pub unsafe extern "C" fn lv_chart_add_cursor(
obj: *mut lv_obj_t,
color: lv_color_t,
dir: u32,
) -> *mut lv_chart_cursor_t
pub unsafe extern "C" fn lv_chart_add_cursor(
obj: *mut lv_obj_t,
color: lv_color_t,
dir: u32,
) -> *mut lv_chart_cursor_t