exposurses

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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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SHA3-256: 6513b427e7cb2d6191054029b8a73724a11be100601d6317c34b2a9d480a3ce3
User & Date: base@atomicules.co.uk 2013-08-29 23:24:17
Context
2013-08-31
07:47
Remove extraneous line that came from menu_scroll.c check-in: ed161d4179 user: base@atomicules.co.uk tags: origin/master, trunk
2013-08-29
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

2013-08-27
12:00
Fix order of arguements in exposure functions check-in: c663824d67 user: base@atomicules.co.uk tags: origin/master, trunk
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Changes to exposurses.c.

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char *iso_array[] = {
	"50",
	"100",
	"200",
	"400",
	"800",
	"1600",
	"3200"
	"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"
	"1",
	NULL
};

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

ITEM **iso_items;
ITEM **shutter_items;
ITEM **aperture_items;
MENU *iso_menu;
MENU *shutter_menu;
MENU *aperture_menu;
WINDOW *iso_win;
WINDOW *shutter_win;
WINDOW *aperture_win;

void selection(char *name);
void print_in_middle(WINDOW *win, int starty, int startx, int width, char *string, chtype color);
int exposure(int iso);
int selection_counter;
double shutter(int exposure, double aperture);
double aperture(int exposure, int shutter);
int nearest_match(double x, int menu);
double fraction_to_double(char *fraction);

char iso_sel[5] = "";
char shutter_sel[7] = "";
char aperture_sel[6] = "";
int menu_counter = 1;

int main() {
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				}
				if (menu_counter != menu_sel_last)
					 selection_counter += 1;
				if (selection_counter == 2) { 
					/* calculate the other menu */
					/* how to get missing menu? */
					if (strcmp("", iso_sel) == 0) {
						/* Test searching for item in menu */
						set_menu_pattern(iso_menu, "200");

						/* Test setting item in menu
							set_top_row(iso_menu, 3);
						/* This works, but plain refreshing doesn't work properly */
						/* But cheating and using menu_driver to go up/down does */
						/* Using menu_driver to go up/down to force refresh */
						menu_driver(iso_menu, REQ_DOWN_ITEM);
						menu_driver(iso_menu, REQ_UP_ITEM);
						wrefresh(iso_win);
					}
					if (strcmp("", shutter_sel) == 0) {
						/* Test finding nearest matching value in array? */
						char aperture_sel_[4] = "";
						strncpy(aperture_sel_, aperture_sel+2, 3);
						/* There is probably a nicer way to format the below */
						set_menu_pattern(
							shutter_menu,
							shutter_array[nearest_match(
								shutter(aperture_sel_, exposure(iso_sel)),
								2
							)]
						);
						set_top_row(shutter_menu, 3);
						menu_driver(shutter_menu, REQ_DOWN_ITEM);
						menu_driver(shutter_menu, REQ_UP_ITEM);
						wrefresh(shutter_win);
					}
					if (strcmp("", aperture_sel) == 0) {
						/* Tests setting to row number */
						set_top_row(aperture_menu, 3);
						menu_driver(aperture_menu, REQ_DOWN_ITEM);
						menu_driver(aperture_menu, REQ_UP_ITEM);
						wrefresh(aperture_win);
					}
					/* clear the selections for next time */
					selection_counter = 0;
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	return pow(aperture, 2) / pow(2, exposure);
}

double aperture (int exposure, int 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[7];
	double array_value_db;
	double diff;

	/* Need a starting value for difference */
	switch(menu) {
		case 1:
			array_value_db = strtod(iso_array[0], NULL);
			break;
		case 2:
			array_value_db = fraction_to_double(shutter_array[0]);
			break;
		case 3:
			strncpy(array_value_str, aperture_array[0]+2, 3);
			array_value_db = strtod(array_value_str, NULL);
			break;
	}
	diff = abs(array_value_db - x);
	/* lots of repetition here but pointers to arrays seem to be a bad thing */
	switch(menu) {
		case 1:
			for ( n = 1; iso_array[n] != NULL; ++n ) {
				array_value_db = strtod(iso_array[n], NULL);
				if (abs(array_value_db - x) < diff) { 
					diff_idx = n;
					diff = abs(array_value_db - x);
				}
			}
			break;
		case 2:
			for ( n = 1; iso_array[n] != NULL; ++n ) {
				array_value_db = fraction_to_double(shutter_array[n]);
				if (abs(array_value_db - x) < diff) {
					diff_idx = n;
					diff = abs(array_value_db - x);
				}
			}
			break;
		case 3:
			for ( n = 1; iso_array[n] != NULL; ++n ) {
				strncpy(array_value_str, aperture_array[0]+2, 3);
				array_value_db = strtod(array_value_str, NULL);
				if (abs(array_value_db - x) < diff) { 
					diff_idx = n;
					diff = abs(array_value_db - x);
				}
			}
			break;
	}
	return diff_idx;
}

double fraction_to_double(char *fraction) {
	double fraction_as_db;
	char denominator[5];
	char *ptr = strchr(fraction, "/");

	if (ptr) {
		/*then split*/
		strncpy(denominator, fraction+2, 5);
		fraction_as_db = 1/strtod(denominator, NULL);
	}
	else {
		fraction_as_db = strtod(fraction, NULL);
	}
return fraction_as_db;
}

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