"phil cunningham" <phil@oakleafsoftwareNOSPAM.co.uk> wrote in message
news:%23udy9UMfEHA.3200@TK2MSFTNGP09.phx.gbl...

"Jay B. Harlow [MVP - Outlook]" <Jay_Harlow_MVP@msn.com> wrote in message
news:%23WQABkvfEHA.596@TK2MSFTNGP11.phx.gbl...
> Phil,
> Charles Petzold's book "Program Microsoft windows with Microsoft Visual
> Basic .NET" from MS Press, also available in a C# version. Has a number of
> example on converting mouse coordinates to world coordinates.
>
> I normally have a function that will initialize the Transform for me
> consistently for both the Paint & the Mouse events.
>
> Once I have a consistent Transform I use Graphics.TransformPoints to
convert
> to & from Page or World & Device coordinates.
>
> The mouse is actually in Device coordinates.
>
> I don't have a sample readily available right now, post if you would like
> one.
>
> Hope this helps
> Jay
>
>
> "phil cunningham" <phil@oakleafsoftwareNOSPAM.co.uk> wrote in message
> news:%23udy9UMfEHA.3200@TK2MSFTNGP09.phx.gbl...
> I am new to C# and GDI+ so I may have missed a simple way of doing this.
>
> I am trying to use the mouse to pick object up by seeing if the mouse
> position is Inside the object.
>
> However, I am using the Transform method as follows
>
> float scale=2;
> Matrix x = new Matrix();
> x.Scale(shift,shift);
> g.Transform=x;
> pl.Draw(g);
>
>
> The objects appear twice the size on screen but the mouse position is in
the
> Page system.
> How can I transform the mouse position into World coordinates so that I
can
> check it against the real objects
>
>
> Thanks in advance for any help you can offer
> Phil
>
>