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evas-images.c
#ifdef HAVE_CONFIG_H
#include "config.h"
#else
#define PACKAGE_EXAMPLES_DIR "."
#endif
#include <Ecore.h>
#include <Ecore_Evas.h>
#include <stdio.h>
#include <errno.h>
#define WIDTH (320)
#define HEIGHT (240)
static const char *border_img_path = PACKAGE_EXAMPLES_DIR "/red.png";
static const char *valid_path = PACKAGE_EXAMPLES_DIR "/enlightenment.png";
static const char *bogus_path = "/tmp/non-existent-220986.png";
static const char *commands = \
"commands are:\n"
"\tx - change image's x fill coordinate\n"
"\ty - change image's y fill coordinate\n"
"\tw - change image's w fill size\n"
"\te - change image's h fill size\n"
"\tf - toggle image filled property (overrides fill)\n"
"\ta - toggle image's alpha channel usage\n"
"\tm - toggle border's smooth scaling\n"
"\tt - change border's thickness\n"
"\tb - change border's center region aspect\n"
"\tc - change border's scaling factor\n"
"\ts - print image's fill property status\n"
"\th - print help\n";
struct test_data
{
Ecore_Evas *ee;
Evas *evas;
Evas_Object *img1, *img2, *bg, *border;
};
static struct test_data d = {0};
static void
_on_destroy(Ecore_Evas *ee EINA_UNUSED)
{
ecore_main_loop_quit();
}
/* here just to keep our example's window size and background image's
* size in synchrony */
static void
_canvas_resize_cb(Ecore_Evas *ee)
{
int w, h;
ecore_evas_geometry_get(ee, NULL, NULL, &w, &h);
evas_object_resize(d.bg, w, h);
}
static const char *
_border_fill_mode_to_str(Evas_Border_Fill_Mode mode)
{
switch (mode)
{
case EVAS_BORDER_FILL_NONE:
return "none";
case EVAS_BORDER_FILL_DEFAULT:
return "default";
case EVAS_BORDER_FILL_SOLID:
return "solid";
default:
return "invalid";
}
}
static void
_on_keydown(void *data EINA_UNUSED,
Evas *evas EINA_UNUSED,
Evas_Object *o EINA_UNUSED,
void *einfo)
{
Evas_Event_Key_Down *ev = einfo;
if (strcmp(ev->key, "h") == 0) /* print help */
{
fprintf(stdout, commands);
return;
}
if (strcmp(ev->key, "m") == 0) /* toggle border image's smooth scaling */
{
Eina_Bool smooth_scale = evas_object_image_smooth_scale_get(d.border);
evas_object_image_smooth_scale_set(d.border, !smooth_scale);
fprintf(stdout, "Image's border is now %s smooth scaling\n",
smooth_scale ? "without" : "with");
return;
}
if (strcmp(ev->key, "t") == 0) /* change border's thickness */
{
int l, r, t, b;
evas_object_image_border_get(d.border, &l, &r, &t, &b);
l = (l + 3) % 9;
r = (r + 3) % 9;
t = (t + 3) % 9;
b = (b + 3) % 9;
evas_object_image_border_set(d.border, l, r, t, b);
fprintf(stdout, "Image's border thickness is now %d\n", l);
return;
}
if (strcmp(ev->key, "c") == 0) /* change border's scaling factor */
{
double scale = evas_object_image_border_scale_get(d.border);
scale *= 2;
if (scale > 4.0) scale = 1.0;
evas_object_image_border_scale_set(d.border, scale);
fprintf(stdout, "Image's border scaling factor is now %f\n", scale);
return;
}
if (strcmp(ev->key, "b") == 0) /* change border's center
* region's aspect */
{
Eina_Bool fill = \
evas_object_image_border_center_fill_get(d.border);
fill = (fill + 1) % 3;
evas_object_image_border_center_fill_set(d.border, fill);
fprintf(stdout, "Image's border center region aspect is now \"%s\"\n",
_border_fill_mode_to_str(fill));
return;
}
if (strcmp(ev->key, "a") == 0) /* toggle alpha channel usage */
{
Eina_Bool alpha = evas_object_image_alpha_get(d.img1);
evas_object_image_alpha_set(d.img1, !alpha);
fprintf(stdout, "Image's alpha channel is now %s\n",
alpha ? "off" : "on");
return;
}
if (strcmp(ev->key, "f") == 0) /* toggle filled property */
{
Eina_Bool filled = evas_object_image_filled_get(d.img1);
evas_object_image_filled_set(d.img1, !filled);
fprintf(stdout, "Image's x filled property is now %s\n",
filled ? "off" : "on");
return;
}
if (strcmp(ev->key, "x") == 0) /* change x fill coordinate */
{
Evas_Coord x, y, w, h;
evas_object_image_fill_get(d.img1, &x, &y, &w, &h);
x = (x + 20) % (WIDTH / 2);
evas_object_image_fill_set(d.img1, x, y, w, h);
