getProjectionMatrix method
Resolves size against a unit-height view of aspectRatio. An
OrthographicSize.pixelsPerUnit size needs the view's real size, which
the engine supplies through getProjectionMatrixForViewport.
Implementation
@override
Matrix4 getProjectionMatrix(double aspectRatio, {Vector2? jitter}) =>
getProjectionMatrixForViewport(ui.Size(aspectRatio, 1.0), jitter: jitter);