ex_gui_colorwheel.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <allegro5/allegro_primitives.h>
#include "nilorea/n_common.h"
#include "nilorea/n_log.h"
#include "nilorea/n_gui.h"
#include "nilorea/n_gui_colorwheel.h"

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Macros
#define	ALLEGRO_UNSTABLE   1
#define	AT_X(u)
	the wheel sits at 50,50 and is 200 by 200, its disc of radius 98 centred at 150,150: display position of a wheel coordinate
#define	AT_Y(v)
	as AT_X, for v, which goes up

Functions
static void	drag (N_GUI_CTX *gui, float fu, float fv, float tu, float tv)
	press at one point, drag to another, release
static void	expect_true (const char *what, int ok)
	count a failed check
static void	feed (N_GUI_CTX *gui, int type, int x, int y, int button)
	feed one mouse event at display coordinates
static ALLEGRO_COLOR	grey (float u, float v, void *user_data)
	a caller's colour: grey everywhere
int	main (int argc, char **argv)
	run the checks
static int	near (float a, float b)
	is a near b
static void	on_change (int widget_id, int dragging, void *user_data)
	change callback
static int	process_args (int argc, char **argv)
	read -V

Variables
static int	changes = 0
	changes seen, and those while dragging
static int	colour_asked = 0
	set when the caller's colour was asked for
static int	drag_changes = 0
static int	failures = 0
	failed checks
static int	log_level = 3
	log level from -V

Macro Definition Documentation

ALLEGRO_UNSTABLE

#define ALLEGRO_UNSTABLE   1

Definition at line 29 of file ex_gui_colorwheel.c.

AT_X

#define AT_X

(

u

)

Value:

((int)(150.0f + (u) * 98.0f + 0.5f))

the wheel sits at 50,50 and is 200 by 200, its disc of radius 98 centred at 150,150: display position of a wheel coordinate

Examples

ex_gui_colorwheel.c, and ex_gui_curve.c.

Definition at line 125 of file ex_gui_colorwheel.c.

Referenced by drag(), drag(), main(), and right().

AT_Y

#define AT_Y

(

v

)

Value:

((int)(150.0f - (v) * 98.0f + 0.5f))

as AT_X, for v, which goes up

Examples

ex_gui_colorwheel.c, and ex_gui_curve.c.

Definition at line 127 of file ex_gui_colorwheel.c.

Referenced by drag(), drag(), main(), and right().

Function Documentation

drag()

void drag ( N_GUI_CTX * gui, float fu, float fv, float tu, float tv )

static

press at one point, drag to another, release

Parameters

gui	the GUI
fu	from, across
fv	from, up
tu	to, across
tv	to, up

Examples

ex_gui_colorwheel.c, and ex_gui_curve.c.

Definition at line 135 of file ex_gui_colorwheel.c.

References AT_X, AT_Y, feed(), and gui.

Referenced by main().

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expect_true()

void expect_true ( const char * what, int ok )

static

count a failed check

Parameters

what	the check
ok	its result

Definition at line 55 of file ex_gui_colorwheel.c.

References failures, LOG_ERR, LOG_INFO, and n_log.

feed()

void feed ( N_GUI_CTX * gui, int type, int x, int y, int button )

static

feed one mouse event at display coordinates

Parameters

gui	the GUI
type	the Allegro event type
x	display x
y	display y
button	the button

Examples

ex_gui_colorwheel.c, ex_gui_curve.c, ex_gui_custom_mouse.c, ex_gui_grid.c, and ex_gui_popup.c.

Definition at line 111 of file ex_gui_colorwheel.c.

References gui, n_gui_process_event(), and type().

Referenced by drag(), drag(), main(), and right().

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grey()

ALLEGRO_COLOR grey ( float u, float v, void * user_data )

static

a caller's colour: grey everywhere

Parameters

u	across
v	up
user_data	unused

Returns

grey

Examples

ex_gui_colorwheel.c.

Definition at line 97 of file ex_gui_colorwheel.c.

References colour_asked.

Referenced by main(), and n_gui_draw_color_swatch().

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main()

int main	(	int	argc,
		char **	argv )

run the checks

Parameters

argc	argument count
argv	arguments

Returns

0 on success

Definition at line 154 of file ex_gui_colorwheel.c.

References AT_X, AT_Y, changes, colour_asked, drag(), drag_changes, expect_true(), failures, feed(), font, grey(), gui, LOG_ERR, log_level, n_gui_add_label(), n_gui_add_window(), N_GUI_ALIGN_LEFT, n_gui_colorwheel_get(), n_gui_colorwheel_hue(), n_gui_colorwheel_new(), n_gui_colorwheel_set(), n_gui_colorwheel_set_colour(), n_gui_destroy_ctx(), n_gui_draw(), n_gui_new_ctx(), n_gui_open_window(), n_gui_set_display_size(), n_gui_set_double_click_time(), N_GUI_WIN_FRAMELESS, n_gui_window_set_flags(), n_log, near(), on_change(), process_args(), set_log_level(), and wheel().

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near()

int near ( float a, float b )

static

is a near b

Parameters

a	one
b	the other

Returns

non-zero when within about a pixel

Examples

ex_gui_colorwheel.c, and ex_gui_curve.c.

Definition at line 146 of file ex_gui_colorwheel.c.

Referenced by main().

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on_change()

void on_change ( int widget_id, int dragging, void * user_data )

static

change callback

Parameters

widget_id	the wheel
dragging	set while the button is held
user_data	unused

Definition at line 85 of file ex_gui_colorwheel.c.

References changes, and drag_changes.

process_args()

int process_args ( int argc, char ** argv )

static

read -V

Parameters

argc	argument count
argv	arguments

Returns

0, or -1 on a bad argument

Definition at line 68 of file ex_gui_colorwheel.c.

References log_level.

Variable Documentation

changes

int changes = 0

static

changes seen, and those while dragging

Definition at line 48 of file ex_gui_colorwheel.c.

colour_asked

int colour_asked = 0

static

set when the caller's colour was asked for

Examples

ex_gui_colorwheel.c.

Definition at line 50 of file ex_gui_colorwheel.c.

Referenced by grey(), and main().

drag_changes

int drag_changes = 0

static

Examples

ex_gui_colorwheel.c, and ex_gui_curve.c.

Definition at line 48 of file ex_gui_colorwheel.c.

Referenced by main(), on_change(), and on_change().

failures

int failures = 0

static

failed checks

Definition at line 46 of file ex_gui_colorwheel.c.

log_level

int log_level = 3

static

log level from -V

Definition at line 44 of file ex_gui_colorwheel.c.