基于vs和C#的WPF应用之动画4---跳跳球

一、画布和图形

 <Canvas x:Name="canvas4" Grid.Row="1" Grid.Column="1"   Width="200" Height="200">
            <Canvas.Triggers>
                <EventTrigger RoutedEvent="Loaded">
                    <BeginStoryboard Storyboard="{StaticResource fourth_sb}"/>
                </EventTrigger>
            </Canvas.Triggers>
            
            <Label Content="Loading"
           FontSize="16"
           FontFamily="Times New Roman"
           Foreground="#ffb549"
           FontWeight="Bold"
           Width="200"
           HorizontalContentAlignment="Center"
           Canvas.Top="110"/>

            <E