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

 1    <Path x:Name="path" Stroke="DarkGray" StrokeThickness="3">
 2             <Path.Data>
 3                 <PathGeometry>
 4                     <PathFigure 
 5                         StartPoint="{Binding Center, ElementName=ptStart}">
 6                         <BezierSegment 
 7                             Point1="{Binding Center, ElementName=ptCtrl1}"
 8                             Point2="{Binding Center, ElementName=ptCtrl2}"
 9                             Point3="{Binding Center, ElementName=ptEnd}"/>
10                     </PathFigure>
11                 </PathGeometry>
12             </Path.Data>
13         </Path>

 1  private void Button_Click(object sender, RoutedEventArgs e)
 2         {
 3             Canvas.SetLeft(this.truck, -this.truck.ActualWidth / 2);
 4             Canvas.SetTop(this.truck, -this.truck.ActualHeight / 2);
 5             this.truck.RenderTransformOrigin = new Point(0.5, 0.5);
 6 
 7             MatrixTransform matrix = new MatrixTransform();
 8             this.truck.RenderTransform = matrix;
 9 
10             NameScope.SetNameScope(this, new NameScope());
11             this.RegisterName("matrix", matrix);
12 
13             MatrixAnimationUsingPath matrixAnimation = new MatrixAnimationUsingPath();
14             matrixAnimation.PathGeometry = this.path.Data.GetFlattenedPathGeometry();
15             matrixAnimation.Duration = new Duration(TimeSpan.FromSeconds(5));
16 
17             //matrixAnimation.AutoReverse = true;   //重复
18             //matrixAnimation.IsOffsetCumulative = !matrixAnimation.AutoReverse;
19             //matrixAnimation.RepeatBehavior = RepeatBehavior.Forever;
20             matrixAnimation.DoesRotateWithTangent = false;   //旋转
21 
22             Storyboard story = new Storyboard();
23             story.Children.Add(matrixAnimation);
24             Storyboard.SetTargetName(matrixAnimation, "matrix");
25             Storyboard.SetTargetProperty(matrixAnimation, new PropertyPath(MatrixTransform.MatrixProperty));
26             story.Begin(this);
27         }