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  1. /*
  2. * libee ASCII-Art library
  3. * Copyright (c) 2002, 2003 Sam Hocevar <sam@zoy.org>
  4. * All Rights Reserved
  5. *
  6. * $Id$
  7. *
  8. * This program is free software; you can redistribute it and/or modify
  9. * it under the terms of the GNU General Public License as published by
  10. * the Free Software Foundation; either version 2 of the License, or
  11. * (at your option) any later version.
  12. *
  13. * This program is distributed in the hope that it will be useful,
  14. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. * GNU General Public License for more details.
  17. *
  18. * You should have received a copy of the GNU General Public License
  19. * along with this program; if not, write to the Free Software
  20. * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21. */
  22. #include "config.h"
  23. #ifdef USE_SLANG
  24. # include <slang.h>
  25. #elif USE_NCURSES
  26. # include <curses.h>
  27. #endif
  28. #include <stdlib.h>
  29. #include "ee.h"
  30. void ee_draw_triangle(int x1, int y1, int x2, int y2, int x3, int y3, char c)
  31. {
  32. ee_draw_line(x1, y1, x2, y2, c);
  33. ee_draw_line(x2, y2, x3, y3, c);
  34. ee_draw_line(x3, y3, x1, y1, c);
  35. }
  36. void ee_draw_thin_triangle(int x1, int y1, int x2, int y2, int x3, int y3)
  37. {
  38. ee_draw_thin_line(x1, y1, x2, y2);
  39. ee_draw_thin_line(x2, y2, x3, y3);
  40. ee_draw_thin_line(x3, y3, x1, y1);
  41. }
  42. void ee_fill_triangle(int x1, int y1, int x2, int y2, int x3, int y3, char c)
  43. {
  44. int x, y, xa, xb, xmax, ymax;
  45. /* Bubble-sort y1 <= y2 <= y3 */
  46. if(y1 > y2)
  47. {
  48. ee_fill_triangle(x2, y2, x1, y1, x3, y3, c);
  49. return;
  50. }
  51. if(y2 > y3)
  52. {
  53. ee_fill_triangle(x1, y1, x3, y3, x2, y2, c);
  54. return;
  55. }
  56. /* Promote precision */
  57. x1 *= 4;
  58. x2 *= 4;
  59. x3 *= 4;
  60. xmax = ee_get_width() - 1;
  61. ymax = ee_get_height() - 1;
  62. /* Rasterize our triangle */
  63. for(y = y1 < 0 ? 0 : y1; y <= y3 && y <= ymax; y++)
  64. {
  65. if(y <= y2)
  66. {
  67. xa = (y1 == y2) ? x2 : x1 + (x2 - x1) * (y - y1) / (y2 - y1);
  68. xb = (y1 == y3) ? x3 : x1 + (x3 - x1) * (y - y1) / (y3 - y1);
  69. }
  70. else
  71. {
  72. xa = (y3 == y2) ? x2 : x3 + (x2 - x3) * (y - y3) / (y2 - y3);
  73. xb = (y3 == y1) ? x1 : x3 + (x1 - x3) * (y - y3) / (y1 - y3);
  74. }
  75. if(xb < xa)
  76. {
  77. int tmp = xb;
  78. xb = xa; xa = tmp;
  79. }
  80. /* Rescale xa and xb, slightly cropping */
  81. xa = (xa + 2) / 4;
  82. xb = (xb - 2) / 4;
  83. if(xb < 0) continue;
  84. if(xa > xmax) continue;
  85. if(xa < 0) xa = 0;
  86. if(xb > xmax) xb = xmax;
  87. for(x = xa; x <= xb; x++)
  88. ee_putchar(x, y, c);
  89. }
  90. }