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This thread is locked; no one can reply to it.
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| al_load_bitmap question |
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Scooter
Member #16,799
January 2018
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Hi all: |
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DanielH
Member #934
January 2001
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Make a generic text box with a string. Add letters/numbers if typed. Handle backspace and others. When does enter, use to load bitmap. |
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Scooter
Member #16,799
January 2018
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Hi Daniel: |
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DanielH
Member #934
January 2001
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What buffer? The key buffer or an actual string? Can't you use that to load the bitmap? |
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Scooter
Member #16,799
January 2018
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Hi Daniel: |
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DanielH
Member #934
January 2001
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Just use it. If buf contains a valid filename then just plug it in. As long as you have the image addon installed. ALLEGRO_BITMAP* bitmap = al_load_bitmap(buf);
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Scooter
Member #16,799
January 2018
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Daniel: Comment out the sprintf, it does not work. printf command shows buf contains the right info. |
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DanielH
Member #934
January 2001
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Code tags please. Saves me downloading a file. 1al_ustr_to_buffer(str, buf, 50);
2
3//add this line. What's the output?
4printf("%s", al_cstr(str));
5
6printf("%s", buf);
7
8sprintf(buf, "maggie.jpg");
9
10ALLEGRO_BITMAP* image = al_load_bitmap(buf);
11
12if(!image)
13{
14 fprintf(stderr,"Couldn't display image!\n");
15 return -1;
16}
Print your str variable. If it valid? Have you tried al_cstr? Just my guess, but I would say your str is not valid or garbage. How are you adding characters? |
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Scooter
Member #16,799
January 2018
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Hi Daniel: For some reason al_load_bitmap(); is not picking up the info from buf. Have a great day! |
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DanielH
Member #934
January 2001
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Can you post the entire file? |
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Scooter
Member #16,799
January 2018
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Hi Daniel: I will be back later! |
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Dizzy Egg
Member #10,824
March 2009
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As always, Allegro 5 doesn’t suck, but you don’t want to post all of your code, and I don’t know why. We are here to help you and show you why your code doesn’t work, but you won’t show use your code, so we cannot help you. I just tried using an allegro ustr, copied to a char buffer, and used it to load an image using al_load_bitmap, works fine. Allegro 5 doesn’t suck, your code sucks. 👍
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DanielH
Member #934
January 2001
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No, post what you already had. Let's take a look and see what the snag could be. |
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Scooter
Member #16,799
January 2018
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Hi Dizzy: Have a great day! |
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DanielH
Member #934
January 2001
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Linux or Microsoft, it doesn't matter. It's all C (or maybe C++) code. No one is going to kick you off this site. Unless you start speaking leet. That trend can stay gone! And when he says your code sucks, he means it in the nicest way. We joke around here. This site is pretty casual. Don't be afraid to ask. We only want to see the code because we're guessing otherwise. You originally asked about a problem loading bitmaps. After some digging and code posting, we figured your actual problem was more about UTF8 string conversion to char string. The section you posted is fine. There has got to be something else in your code and that's why we would like to see more of the code. |
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Scooter
Member #16,799
January 2018
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Hi Daniel: How to use code tags. |
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Dizzy Egg
Member #10,824
March 2009
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Hey Scooter, it’s all good only joking around, lots of my code sucks!! When you want to post code, put it in <code></code> tags, and it will format it. If you click formatting help when writing a post/reply it will show you how to use the various tags. I think the most important part of your code to see is how you take the text entry and put it into the ustr, then we should be able to see why it’s not working correctly.
