How to scale object dynamically up to canvas size in Fabric.js

Question

I want to increase height and width of my svg image same as canvas height and width so that it look like background image of canvas. When I press Set Background button, one svg image will be set to canvas from my directory. I want to scale this image up to canvas height and width dynamically.

Expected Output: I want this

Html

<h1>canvas</h1>
<canvas style="left: -300px; border: 1px dotted;" height="385" width="400" id="c"></canvas>
<input type="button" id="svg3" value="set background" />

Script

$(document).ready(function(){
    var canvas = new fabric.Canvas('c');
    var colorSet="red";
    $("#svg3").click(function(){
        fabric.loadSVGFromURL('http://upload.wikimedia.org/wikipedia/en/c/cd/-Islandshreyfingin.svg', function (objects, options) { 
            var shape = fabric.util.groupSVGElements(objects, options);
            shape.set({
                left: 150,
                top:200,
                //height: 700,
                //width: 700,
                scaleX: .35,
                scaleY:.35
            });

            if (shape.isSameColor && shape.isSameColor() || !shape.paths) {
                shape.setFill(colorSet);
            } else if (shape.paths) {
                for (var i = 0; i < shape.paths.length; i++) {
                    shape.paths[i].setFill(colorSet);
                }
            }

            canvas.add(shape);
            canvas.renderAll();
        });
    });
});

Here is my FIDDLE Demo.

Does anybody have an idea how to do this?

Answer 1

You know your canvas width and height. So this will work:

shape.set({
    top: canvas.height/2,
    left: canvas.width/2,
    scaleY: canvas.height / shape.height,
    scaleX: canvas.width / shape.width
});