Segments

A segment is an unordered pair of points. A segment may be translated by a P, and the midpoint taken:

  segment L1 = segment(P(0,0), P(2,4));
  P mid = L1.midpoint();
  segment L2(mid, P(-2,3)); // form segment
  L2 += P(1,0);             // translate L2 by (1,0)
  L1.draw(); L2.draw();
  dot(L1*L2);               // point of intersection