ['version', 1.1],
+      ['xmlns', 'http://www.w3.org/2000/svg'],
+    ].forEach(function(item){
+      svg.setAttribute(item[0], item[1]);
+    });
+    return svg.outerHTML;
+  }
+
+  // Return canvas with this SVG drawn inside.
+  toCanvas = (cb) => {
+    this.toSvgImage(function(img){
+      var canvas = document.createElement('canvas');
+      var context = canvas.getContext('2d');
+
+      canvas.width = img.width;
+      canvas.height = img.height;
+
+      context.drawImage(img, 0, 0);
+      cb(canvas);
+    });
+  }
+
+  toSvgImage = (cb) => {
+    var str = this.toString(this.svg);
+    var img = document.createElement('img');
+
+    if (cb){
+      img.onload = function(){
+        cb(img);
+      };
+    }
+
+    // Make the new img's source an SVG image.
+    img.setAttribute('src', 'data:image/svg+xml;base64,'+ btoa(unescape(encodeURIComponent(str))));
+  }
 
-      [
-        ['version', 1.1],
-        ['xmlns', "http://www.w3.org/2000/svg"],
-      ].forEach(function(item){
-        svg.setAttribute(item[0], item[1]);
-      });
-      return svg.outerHTML;
-    },
-
-    // Return canvas with this SVG drawn inside.
-    toCanvas: function(cb){
-      this.toSvgImage(function(img){
-        var canvas = document.createElement('canvas');
-        var context = canvas.getContext("2d");
-
-        canvas.width = img.width;
-        canvas.height = img.height;
-
-        context.drawImage(img, 0, 0);
-        cb(canvas);
-      });
-    },
-
-    toSvgImage: function(cb){
-      var str = this.toString(this.svg);
+  // Returns callback to new img from SVG.
+  // Call with no arguments to return svg image element.
+  // Call with callback to return png image element.
+  toImg = (cb) => {
+    this.toCanvas(function(canvas){
+      var canvasData = canvas.toDataURL('image/png');
       var img = document.createElement('img');
 
+      img.onload = function(){
+        cb(img);
+      };
+
+      // Make pngImg's source the canvas data.
+      img.setAttribute('src', canvasData);
+    });
+  }
+
+  // Replace SVG with PNG img.
+  replace = (cb) => {
+    var self = this;
+    this.toImg(function(img){
+      var parentNode = self.svg.parentNode;
+      parentNode.replaceChild(img, self.svg);
       if (cb){
-        img.onload = function(){
-          cb(img);
-        };
+        cb();
       }
-
-      // Make the new img's source an SVG image.
-      img.setAttribute('src', 'data:image/svg+xml;base64,'+ btoa(unescape(encodeURIComponent(str))));
-    },
-
-    // Returns callback to new img from SVG.
-    // Call with no arguments to return svg image element.
-    // Call with callback to return png image element.
-    toImg: function(cb){
-      this.toCanvas(function(canvas){
-        var canvasData = canvas.toDataURL("image/png");
-        var img = document.createElement('img');
-
-        img.onload = function(){
-          cb(img);
-        };
-
-        // Make pngImg's source the canvas data.
-        img.setAttribute('src', canvasData);
-      });
-    },
-
-    // Replace SVG with PNG img.
-    replace: function(cb){
-      var self = this;
-      this.toImg(function(img){
-        var parentNode = self.svg.parentNode;
-        parentNode.replaceChild(img, self.svg);
-        if (cb){
-          cb();
-        }
-      });
-    },
-
-    // Converts canvas to binary blob.
-    toBinaryBlob: function(cb){
-      this.toCanvas(function(canvas){
-        var dataUrl = canvas.toDataURL().replace(/^data:image\/(png|jpg);base64,/, "");
-        var byteString = atob(escape(dataUrl));
-        // write the bytes of the string to an ArrayBuffer
-        var ab = new ArrayBuffer(byteString.length);
-        var ia = new Uint8Array(ab);
-        for (var i = 0; i < byteString.length; i++) {
-          ia[i] = byteString.charCodeAt(i);
-        }
-        var dataView = new DataView(ab);
-        var blob = new Blob([dataView], {type: "image/png"});
-        cb(blob);
-      });
-    },
-
-    // Trigger download of image.
-    download: function(filename){
-      if (!filename){
-        filename = 'chart';
+    });
+  }
+
+  // Converts canvas to binary blob.
+  toBinaryBlob = (cb) => {
+    this.toCanvas(canvas => {
+      var dataUrl = canvas.toDataURL().replace(/^data:image\/(png|jpg);base64,/, '');
+      var byteString = atob(escape(dataUrl));
+      // write the bytes of the string to an ArrayBuffer
+      var ab = new ArrayBuffer(byteString.length);
+      var ia = new Uint8Array(ab);
+      for (var i = 0; i < byteString.length; i++) {
+        ia[i] = byteString.charCodeAt(i);
       }
-      this.toImg(function(img){
-        var a = document.createElement("a");
-        // Name of the file being downloaded.
-        a.download = filename + ".png";
-        a.href = img.getAttribute('src');
-        // Support for Firefox which requires inserting in dom.
-        a.style.display = 'none';
-        document.body.appendChild(a);
-        a.click();
-        document.body.removeChild(a);
-      });
+      var dataView = new DataView(ab);
+      var blob = new Blob([dataView], {type: 'image/png'});
+      cb(blob);
+    });
+  }
+
+  // Trigger download of image.
+  download = (filename) => {
+    if (!filename){
+      filename = 'chart';
     }
-  };
-})(this);
+    this.toImg(img => {
+      var a = document.createElement('a');
+      // Name of the file being downloaded.
+      a.download = filename + '.png';
+      a.href = img.getAttribute('src');
+      // Support for Firefox which requires inserting in dom.
+      a.style.display = 'none';
+      document.body.appendChild(a);
+      a.click();
+      document.body.removeChild(a);
+    });
+  }
+
+}
+
+export default Simg;