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DanielH
Member #934
January 2001
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Just the code please. If it's not too big. There is a post limit. |
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Scooter
Member #16,799
January 2018
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1#include <allegro5/allegro.h>
2#include <allegro5/allegro_primitives.h>
3#include <allegro5/allegro_image.h>
4#include <stdio.h>
5#include <stdlib.h>
6#include <allegro5/allegro_font.h>
7#include <allegro5/allegro_ttf.h>
8#include <math.h>
9#include <string.h>
10#include <stdbool.h>
11
12#define PI 3.1415927
13
14float screen_height = 720;
15float working_screen_height = 690;
16float screen_width = 1280;
17float image_height;
18float image_width;
19float scale_factor;
20float dist;
21float bitmap_x = 640;
22float bitmap_y = 345;
23
24bool done = false;
25bool redraw = false;
26bool mouse_down = false;
27bool mouse_in_box = false;
28bool resizing = false;
29bool move_bitmap = false;
30bool lp = false; // flag to open a file
31int box_x1 = 1085;
32int box_y1 = 691;
33int box_x2 = 1210;
34int box_y2 = 720;
35
36float center_x = 640;
37float center_y = 345;
38
39int point_x, point_y;
40int pos_x,pos_y;
41int mouse_x, mouse_y;
42float angle = 0;
43int i;
44
45ALLEGRO_DISPLAY *display = NULL;
46ALLEGRO_BITMAP *image = NULL;
47ALLEGRO_BITMAP *image1 = NULL;
48ALLEGRO_BITMAP *image2 = NULL;
49ALLEGRO_BITMAP *image3 = NULL;
50ALLEGRO_BITMAP *zoom_image = NULL;
51ALLEGRO_BITMAP *temp_image = NULL;
52
53char buf[50];
54
55//void draw_menu();
56int draw_default_size();
57int draw_full_screen();
58void zoom_created_image();
59void rotate_image();
60void load_image();
61
62int main()
63 {
64 //ALLEGRO_DISPLAY *display = NULL;
65 ALLEGRO_TIMER *timer;
66 ALLEGRO_EVENT_QUEUE *event_queue = NULL;
67
68 if(!al_init())
69 {
70 fprintf(stderr,"Couldn't initialize allegro!\n");
71 return -1;
72 }
73
74 if(!al_install_mouse())
75 {
76 fprintf(stderr, "failed to initialize the mouse!\n");
77 return -1;
78 }
79
80 if(!al_init_primitives_addon())
81 {
82 fprintf(stderr,"Couldn't initialize primitives addon!\n");
83 return -1;
84 }
85
86 if(!al_install_mouse())
87 {
88 fprintf(stderr, "failed to initialize the mouse!\n");
89 return -1;
90 }
91
92 display = al_create_display(screen_width, screen_height);
93
94 if(!display)
95 {
96 fprintf(stderr,"Couldn't create allegro display!\n");
97 return -1;
98 }
99
100 if(!al_init_image_addon())
101 {
102 fprintf(stderr,"Couldn't display image!\n");
103 return -1;
104 }
105
106 al_install_keyboard();
107
108 al_init_font_addon();
109 al_init_ttf_addon();
110
111 timer = al_create_timer(1.0 / 60);
112
113 event_queue = al_create_event_queue();
114
115 al_register_event_source(event_queue, al_get_display_event_source(display));
116 al_register_event_source(event_queue, al_get_mouse_event_source());
117 al_register_event_source(event_queue, al_get_timer_event_source(timer));
118 al_register_event_source(event_queue, al_get_keyboard_event_source());
119
120 ALLEGRO_USTR* input = al_ustr_new(" ");
121 int pos = (int)al_ustr_size(input);
122 ALLEGRO_FONT *font16 = al_load_font("DroidSerif-Bold.ttf" , 16, 0);
123
124 al_clear_to_color(al_map_rgb(20, 20, 20));
125 // for better quality
126 // al_set_new_bitmap_flags(ALLEGRO_MIN_LINEAR | ALLEGRO_MAG_LINEAR);
127 image = al_load_bitmap("mountain.png");
128 image1 = al_load_bitmap("menu.png");
129 image2 = al_load_bitmap("blank.png");
130
131 if(!image)
132 {
133 fprintf(stderr,"Couldn't display image!\n");
134 return -1;
135 }
136
137 image_height = al_get_bitmap_height(image);
