IXRSplineDoubleKeyFrame (Compact 2013)

Article
04/19/2017

3/28/2014

This class represents an animation segment that animates from the float value of the previous key frame to its own target float value by using splined interpolation.

Syntax

class IXRSplineDoubleKeyFrame : public IXRDoubleKeyFrame

Inheritance Hierarchy

IXRDependencyObject

IXRDoubleKeyFrame

IXRSplineDoubleKeyFrame

Methods

Method	Description
IXRSplinePointKeyFrame::GetKeySpline	Retrieves two control points that define animation progress for this key frame.
IXRSplinePointKeyFrame::SetKeySpline	Sets two control points that define animation progress for this key frame.

Thread Safety

Members of this class are thread-safe if you previously called IXRApplication::CreateHostFromXaml and supplied it with an XRWindowCreateParams structure that has AllowsMultipleThreadAccess set to true.

Remarks

You can use this class to animate a float value along a set of key frames by putting it in an IXRDoubleKeyFrameCollection that belongs to an IXRDoubleAnimationUsingKeyFrames object. A key frame defines a segment of the IXRDoubleAnimationUsingKeyFrames object to which it belongs. Each key frame has a target float value and a key-time. The key-time specifies the time at which the target value of the key frame is reached. A key frame animates from the target value of the previous key frame to its own target value. It starts when the previous key frame ends, and it ends when its own key-time is reached.

Spline key frames like IXRSplineDoubleKeyFrame create a variable transition between values that is determined by the key-spline. You can set the key-spline by calling IXRSplinePointKeyFrame::SetKeySpline. Splined interpolation can be used to achieve more realistic timing effects such as acceleration and deceleration.

When you create a class instance, use an IXRSplineDoubleKeyFramePtr smart pointer instead of a raw interface pointer. For more information, see XRPtr<Interface>.

You can also define a spline double key-frame in Microsoft Silverlight 3 XAML. For information about the differences between XAML in XAML for Windows Embedded and Silverlight 3, see Differences Between Microsoft Silverlight 3 and XAML for Windows Embedded. For more information about how to define this element in the source XAML for your application, see the SplineDoubleKeyFrame Class on MSDN.

Note

The name of this XAML element is generated by the Blend for Visual Studio IDE and includes "Double" in order to maintain parity with the name of its equivalent XAML element in the source XAML markup. However, in XAML for Windows Embedded, this object represents a float instead of a double.

.NET Framework Equivalent

System.Windows.Media.Animation.SplineDoubleKeyFrame

Requirements

Header	XamlRuntime.h
sysgen	SYSGEN_XAML_RUNTIME