Viewport
This component handles camera zooming to window size and zooming in zoomable steps. The binding of [+] and [-] keys relies on the Keyboard component.
property viewPort.width : false
Let camera zoom to contain at least width.
property viewPort.height : false
Let camera zoom to contain at least height.
property viewPort.maxScale
Maximum zoom factor of camera.
property viewPort.minScale
Minimum zoom factor of camera.
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