> Then, cut out the large-rect by 1 each side which make large-rect of > (-8, -8) ~ (8, 8)
Oops, this should be (-9, -9) ~ (9, 9), of course. > So, basically something like this: > > hWnd.size(2 * (nRect - nZoom/2), 2 * (nRect - nZoom/2)) > hWnd.move(xmouse - (nRect - nZoom/2), ymouse - (nRect - nZoom/2)) > > StretchBlt( > hDC_TT, 0 - nZoom/2*2, 0 - nZoom/2*2, nRect * 2, nRect * 2, > hDC_SC,xmouse-nRect/nZoom,ymouse-nRect/nZoom,nRect/nZoom*2,nRect/nZoom*2) > > However, I'm not sure if it's poosible to map to the negative > coordinates of the target DC (hDC_TT), and the formula looks awful. I did a quick test, and no, mapping to the negative coordinate seems not allowed. Then, the next best is to shift (1, 1) of stretched (-2, -2) ~ (0, 0) and read the color at (-1, -1) on screen: nZoom = 5 nRect = 100/2/nZoom*nZoom hWnd.size((nRect - nZoom/2) * 2, (nRect - nZoom/2) * 2) hWnd.move(xmouse - (nRect - nZoom/2), ymouse - (nRect - nZoom/2)) StretchBlt( hDC_TT, 0, 0, nRect * 2, nRect * 2, hDC_SC,xmouse-nRect/nZoom,ymouse-nRect/nZoom,nRect/nZoom*2,nRect/nZoom*2) GetPixel(xmouse - 1, ymouse - 1) It seems to work fine. Sean Attention: PowerPro's Web site has moved: http://www.ppro.org Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/power-pro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
