Re: fix for inverseTransform()

[Eric Blake]

Please send bug reports to the project mailing list, not to individual
developers.  Lately I have not had any time to actively work on classpath
fixes.

According to Tim Janik on 2/14/2005 7:29 PM:
> hi tom, eric.
> 
> during code review of AffineTransform.java (for a C++ project actually),
> i came across a bug in inverseTransform().
> in order for inverseTransform() to match createInverse().transform(),
> nx and ny in:
> 
>   public Point2D inverseTransform(Point2D src, Point2D dst)
>     throws NoninvertibleTransformException
>   {
>     double det = getDeterminant();
>     if (det == 0)
>       throw new NoninvertibleTransformException("couldn't invert
> transform");
>     if (dst == null)
>       dst = new Point2D.Double();
>     double x = src.getX();
>     double y = src.getY();
>     double nx = (m11 * x + -m10 * y) / det - m02;
>     double ny = (m01 * x + -m00 * y) / det - m12;
>     dst.setLocation(nx, ny);
>     return dst;
>   }
> 
> need to be calculated as:
> 
>     double nx = (m11 * x + -m01 * y) / det - m02;
>     double ny = (-m10 * x + m00 * y) / det - m12;
> 
> 
> ---
> ciaoTJ
>