exposurses

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Comment:Implement exposure equations and matching for Aperture menu

Also: More evidence I am in a continual half-daze

- Need to define shutter value as double in `aperture` as otherwise both
arguments will be integers and I'm guessing it'd not going to work out
well. Plus... need to use `fraction_to_double` anyway to feed the
value in.
- Had done the "substring" thing wrong in `strncpy` and was one decimal
place off in getting the paerture value. I.e. would have got "1."
instead of "1.4" from "f/1.4"
- Like the fool I am, in the loop and the copy and paste I'd done, I'd
not changed from `aperture_array[0]` to `aperture_array[n]`

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SHA3-256: 845d8653eb0ee84fea90f0555b9c8341900615bdba99c82047d7d836d4bf287f
User & Date: base@atomicules.co.uk 2013-09-02 10:20:03
Context
2013-09-02
13:27
Enable exit key, change help text to suit check-in: 2dc1212485 user: base@atomicules.co.uk tags: origin/master, trunk
10:20
Implement exposure equations and matching for Aperture menu

Also: More evidence I am in a continual half-daze

- Need to define shutter value as double in `aperture` as otherwise both
arguments will be integers and I'm guessing it'd not going to work out
well. Plus... need to use `fraction_to_double` anyway to feed the
value in.
- Had done the "substring" thing wrong in `strncpy` and was one decimal
place off in getting the paerture value. I.e. would have got "1."
instead of "1.4" from "f/1.4"
- Like the fool I am, in the loop and the copy and paste I'd done, I'd
not changed from `aperture_array[0]` to `aperture_array[n]` check-in: 845d8653eb user: base@atomicules.co.uk tags: origin/master, trunk

09:47
I am King of Fail

I mean, just how? I think I need a few years more sleep or something check-in: 506ba48833 user: base@atomicules.co.uk tags: origin/master, trunk

Changes
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Changes to exposurses.c. 

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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);
/* No one will ever need more than 9 bytes! */
char iso_sel[9] = "";
char shutter_sel[9] = "";
char aperture_sel[9] = "";
int menu_counter = 1;
................................................................................
						set_menu_pattern(iso_menu, "200");
						/* 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(exposure(atoi(iso_sel)), strtod(aperture_sel_, NULL)),
................................................................................
							)]
						);
						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;
					strcpy(iso_sel, "");
................................................................................
}

double shutter (int exposure, double aperture) {
	/* EV = log2 (N^2/t) */
	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;
................................................................................
		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 = fabs(array_value_db - x);
	/* lots of repetition here but pointers to arrays seem to be a bad thing */
	switch(menu) {
		case 1:
................................................................................
					diff_idx = n;
					diff = fabs(array_value_db - x);
				}
			}
			break;
		case 3:
			for ( n = 1; aperture_array[n] != NULL; ++n ) {
				strncpy(array_value_str, aperture_array[0]+2, 3);
				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;








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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, 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 iso_sel[9] = "";
char shutter_sel[9] = "";
char aperture_sel[9] = "";
int menu_counter = 1;
................................................................................
						set_menu_pattern(iso_menu, "200");
						/* 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) {

						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(exposure(atoi(iso_sel)), strtod(aperture_sel_, NULL)),
................................................................................
							)]
						);
						menu_driver(shutter_menu, REQ_DOWN_ITEM);
						menu_driver(shutter_menu, REQ_UP_ITEM);
						wrefresh(shutter_win);
					}
					if (strcmp("", aperture_sel) == 0) {
						set_menu_pattern(
							aperture_menu,
							aperture_array[nearest_match(
								aperture(exposure(atoi(iso_sel)), fraction_to_double(shutter_sel)),
								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;
					strcpy(iso_sel, "");
................................................................................
}

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

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;
................................................................................
		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, 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 1:
................................................................................
					diff_idx = n;
					diff = fabs(array_value_db - x);
				}
			}
			break;
		case 3:
			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;

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