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   <TITLE>Tools - Understanding GDI mapping modes and other functions</TITLE>
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<FONT COLOR="#AOAO99">Understanding GDI mapping modes and other functions</FONT></H3></CENTER>

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<P>This tool was contributed by <A HREF="mailto:hansw@flash.net">Hans Wedemeyer</A>. 


<P>MapMode.exe is an interactive tool that can help a programmer better understand
various graphics functions and their interactions.

<P>It demonstrates the interactions of

<pre>
SetMapMode()    // all eight modes
SetWindowExt ()
SetViewportExt ()
SetViewportOrg ()
CreateCompatibleBitmap()
BitBlt( )
</pre>

<P>Have you ever wondered what a printed page will look like in a particular map
mode, here's thre answer and you don't have to write code to find out !

<P>Ever wondered what all those arguments to BitBlt() do ! now you can find out!

<P>Open eight windows and compare all eight map modes at the same time !

<P>When you run the program, there appears a "control panel", on it are various
buttons to adjust the parameters for each function. as you adjust the screen
is repainted and the change takes place immediately.

<P>Consider these to be in the program's OnDraw()

<PRE><TT><FONT COLOR="#990000">
void MapMode::OnDraw(CDC* pDC )
{
    CRect rect;
    GetClientRect(&rect);

    if ( pDC->IsPrinting())
    {
        rect.left = 0;
        rect.top = 0;
        rect.right = pDC->GetDeviceCaps(HORZRES);
        rect.bottom = pDC->GetDeviceCaps(VERTRES);
    }

    pDC->SetMapMode ( m_nMapMode );

    pDC->SetWindowExt ( X, Y )

    pDC->SetViewportExt ( X , Y );

    pDC->SetViewportOrg ( X, Y );

    bmp.CreateCompatibleBitmap( pDC, X, Y );

   pDC->BitBlt( X1, Y1, X2, Y2, pBmpDC, X3, Y3, SRCCOPY );
}
</FONT></TT></PRE>

<P>You may draw a line to better understand or locate various x,y coordinates.

<H4>Additions made since the original tool.</H4>

<P>Annotated origins for easy indentifaction.

<P>Another new feature is "Find Origin" which help pin point in which direction the
origin could be, useful if you loose the origin off screen.



<P><A HREF="map_mode.zip" tppabs="http://www.codeguru.com/tools/map_mode.zip">Download file</A>



<P>Posted on: 3/15/98
<P>Code updated on: 4/11/98 ( Four of the spin buttons did not spin, they do now ).

<P>
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