InertiaRotationBehavior Class
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InertiaRotationBehavior Class

.NET Framework 4.6 and 4.5

Controls the deceleration of a rotation manipulation during inertia.

Namespace:   System.Windows.Input
Assembly:  PresentationCore (in PresentationCore.dll)


public class InertiaRotationBehavior


Initializes a new instance of the InertiaRotationBehavior class.


Gets or sets the rate the rotation slows in degrees per squared millisecond.


Gets or sets the rotation, in degrees, at the end of the inertial movement.


Gets or sets the initial rate of the rotation at the start of the inertia phase.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Returns a string that represents the current object.(Inherited from Object.)

The InertiaRotationBehavior class specifies how a rotation manipulation behaves when it is inertia. Use the RotationBehavior property in the ManipulationInertiaStarting event to do the following:

  • Specify the initial velocity of the inertia when it begins by setting the InitialVelocity property.

  • Specify the desired rotation of the manipulation when inertia ends by setting the DesiredRotation property.

  • Specify the desired deceleration of the inertia by setting the DesiredDeceleration property.

Set either the DesiredRotation or the DesiredDeceleration, but not both. When you set one of these properties, the other property is changed to Double.NaN if it has a value.

For more information about manipulations, see the Input Overview. For an example of an application that responds to manipulations, see Walkthrough: Creating Your First Touch Application.

The following example shows the ManipulationInertiaStarting event handler and sets the desired deceleration for translation, expansion, and rotation that is used during inertia. This example is part of a larger example in Walkthrough: Creating Your First Touch Application.

void Window_InertiaStarting(object sender, ManipulationInertiaStartingEventArgs e)

    // Decrease the velocity of the Rectangle's movement by 
    // 10 inches per second every second.
    // (10 inches * 96 pixels per inch / 1000ms^2)
    e.TranslationBehavior.DesiredDeceleration = 10.0 * 96.0 / (1000.0 * 1000.0);

    // Decrease the velocity of the Rectangle's resizing by 
    // 0.1 inches per second every second.
    // (0.1 inches * 96 pixels per inch / (1000ms^2)
    e.ExpansionBehavior.DesiredDeceleration = 0.1 * 96 / (1000.0 * 1000.0);

    // Decrease the velocity of the Rectangle's rotation rate by 
    // 2 rotations per second every second.
    // (2 * 360 degrees / (1000ms^2)
    e.RotationBehavior.DesiredDeceleration = 720 / (1000.0 * 1000.0);

    e.Handled = true;

.NET Framework
Available since 4.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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