SmoothStart Property

SmoothStart Property
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MsoTriState

MsoTriState can be one of these MsoTriState constants.
msoCTrue Doesn't apply to this property.
msoFalse Default. The animation does not accelerate when it starts. 
msoTriStateMixed Doesn't apply to this property.
msoTriStateToggle Doesn't apply to this property.
msoTrue The animation accelerates when it starts. 

expression.SmoothStart

expression   Required. An expression that returns one of the objects in the Applies To list.

Example

The following example adds a shape to a slide, animates the shape, and instructs the shape to accelerate when it starts.

  Sub AddShapeSetTiming()

    Dim effDiamond As Effect
    Dim shpRectangle As Shape

    Set shpRectangle = ActivePresentation.Slides(1).Shapes _
        .AddShape(Type:=msoShapeRectangle, Left:=100, _
        Top:=100, Width:=50, Height:=50)
    Set effDiamond = ActivePresentation.Slides(1).TimeLine.MainSequence _
        .AddEffect(Shape:=shpRectangle, effectId:=msoAnimEffectPathDiamond)

    With effDiamond.Timing
        .Duration = 5
        .SmoothStart = msoTrue
    End With

End Sub