Lvgl 8.2 picture scaling and rotation

The animation callback function sets the angle

static void set_angle(void* img, int32_t v)
{
    
    lv_img_set_angle(img, v);
}

The animation callback function sets the zoom size

static void set_zoom(void* img, int32_t v)
{
    
    lv_img_set_zoom(img, v);
}

establish Image And zoom , Rotate the picture

/** * Show transformations (zoom and rotation) using a pivot point. */
static void lv_example_img_3(void)
{
    
    LV_IMG_DECLARE(img_cogwheel_argb);   //  Picture resource statement 
    /*Now create the actual image*/
    lv_obj_t* img = lv_img_create(lv_scr_act()); //  establish Image object 
    lv_img_set_src(img, &img_cogwheel_argb); // Set the displayed picture source 
    lv_obj_align(img, LV_ALIGN_CENTER, 50, 50); //  Center offset 50,50 Align at 
    lv_img_set_pivot(img, 0, 0); //  around Image Rotate the upper left corner of the object 
    lv_anim_t a;
    lv_anim_init(&a);  //  Initializing animation variables 
    lv_anim_set_var(&a, img); // Animate the associated objects img
    lv_anim_set_exec_cb(&a, set_angle); // Set the callback function for animation execution set_angle
    lv_anim_set_values(&a, 0, 3600); //  Set the range of animation , Here is the angle 0~360 degree 
    lv_anim_set_time(&a, 5000); // Animate duration Time 5000 millisecond 
    lv_anim_set_repeat_count(&a, LV_ANIM_REPEAT_INFINITE);// Set the number of animation repetitions , Here is infinite times 
    lv_anim_start(&a); // Start animation playback 
    lv_anim_set_exec_cb(&a, set_zoom); // Set the animation to execute the callback function set_zoom
    lv_anim_set_values(&a, 128, 256); //  Set the range of animation , Here is the zoom ratio 128~256
    lv_anim_set_playback_time(&a, 3000); //  Set the animation replay time 3000 millisecond 
    lv_anim_start(&a);  // Start animation playback 
}

Running effect