Animate an image based on the scroll position.
Initialize ScrollSpin with the element to mount the image in, and an array of image urls.
In index.html, there is an element with the id scrollspin that is styled with css to be a fixed position background. frames.js loads the example frames array, and ScrollSpin can be initialized as follows:
new ScrollSpin(document.getElementById('scrollspin'), frames)
There is an optional 3rd argument that accepts an options object.
The options are:
frameDistance - Distance to scroll before next image (default 20)
initialPreloadCount - How many images to preload in the first batch (default 10)