CanvasUi implementation #2354
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CanvasUi implementation #2354
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This is a continuation of work @paulhoux started with PR #2326, implementing a
CanvasUiclass, similar toCameraUibut for 2D canvas manipulation.This PR includes two samples, one exercising most of the functionality, CanvasUi, and another showing how to implement a mini-map paired with
CanvasUicalled CanvasUiMinimap.The implementation allows customization of hotkeys and mouse interactions, but by default uses middle, right, or alt-left clicking for panning, leaving left click for selecting. It also supports several hotkeys for zoom by default.
One key concept is the notion of a bounded vs. unbounded canvas. The former is required for "fitting" functionality, which allows automatic zoom to fit height, width, etc to the window. An unbounded canvas cannot be fit to a window but allows an infinite canvas.
It's challenging for a class like this to be "all things to all men" but I believe this addresses most of the common features typically needed and should simplify samples at the very least.
Tested on macOS, MSW and Linux.