onCanvasScaleUpdate method
Implementation
void onCanvasScaleUpdate(ScaleUpdateDetails details) {
if (canUpdateCanvasModel) {
_animationController?.repeat();
_updateCanvasModelWithLastValues();
double previousScale = transformScale;
transformPosition += details.focalPoint - _lastFocalPoint;
transformScale = keepScaleInBounds(details.scale, _baseScale);
var focalPoint = (details.localFocalPoint - transformPosition);
var focalPointScaled = focalPoint * (transformScale / previousScale);
_lastFocalPoint = details.focalPoint;
transformPosition += focalPoint - focalPointScaled;
_animationController?.reset();
}
}