Perspective tentative with EFL

rotate.c

#define EFL_EO_API_SUPPORT
#define EFL_BETA_API_SUPPORT

#include <Eolian.h>
#include <Elementary.h>

double previous = 0;
static void
on_slide(void *data, Eo *obj, void *event_info)
{
    double val = elm_slider_value_get(obj);
    EINA_LOG_ERR("Slider callback to %f", val);

    double delta = val - previous;
    previous = val;

    Eo *img = (Eo*) data;

    int w, h;
    EINA_SIZE2D(w, h) = efl_gfx_size_get(img);

    efl_gfx_map_rotate_3d(img, 0, 360*delta, 0, img, 0.5, 0.5, 0);
}

EAPI_MAIN int
elm_main(int argc, char *argv[])
{
    Evas_Object *win;

    win = elm_win_util_standard_add("Perspective", "Perspective");
    elm_policy_set(ELM_POLICY_QUIT, ELM_POLICY_QUIT_LAST_WINDOW_CLOSED);

    Eo *box = efl_add(EFL_UI_BOX_CLASS, win);

    Eo *slider = efl_add(EFL_UI_SLIDER_CLASS, box);
    efl_pack_end(box, slider);

    Eo *image = efl_add(EFL_UI_IMAGE_CLASS, box);
    elm_image_file_set(image, "./image.jpg", NULL);
    evas_object_resize(image, 250, 250);
    efl_pack_end(box, image);

    double px = 0;
    double py = 0.5;
    double z0 = 0;
    double foc = 1024;
    efl_gfx_map_perspective_3d(image, NULL, px, py, z0, foc);

    evas_object_smart_callback_add(slider, "changed", on_slide, image);

    elm_win_resize_object_add(win, box);
    efl_gfx_size_set(win, EINA_SIZE2D(250, 400));

    evas_object_show(image);
    evas_object_show(slider);
    evas_object_show(box);
    evas_object_show(win);

    elm_run();
}
ELM_MAIN()