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#1 Posted : Thursday, December 15, 2011 8:02:50 AM(UTC)
tbecker82

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Posts: 37


I am having an issue where I am changing the DPI of my image but the measurements from the ruler are not updating.
I am using Leadtools 17.5 with C++ class libraries in MFC.

The following is the code I am using to change the DPI for my image.  I am using this to calibrate the ruler.
m_LAnnoWnd is a class that inherits from LAnnotationWindow.


       m_LAnnoWnd.GetAutomationObject().SetBitmapDpiX(dpi);
       m_LAnnoWnd.GetAutomationObject().SetBitmapDpiY(dpi);
       m_LAnnoWnd.GetAutomationObject().SetDpiX(dpi);
       m_LAnnoWnd.GetAutomationObject().SetDpiY(dpi);
      m_LAnnoWnd.SetXResolution(dpi);
       m_LAnnoWnd.SetYResolution(dpi);

I call invalidate on my Cwnd after these functions are used.
Is there something else I need to change or another function I should use?

Thanks
 

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#2 Posted : Friday, December 16, 2011 2:28:49 PM(UTC)

Danny H  
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The rule is not actually designed to have this behavior in C++ Class Libraries. However, you can easily update the measurement using CalibrateRuler.

http://www.leadtools.com/help/leadtools/v175/main/clib/lannotat/lannotation__calibrateruler.htm

The above documentation has an example of what you will need to do. Of course you will need to calculate the new size yourself.

Thanks,
 
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