WPF之动画

线性关键帧、不连续关键帧动画：

    <Window.Triggers>
        <EventTrigger RoutedEvent="Window.Loaded">
            <EventTrigger.Actions>
                <BeginStoryboard>
                    <Storyboard>
                        <PointAnimationUsingKeyFrames Storyboard.TargetName="ellipse" Storyboard.TargetProperty="Fill.GradientOrigin"
                                           RepeatBehavior="Forever" >
                            <LinearPointKeyFrame Value="0.7,0.3" KeyTime="0:0:0"></LinearPointKeyFrame>
                            <LinearPointKeyFrame Value="0.3,0.7" KeyTime="0:0:5"></LinearPointKeyFrame>
                            <LinearPointKeyFrame Value="0.5,0.9" KeyTime="0:0:8"></LinearPointKeyFrame>
                            <LinearPointKeyFrame Value="0.9,0.6" KeyTime="0:0:10"></LinearPointKeyFrame>
                            <LinearPointKeyFrame Value="0.8,0.2" KeyTime="0:0:12"></LinearPointKeyFrame>
                            <LinearPointKeyFrame Value="0.7,0.3" KeyTime="0:0:14"></LinearPointKeyFrame>

                            <DiscretePointKeyFrame Value="0.7,0.3" KeyTime="0:0:20"></DiscretePointKeyFrame>
                            <DiscretePointKeyFrame Value="0.3,0.7" KeyTime="0:0:25"></DiscretePointKeyFrame>
                            <DiscretePointKeyFrame Value="0.5,0.9" KeyTime="0:0:28"></DiscretePointKeyFrame>
                            <DiscretePointKeyFrame Value="0.9,0.6" KeyTime="0:0:20"></DiscretePointKeyFrame>
                            <DiscretePointKeyFrame Value="0.8,0.2" KeyTime="0:0:22"></DiscretePointKeyFrame>
                            <DiscretePointKeyFrame Value="0.7,0.3" KeyTime="0:0:24"></DiscretePointKeyFrame>
                        </PointAnimationUsingKeyFrames>
                        <ColorAnimation Storyboard.TargetName="ellipse" Storyboard.TargetProperty="Fill.GradientStops[1].Color"
              To="Black"  Duration="0:0:10"
              AutoReverse="True" RepeatBehavior="Forever"></ColorAnimation>
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger.Actions>
        </EventTrigger>
    </Window.Triggers>
    <Grid>
        <Ellipse Name="ellipse" Margin="5" Grid.Row="1" Stretch="Uniform">
            <Ellipse.Fill>
                <RadialGradientBrush
             RadiusX="1" RadiusY="1" GradientOrigin="0.7,0.3">
                    <GradientStop Color="White" Offset="0" ></GradientStop>
                    <GradientStop Color="Blue" Offset="1" ></GradientStop>
                </RadialGradientBrush>
            </Ellipse.Fill>
        </Ellipse>
    </Grid>

        <Button Name="visual" HorizontalAlignment="Center" VerticalAlignment="Center">
            <Button.Content>Test</Button.Content>
            <Button.Triggers>
                <EventTrigger RoutedEvent="Button.Click">
                    <BeginStoryboard>
                        <Storyboard  RepeatBehavior="Forever">
                            <DoubleAnimation Storyboard.TargetName="rectangle"
                                 Storyboard.TargetProperty="RenderTransform.Children[0].AngleY"
                                 To="180" Duration="0:0:15" AutoReverse="True"></DoubleAnimation>
                            <DoubleAnimation Storyboard.TargetName="rectangle"
                                 Storyboard.TargetProperty="RenderTransform.Children[1].Angle"
                                 To="180" Duration="0:0:20" AutoReverse="True"></DoubleAnimation>
                            <DoubleAnimation Storyboard.TargetName="rectangle"
                                 Storyboard.TargetProperty="Opacity"
                                 To="0.1" Duration="0:0:4" AutoReverse="True"></DoubleAnimation>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Button.Triggers>
        </Button>

        <Rectangle Grid.Row="1" Name="rectangle" Width="100" Stretch="Uniform" ClipToBounds="False" RenderTransformOrigin="0.5,0.5">
            <Rectangle.Fill>
                <VisualBrush Visual="{Binding ElementName=visual}">

