Author: Bo Persson
Date: 09:27:51 11/18/01
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On November 17, 2001 at 17:31:49, Eran wrote: > >I program a chess window interface in MFC. After I successfully created >draggable chess pieces from bitmap resources, I had problems with the >transparency surrounding the chess pieces. When I called the function as show >below, > >::TransparentBlt((HDC) &dc, org.x, org.y, size.x, size.x, (HDC) &dcMem, > org.x, org.x, size.x, size.y, RGB(255, 255, 255)); > >the transparency looked fine if I never dragged them from their origin squares. >When I dragged a piece, the transparent region (a rectangle shape contains a >piece in center) surrounding it cut off from the area of the board and the >region followed the piece around like a shadow. That was a problem. Since I >could not find a solution in MFC, I dived into a more complicated Win32 >programming codes in the WinBoard 4.2.3 source files. I could not find it there >either. I tried with icons instead of bitmap resources but failed to show up on >client area of the View class. MFC is pretty inflexible. > >If you know how to do it or if you have correct MFC codes (I prefer clear codes >with good explanations), please let me know. > >I would appreciate your help a great deal. > >My developing program is MS Visual C++ 6.0 Professional with latest update. If you are using an MCF View to display your board, there is also a CImageList class that implements Drag'n'Drop for images! After loading the image list with pieces and masks, all you have to do is in OnLButtonDown() ImageList.BeginDrag(Index); ImageList.DragEnter(this,coordinate); in OnMouseMove() ImageList.DragMove(new_coordinate) in OnLButtonUp() ImageList.EndDrag(); ImageList.DragLeave(this); Just remember the square from OnLButtonUp() and you are there! Bo Persson bop2@telia.com >Thank you, >Eran >My new email address: eran_k1@bezeqint.net >Please do not email any message to my old email address (mrerk@barak-online.net)
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