lv_scale_set_line_needle_value() function

pointer to a scale object

needle_line of the scale. The line points will be allocated and managed by the scale unless the line point array was previously set using `lv_line_set_points_mutable`.

length of the needle needle_length>0 needle_length=needle_length; needle_length<0 needle_length=radius-|needle_length|;

needle to point to the corresponding value