The Tool Options Panel allows you to specify:
- Lock Aspect Ratio : Prevent from changing the ratio x:y of the bounding box of the selected Handles.
Select multiple Handles, by either:
- Pressing to select all Handles
- Dragging a rectangle around a group of Handles
- Holding the key while clicking Handles to toggle their selected status
Then drag one of the selected Handles. All the selected Handles will be scaled relative to the center of the selected group.
When scaling a selection don't drag a Handle that its position is close to the X or Y center of the bounding box. Select a Handle that is close to one of the corners of the bounding box. If you drag from a Handle that have a X or Y coordinate that is the same than the center of the bounding box it would produce an infinite scale factor and a very difficult to control scaled shape. (The Handles that aren't over the bounding box X or Y center are scaled by a huge factor). This is a behavior that should be corrected (for example giving to the user corner pulling anchors to allow make a correct scaling).