+ Axis of rotation:              [ 0,  0, *]

x An input point to be rotated   [+6,  0, *]

o Several stopping points:       [-2, +6, *]
                                 [-1, +5, *]
                                 [ 0, +7, *]
                                 [+1, +6, *]
      |
      o            
  o   | o          
    o 5
      |
      |
      |                  
      |
- - - + - - - - 5 x    
      |
      |
      |