138 image_width = al_get_bitmap_width(image);
139 al_draw_bitmap(image, (screen_width - image_width) / 2, (working_screen_height - image_height) / 2, 0);
140
141 al_draw_bitmap(image1, 0, 690, 0);
142 // draw_menu();
143 al_flip_display();
144/*
145 // for reference only
146 al_draw_scaled_bitmap(King,
147 0, 0,
148 al_get_bitmap_width(King), al_get_bitmap_height(King),
149 x_position, y_position,
150 scaled_width, scaled_height,
151 0);
152*/
153 al_start_timer(timer);
154
155 int done = false;
156
157 while(!done)
158 {
159 ALLEGRO_EVENT ev;
160 al_wait_for_event(event_queue, &ev);
161 if (ev.type == ALLEGRO_EVENT_DISPLAY_CLOSE)
162 {
163 done = true;
164 }
165
166 if(ev.type == ALLEGRO_EVENT_KEY_DOWN)
167 {
168 switch(ev.keyboard.keycode)
169 {
170 case ALLEGRO_KEY_ESCAPE:
171 done = true;
172 break;
173
174 case ALLEGRO_KEY_LEFT:
175 bitmap_x -= 40;
176 zoom_created_image();
177 break;
178
179 case ALLEGRO_KEY_RIGHT:
180 bitmap_x += 40;
181 zoom_created_image();
182 break;
183
184 case ALLEGRO_KEY_UP:
185 bitmap_y -= 40;
186 zoom_created_image();
187 break;
188
189 case ALLEGRO_KEY_DOWN:
190 bitmap_y += 40;
191 zoom_created_image();
192 break;
193 }
194 }
195
196 if(ev.type == ALLEGRO_EVENT_KEY_CHAR)
197 {
198 if(ev.keyboard.unichar >= 32 && ev.keyboard.unichar <= 127)
199 {
200 // al_ustr_append_chr(input, ev.keyboard.unichar);
201 pos += al_ustr_append_chr(input, ev.keyboard.unichar);
202 al_draw_ustr(font16, al_map_rgb(255,255,255), 175, 696, ALLEGRO_ALIGN_LEFT, input);
203 al_flip_display();
204 }
205 else if(ev.keyboard.keycode == ALLEGRO_KEY_BACKSPACE)
206 {
207 if(al_ustr_prev(input, &pos))
208 {
209 al_ustr_truncate(input, pos);
210
211 al_draw_bitmap(image2, 0, 690, 0);
212 al_draw_text(font16, al_map_rgb(255,255,0), 10 , 696 ,0 ,"Enter File To OPEN:");
213 al_draw_ustr(font16, al_map_rgb(255,255,255), 175, 696, ALLEGRO_ALIGN_LEFT, input);
214 al_flip_display();
215 }
216 }
217
218 else if(ev.keyboard.keycode == ALLEGRO_KEY_ENTER)
219 {
220 al_ustr_to_buffer(input, buf, 50);
221
222 printf("%s\n", buf);
223 printf("%s", al_cstr(input));
224
225 // sprintf(buf, "maggie.jpg");
226
227 // ALLEGRO_BITMAP*
228 image = al_load_bitmap(buf);
229
230 if(!image)
231 {
232 fprintf(stderr,"Couldn't display image!\n");
233 return -1;
234 }
235
236 image_height = al_get_bitmap_height(image);
237 image_width = al_get_bitmap_width(image);
238 al_clear_to_color(al_map_rgb(0,0,0));
239 al_draw_bitmap(image1, 0, 690, 0);
240 al_draw_bitmap(image, (screen_width - image_width) / 2, (working_screen_height - image_height) / 2, 0);
241 al_flip_display();
242 }
243
244 }
245
246 else if(ev.type == ALLEGRO_EVENT_TIMER)
247 {
248 redraw = true;
249 if ((mouse_x >= box_x1 && mouse_x <= box_x2) && (mouse_y >= box_y1 && mouse_y <= box_y2))
250 {
251 mouse_in_box = true;
252 }
253 else
254 {
255 mouse_in_box = false;
256 resizing = false;
257 }
258 }
259
260 else if(ev.type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN && ev.mouse.button == 1)
261
262 {
263 mouse_down = true;
264
265 if (mouse_in_box)
266 {
267 resizing = true;
268 }
269 else
270 {
271 resizing = false;
272 }
273 }
274
275 else if(ev.type == ALLEGRO_EVENT_MOUSE_BUTTON_UP && ev.mouse.button == 1)
276
277 {
278 mouse_down = false;
279 resizing = false;
280 }
281
282 else if(ev.type == ALLEGRO_EVENT_MOUSE_AXES)
283
284 {
285 mouse_x = ev.mouse.x; // get present mouse position
286 mouse_y = ev.mouse.y;
287
288 if(resizing)
289 {
290 image_height = al_get_bitmap_height(image);
291 image_width = al_get_bitmap_width(image);
292 al_clear_to_color(al_map_rgb(0,0,0));
293 al_draw_bitmap(image1, 0, 690, 0);
