1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/* Copyright (c) Mark J. Kilgard, 1994. */
/* This program is freely distributable without licensing fees
and is provided without guarantee or warrantee expressed or
implied. This program is -not- in the public domain. */
#include <string.h>
#include <GL/glut.h>
void *font = GLUT_BITMAP_TIMES_ROMAN_24;
void *fonts[] =
{
GLUT_BITMAP_9_BY_15,
GLUT_BITMAP_TIMES_ROMAN_10,
GLUT_BITMAP_TIMES_ROMAN_24
};
char defaultMessage[] = "GLUT means OpenGL.";
char *message = defaultMessage;
void
selectFont(int newfont)
{
font = fonts[newfont];
glutPostRedisplay();
}
void
selectMessage(int msg)
{
switch (msg) {
case 1:
message = "abcdefghijklmnop";
break;
case 2:
message = "ABCDEFGHIJKLMNOP";
break;
}
}
void
selectColor(int color)
{
switch (color) {
case 1:
glColor3f(0.0, 1.0, 0.0);
break;
case 2:
glColor3f(1.0, 0.0, 0.0);
break;
case 3:
glColor3f(1.0, 1.0, 1.0);
break;
}
glutPostRedisplay();
}
void
tick(void)
{
glutPostRedisplay();
}
void
output(int x, int y, char *string)
{
int len, i;
glRasterPos2f(x, y);
len = (int) strlen(string);
for (i = 0; i < len; i++) {
glutBitmapCharacter(font, string[i]);
}
}
void
display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
output(0, 24, "This is written in a GLUT bitmap font.");
output(100, 100, message);
output(50, 145, "(positioned in pixels with upper-left origin)");
glutSwapBuffers();
}
void
reshape(int w, int h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0, w, h, 0);
glMatrixMode(GL_MODELVIEW);
}
int
main(int argc, char **argv)
{
int i, msg_submenu, color_submenu;
glutInit(&argc, argv);
for (i = 1; i < argc; i++) {
if (!strcmp(argv[i], "-mono")) {
font = GLUT_BITMAP_9_BY_15;
}
}
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
glutInitWindowSize(500, 150);
glutCreateWindow("GLUT bitmap font example");
glClearColor(0.0, 0.0, 0.0, 1.0);
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutIdleFunc(tick);
msg_submenu = glutCreateMenu(selectMessage);
glutAddMenuEntry("abc", 1);
glutAddMenuEntry("ABC", 2);
color_submenu = glutCreateMenu(selectColor);
glutAddMenuEntry("Green", 1);
glutAddMenuEntry("Red", 2);
glutAddMenuEntry("White", 3);
glutCreateMenu(selectFont);
glutAddMenuEntry("9 by 15", 0);
glutAddMenuEntry("Times Roman 10", 1);
glutAddMenuEntry("Times Roman 24", 2);
glutAddSubMenu("Messages", msg_submenu);
glutAddSubMenu("Color", color_submenu);
glutAttachMenu(GLUT_RIGHT_BUTTON);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}
|
