Mousewheel on an object

HTML

<script src="https://rawgithub.com/kangax/fabric.js/master/dist/fabric.js"></script>
<canvas id="c" width="600" height="600"></canvas>

CSS

canvas {
    border: 1px solid #999;
}

JavaScript

/**
 * fabric.js template for bug reports
 *
 * Please update the name of the jsfiddle (see Fiddle Options).
 * This templates uses latest dev verison of fabric.js (https://rawgithub.com/kangax/fabric.js/master/dist/all.js).
 */

// initialize fabric canvas and assign to global windows object for debug
var canvas = window._canvas = new fabric.Canvas('c');

var rect = new fabric.Rect({
    left: 100,
    top: 100,
    width: 100,
    height: 75,
    fill: 'rgba(255,0,0,0.5)',
});

var circle = new fabric.Circle({
    left: 200,
    top: 300,
    radius: 75,
    fill: 'rgba(0,255,0,0.5)',
});

fabric.Image.fromURL('http://fabricjs.com/assets/pug_small.jpg', function(img){
    canvas.add(img.scale(0.4).set({ left: 450, top: 200, angle: 20 }));
});

canvas.add(rect, circle);

$(canvas.wrapperEl).on('mousedown', function(e) {
  $(this).on('mousemove', function() {

    var target = canvas.findTarget(e);
        var delta = 1;

        if (target) {
        if(target.width > 200) {
        		target.width += 200;
            target.height += 200; 
        } else {
        		target.width += delta;
            target.height += delta; 
        }
                   

            target.setCoords();
            canvas.renderAll();
            return false;
        }

  });
    
});