294 // draw_menu();
295 scale_factor = working_screen_height / image_height;
296 dist = mouse_x - 1085;
297 scale_factor = scale_factor * (dist / 127); // ratio image height/length of rectangle
298 al_draw_scaled_bitmap(image,
299 0, 0, image_width, image_height,
300 (screen_width - (scale_factor * image_width)) / 2.0, // final x position
301 ((working_screen_height - scale_factor * image_height) / 2.0), // final y position
302 image_width * scale_factor, image_height * scale_factor, 0);
303 al_flip_display(); // let's see it on screen
304
305 }
306
307 }
308
309 if(ev.type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN)
310 {
311 if( ev.mouse.button == 1)
312 {
313 pos_x = ev.mouse.x;
314 pos_y = ev.mouse.y;
315 if ((pos_x > 1220 && pos_x < 1285) && (pos_y > 685 && pos_y < 720))
316 {
317 done = true; /* EXIT */
318 break;
319 }
320 }
321 }
322
323 if(ev.type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN)
324 {
325 if( ev.mouse.button == 1)
326 {
327 if ((pos_x > 989 && pos_x < 1075) && (pos_y > 685 && pos_y < 720))
328 {
329 draw_default_size(); /* DEFAULT SIZE */
330 }
331
332 if ((pos_x > 861 && pos_x < 970) && (pos_y > 685 && pos_y < 720))
333 {
334 draw_full_screen(); /* fullscreen */
335 }
336
337 if ((pos_x > 720 && pos_x < 845) && (pos_y > 685 && pos_y < 720))
338 {
339 rotate_image(); /* rotate image ? degrees right */
340 }
341
342 if ((pos_x > 632 && pos_x < 700) && (pos_y > 685 && pos_y < 720)) //ZOOM IMAGE
343 {
344 zoom_created_image();
345 }
346
347 if ((pos_x > 8 && pos_x < 60) && (pos_y > 685 && pos_y < 720)) //LOAD IMAGE
348 {
349 load_image();
350 }
351 }
352
353 }
354
355 }
356
357 /* al_rest(10.0); */
358
359 // clean up system on exit
360 al_destroy_display(display);
361 al_destroy_bitmap(image);
362 al_destroy_bitmap(image1);
363 al_destroy_timer(timer);
364 al_destroy_event_queue(event_queue);
365 return 0;
366 }
367
368
369// for reference only use image1 instead
370void draw_menu()
371 {
372 ALLEGRO_FONT *font16 = al_load_font("DroidSerif-Bold.ttf" , 16, 0);
373
374 al_draw_filled_rectangle(0, 690, 1280, 720, al_map_rgb(0, 0, 255));
375 al_draw_filled_rectangle(1085, 690, 1210, 720, al_map_rgb(255, 255, 0));
376
377 al_draw_text( font16, al_map_rgb(255,255,0), 10 , 696 ,0 ,"OPEN");
378 al_draw_text( font16, al_map_rgb(255,255,0), 70 , 696 ,0 ,"SAVE");
379
380 al_draw_text( font16, al_map_rgb(255,255,0), 718 , 696 ,0 ,"ROTATE-RIGHT");
381 al_draw_text( font16, al_map_rgb(255,255,0), 632 , 696 ,0 ,"MIRROR");
382 al_draw_text( font16, al_map_rgb(255,255,0), 861 , 696 ,0 ,"FULLSCREEN");
383 al_draw_text( font16, al_map_rgb(255,255,0), 989 , 696 ,0 ,"DEFAULT");
384 al_draw_text( font16, al_map_rgb(255,255,0), 1225 , 696 ,0 ,"QUIT");
385 }
386
387void rotate_image()
388 {
389 angle = (90.0 * PI) / 180.0;
390 image_height = al_get_bitmap_height(image);
391 image_width = al_get_bitmap_width(image);
392 al_clear_to_color(al_map_rgb(0,0,0));
393 al_draw_bitmap(image1, 0, 690, 0);
394
395 al_draw_rotated_bitmap(image, image_width / 2.0, image_height / 2.0,
396 screen_width / 2.0, working_screen_height / 2.0, angle, 0);
397
398 al_flip_display();
399
400 }
401
402void load_image()
403 {
404 ALLEGRO_FONT *font16 = al_load_font("DroidSerif-Bold.ttf" , 16, 0);
405 al_draw_bitmap(image2, 0, 690, 0);
406 al_draw_text( font16, al_map_rgb(255,255,0), 10 , 696 ,0 ,"Enter File To OPEN:");
407 al_flip_display();
408
409 // al_draw_bitmap(image1, 0, 690, 0);
410 // al_flip_display();
411 }
412
413 void zoom_created_image()
414 {
415 image_height = al_get_bitmap_height(image);
416 image_width = al_get_bitmap_width(image);
417 scale_factor = 4.0; //??????
