## Selecting the Mappings

You may choose from six types of mappings (see below):

- translation by dx in direction x and by dy in direction y
- axial symmetry (PQ)
- point symmetry Z
- rotation around point Z with angle α
- homothetic stretching out of Z by factor k
- shear transformation by line PQ with angle α

You define the mappings by entering the parameters required for the selected type of mapping.

Clicking "Add" a mapping is add to the list of mappings.

Clicking "Delete" the mapping is removed from the list.

It is also possible to choose several mappings of the same kind. This means that you may produce multiple symmetries
of a polygon of different lines.