                </VisualBrush>
            </Rectangle.Fill>
            <Rectangle.RenderTransform>

                <TransformGroup>
                    <SkewTransform CenterX="0.5"></SkewTransform>
                    <RotateTransform CenterX="0.5" CenterY="0.5"></RotateTransform>
                </TransformGroup>

            </Rectangle.RenderTransform>
        </Rectangle>
    </Grid>

        <Style TargetType="{x:Type Button}">
            <Setter Property="HorizontalAlignment" Value="Center"></Setter>
            <Setter Property="RenderTransformOrigin" Value="0.5,0.5"></Setter>
            <Setter Property="Padding" Value="20,15"></Setter>
            <Setter Property="Margin" Value="2"></Setter>
            <Setter Property="Effect">
                <Setter.Value>
                    <BlurEffect Radius="10"></BlurEffect>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <EventTrigger RoutedEvent="Button.MouseEnter">
                    <EventTrigger.Actions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="Effect.Radius"
         To="0" Duration="0:0:0.4"></DoubleAnimation>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger.Actions>
                </EventTrigger>
                <EventTrigger RoutedEvent="Button.MouseLeave">
                    <EventTrigger.Actions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="Effect.Radius" To="10"
        Duration="0:0:0.2"></DoubleAnimation>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger.Actions>
                </EventTrigger>
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <StackPanel Margin="5">
        <Button>One</Button>
        <Button>Two</Button>
        <Button>Three</Button>
        <Button>Four</Button>
        <TextBlock Name="lbl" Margin="5"></TextBlock>
    </StackPanel>

  <Window.Triggers>
    <EventTrigger RoutedEvent="Window.Loaded">
      <EventTrigger.Actions>
        <BeginStoryboard>
          <Storyboard SpeedRatio="1.5">
            <DoubleAnimation Storyboard.TargetName="element"
                                Storyboard.TargetProperty="Opacity"
                                From="0.2" To="1" Duration="0:0:2.5"></DoubleAnimation>
            <DoubleAnimation Storyboard.TargetName="element"
                                Storyboard.TargetProperty="RenderTransform.Children[1].Angle"
                                From="70" To="0" Duration="0:0:2" ></DoubleAnimation>
            
            <DoubleAnimation Storyboard.TargetName="element"
                                Storyboard.TargetProperty="RenderTransform.Children[0].ScaleX"
                                From="0" To="1" Duration="0:0:2" AccelerationRatio="1"></DoubleAnimation>
            <DoubleAnimation Storyboard.TargetName="element"
                                Storyboard.TargetProperty="RenderTransform.Children[0].ScaleY"
                                From="0" To="1" Duration="0:0:2" AccelerationRatio="1"></DoubleAnimation>
            
            <DoubleAnimation Storyboard.TargetName="element"
                                            Storyboard.TargetProperty="RenderTransform.Children[0].ScaleX"
                                            To="0.98" BeginTime="0:0:2" Duration="0:0:0.05"  DecelerationRatio="1"></DoubleAnimation>
            <DoubleAnimation Storyboard.TargetName="element"
                                Storyboard.TargetProperty="RenderTransform.Children[0].ScaleY"
                                To="0.98" BeginTime="0:0:2" Duration="0:0:0.05" DecelerationRatio="1"></DoubleAnimation>
            <DoubleAnimation Storyboard.TargetName="element"
                                            Storyboard.TargetProperty="RenderTransform.Children[0].ScaleX"
                                            To="1" BeginTime="0:0:2.05" Duration="0:0:0.2"  AccelerationRatio="1"></DoubleAnimation>
            <DoubleAnimation Storyboard.TargetName="element"
                                Storyboard.TargetProperty="RenderTransform.Children[0].ScaleY"
                                To="1" BeginTime="0:0:2.05" Duration="0:0:0.2" AccelerationRatio="1"></DoubleAnimation>

          </Storyboard>
        </BeginStoryboard>
      </EventTrigger.Actions>
    </EventTrigger>
  </Window.Triggers>

