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DATE: May 17, 2013, 9:20 a.m.

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  1. //Part 2. Chapter 13. Exercise 8
  2. //------------------------------------------------------------------------------
  4. struct Hexagon : Shape {
  6. Hexagon(Point Center, double radius)
  7. : rCircumCircle(radius)
  8. {
  9. add(Center);
  10. }
  12. void draw_lines() const;
  14. private:
  15. double rCircumCircle;
  16. };
  18. //------------------------------------------------------------------------------
  20. //------------------------------------------------------------------------------
  22. void Hexagon::draw_lines() const {
  24. if (fill_color().visibility()) {
  26. fl_color(fill_color().as_int());
  27. fl_begin_complex_polygon();
  29. for (int i = 0; i < 6; i++)
  30. fl_vertex(point(0).x + rCircumCircle*cos(2*M_PI*i/6),
  31. point(0).y + rCircumCircle*sin(2*M_PI*i/6));
  34. fl_end_complex_polygon();
  35. fl_color(color().as_int()); // reset color
  37. }
  39. if (color().visibility()) {
  40. fl_color(color().as_int());
  41. for (int i = 0; i < 6; i++) {
  42. int p;
  43. if (i < 5) p = i + 1;
  44. else p = 0;
  46. fl_line(point(0).x + rCircumCircle*cos(2*M_PI*i/6),
  47. point(0).y + rCircumCircle*sin(2*M_PI*i/6),
  48. point(0).x + rCircumCircle*cos(2*M_PI*p/6),
  49. point(0).y + rCircumCircle*sin(2*M_PI*p/6));
  50. }
  51. }
  52. }
  54. //------------------------------------------------------------------------------
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