lv_obj_get_transformed_area() function
Transform an area using the angle and zoom style properties of an object
Syntax
void lv_obj_get_transformed_area(const struct _lv_obj_t * obj,
lv_area_t * area,
bool recursive,
bool inv);
Arguments
obj
pointer to an object whose style properties should be used
area
an area to transform, the result will be written back here too
recursive
consider the transformation properties of the parents too
inv
do the inverse of the transformation (-angle and 1/zoom)