rla20@duts.ccc.amdahl.com (Roger Allen) (03/07/91)
This should be an easy one for some net-guru out there... Here is what I am doing: I am displaying a color picture in a window and also keep a copy of the picture in an offscreen PixMap. Everything about this situation seems hunky-dory, updates via copybits works great, scrolling works, etc. I am implementing Copy/Paste and having problems with DrawPicture (I think). If the user selects a rectangle to copy, I do the following: 1. Set the port to the offscreen PixMap. 2. Set the clip rect to the selection rectangle. 3. Open a Picture. 4. CopyBits the selection rect from the PixMap to the PixMap. 5. Close the Picture & put it in the scrap. The above works fine. Please read on. Here is my problem: If I paste the picture to the window (via SetPort & DrawPicture) the colors are good. BUT, if I paste to the offscreen PixMap (via SetPort & DrawPicture), the next update to the window (a CopyBits from PixMap to window) shows that the pasted rects colors are all messed. So, my question is: why would DrawPicture work for the window but not the offscreen PixMap, when the picture was made from the PixMap? Any help at all would be great, please E-mail me and I will summarize the responses. Thanks in advance, Roger -- > Roger Allen | :~) "I always lie" < > Amdahl Computer Development | < > rla20@duts.ccc.amdahl.com | ;~( "I'm lying now" <
smoke@well.sf.ca.us (Nicholas Jackiw) (03/11/91)
This may not be the problem, but if your port's forecolor & backcolor
aren't black and white at the time of the CopyBits (as they may not be
if your picture-drawing routine's changed them), CopyBits will "colorize"
your picture for you. The taste that it shows when colorizing is one
understood best by its author... Try throwing in a ForeColor(blackColor)
and BackColor(whiteColor) immediately before your copyBits, and see if
that changes anything.
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Nicholas Jackiw Smoke@well.sf.ca.us | Jackiw@cs.swarthmore.edu
Key Curriculum Press, Inc. Applelink: D3970 | (415) 548-2304
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