Update docs for the crop container options.

Author: Sepand Parhami

docs/demo/zoom-crop/README.md

@@ -1 +1,3 @@
-Like the hero demo, but starting zoomed in on part of the image. This uses an outer cropping container to zoom in on part of the image.
+Like the hero demo, but starting zoomed in on part of the image. This uses an outer cropping container to zoom in on part of the image.
+
+See the [image crop calculator](../../tools/img-cropper) to generate the markup needed for the initial crop.

docs/demo/zoom-crop/index.html

@@ -40,6 +40,8 @@
           </div>
 
           <p>
+            See the <a href="../../tools/img-cropper">image crop calculator</a> to generate the markup needed for the initial crop.
+          </p><p>
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           </p><p>
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docs/prepare-image-animation.md

@@ -33,6 +33,7 @@ setTimeout(() => {
 * [Image gallery](./demo/gallery)
 * [Inline image expansion](./demo/expand)
 * [Panning an image back and forth](./demo/pan)
+* [Cropped image animation](./demo/zoom-crop)
 
 ### How `prepareImageAnimation` Works
 
@@ -156,6 +157,25 @@ applyAnimation();
 
 The forced style calculation caused by `prepareImageAnimation` can be avoided if you already know where `targetImg` will be positioned. Note that in this case, you will still need to provide a `targetImg` to the function so that the animation knows the `object-fit` property to animate to.
 
+#### `srcCropRect`
+
+Defaults to `srcImgRect`. If you want to crop your image using a wrapping element, you can specify this to control the initial crop of the image.
+
+See:
+
+- [zoom/crop animation demo](./demo/zoom-crop)
+- [image crop calculator](./tools/img-cropper)
+
+#### `targetCropRect`
+
+Defaults to `targetImgRect`. If you want to crop your image using a wrapping element, you can specify this to control the ending crop of the image.
+
+See:
+
+- [zoom/crop animation demo](./demo/zoom-crop)
+- [image crop calculator](./tools/img-cropper)
+
+
 #### `curve`
 
 This option defaults to the built-in `ease-in-out` transition timing function (`{x1: 0.42, y1: 0, x2: 0.58, y2: 1}`). This is an object with the control points for a [`cubic-bezier()`](https://developer.mozilla.org/en-US/docs/Web/CSS/single-transition-timing-function#The_cubic-bezier()_class_of_timing_functions) curve and is used to determine the animation progress for the position, size and crop at any given time.