在WPF中使用带有Rectangle的DataTrigger时遇到问题

I'm new to WPF and am trying to animate the changes to a Rectangle's size and position. I have my rectangle being set by binding it to an INotifyPropertyChanged property. This works fine but the changes can be extreme and I'd like it to be visually less jarring. I'm new to WPF and am trying to animate the cha