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Overview
| Comment: | Implement functionality to calc req'd and then sel nearest match in menu So far only implemented on Shutter menu, i.e. have to select ISO and Aperture, it will then use the equations to calculate the exact required shutter speed, but then select the nearest value in the menu. In order to do that added these two functions: - nearest_match - fraction_to_double The latter needed, because need to convert "1/1000", etc into float. For Aperture menu items can just strip off the "f/". Seems to work for Sunny 16. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | origin/master | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
6513b427e7cb2d6191054029b8a73724 |
| User & Date: | base@atomicules.co.uk 2013-08-29 23:24:17 |
Context
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2013-08-31
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| 07:47 | Remove extraneous line that came from menu_scroll.c check-in: ed161d4179 user: base@atomicules.co.uk tags: origin/master, trunk | |
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2013-08-29
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| 23:24 | Implement functionality to calc req'd and then sel nearest match in menu So far only implemented on Shutter menu, i.e. have to select ISO and Aperture, it will then use the equations to calculate the exact required shutter speed, but then select the nearest value in the menu. In order to do that added these two functions: - nearest_match - fraction_to_double The latter needed, because need to convert "1/1000", etc into float. For Aperture menu items can just strip off the "f/". Seems to work for Sunny 16. check-in: 6513b427e7 user: base@atomicules.co.uk tags: origin/master, trunk | |
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2013-08-27
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| 12:00 | Fix order of arguements in exposure functions check-in: c663824d67 user: base@atomicules.co.uk tags: origin/master, trunk | |
Changes
Changes to exposurses.c.
10 10 char *iso_array[] = { 11 11 "50", 12 12 "100", 13 13 "200", 14 14 "400", 15 15 "800", 16 16 "1600", 17 - "3200" 17 + "3200", 18 + NULL 18 19 }; 19 20 20 21 char *shutter_array[] = { 21 22 "1/1000", 22 23 "1/500", 23 24 "1/250", 24 25 "1/125", 25 26 "1/60", 26 27 "1/30", 27 28 "1/15", 28 29 "1/8", 29 30 "1/4", 30 31 "1/2", 31 - "1" 32 + "1", 33 + NULL 32 34 }; 33 35 34 36 char *aperture_array[] = { 35 37 "f/1.4", 36 38 "f/2", 37 39 "f/2.8", 38 40 "f/4", 39 41 "f/5.6", 40 42 "f/8", 41 43 "f/11", 42 - "f/16" 44 + "f/16", 45 + NULL 43 46 }; 44 47 45 48 ITEM **iso_items; 46 49 ITEM **shutter_items; 47 50 ITEM **aperture_items; 48 51 MENU *iso_menu; 49 52 MENU *shutter_menu; ................................................................................ 54 57 55 58 void selection(char *name); 56 59 void print_in_middle(WINDOW *win, int starty, int startx, int width, char *string, chtype color); 57 60 int exposure(int iso); 58 61 int selection_counter; 59 62 double shutter(int exposure, double aperture); 60 63 double aperture(int exposure, int shutter); 64 +int nearest_match(double x, int menu); 65 +double fraction_to_double(char *fraction); 61 66 62 67 char iso_sel[5] = ""; 63 68 char shutter_sel[7] = ""; 64 69 char aperture_sel[6] = ""; 65 70 int menu_counter = 1; 66 71 67 72 int main() { ................................................................................ 