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<HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Author" CONTENT="Zafir Anjum"> <TITLE>Tools - Understanding GDI mapping modes and other functions</TITLE></HEAD><body background="../fancyhome/back.gif" bgcolor="#FFFFFF" link="#B50029" vlink="#8E2323" alink="#FF0000" bgproperties="fixed"><table WIDTH="100%"><tr WIDTH="100%"><td align=center><!--#exec cgi="/cgi/ads.cgi"--><td></tr></table><CENTER><H3><FONT COLOR="#AOAO99">Understanding GDI mapping modes and other functions</FONT></H3></CENTER><HR><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 understandvarious graphics functions and their interactions.<P>It demonstrates the interactions of<pre>SetMapMode() // all eight modesSetWindowExt ()SetViewportExt ()SetViewportOrg ()CreateCompatibleBitmap()BitBlt( )</pre><P>Have you ever wondered what a printed page will look like in a particular mapmode, 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 variousbuttons to adjust the parameters for each function. as you adjust the screenis 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 theorigin could be, useful if you loose the origin off screen.<P><A HREF="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><HR><TABLE BORDER=0 WIDTH="100%" ><TR><TD WIDTH="33%"><FONT SIZE=-1><A HREF="http://www.codeguru.com">Goto HomePage</A></FONT></TD><TD WIDTH="33%"><CENTER><FONT SIZE=-2>© 1998 Zafir Anjum</FONT> </CENTER></TD><TD WIDTH="34%"><DIV ALIGN=right><FONT SIZE=-1>Contact me: <A HREF="mailto:zafir@home.com">zafir@home.com</A> </FONT></DIV></TD></TR></TABLE></BODY></HTML>?? 快捷鍵說明
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