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#1 Posted : Thursday, January 25, 2007 1:18:12 AM(UTC)

Teresa  
Teresa

Groups: Registered
Posts: 7


Dear all,

Is it possible to misure the area of a region choosen by the user on the freehand (VB6)?

I am trying on the onAnnDrawn  event calling the getarea method, but his gives me the number of pixels that make nosense when I translate them to other misurements

Is it correct what i am trying to do, is there any other way to do it?

Private Sub RasterAnn_OnAnnDrawn(ByVal hAnnObject As Long)

   If etiqueta = ANNTOOL_FREEHAND Then MsgBox "Area:" & RasterAnn.AnnGetArea(hAnnObject)
  End Sub

Thanks so much in advance

 

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#2 Posted : Friday, January 26, 2007 2:29:57 AM(UTC)

Teresa  
Teresa

Groups: Registered
Posts: 7


Hi, its me again, I think my question is not clear, once I get the area, the number of pixels, do I have to calculate the resolution and divide it by the resolution?, can you give me an example of how to calculate the area in Cm once I have the number of pixel

Thanks so much

 
#3 Posted : Sunday, January 28, 2007 5:17:48 AM(UTC)

Qasem Lubani  
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Was thanked: 1 time(s) in 1 post(s)

You can use the following approach to calculate the area in CM:

1-Total area in pixels (Dots) = (Dot *Dot) =Dot ².
2-Resolution is measured in Dot/Inch.
3-Dot²/(XResolution *YResolution) =Inch²
4-Inch² *(2.54 CM/Inch)² =CM²

So, Area in CM² = (Area in Pixel²)/(XResolution *YResolution) * (2.54)²

 
#4 Posted : Sunday, January 28, 2007 11:24:49 PM(UTC)

Teresa  
Teresa

Groups: Registered
Posts: 7


Thank you very much for your quick response!!!, I will use your formula

Thanks again

Teresa

 
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