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Kevin
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 Posted: Mon Jul 21, 2003 9:30 pm Post subject: Help with Scanline and TBits |
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I am trying to use a mono bitmap to detect which points are in an ellipse.
I draw the ellipse in black on a large mono bitmap and test the bits to see
if a coordinate fel within or outside of the ellipse (within, the bit is 0).
I think the best way to do this would be to get a Scanline from the mono
bitmap, cast or convert it to TBits and then use the TBits index in my For
loop.
This isn't working:
Q := TBits(MonoBM.Scanline[Row]);
Q.Size := DrawRect.Right; // size is -1 if I don't do this, cast
seems not to have worked
for loop := 0 to to Bitmap.Right -1 do
if Q[a] then // this blows with 'Priveliged Instruction' error
...
Anyone know how to get mono bitmap bits into a TBits?
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