Small OpenGL based c++ rendering library
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emath.cpp 1.5KB

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  1. /* libsegl - Sebas Extended GL Library
  2. * Collection of Opengl/3D-Math helpers
  3. *
  4. * Copyright (c) 2008 by Sebastian Lohff, seba@seba-geek.de
  5. * http://www.seba-geek.de
  6. *
  7. * This library is free software; you can redistribute it and/or
  8. * modify it under the terms of the GNU Library General Public
  9. * License as published by the Free Software Foundation; either
  10. * version 2 of the License, or (at your option) any later version.
  11. *
  12. * This library is distributed in the hope that it will be useful,
  13. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15. * Library General Public License for more details.
  16. *
  17. * You should have received a copy of the GNU Library General Public
  18. * License along with this library; if not, write to the
  19. * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  20. * Boston, MA 02110-1301, USA.
  21. */
  22. #include "emath.h"
  23. namespace segl {
  24. // Trigonometrische Funktionen
  25. float deg2rad(float deg) {
  26. return (deg/180.0f)*3.1415926535897932384626433f;
  27. }
  28. float rad2deg(float rad) {
  29. return (rad/3.1415926535897932384626433f)*180.0f;
  30. }
  31. float ssin(float c) {
  32. int t=(int)c;
  33. if(t!=c)
  34. return sin(deg2rad(c));
  35. t = t % 360;
  36. if(t<0)
  37. t = 360 + t;
  38. switch(t) {
  39. case 0:
  40. return 0.0f;
  41. case 90:
  42. return 1.0f;
  43. case 180:
  44. return 0.0f;
  45. case 270:
  46. return -1.0f;
  47. default:
  48. return sin(deg2rad(c));
  49. }
  50. }
  51. float scos(float c) {
  52. return ssin(c+90.0f);
  53. }
  54. } // namespace segl