zoomFromCenter method
Zooms the canvas in or out from the center of the viewport by a given factor.
Implementation
@override
void zoomFromCenter(double zoomFactor) {
if (!mounted) return;
final canvasSize = context.size;
if (canvasSize == null) return;
applyZoomAtPoint(
Offset(canvasSize.width / 2, canvasSize.height / 2),
zoomFactor,
);
}