    <Window.Triggers>
        <EventTrigger RoutedEvent="Window.Loaded">
            <EventTrigger.Actions>
                <BeginStoryboard>
                    <Storyboard SpeedRatio="1.5" Completed="storyboardCompleted">
                        <DoubleAnimation Storyboard.TargetName="rectangle"
                                Storyboard.TargetProperty="Opacity"
                                From="0.2" To="1" Duration="0:0:2.5"></DoubleAnimation>
                        <DoubleAnimation Storyboard.TargetName="rectangle"
                                Storyboard.TargetProperty="RenderTransform.Children[1].Angle"
                                From="70" To="0" Duration="0:0:2" ></DoubleAnimation>

                        <DoubleAnimation Storyboard.TargetName="rectangle"
                                Storyboard.TargetProperty="RenderTransform.Children[0].ScaleX"
                                From="0" To="1" Duration="0:0:2" AccelerationRatio="1"></DoubleAnimation>
                        <DoubleAnimation Storyboard.TargetName="rectangle"
                                Storyboard.TargetProperty="RenderTransform.Children[0].ScaleY"
                                From="0" To="1" Duration="0:0:2" AccelerationRatio="1"></DoubleAnimation>

                        <DoubleAnimation Storyboard.TargetName="rectangle"
                                            Storyboard.TargetProperty="RenderTransform.Children[0].ScaleX"
                                            To="0.98" BeginTime="0:0:2" Duration="0:0:0.05"  DecelerationRatio="1"></DoubleAnimation>
                        <DoubleAnimation Storyboard.TargetName="rectangle"
                                Storyboard.TargetProperty="RenderTransform.Children[0].ScaleY"
                                To="0.98" BeginTime="0:0:2" Duration="0:0:0.05" DecelerationRatio="1"></DoubleAnimation>
                        <DoubleAnimation Storyboard.TargetName="rectangle"
                                            Storyboard.TargetProperty="RenderTransform.Children[0].ScaleX"
                                            To="1" BeginTime="0:0:2.05" Duration="0:0:0.2"  AccelerationRatio="1"></DoubleAnimation>
                        <DoubleAnimation Storyboard.TargetName="rectangle"
                                Storyboard.TargetProperty="RenderTransform.Children[0].ScaleY"
                                To="1" BeginTime="0:0:2.05" Duration="0:0:0.2" AccelerationRatio="1"></DoubleAnimation>
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger.Actions>
        </EventTrigger>
    </Window.Triggers>

        private bool rendering = false;
        private void cmdStart_Clicked(object sender, RoutedEventArgs e)
        {
            if (!rendering)
            {
                ellipses.Clear();
                canvas.Children.Clear();

                CompositionTarget.Rendering += RenderFrame;
                rendering = true;
            }
        }
        private void cmdStop_Clicked(object sender, RoutedEventArgs e)
        {
            StopRendering();
        }

        private void StopRendering()
        {
            CompositionTarget.Rendering -= RenderFrame;
            rendering = false;            
        }
                
        private List<EllipseInfo> ellipses = new List<EllipseInfo>();
        
        private double accelerationY = 0.1;
        private int minStartingSpeed = 1;
        private int maxStartingSpeed = 50;
        private double speedRatio = 0.1;
        private int minEllipses = 20;
        private int maxEllipses = 100;        
        private int ellipseRadius = 10;
            
        private void RenderFrame(object sender, EventArgs e)
        {
            if (ellipses.Count == 0)
            {
                // Animation just started. Create the ellipses.
                int halfCanvasWidth = (int)canvas.ActualWidth / 2;                
                
                Random rand = new Random();
                int ellipseCount = rand.Next(minEllipses, maxEllipses+1);
                for (int i = 0; i < ellipseCount; i++)
                {
                    Ellipse ellipse = new Ellipse();
                    ellipse.Fill = Brushes.LimeGreen;
                    ellipse.Width = ellipseRadius;
                    ellipse.Height = ellipseRadius;
                    Canvas.SetLeft(ellipse, halfCanvasWidth + rand.Next(-halfCanvasWidth, halfCanvasWidth));
                    Canvas.SetTop(ellipse, 0);
                    canvas.Children.Add(ellipse);

