原文: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>

视觉动画：

        <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>

样式动画：

        <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>

基于帧的动画：

        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;

        }

    }

KeySpline：

  <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>

基于路径动画：

    <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>

旋转动画：

        <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>

布局动画：

        <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;

        }

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