1 /* Unicode libdrawtext example.

2 *

3 * Important parts are marked with XXX comments.

4 */

5 #include <stdio.h>

6 #include <stdlib.h>

7

8 #ifndef __APPLE__

9 #include <GL/glut.h>

10 #else

11 #include <GLUT/glut.h>

12 #endif

13

14 #include "drawtext.h"

15

16 void disp(void);

17 void reshape(int x, int y);

18 void keyb(unsigned char key, int x, int y);

19

20 /* XXX fonts are represented by the opaque struct dtx_font type, so you

21 * need to create at least one with dtx_open_font (see main).

22 */

23 struct dtx_font *fntmain, *fntcjk, *fntklingon;

24

25 #define FONT_SZ 24

26

27 int main(int argc, char **argv)

28 {

29 glutInit(&argc, argv);

30 glutInitWindowSize(512, 384);

31 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);

32 glutCreateWindow("libdrawtext example: unicode");

33

34 glutDisplayFunc(disp);

35 glutReshapeFunc(reshape);

36 glutKeyboardFunc(keyb);

37

38 /* XXX dtx_open_font opens a font file and returns a pointer to dtx_font */

39 if(!(fntmain = dtx_open_font("serif.ttf", 0))) {

40 return 1;

41 }

42 dtx_prepare_range(fntmain, FONT_SZ, 0, 256); /* ASCII */

43 dtx_prepare_range(fntmain, FONT_SZ, 0x370, 0x400); /* greek */

44 dtx_prepare_range(fntmain, FONT_SZ, 0x400, 0x500); /* cyrilic */

45

46 if(!(fntcjk = dtx_open_font("cjk.ttf", 0))) {

47 return 1;

48 }

49 dtx_prepare_range(fntcjk, FONT_SZ, 0x4e00, 0x9fc0); /* kanji */

50

51 if(!(fntklingon = dtx_open_font("klingon.ttf", 0))) {

52 return 1;

53 }

54 dtx_prepare_range(fntklingon, FONT_SZ, 0xf8d0, 0xf900); /* klingon */

55

56 glutMainLoop();

57 return 0;

58 }

59

60 /* various UTF-8 strings */

61 const char *english_text = "Hello world!";

62 const char *greek_text = "\xce\x9a\xce\xbf\xcf\x8d\xcf\x81\xce\xb1\xcf\x83\xce\xb7";

63 const char *russian_text = "\xd0\xa0\xd0\xb0\xd1\x81\xd1\x86\xd0\xb2\xd0\xb5\xd1\x82\xd0\xb0\xd0\xbb\xd0\xb8 \xd1\x8f\xd0\xb1\xd0\xbb\xd0\xbe\xd0\xbd\xd0\xb8 \xd0\xb8 \xd0\xb3\xd1\x80\xd1\x83\xd1\x88\xd0\xb8";

64 const char *kanji_text = "\xe4\xb9\x97\xe4\xba\xac";

65 const char *klingon_text = "\xef\xa3\xa3\xef\xa3\x9d\xef\xa3\x93\xef\xa3\x98\xef\xa3\x9d\xef\xa3\xa2\xef\xa3\xa1\xef\xa3\x9d\xef\xa3\x99";

66

67 void draw_box(struct dtx_box *box)

68 {

69 glBegin(GL_LINE_LOOP);

70 glColor3f(0, 1, 0);

71 glVertex2f(box->x, box->y);

72 glVertex2f(box->x + box->width, box->y);

73 glVertex2f(box->x + box->width, box->y + box->height);

74 glVertex2f(box->x, box->y + box->height);

75 glEnd();

76 glColor3f(1, 1, 1);

77 }

78

79 void disp(void)

80 {

81 glClear(GL_COLOR_BUFFER_BIT);

82

83 glMatrixMode(GL_MODELVIEW);

84 glLoadIdentity();

85

86 dtx_use_font(fntmain, FONT_SZ);

87

88 glTranslatef(-200, 150, 0);

89 /* XXX call dtx_string to draw utf-8 text.

90 * any transformations and the current color apply

91 */

92 dtx_string(english_text);

93

94 glTranslatef(0, -40, 0);

95 dtx_string(greek_text);

96

97 glTranslatef(0, -40, 0);

98 dtx_string(russian_text);

99

100 dtx_use_font(fntcjk, FONT_SZ);

101

102 glTranslatef(0, -40, 0);

103 dtx_string(kanji_text);

104

105 dtx_use_font(fntklingon, FONT_SZ);

106

107 glTranslatef(0, -40, 0);

108 dtx_string(klingon_text);

109

110 glutSwapBuffers();

111 }

112

113 void reshape(int x, int y)

114 {

115 glViewport(0, 0, x, y);

116

117 glMatrixMode(GL_PROJECTION);

118 glLoadIdentity();

119 glOrtho(-x/2, x/2, -y/2, y/2, -1, 1);

120 }

121

122 void keyb(unsigned char key, int x, int y)

123 {

124 if(key == 27) {

125 exit(0);

126 }

127 }