                    EllipseInfo info = new EllipseInfo(ellipse, speedRatio * rand.Next(minStartingSpeed, maxStartingSpeed));
                    ellipses.Add(info);
                }
            }
            else
            {
                for (int i = ellipses.Count-1; i >= 0; i--)                
                {
                    EllipseInfo info = ellipses[i];
                    double top = Canvas.GetTop(info.Ellipse);
                    Canvas.SetTop(info.Ellipse, top + 1 * info.VelocityY);                    

                    if (top >= (canvas.ActualHeight - ellipseRadius*2 - 10))
                    {
                        // This circle has reached the bottom.
                        // Stop animating it.
                        ellipses.Remove(info);
                    }
                    else
                    {
                        // Increase the velocity.
                        info.VelocityY += accelerationY;
                    }

                    if (ellipses.Count == 0)
                    {
                        // End the animation.
                        // There‘s no reason to keep calling this method
                        // if it has no work to do.
                        StopRendering();
                    }
                }
            }
        }
    }

    public class EllipseInfo
    {        
        public Ellipse Ellipse
        {
            get; set;
        }
                
        public double VelocityY
        {
            get; set;
        }

        public EllipseInfo(Ellipse ellipse, double velocityY)
        {
            VelocityY = velocityY;
            Ellipse = ellipse;
        }
    }

  <Window.Triggers>
    <EventTrigger RoutedEvent="Window.Loaded">
      <EventTrigger.Actions>
        <BeginStoryboard>
          <Storyboard>
            <DoubleAnimationUsingKeyFrames
             Storyboard.TargetName="ellipse1" Storyboard.TargetProperty="(Canvas.Left)" >
              <SplineDoubleKeyFrame KeyTime="0:0:5" Value="250" KeySpline="0.25,0 0.5,0.7"></SplineDoubleKeyFrame>
              <SplineDoubleKeyFrame KeyTime="0:0:10" Value="500" KeySpline="0.25,0.8 0.2,0.4"></SplineDoubleKeyFrame>
            </DoubleAnimationUsingKeyFrames>

            <DoubleAnimation
            Storyboard.TargetName="ellipse2" Storyboard.TargetProperty="(Canvas.Left)"
            To="500" Duration="0:0:10">              
            </DoubleAnimation>
          </Storyboard>
        </BeginStoryboard>
      </EventTrigger.Actions>
    </EventTrigger>
  </Window.Triggers>
  <Canvas Margin="10">
    <Ellipse Name="ellipse1" Canvas.Left="0" Fill="Red" Width="10" Height="10"></Ellipse>
    
    <Path Stroke="Blue" StrokeThickness="1" StrokeDashArray="2 1" Canvas.Top="25">
      <Path.Data>
        <PathGeometry>
          <PathFigure>
            <BezierSegment Point1="25,0" Point2="50,70" Point3="100,100" />
          </PathFigure>
        </PathGeometry>
      </Path.Data>
      <Path.RenderTransform>
        <ScaleTransform ScaleX="2.5"></ScaleTransform>
      </Path.RenderTransform>
    </Path>
    <Path Stroke="Blue" StrokeThickness="1" StrokeDashArray="2 1" Canvas.Left="250" Canvas.Top="25">
      <Path.Data>
        <PathGeometry>
          <PathFigure>            
            <BezierSegment Point1="25,80" Point2="20,40" Point3="100,100" />
          </PathFigure>
        </PathGeometry>
      </Path.Data>
      <Path.RenderTransform>
        <ScaleTransform ScaleX="2.5"></ScaleTransform>
      </Path.RenderTransform>
    </Path>
    
    <Ellipse Name="ellipse2" Canvas.Top="150" Canvas.Left="0" Fill="Red" Width="10" Height="10"></Ellipse>
  </Canvas>

