Procedure to produce discretized path composed by semi-circle and   straigth sub-paths
  Some problems founds in teaching physics related to curved paths that are unfortunately only described as illustration. A simple way to introduce the path is presented, which can help students to test their concept numerically. The procedure is limited into semi-circle and straight sub-paths. Smaller discretizing width $\Delta{}s$ gives better form of the produced path. 
Sparisoma Viridi
physics.comp-ph