exposurses

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Comment:Add under/over exposure indication in to the shutter/aperture menus Keeping the NULLs in makes array indices very confusing, but this seems to be the right thing to do.
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SHA3-256: 7312ab2b6fc9fee492c9f7e8ed50abeef074a5051e38a8a3c9d5674f837df4f4
User & Date: base@atomicules.co.uk 2013-09-18 12:48:35
Context
2013-09-18
12:49
Ignore selection of OVER/UNDER in shutter/aperture menus Since this seems easier than trying to prevent selection. check-in: 4cc8e33f3c user: base@atomicules.co.uk tags: origin/master, trunk
12:48
Add under/over exposure indication in to the shutter/aperture menus Keeping the NULLs in makes array indices very confusing, but this seems to be the right thing to do. check-in: 7312ab2b6f user: base@atomicules.co.uk tags: origin/master, trunk
11:01
Fix menu numbering (from adding exposure menu in) Didn't change functionality (it was still working), but just gives better consistency to the code. check-in: 4a3cabadc2 user: base@atomicules.co.uk tags: origin/master, trunk
Changes
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Changes to exposurses.c. 

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	"800",
	"1600",
	"3200",
	NULL
};

char *shutter_array[] = {

	"1/1000",
	"1/500",
	"1/250",
	"1/125",
	"1/60",
	"1/30",
	"1/15",
	"1/8",
	"1/4",
	"1/2",
	"1",

	NULL
};

char *aperture_array[] = {

	"f/1.4",
	"f/2",
	"f/2.8",
	"f/4",
	"f/5.6",
	"f/8",
	"f/11",
	"f/16",

	NULL
};

ITEM **exposure_items;
ITEM **iso_items;
ITEM **shutter_items;
ITEM **aperture_items;
................................................................................
void remove_menu(ITEM **items, MENU *men, int n);
void print_in_middle(WINDOW *win, int starty, int startx, int width, char *string, chtype color);
MENU *add_menu(char **array, ITEM **items, int n);
WINDOW *add_window(int xpos, char *title);
int exposure(int iso);
double shutter(int exposure, double aperture);
double aperture(int exposure, double shutter);
int nearest_match(double x, int menu);
double fraction_to_double(char *fraction);
/* No one will ever need more than 9 bytes! */
char exposure_sel[9] = "";
char iso_sel[9] = "";
char shutter_sel[9] = "";
char aperture_sel[9] = "";
int selection_counter = 1;
................................................................................
							menu_driver(shutter_menu, REQ_SCR_UPAGE);
							menu_driver(shutter_menu, REQ_SCR_DPAGE);
							/* There is probably a nicer way to format the below */
							set_menu_pattern(
								shutter_menu,
								shutter_array[nearest_match(
									shutter(exposure(atoi(iso_sel)), strtod(aperture_sel_, NULL)),
									3

								)]
							);
							menu_driver(shutter_menu, REQ_DOWN_ITEM);
							menu_driver(shutter_menu, REQ_UP_ITEM);
							wrefresh(shutter_win);
						}
						if (strcmp("", aperture_sel) == 0) {
							menu_driver(aperture_menu, REQ_SCR_UPAGE);
							menu_driver(aperture_menu, REQ_SCR_DPAGE);
							set_menu_pattern(
								aperture_menu,
								aperture_array[nearest_match(
									aperture(exposure(atoi(iso_sel)), fraction_to_double(shutter_sel)),
									4

								)]
							);
							menu_driver(aperture_menu, REQ_DOWN_ITEM);
							menu_driver(aperture_menu, REQ_UP_ITEM);
							wrefresh(aperture_win);
						}
						/* clear the selections for next time */
................................................................................
}

double aperture (int exposure, double shutter) {
	/* EV = log2 (N^2/t) */
	return sqrt(pow(2, exposure) * shutter);
}

int nearest_match (double x, int menu) {
	/* Need to search array for closest match */
	int n;
	int diff_idx = 0;
	char array_value_str[9];
	double array_value_db;
	double diff;

	/* Need a starting value for difference */
	switch(menu) {
		case 3:
			array_value_db = fraction_to_double(shutter_array[0]);
			break;
		case 4:
			strncpy(array_value_str, aperture_array[0]+2, 4);
			array_value_db = strtod(array_value_str, NULL);
			break;
	}
	diff = fabs(array_value_db - x);
	/* lots of repetition here but pointers to arrays seem to be a bad thing */


	switch(menu) {
		case 3:
			for ( n = 1; shutter_array[n] != NULL; ++n ) {

				array_value_db = fraction_to_double(shutter_array[n]);
				if (fabs(array_value_db - x) < diff) {
					diff_idx = n;
					diff = fabs(array_value_db - x);
				}











			}
			break;
		case 4:
			for ( n = 1; aperture_array[n] != NULL; ++n ) {
				strncpy(array_value_str, aperture_array[n]+2, 4);
				array_value_db = strtod(array_value_str, NULL);
				if (fabs(array_value_db - x) < diff) { 
					diff_idx = n;
					diff = fabs(array_value_db - x);
				}
			}
















			break;
	}
	return diff_idx;
}

double fraction_to_double(char *fraction) {
	double fraction_as_db;