    <Window.Resources>
        <PathGeometry x:Key="path">
            <PathFigure IsClosed="True">
                <ArcSegment Point="100,200" Size="15,10" SweepDirection="Clockwise"></ArcSegment>
                <ArcSegment Point="400,50" Size="5,5" ></ArcSegment>
            </PathFigure>
        </PathGeometry>
    </Window.Resources>
    <Window.Triggers>
        <EventTrigger RoutedEvent="Window.Loaded">
            <EventTrigger.Actions>
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimationUsingPath Storyboard.TargetName="image"
                                      Storyboard.TargetProperty="(Canvas.Left)"
                                     PathGeometry="{StaticResource path}"
                                      Duration="0:0:5" RepeatBehavior="Forever" Source="X" />
                        <DoubleAnimationUsingPath Storyboard.TargetName="image"
                                      Storyboard.TargetProperty="(Canvas.Top)"
                                     PathGeometry="{StaticResource path}"
                                      Duration="0:0:5" RepeatBehavior="Forever" Source="Y" />
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger.Actions>
        </EventTrigger>
    </Window.Triggers>
    <Canvas Margin="10">
        <Path Stroke="Red" StrokeThickness="1" Data="{StaticResource path}" Canvas.Top="10" Canvas.Left="10">
        </Path>
        <Image Name="image">
            <Image.Source>
                <DrawingImage>
                    <DrawingImage.Drawing>
                        <GeometryDrawing Brush="LightSteelBlue">
                            <GeometryDrawing.Geometry>
                                <GeometryGroup>
                                    <EllipseGeometry Center="10,10" RadiusX="9" RadiusY="4" />
                                    <EllipseGeometry Center="10,10" RadiusX="4" RadiusY="9" />
                                </GeometryGroup>
                            </GeometryDrawing.Geometry>
                            <GeometryDrawing.Pen>
                                <Pen Thickness="1" Brush="Black" />
                            </GeometryDrawing.Pen>
                        </GeometryDrawing>
                    </DrawingImage.Drawing>
                </DrawingImage>
            </Image.Source>
        </Image>
    </Canvas>

        <Style TargetType="{x:Type Button}">
            <Setter Property="HorizontalAlignment" Value="Center"></Setter>
            <Setter Property="RenderTransformOrigin" Value="0.5,0.5"></Setter>
            <Setter Property="Padding" Value="20,15"></Setter>
            <Setter Property="Margin" Value="2"></Setter>
            <Setter Property="RenderTransform">
                <Setter.Value>
                    <RotateTransform></RotateTransform>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <EventTrigger RoutedEvent="Button.MouseEnter">
                    <EventTrigger.Actions>
                        <BeginStoryboard Name="rotateStoryboardBegin">
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="RenderTransform.Angle"
                 To="360" Duration="0:0:0.8" RepeatBehavior="Forever"></DoubleAnimation>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger.Actions>
                </EventTrigger>
                <EventTrigger RoutedEvent="Button.MouseLeave">
                    <EventTrigger.Actions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="RenderTransform.Angle"
                   Duration="0:0:0.2"></DoubleAnimation>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger.Actions>
                </EventTrigger>
            </Style.Triggers>
        </Style>

    </Window.Resources>
    <StackPanel Margin="5" Button.Click="cmd_Clicked">
        <Button>One</Button>
        <Button>Two</Button>
        <Button>Three</Button>
        <Button>Four</Button>
        <TextBlock Name="lbl" Margin="5"></TextBlock>
    </StackPanel>

        <Style TargetType="{x:Type Button}">
            <Setter Property="HorizontalAlignment" Value="Center"></Setter>
            <Setter Property="RenderTransformOrigin" Value="0.5,0.5"></Setter>
            <Setter Property="Padding" Value="20,15"></Setter>
            <Setter Property="Margin" Value="2"></Setter>
            <Setter Property="LayoutTransform">
                <Setter.Value>
                    <RotateTransform></RotateTransform>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <EventTrigger RoutedEvent="Button.MouseEnter">
                    <EventTrigger.Actions>
                        <BeginStoryboard Name="rotateStoryboardBegin">
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="LayoutTransform.Angle"
                 To="360" Duration="0:0:0.8" RepeatBehavior="Forever"></DoubleAnimation>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger.Actions>
                </EventTrigger>
                <EventTrigger RoutedEvent="Button.MouseLeave">
                    <EventTrigger.Actions>
                        <!-- <RemoveStoryboard BeginStoryboardName="rotateStoryboardBegin"></RemoveStoryboard> -->
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="LayoutTransform.Angle"
                   Duration="0:0:0.2"></DoubleAnimation>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger.Actions>
                </EventTrigger>
            </Style.Triggers>
        </Style>

    </Window.Resources>
    <StackPanel Margin="5" Button.Click="cmd_Clicked">
        <Button>One</Button>
        <Button>Two</Button>
        <Button>Three</Button>
        <Button>Four</Button>
        <TextBlock Name="lbl" Margin="5"></TextBlock>
    </StackPanel>

        private void cmd_Clicked(object sender, RoutedEventArgs e)
        {
            lbl.Text = "You clicked: " + ((Button)e.OriginalSource).Content;
        }