Velocity Property (PinchArgs)
The speed at which to perform the pinch operation.
This number specifies the scale factor per second, meaning the ratio between the touch point distance at one second, and the touch point distance one second later. For example, if performing a pinch from 6 cm to 3 cm (0.5 scale) takes 2 seconds, then the velocity is 0.25.

C# Syntax

public Nullable<double> Velocity {get; set;}