def getWiddershinsByLength(begin, end, length):
 endMinusBegin = (end - begin)
 endMinusBeginLength = abs(endMinusBegin)
 if (endMinusBeginLength <= 0.0):
  return None
 endMinusBegin *= (length / endMinusBeginLength)
 return complex((- endMinusBegin.imag), endMinusBegin.real)

def getWiddershinsByLength ( begin , end , length ) : endMinusBegin = ( end - begin ) endMinusBeginLength = abs ( endMinusBegin ) if ( endMinusBeginLength <= 0.0 ) : return None endMinusBegin *= ( length / endMinusBeginLength ) return complex ( ( - endMinusBegin . imag ) , endMinusBegin . real )
get the widdershins by length .