fprintf(stdout, "Image's x fill coordinate changed to %d\n", x);
return;
}
if (strcmp(ev->key, "y") == 0) /* change y fill coordinate */
{
Evas_Coord x, y, w, h;
evas_object_image_fill_get(d.img1, &x, &y, &w, &h);
y = (y + 20) % (HEIGHT / 2);
evas_object_image_fill_set(d.img1, x, y, w, h);
fprintf(stdout, "Image's y fill coordinate changed to %d\n", y);
return;
}
if (strcmp(ev->key, "w") == 0) /* change w fill size */
{
Evas_Coord x, y, w, h;
evas_object_image_fill_get(d.img1, &x, &y, &w, &h);
if (w == (WIDTH / 4)) w = (WIDTH / 2);
else if (w == WIDTH / 2) w = WIDTH;
else w = (WIDTH / 4);
evas_object_image_fill_set(d.img1, x, y, w, h);
fprintf(stdout, "Image's w fill size changed to %d\n", w);
return;
}
if (strcmp(ev->key, "e") == 0) /* change h fill size */
{
Evas_Coord x, y, w, h;
evas_object_image_fill_get(d.img1, &x, &y, &w, &h);
if (h == (HEIGHT / 4)) h = (HEIGHT / 2);
else if (h == HEIGHT / 2) h = HEIGHT;
else h = (HEIGHT / 4);
evas_object_image_fill_set(d.img1, x, y, w, h);
fprintf(stdout, "Image's h fill size changed to %d\n", h);
return;
}
if (strcmp(ev->key, "s") == 0) /* status */
{
Evas_Coord x, y, w, h;
evas_object_image_fill_get(d.img1, &x, &y, &w, &h);
fprintf(stdout, "Image has fill properties set to: %d, %d, %d, %d\n",
x, y, w, h);
return;
}
}
int
main(void)
{
int err;
if (!ecore_evas_init())
return EXIT_FAILURE;
/* this will give you a window with an Evas canvas under the first
* engine available */
d.ee = ecore_evas_new(NULL, 10, 10, WIDTH, HEIGHT, NULL);
if (!d.ee)
goto error;
ecore_evas_callback_destroy_set(d.ee, _on_destroy);
ecore_evas_callback_resize_set(d.ee, _canvas_resize_cb);
ecore_evas_show(d.ee);
/* the canvas pointer, de facto */
d.evas = ecore_evas_get(d.ee);
d.bg = evas_object_rectangle_add(d.evas);
evas_object_color_set(d.bg, 255, 255, 255, 255); /* white bg */
evas_object_move(d.bg, 0, 0); /* at canvas' origin */
evas_object_resize(d.bg, WIDTH, HEIGHT); /* covers full canvas */
evas_object_show(d.bg);
d.img1 = evas_object_image_add(d.evas);
evas_object_image_file_set(d.img1, valid_path, NULL);
err = evas_object_image_load_error_get(d.img1);
if (err != EVAS_LOAD_ERROR_NONE)
{
fprintf(stderr, "could not load image '%s'. error string is \"%s\"\n",
valid_path, evas_load_error_str(err));
}
else
{
fprintf(stdout,
"loaded image '%s' with succes! error string is \"%s\"\n",
valid_path, evas_load_error_str(err));
evas_object_move(d.img1, 3, 3);
evas_object_image_fill_set(d.img1, 0, 0, WIDTH / 2, HEIGHT / 2);
evas_object_resize(d.img1, WIDTH / 2, HEIGHT / 2);
evas_object_show(d.img1);
evas_object_focus_set(d.bg, EINA_TRUE);
evas_object_event_callback_add(
d.bg, EVAS_CALLBACK_KEY_DOWN, _on_keydown, NULL);
}
/* this is a border around the image above, here just to emphasize
* its geometry */
d.border = evas_object_image_filled_add(d.evas);
evas_object_image_file_set(d.border, border_img_path, NULL);
evas_object_image_border_set(d.border, 3, 3, 3, 3);
evas_object_image_border_center_fill_set(d.border, EVAS_BORDER_FILL_NONE);
evas_object_move(d.border, 0, 0);
evas_object_resize(d.border, (WIDTH / 2) + 6, (HEIGHT / 2) + 6);
evas_object_show(d.border);
/* image loading will fail for this one -- unless one cheats and
* puts a valid image on that path */
d.img2 = evas_object_image_add(d.evas);
evas_object_image_file_set(d.img2, bogus_path, NULL);
err = evas_object_image_load_error_get(d.img2);
if (err != EVAS_LOAD_ERROR_NONE)
{
fprintf(stderr, "could not load image '%s': error string is \"%s\"\n",
bogus_path, evas_load_error_str(err));
}
else
{
evas_object_move(d.img2, WIDTH / 2, HEIGHT / 2);
evas_object_image_fill_set(d.img2, 0, 0, WIDTH / 2, HEIGHT / 2);
evas_object_resize(d.img2, WIDTH / 2, HEIGHT / 2);
evas_object_show(d.img2);
}
fprintf(stdout, commands);
ecore_main_loop_begin();
ecore_evas_free(d.ee);
ecore_evas_shutdown();
return 0;
error:
fprintf(stderr, "you got to have at least one evas engine built and linked"
" up to ecore-evas for this example to run properly.\n");
ecore_evas_shutdown();
return -1;
}