LockAspectRatio Property

Microsoft PowerPoint Visual Basic

Determines whether the specified shape retains its original proportions when you resize it. Read/write MsoTriState.

MsoTriState can be one of these MsoTriState constants.
msoCTrue
msoFalse You can change the height and width of the shape independently of one another when you resize it.
msoTriStateMixed
msoTriStateToggle
msoTrue The specified shape retains its original proportions when you resize it.

Example

This example adds a cube to myDocument. The cube can be moved and resized, but not reproportioned.

Set myDocument = ActivePresentation.Slides(1)
myDocument.Shapes.AddShape(msoShapeCube, 50, 50, 100, 200) _
    .LockAspectRatio = msoTrue