Function: ComputeCanvasOrthoSize()

function ComputeCanvasOrthoSize(
   referenceWidth, 
   referenceHeight, 
   scaleMode, 
   viewportWidth, 
   viewportHeight
): number;

Orthographic half-height that maps a canvas reference rect into a viewportWidth × viewportHeight viewport under a scale mode. The single source for the engine's cameras, WidgetSystem's 'window' anchoring and editor tooling — they must agree or anchors drift from what's drawn. Fit — letterbox; both axes fit, bars on the shorter one. Fill — crop; the viewport is fully covered, overflow is clipped. FitWidth — width matches exactly; height follows the viewport aspect. FitHeight — height matches exactly; width follows the viewport aspect. Stretch — a single ortho can't scale axes independently, so it falls back to Fit.

Parameters

Parameter	Type
referenceWidth	number
referenceHeight	number
scaleMode	CanvasScaleMode
viewportWidth	number
viewportHeight	number

Returns

number