Remove commented line.
Class Cell, used to simplify position calculations.
Calculating north and south positions in Cell.
Calculating east position in Cell.
Refactoring tests.
Calculating west point.
Calculating center point.
Calculating north-west point.
Calculating north-east point.
Calculating south-west point.
Calculating south-east point.
Cell calculations now accept margin.
Cell calculations now accept margin.
Improve function names in tests
Fix bug in Identity: inverse x/y.
Fix bug in Identity: inverse x/y.
Square is drew as default shape.
Square type does nothing because of inheritance.
Type name changes: Star is now Rhombus
Improving Circle type .