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	"800",
	"1600",
	"3200",
	NULL
};

char *shutter_array[] = {
	"OVER",
	"1/1000",
	"1/500",
	"1/250",
	"1/125",
	"1/60",
	"1/30",
	"1/15",
	"1/8",
	"1/4",
	"1/2",
	"1",
	"UNDER",
	NULL
};

char *aperture_array[] = {
	"UNDER",
	"f/1.4",
	"f/2",
	"f/2.8",
	"f/4",
	"f/5.6",
	"f/8",
	"f/11",
	"f/16",
	"OVER",
	NULL
};

ITEM **exposure_items;
ITEM **iso_items;
ITEM **shutter_items;
ITEM **aperture_items;
................................................................................
void remove_menu(ITEM **items, MENU *men, int n);
void print_in_middle(WINDOW *win, int starty, int startx, int width, char *string, chtype color);
MENU *add_menu(char **array, ITEM **items, int n);
WINDOW *add_window(int xpos, char *title);
int exposure(int iso);
double shutter(int exposure, double aperture);
double aperture(int exposure, double shutter);
int nearest_match(double x, int menu, int n_array);
double fraction_to_double(char *fraction);
/* No one will ever need more than 9 bytes! */
char exposure_sel[9] = "";
char iso_sel[9] = "";
char shutter_sel[9] = "";
char aperture_sel[9] = "";
int selection_counter = 1;
................................................................................
							menu_driver(shutter_menu, REQ_SCR_UPAGE);
							menu_driver(shutter_menu, REQ_SCR_DPAGE);
							/* There is probably a nicer way to format the below */
							set_menu_pattern(
								shutter_menu,
								shutter_array[nearest_match(
									shutter(exposure(atoi(iso_sel)), strtod(aperture_sel_, NULL)),
									3,
									n_shutter
								)]
							);
							menu_driver(shutter_menu, REQ_DOWN_ITEM);
							menu_driver(shutter_menu, REQ_UP_ITEM);
							wrefresh(shutter_win);
						}
						if (strcmp("", aperture_sel) == 0) {
							menu_driver(aperture_menu, REQ_SCR_UPAGE);
							menu_driver(aperture_menu, REQ_SCR_DPAGE);
							set_menu_pattern(
								aperture_menu,
								aperture_array[nearest_match(
									aperture(exposure(atoi(iso_sel)), fraction_to_double(shutter_sel)),
									4,
									n_aperture
								)]
							);
							menu_driver(aperture_menu, REQ_DOWN_ITEM);
							menu_driver(aperture_menu, REQ_UP_ITEM);
							wrefresh(aperture_win);
						}
						/* clear the selections for next time */
................................................................................
}

double aperture (int exposure, double shutter) {
	/* EV = log2 (N^2/t) */
	return sqrt(pow(2, exposure) * shutter);
}

int nearest_match (double x, int menu, int n_array) {
	/* Need to search array for closest match */
	int n;
	int diff_idx = 1;
	char array_value_str[9];
	double array_value_db;
	double diff;

	/* Need a starting value for difference */
	switch(menu) {
		case 3:
			array_value_db = fraction_to_double(shutter_array[1]);
			break;
		case 4:
			strncpy(array_value_str, aperture_array[1]+2, 4);
			array_value_db = strtod(array_value_str, NULL);
			break;
	}
	diff = fabs(array_value_db - x);
	/* lots of repetition here but pointers to arrays seem to be a bad thing */
	/* Could do from n = 3 (2 above) until != under/over
	 * but also need to do something like if diff is more than twice max/min then under/over */
	switch(menu) {
		case 3:

			for ( n = 2; n < n_array-2; ++n ) {
				array_value_db = fraction_to_double(shutter_array[n]);
				if (fabs(array_value_db - x) < diff) {
					diff_idx = n;
					diff = fabs(array_value_db - x);
				}
			}
			/* Check if at extremities and then if under/over exposed */
			if (diff_idx == 1) {
				if (diff >= fraction_to_double(shutter_array[1])/2) { /* diff is greater than diff of next one down minus max/min */
					diff_idx = 0;
				}
			}
			if (diff_idx == n_array-3) {
				if (diff >= fraction_to_double(shutter_array[n_array-3])*2) {
					diff_idx = n_array-2;	
				}
			}
			break;
		case 4:
			for ( n = 2; n < n_array-2; ++n ) {
				strncpy(array_value_str, aperture_array[n]+2, 4);
				array_value_db = strtod(array_value_str, NULL);
				if (fabs(array_value_db - x) < diff) { 
					diff_idx = n;
					diff = fabs(array_value_db - x);
				}
			}
			/* Apertures similarly. Although progression is fiddlier.*/
			if (diff_idx == 1) {
				strncpy(array_value_str, aperture_array[1]+2, 4);
				array_value_db = strtod(array_value_str, NULL);
				if (diff >= array_value_db/sqrt(2.0)) { /* diff is greater than diff of next one down minus max/min */
					diff_idx = 0;
				}
			}
			if (diff_idx == n_array-3) {
				strncpy(array_value_str, aperture_array[n_array-3]+2, 4);
				array_value_db = strtod(array_value_str, NULL);
				if (diff >= array_value_db*sqrt(2.0)) {
					diff_idx = n_array-2;	
				}
			}

			break;
	}
	return diff_idx;
}

double fraction_to_double(char *fraction) {
	double fraction_as_db;

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