Viewport Indicator
Infinite Canvas can be used to display very large scenes. The example below has a scale factor of 16. The scene's area is 256 time the area displayed in the view.
Infinite Canvas views are used in conjunction with an "overview" that has a Viewport Indicator. The Viewport Indicator shows which portion of the main scene is visible so that users maintain their spatial orientation.
Viewport Controller is when the user moves the Indicator to quickly pan around in the main the Main View. Since the view can be very large, it make take multiple 10s of pan/swipe operations to get from one corner of the vew to another. Viewport Indicator makes this very easy.
