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  1. void Cyrus_Beck() {
  2.     double t0 = 0;
  3.     double t1 = 1;
  4.     Point D = {points_line[1].x - points_line[0].x, points_line[1].y - points_line[0].y};
  5.     points.push_back(points[0]);
  6.     for (int i = 0; i < points.size() - 1; i++) {
  7.         Point ni = {points[i].y - points[i+1].y, points[i + 1].x - points[i].x};
  8.         Point Wi = {points_line[0].x - points[i].x, points_line[0].y - points[i].y};
  9.         double d = (ni.x * D.x) + (ni.y * D.y);
  10.         double w = (Wi.x * ni.x) + (Wi.y * ni.y);
  11.  
  12.         if (d == 0) {
  13.             if (w < 0) {
  14.                 continue;
  15.             }
  16.             continue;
  17.         }
  18.         double t = -w / d;
  19.         if (d > 0) {
  20.             if (t > 1) {
  21.                 continue;
  22.             }
  23.             t0 = max(t, t0);
  24.             continue;
  25.         }
  26.  
  27.         if (t < 0) {
  28.             continue;
  29.         }
  30.         t1 = min(t, t1);
  31.     }
  32.     points.pop_back();
  33.  
  34.     //cout << t0 << " " << t1 << endl;
  35.  
  36.     Point p1 = {points_line[0].x + (points_line[1].x - points_line[0].x) * t0,
  37.                 points_line[0].y + (points_line[1].y - points_line[0].y) * t0};
  38.     Point p2 = {points_line[0].x + (points_line[1].x - points_line[0].x) * t1,
  39.                 points_line[0].y + (points_line[1].y - points_line[0].y) * t1};
  40.  
  41.     points_line[0] = p1;
  42.     points_line[1] = p2;
  43.    // cout << p1.x << " " << p1.y << endl;
  44.     //cout << p2.x << " " << p2.y << endl;
  45. }
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