PathAnimation

使用Blend制作PathAnimation

1：选中Path转换为运动路径

2：选择目标对象

PathAnimation使用动态的Path

PathAnimation动画在播放的时候，PahtGeometry是已经确定的，不会改变，不会实时的根据Path的改变动画进行调整，所以是不能进行绑定

只有在每一次需要播放动画之前读取相关的Path的Data，读取当前的PathGeometry然后开始动画

   <Path x:Name="path" Stroke="DarkGray" StrokeThickness="3">
            <Path.Data>
                <PathGeometry>
                    <PathFigure 
                        StartPoint="{Binding Center, ElementName=ptStart}">
                        <BezierSegment 
                            Point1="{Binding Center, ElementName=ptCtrl1}"
                            Point2="{Binding Center, ElementName=ptCtrl2}"
                            Point3="{Binding Center, ElementName=ptEnd}"/>
                    </PathFigure>
                </PathGeometry>
            </Path.Data>
        </Path>

 private void Button_Click(object sender, RoutedEventArgs e)
        {
            Canvas.SetLeft(this.truck, -this.truck.ActualWidth / 2);
            Canvas.SetTop(this.truck, -this.truck.ActualHeight / 2);
            this.truck.RenderTransformOrigin = new Point(0.5, 0.5);

            MatrixTransform matrix = new MatrixTransform();
            this.truck.RenderTransform = matrix;

            NameScope.SetNameScope(this, new NameScope());
            this.RegisterName("matrix", matrix);

            MatrixAnimationUsingPath matrixAnimation = new MatrixAnimationUsingPath();
            matrixAnimation.PathGeometry = this.path.Data.GetFlattenedPathGeometry();
            matrixAnimation.Duration = new Duration(TimeSpan.FromSeconds(5));

            //matrixAnimation.AutoReverse = true;   //重复
            //matrixAnimation.IsOffsetCumulative = !matrixAnimation.AutoReverse;
            //matrixAnimation.RepeatBehavior = RepeatBehavior.Forever;
            matrixAnimation.DoesRotateWithTangent = false;   //旋转

            Storyboard story = new Storyboard();
            story.Children.Add(matrixAnimation);
            Storyboard.SetTargetName(matrixAnimation, "matrix");
            Storyboard.SetTargetProperty(matrixAnimation, new PropertyPath(MatrixTransform.MatrixProperty));
            story.Begin(this);
        }