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How do I resize images using vba code (powerpoint 2010) so they are center scaled?

Posted on 2015-01-18
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Last Modified: 2015-01-28
I've written vba code to reduce the width of all images in a deck by 25%. But they default to reducing these images by the right side. How can I incorporate into my code that the images scale back 25% from their center and not the right side. I know there is a vba term ScaleFromMiddle but don't know how to incorporate it into my code.
Thank you.

Sub Scale()
Dim Sl As Slide
Dim Sh As Shape
For Each Sl In ActivePresentation.Slides
    For Each Sh In Sl.Shapes
        Sh.LockAspectRatio = False
    Next
Next
Dim oshp As Shape
Dim osld As Slide
Dim dblscaleamount As Double

dblscaleamount = 0.75
For Each osld In ActivePresentation.Slides
For Each oshp In osld.Shapes
If oshp.Type = msoPicture Or _
   oshp.Type = msoChart Or _
   oshp.Type = msoTable Or _
   oshp.Type = msoAutoShape Or _
   oshp.Type = msoGroup Then
oshp.width = oshp.width * dblscaleamount
oshp.Height = oshp.Height
End If
Next oshp
Next osld
End Sub
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Question by:Cadberry
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7 Comments
 
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Expert Comment

by:aikimark
ID: 40556959
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Assisted Solution

by:Rgonzo1971
Rgonzo1971 earned 167 total points
ID: 40557082
Hi,

pls try

oshp.ScaleWidth dblscaleamount, msoFalse, msoScaleFromMiddle

Regards
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LVL 23

Assisted Solution

by:JSRWilson
JSRWilson earned 167 total points
ID: 40557121
Just a slight addition to Rgonzo's good code

With oshp
    .LockAspectRatio = msoTrue
    .ScaleWidth dblscaleamount, msoFalse, msoScaleFromMiddle
End With

For images LockAspectRation True is the default but not for shapes where the default is False

Pedantic point Factor is a Single not a Double
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LVL 11

Accepted Solution

by:
Jamie Garroch earned 166 total points
ID: 40557241
In addition, I get a compile error with the procedure name so putting it all together:

Option Explicit

' Scale all shapes from their centres in all slides in the current presenation
Sub ScaleShapes()
  Dim oSld As Slide
  Dim oShp As Shape
  Dim sScale As Single
  
  sScale = 0.75
  
  For Each oSld In ActivePresentation.Slides
    For Each oShp In oSld.Shapes
      With oShp
        If .Type = msoPicture Or _
           .Type = msoChart Or _
           .Type = msoTable Or _
           .Type = msoAutoShape Or _
           .Type = msoGroup Then
              .LockAspectRatio = msoTrue
              .ScaleWidth sScale, msoFalse, msoScaleFromMiddle
        End If
      End With
    Next
  Next
End Sub

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Expert Comment

by:JSRWilson
ID: 40557481
Yep Scale is a vba reserved word like Print, Byte, Dim etc.

I have tries several times to get a full list but it doesn't seem to exist.
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LVL 11

Expert Comment

by:Jamie Garroch
ID: 40557488
Glad it's not just me JSRWilson!
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Author Closing Comment

by:Cadberry
ID: 40576671
Thank you all! These are fantastic solutions.
I was being stubborn and trying to figure out how to have IncrementLeft = 12.5% of the image width as an alternative to ScaleFromMiddle but finally had to cede that it wasn't working.  Thank you all again and apologize for the delayed response.
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