226 231 } 227 232 if (menu_counter != menu_sel_last) 228 233 selection_counter += 1; 229 234 if (selection_counter == 2) { 230 235 /* calculate the other menu */ 231 236 /* how to get missing menu? */ 232 237 if (strcmp("", iso_sel) == 0) { 238 + /* Test searching for item in menu */ 233 239 set_menu_pattern(iso_menu, "200"); 234 - 235 - /* Test setting item in menu 236 - set_top_row(iso_menu, 3); 237 - /* This works, but plain refreshing doesn't work properly */ 238 - /* But cheating and using menu_driver to go up/down does */ 240 + /* Using menu_driver to go up/down to force refresh */ 239 241 menu_driver(iso_menu, REQ_DOWN_ITEM); 240 242 menu_driver(iso_menu, REQ_UP_ITEM); 241 243 wrefresh(iso_win); 242 244 } 243 245 if (strcmp("", shutter_sel) == 0) { 246 + /* Test finding nearest matching value in array? */ 247 + char aperture_sel_[4] = ""; 248 + strncpy(aperture_sel_, aperture_sel+2, 3); 249 + /* There is probably a nicer way to format the below */ 250 + set_menu_pattern( 251 + shutter_menu, 252 + shutter_array[nearest_match( 253 + shutter(aperture_sel_, exposure(iso_sel)), 254 + 2 255 + )] 256 + ); 244 257 set_top_row(shutter_menu, 3); 245 258 menu_driver(shutter_menu, REQ_DOWN_ITEM); 246 259 menu_driver(shutter_menu, REQ_UP_ITEM); 247 260 wrefresh(shutter_win); 248 261 } 249 262 if (strcmp("", aperture_sel) == 0) { 263 + /* Tests setting to row number */ 250 264 set_top_row(aperture_menu, 3); 251 265 menu_driver(aperture_menu, REQ_DOWN_ITEM); 252 266 menu_driver(aperture_menu, REQ_UP_ITEM); 253 267 wrefresh(aperture_win); 254 268 } 255 269 /* clear the selections for next time */ 256 270 selection_counter = 0; ................................................................................ 326 340 return pow(aperture, 2) / pow(2, exposure); 327 341 } 328 342 329 343 double aperture (int exposure, int shutter) { 330 344 /* EV = log2 (N^2/t) */ 331 345 return sqrt(pow(2, exposure) * shutter); 332 346 } 347 + 348 +int nearest_match (double x, int menu) { 349 + /* Need to search array for closest match */ 350 + int n; 351 + int diff_idx = 0; 352 + char array_value_str[7]; 353 + double array_value_db; 354 + double diff; 355 + 356 + /* Need a starting value for difference */ 357 + switch(menu) { 358 + case 1: 359 + array_value_db = strtod(iso_array[0], NULL); 360 + break; 361 + case 2: 362 + array_value_db = fraction_to_double(shutter_array[0]); 363 + break; 364 + case 3: 365 + strncpy(array_value_str, aperture_array[0]+2, 3); 366 + array_value_db = strtod(array_value_str, NULL); 367 + break; 368 + } 369 + diff = abs(array_value_db - x); 370 + /* lots of repetition here but pointers to arrays seem to be a bad thing */ 371 + switch(menu) { 372 + case 1: 373 + for ( n = 1; iso_array[n] != NULL; ++n ) { 374 + array_value_db = strtod(iso_array[n], NULL); 375 + if (abs(array_value_db - x) < diff) { 376 + diff_idx = n; 377 + diff = abs(array_value_db - x); 378 + } 379 + } 380 + break; 381 + case 2: 382 + for ( n = 1; iso_array[n] != NULL; ++n ) { 383 + array_value_db = fraction_to_double(shutter_array[n]); 384 + if (abs(array_value_db - x) < diff) { 385 + diff_idx = n; 386 + diff = abs(array_value_db - x); 387 + } 388 + } 389 + break; 390 + case 3: 391 + for ( n = 1; iso_array[n] != NULL; ++n ) { 392 + strncpy(array_value_str, aperture_array[0]+2, 3); 393 + array_value_db = strtod(array_value_str, NULL); 394 + if (abs(array_value_db - x) < diff) { 395 + diff_idx = n; 396 + diff = abs(array_value_db - x); 397 + } 398 + } 399 + break; 400 + } 401 + return diff_idx; 402 +} 403 + 404 +double fraction_to_double(char *fraction) { 405 + double fraction_as_db; 406 + char denominator[5]; 407 + char *ptr = strchr(fraction, "/"); 408 + 409 + if (ptr) { 410 + /*then split*/ 411 + strncpy(denominator, fraction+2, 5); 412 + fraction_as_db = 1/strtod(denominator, NULL); 413 + } 414 + else { 415 + fraction_as_db = strtod(fraction, NULL); 416 + } 417 +return fraction_as_db; 418 +}