418 // bitmap_x = (screen_width - (scale_factor * image_width)) / 2.0;
419 // bitmap_y = ((working_screen_height - scale_factor * image_height) / 2.0);
420
421 al_clear_to_color(al_map_rgb(0,0,0));
422 al_draw_bitmap(image1, 0, 690, 0);
423
424 dist = mouse_x - 1085;
425 al_draw_scaled_bitmap(image,
426 0, 0, image_width, image_height, bitmap_x - (image_width * 2.0), bitmap_y - (image_height * 2.0),
427 image_width * scale_factor, image_height * scale_factor, 0);
428 al_draw_bitmap(image1, 0, 690, 0); // menu at screen bottom
429 al_flip_display(); // let's see it on screen
430 }
431
432int draw_default_size()
433 {
434 image_height = al_get_bitmap_height(image);
435 image_width = al_get_bitmap_width(image);
436 al_clear_to_color(al_map_rgb(20, 20, 20));
437 // draw_menu();
438 al_draw_bitmap(image1, 0, 690, 0);
439 scale_factor = 1.0;
440 al_draw_bitmap(image, (screen_width - image_width) / 2, (working_screen_height - image_height) / 2, 0);
441 // al_draw_circle(screen_width / 2, working_screen_height / 2, 5, al_map_rgb(255,0,0), 2);
442 al_flip_display();
443 }
444
445int draw_full_screen()
446 {
447 image_height = al_get_bitmap_height(image);
448 image_width = al_get_bitmap_width(image);
449 al_clear_to_color(al_map_rgb(20, 20, 20));
450 // draw_menu();
451 al_draw_bitmap(image1, 0, 690, 0);
452
453 scale_factor = working_screen_height / image_height;
454 al_draw_scaled_bitmap(image,
455 0, 0, image_width, image_height,
456 (screen_width - (scale_factor * image_width)) / 2.0, ((scale_factor / image_height) / 2.0),
457 image_width * scale_factor, image_height * scale_factor, 0);
458
459 al_flip_display();
460 }
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Dizzy Egg
Member #10,824
March 2009
|
Could it be that when you call al_ustr_new(” ”) you create it with a space? Have you tried calling al_ustr_new(””) without the space? It may be that even though the string looks ok it actually had a space in front of it?
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Scooter
Member #16,799
January 2018
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Hi Dizzy: Great job guys! Thanks! edit: |
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DanielH
Member #934
January 2001
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Remove the space. |
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Scooter
Member #16,799
January 2018
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Hi Daniel: I did remove the space and now it works perfect. Great job guys! Thanks! |
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Dizzy Egg
Member #10,824
March 2009
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It would have worked if your file was called “ maggie.jpg” and not “maggie.jpg” !!!
---------------------------------------------------- |
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DanielH
Member #934
January 2001
|
Could also do some overkill to avoid using string literals in your USTR creation. ALLEGRO_USTR* input = al_ustr_dup(al_ustr_empty_string()); some things to discuss 1. Before you load the updated image file, make sure you destroy the current image. 2. Not sure if these functions are getting called, but I saw a few times you load a font into font16; That should be loaded at the front. Once and done. Destroy when program close. 3. Make your life just a bit better and split this up into multiple functions. // my main 6 functions int init(); // intialize program, return -1 on any failure void shutdown(); // this frees any allocated memory void loop(); // main loop int input(); // ALL and only events are processed here. No logic. no drawing. return -1 on close request int logic(); // update anything based on the latest input status return -1 on any issue or program close request void draw(); // ONLY place things should be drawn in the entire program Check out my basic pp framework on Github It's C++, but can easily be made into C. If you're feeling ambitions, I made a simple TicTacToe game from the same framework code. Also on Github. See in the input section. I'm only updating variables from the events triggered. These variables are then processed in the logic section. Any update and it sets my dirty bool to true. which triggers a redraw. |
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