Mirror Tool

From Synfig

ALT-M

The mirror tool will mirror all the selected ducks about a horizontal or vertical axis passing through the mouse cursor.

For example, to mirror a bline horizontally:

• select the mirror tool, either by clicking in the toolbox or hitting alt-m
• check 'Horizontal' in the Tool Options dialog
• select the bline layer
• select all ducks in the bline by hitting control-a
• drag one of the selected ducks a little

As soon as you start dragging, the ducks will all flip about a vertical axis passing through the duck you're dragging. You will be able to drag the ducks around, but the motion will be constrained to only move left and right.