title: Clipper library polygon and point intersection
body: <p>I am running <code>clipper_console_demo.cpp</code> compiled to <code>a.out</code> with following arguments:</p>
  
  <p>Subject.txt:</p>
  
  <pre><code>50 50,
  </code></pre>
  
  <p>Clip.txt:</p>
  
  <pre><code>100 100,
  100 0,
  0 0,
  0 100,
  </code></pre>
  
  <p><code>./a.out Subject.txt Clip.txt INTERSECTION</code></p>
  
  <p>However the output 'solution.svg' is empty (there is only an outline of clipping polygon but not the subject). I also tried to change the orientation of the clipping square but solution is also empty. </p>
  
  <p>Is it not possible to compute point/polygon intersection?</p>
  
  <p>If not, what other combinations of subject/clip are not possible? As I understood from the doc, the clip has to be closed, but there are no other restrictions.</p>