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HTML

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<img id="i" src="http://fabricjs.com/assets/ladybug.png" />
<canvas id="c" width="500" height="500"></canvas>

JavaScript

Module

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var BoundsHelper = (function () {
  function BoundsHelper(asset) {
    this.assetRect = asset.getBoundingRect();
  }
  Object.defineProperty(BoundsHelper.prototype, "left", {
    get: function () {
      return this.assetRect.left;
    },
    enumerable: true,
    configurable: true
  });
  Object.defineProperty(BoundsHelper.prototype, "top", {
    get: function () {
      return this.assetRect.top;
    },
    enumerable: true,
    configurable: true
  });
  Object.defineProperty(BoundsHelper.prototype, "right", {
    get: function () {
      return this.assetRect.left + this.assetRect.width;
    },
    enumerable: true,
    configurable: true
  });
  Object.defineProperty(BoundsHelper.prototype, "bottom", {
    get: function () {
      return this.assetRect.top + this.assetRect.height;
    },
    enumerable: true,
    configurable: true
  });
​
  Object.defineProperty(BoundsHelper.prototype, "height", {
    get: function () {
      return this.assetRect.height;
    },
    enumerable: true,
    configurable: true
  });
  Object.defineProperty(BoundsHelper.prototype, "width", {
    get: function () {
      return this.assetRect.width;
    },
    enumerable: true,
    configurable: true
  });
  return BoundsHelper;
})();
​
////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////
​
var canvas = new fabric.Canvas('c');
var rectangle = new fabric.Rect({
  fill: 'black',
  originX: 'left',
  originY: 'top',
  stroke: 'false',
  opacity: 1,
  left: 180,
  top: 180,
  height: 50,
  width: 50
});
var rectangleBounds = new BoundsHelper(rectangle);
var image = new fabric.Image(i, {
  selectable: false,
  borderColor: 'black',
  width: 200,
  height: 200
});
​
canvas.on("object:scaling", function (event) {
  var object = event.target;
  var objectBounds = null;
  var imageBounds = null;
  var desiredLength;
  object.setCoords();
  objectBounds = new BoundsHelper(object);
  imageBounds = new BoundsHelper(image);
​
  if (objectBounds.left < imageBounds.left) {
    //object.lockScalingX = true;
    // now i have to calculate the right scaleX factor.
    desiredLength = imageBounds.left - objectBounds.right;
    object.scaleX = desiredLength / object.width;
  }
​
  if (objectBounds.right > imageBounds.right) {
   // object.lockScalingX = true;
    desiredLength = imageBounds.right - objectBounds.left;
    object.scaleX = desiredLength / object.width;
  }
​
​
  if (objectBounds.top < imageBounds.top) { 
   // object.lockScalingY = true;
    desiredLength = imageBounds.top - objectBounds.bottom;
    object.scaleY = desiredLength / object.height;
  }
​
  if (objectBounds.bottom > imageBounds.bottom) {
    //object.lockScalingY = true;
    desiredLength = imageBounds.bottom - objectBounds.top;
    object.scaleY = desiredLength / object.height;
  }
​
return true;
});
​
canvas.onBeforeScaleRotate = function (targetObject) {
  targetObject.lockScalingX = targetObject.lockScalingY = false;
​
  return true;
};
​
canvas.on('after:render', function() {
  canvas.contextContainer.strokeStyle = '#555';
​
  var bound = image.getBoundingRect();
​
  canvas.contextContainer.strokeRect(
    bound.left + 0.5,
    bound.top + 0.5,
    bound.width,
    bound.height
  );
});
​
canvas.add(image);
canvas.centerObject(image);
image.setCoords();
canvas.add(rectangle);
canvas.renderAll();
​
​

CSS

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img {
  display: none;
}
​
canvas {
  border: solid black 1px;
}

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