Well then in case anyone needs such a transformation, I've constructed the (non-unique) transformation T<br><br>> t:=angle(f,e);<br>> q:=e++f;<br>> p:=(c*f-d*e)/q;<br>> s:=(c*e+d*f)/(q**2);<br>> transform T;<br>
> T:=identity rotated t xscaled p yscaled q slanted s shifted (a,b);<br><br>This yields T=(a,b,c,d,e,f).<br><br>Troy<br><br><br>