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Clear piece on the cross

Posted on 2007-03-19
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Last Modified: 2010-04-05
I'm making a Chinese chess program,  called XiangQi. the pieces are put on the crosses, not in square, this is different from internatinal chess... when dragging a piece to another cross, how to clear the old piece?

type cross used to define each crosses on the board:
type

 Cross=(None,A9,B9,C9,D9,E9,F9,G9,H9,I9,
                  A8,B8,C8,D8,E8,F8,G8,H8,I8,
                  A7,B7,C7,D7,E7,F7,G7,H7,I7,
                  A6,B6,C6,D6,E6,F6,G6,H6,I6,
                  A5,B5,C5,D5,E5,F5,G5,H5,I5,
                  A4,B4,C4,D4,E4,F4,G4,H4,I4,
                  A3,B3,C3,D3,E3,F3,G3,H3,I3,
                  A2,B2,C2,D2,E2,F2,G2,H2,I2,
                  A1,B1,C1,D1,E1,F1,G1,H1,I1,
                  A0,B0,C0,D0,E0,F0,G0,H0,I0);

....

I want to make a procedure like:
procedure ClearCross(cr: Cross);

to clear the old piece on the old cross, we can re-draw the background, but the problem is that not all the background are the same, see demo here: http://www.xerp.cn/cc/project1.exe
in this demo, when I drag a piece away, the background will be cleared, we need to draw something to make it look like the original look, see the blank board here: http://www.xerp.cn/cc/xqboard.bmp

Any ideas? tks
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Question by:adm_adamlee
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TheRealLoki earned 500 total points
ID: 18746846
1 way would be to copy what is under the cross before you put the piece on it, then when you move the piece off, just repaint what you saved.
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by:adm_adamlee
ID: 18753297
Looks a good idea, I will try that first.
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by:adm_adamlee
ID: 18753538
before dragging a piece away, we can not copy the background under the piece, because it is overwritten, what you will copy is the piece itself.
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Expert Comment

by:TheRealLoki
ID: 18754274
What I am suggesting is you take a copy before any pieces are placed on teh board, that way, you have the true background of it kept.
another way would be to keep a copy of the entire board (but empty) in another bitmap, then just copy from that.
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