VectorKeyFrame


VectorKeyFrameHierarchy: DependencyObject Freezable

VectorPointFrame is the base class for three types of Vector key frames: discrete, linear, and spline. Each of the three subclasses of VectorKeyFrame represents a key frame with a distinct interpolation technique, indicated by its name:

     <LinearVectorKeyFrame             KeyTime="0:0:10|Uniform|Paced|30%"             Value="1,1" />     <DiscreteVectorKeyFrame             KeyTime="0:0:10|Uniform|Paced|30%"             Value="1,1" />     <SplineVectorKeyFrame             KeyTime="0:0:10|Uniform|Paced|30%"             Value="1,1" >             <SplineVectorKeyFrame.KeySpline>                 <KeySpline ControlPoint1="5,5" ControlPoint2="10,10" />             </SplineVectorKeyFrame.KeySpline>     </SplineVectorKeyFrame> 

All three VectorKeyFrame subclasses determine when (KeyTime) the frame will reach the designated value (Value). KeyTime is specified in terms of hours:minutes:seconds. The Value attribute of all VectorKeyFrame subclasses is a Vector.


DiscreteVectorKeyFrame

Skips from one value to the desired value without interpolation. Thus, the Value will not be reached until KeyTime (relative to the beginning of the animation).


LinearVectorKeyFrame

Utilizes linear interpolation to reach the desired value. Linear interpolation progresses the animation at a steady rate for its duration.


SplineVectorKeyFrame

Uses a concept similar to Bezier curves to interpolate values until Value has been reached. This subclass requires an additional attribute, KeySpline, which is used to interpolate the value in much the same way as control points are used to interpolate a line when declaring a Bezier curve.

The Vector value may be specified using abbreviated markup syntax or explicitly declared as a Vector element.

Attributes


KeySpline (required) (SplineVectorKeyFrame only)

This KeySpline describes how the key frame will be altered during animation.


KeyTime (required)

This attribute specifies when, relative to the animation, this key frame takes place:

  • A time period specified in hours:minutes:seconds.

  • Uniform: The Duration will be split evenly among all key frames.

  • Paced: The Duration will be split among key frames in a way that ensures the speed of the animation remains relatively constant.

  • A percentage of the total duration.


Value (required)

This Vector describes the destination value of the key frame.




XAML in a Nutshell
XAML in a Nutshell (In a Nutshell (OReilly))
ISBN: 0596526733
EAN: 2147483647
Year: 2007
Pages: 217

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