File: demo.cpp

package info (click to toggle)
ftgl 2.4.0-2
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 2,540 kB
  • sloc: cpp: 17,918; sh: 1,073; ansic: 644; makefile: 376
file content (317 lines) | stat: -rw-r--r-- 6,563 bytes parent folder | download | duplicates (2)
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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
#include <iostream>
#include <stdlib.h> // exit()

#if defined HAVE_GL_GLUT_H
#   include <GL/glut.h>
#elif defined HAVE_GLUT_GLUT_H
#   include <GLUT/glut.h>
#else
#   error GLUT headers not present
#endif

#include "FTGL/ftgl.h"

//#include "mmgr.h"

static FTFont* fonts[5];
static int width;
static int height;


// YOU'LL PROBABLY WANT TO CHANGE THESE
#ifdef __linux__
#   define DEFAULT_FONT "/usr/share/fonts/truetype/arial.ttf"
#endif
#ifdef __APPLE_CC__
#   define DEFAULT_FONT "/usr/X11R6/lib/X11/fonts/TTF/Vera.ttf"
#endif
#ifdef _WIN32
#   define DEFAULT_FONT "C:\\WINNT\\Fonts\\arial.ttf"
#endif


void
my_init(const char* font_filename)
{
    glClearColor(0.0, 0.0, 0.0, 0.0);
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);

    fonts[0] = new FTOutlineFont(font_filename);
    fonts[1] = new FTPolygonFont(font_filename);
    fonts[2] = new FTTextureFont(font_filename);
    fonts[3] = new FTBitmapFont(font_filename);
    fonts[4] = new FTPixmapFont(font_filename);
    for (int i=0; i< 5; i++)
    {
        if (fonts[i]->Error())
        {
            std::cerr << "ERROR: Unable to open file " << font_filename << std::endl;
        }
        else
        {
            std::cout << "Reading font " << i << " from " << font_filename << std::endl;

            int point_size = 48;
            if (!fonts[i]->FaceSize(point_size))
            {
                std::cerr << "ERROR: Unable to set font face size " << point_size << std::endl;
            }
        }
    }
}

static void
do_ortho()
{
    int w;
    int h;
    GLdouble size;
    GLdouble aspect;

    w = width;
    h = height;
    aspect = (GLdouble)w / (GLdouble)h;

    // Use the whole window.
    glViewport(0, 0, w, h);

    // We are going to do some 2-D orthographic drawing.
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    size = (GLdouble)((w >= h) ? w : h) / 2.0;
    if (w <= h) {
        aspect = (GLdouble)h/(GLdouble)w;
        glOrtho(-size, size, -size*aspect, size*aspect,
                -100000.0, 100000.0);
    }
    else {
        aspect = (GLdouble)w/(GLdouble)h;
        glOrtho(-size*aspect, size*aspect, -size, size,
                -100000.0, 100000.0);
    }

    // Make the world and window coordinates coincide so that 1.0 in
    // model space equals one pixel in window space.
    glScaled(aspect, aspect, 1.0);

    // Now determine where to draw things.
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}


void
my_reshape(int w, int h)
{
    width = w;
    height = h;

    do_ortho();
}

void
my_handle_key(unsigned char key, int x, int y)
{
    switch (key) {
        case 'q':   // Esc or 'q' Quits the program.
        case 27:
        {
            for (int i=0; i<5; i++) {
                if (fonts[i]) {
                    delete fonts[i];
                    fonts[i] = 0;
                }
            }
            exit(1);
        }
            break;
        default:
            break;
    }
}

void
draw_scene()
{
    /* Set up some strings with the characters to draw. */
    unsigned int count = 0;
    char string[8][256];
    int i;
    for (i=1; i < 32; i++) { /* Skip zero - it's the null terminator! */
        string[0][count] = i;
        count++;
    }

    string[0][count] = '\0';

    count = 0;
    for (i=32; i < 64; i++) {
        string[1][count] = i;
        count++;
    }
    string[1][count] = '\0';

    count = 0;
   for (i=64; i < 96; i++) {
      string[2][count] = i;
      count++;
   }
   string[2][count] = '\0';

   count = 0;
   for (i=96; i < 128; i++) {
      string[3][count] = i;
      count++;
   }
   string[3][count] = '\0';

   count = 0;
   for (i=128; i < 160; i++) {
      string[4][count] = i;
      count++;
   }
   string[4][count] = '\0';

   count = 0;
   for (i=160; i < 192; i++) {
      string[5][count] = i;
      count++;
   }
   string[5][count] = '\0';

   count = 0;
   for (i=192; i < 224; i++) {
      string[6][count] = i;
      count++;
   }
   string[6][count] = '\0';

   count = 0;
   for (i=224; i < 256; i++) {
      string[7][count] = i;
      count++;
   }
   string[7][count] = '\0';


   glColor3f(1.0, 1.0, 1.0);

   for (int font = 0; font < 5; font++) {
       GLfloat x = -250.0;
       GLfloat y;
       GLfloat yild = 20.0;
       for (int j=0; j<4; j++) {
           y = 275.0-font*120.0-j*yild;
           if (font >= 3) {
               glRasterPos2f(x, y);
               fonts[font]->Render(string[j]);
           }
           else {
               if (font == 2) {
                   glEnable(GL_TEXTURE_2D);
                   glEnable(GL_BLEND);
                   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
               }
               glPushMatrix(); {
                   glTranslatef(x, y, 0.0);
                   fonts[font]->Render(string[j]);
               } glPopMatrix();
               if (font == 2) {
                   glDisable(GL_TEXTURE_2D);
                   glDisable(GL_BLEND);
               }
           }
       }
   }
}


void
my_display(void)
{
    glClear(GL_COLOR_BUFFER_BIT);

    draw_scene();

    glutSwapBuffers();
}


void
my_idle()
{
    glutPostRedisplay();
}

int
file_exists(const char * fontFilePath)
{
    FILE * fp = fopen(fontFilePath, "r");

    if (fp == NULL)
    {
        // That fopen failed does _not_ definitely mean the file isn't there
        // but for now this is ok
        return 0;
    }
    fclose(fp);
    return 1;
}

void
usage(const char * program)
{
    std::cerr << "Usage: " << program << " <fontFilePath.ttf>\n" << std::endl;
}

int
main(int argc, char **argv)
{
    char * fontFilePath;

    glutInitWindowSize(600, 600);
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE);

    glutCreateWindow("FTGL demo");

    if (argc >= 2)
    {
        if (!file_exists(argv[ 1 ]))
        {
            usage(argv[ 0 ]);
            std::cerr << "Couldn't open file '" << argv[ 1 ] << "'" << std::endl;
            exit(-1);
        }
        fontFilePath = argv[ 1 ];
    }
    else
    {
        // try a default font
        fontFilePath = DEFAULT_FONT;

        if (!file_exists(fontFilePath))
        {
            usage(argv[ 0 ]);
            std::cerr << "Couldn't open default file '" << fontFilePath << "'" << std::endl;
            exit(-1);
        }
    }

    my_init(fontFilePath);

    glutDisplayFunc(my_display);
    glutReshapeFunc(my_reshape);
    glutIdleFunc(my_idle);
    glutKeyboardFunc(my_handle_key);

    glutMainLoop();

    for(int x = 0; x < 5; ++x)
    {
        delete fonts[x];
    }

    return 0;
}