how to add zoom in and zoom out feature in mfc dialog?

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MFC

Hi I am new to mfc can any one tell me how to add zoom in and zoom out feature in mfc??
thanx

Posted 22-May-13 19:27pm

Cool Dude-P

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Richard MacCutchan 23-May-13 3:38am

You need to give a lot more detail about what you are trying to zoom.

Cool Dude-P 24-May-13 9:19am

i want panning and zooming image in mfc...pls give me any hint how to do it

Richard MacCutchan 24-May-13 9:32am

Take a look at the CDC::StretchBlt and CDC::BitBlt functions.

Santhosh G_ 23-May-13 11:41am

Do you want to zoom controls in the dialog? Or do you need to zoom some bitmaps or image ?

Cool Dude-P 24-May-13 9:19am

i want panning and zooming image in mfc...pls give me any hint how to do it

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Santhosh G_ · Accepted Answer · 2013-05-24T04:57:00

Please use StretchBlt function to create zoomed effect.

BOOL StretchBlt(
  HDC hdcDest,      // handle to destination DC
  int nXOriginDest, // x-coord of destination upper-left corner
  int nYOriginDest, // y-coord of destination upper-left corner
  int nWidthDest,   // width of destination rectangle
  int nHeightDest,  // height of destination rectangle
  HDC hdcSrc,       // handle to source DC
  int nXOriginSrc,  // x-coord of source upper-left corner
  int nYOriginSrc,  // y-coord of source upper-left corner
  int nWidthSrc,    // width of source rectangle
  int nHeightSrc,   // height of source rectangle
  DWORD dwRop       // raster operation code
);

Change nXOriginSrc, nYOriginSrc, nWidthSrc, nHeightSrc to according to zoom and Pan.
Changing nXOriginSrc, nYOriginSrc will provide pan effect. Changing nWidthSrc, nHeightSrc will provide Zoom/Unzoom effect.

The following article might help you to create a zoom/pan effect of your bitmap.

CZoomCtrl: A Picture Control with Zooming and Scrolling[^]