WPF编游戏系列 之七 动画效果（2）

       上一篇已经对关闭窗口图标进行了动画效果处理，本篇将对窗口界面的显示和关闭效果进行处理。由于所有的动画效果都是针对窗口界面的Canvas，所以先要为它添加一些RenderTranform属性，这些属性不要填写任何效果，后面会由Storyboard和EventTrigger为其提供。

<Canvas Name="queryCanvas" Visibility="Collapsed" RenderTransformOrigin="0.5,0.5">
   <!-- TransformGroup都定义在这里 -->
   <Canvas.RenderTransform>
      <TransformGroup>
          <ScaleTransform></ScaleTransform>
          <RotateTransform></RotateTransform>
      </TransformGroup>
   </Canvas.RenderTransform>
   <!-- 下面是窗口界面代码 -->
   <Border Name="queryBorder" BorderThickness="9" CornerRadius="9" 
           Width="920" Height="440" Canvas.Left="40" Canvas.Top="160">
      <ScrollViewer Name="queryScrollViewer" 
                    ScrollViewer.VerticalScrollBarVisibility="Visible">
          <StackPanel Orientation="Vertical">
              <!-- 我就是那个关闭窗口图标，你不认识我啦！ -->
              <Image Source="image/close.png" Name="closeImage" Height="20" Width="20"
                     Cursor="Hand" Margin="5" HorizontalAlignment="Right">
                  <Image.ToolTip>Close</Image.ToolTip>
              </Image>
              <Grid Name="queryGrid"></Grid>
           </StackPanel>
       </ScrollViewer>
   </Border>
</Canvas>

1. 下面就要在Window.Resources中为显示和关闭效果添加Storyboard了，其中showQueryCanvas就是显示效果，closeQueryCanvas是关闭效果。另，程序中涉及到的RenderTransform.Children[0]和[1]，就是上面Resources里的ScaleTransform和RotataTransform。

<Window.Resources>
    ... ... 
    <Storyboard x:Key="showQueryCanvas">
       <DoubleAnimation Storyboard.TargetName="queryCanvas"
                        Storyboard.TargetProperty="Opacity"
                        From="0.2" To="1" Duration="0:0:2.5">
       </DoubleAnimation>
       <DoubleAnimation Storyboard.TargetName="queryCanvas"
                        Storyboard.TargetProperty="RenderTransform.Children[1].Angle"
                        From="70" To="0" Duration="0:0:2" >
       </DoubleAnimation>
       <DoubleAnimation Storyboard.TargetName="queryCanvas"
                        Storyboard.TargetProperty="RenderTransform.Children[0].ScaleX"
                        From="0" To="1" Duration="0:0:2" 
                        AccelerationRatio="1">
       </DoubleAnimation>
       <DoubleAnimation Storyboard.TargetName="queryCanvas"
                        Storyboard.TargetProperty="RenderTransform.Children[0].ScaleY"
                        From="0" To="1" Duration="0:0:2" 
                        AccelerationRatio="1">
       </DoubleAnimation>
       <DoubleAnimation Storyboard.TargetName="queryCanvas"
                        Storyboard.TargetProperty="RenderTransform.Children[0].ScaleX"
                        To="0.98" BeginTime="0:0:2" Duration="0:0:0.05" 
                        DecelerationRatio="1">
       </DoubleAnimation>
       <DoubleAnimation Storyboard.TargetName="queryCanvas"
                        Storyboard.TargetProperty="RenderTransform.Children[0].ScaleY"
                        To="0.98" BeginTime="0:0:2" Duration="0:0:0.05" 
                        DecelerationRatio="1">
       </DoubleAnimation>
       <DoubleAnimation Storyboard.TargetName="queryCanvas"
                        Storyboard.TargetProperty="RenderTransform.Children[0].ScaleX"
                        To="1" BeginTime="0:0:2.05" Duration="0:0:0.2"  
                        AccelerationRatio="1">
       </DoubleAnimation>
       <DoubleAnimation Storyboard.TargetName="queryCanvas"              
                        Storyboard.TargetProperty="RenderTransform.Children[0].ScaleY"
                        To="1" BeginTime="0:0:2.05" Duration="0:0:0.2" 
                        AccelerationRatio="1">
       </DoubleAnimation>
   </Storyboard>

   <Storyboard x:Key="closeQueryCanvas">
      <DoubleAnimation Storyboard.TargetName="queryCanvas" 
                       Storyboard.TargetProperty="RenderTransform.Children[1].Angle"
                       To="360" Duration="0:0:1.5" >
      </DoubleAnimation>
      <DoubleAnimation Storyboard.TargetName="queryCanvas" 
                       Storyboard.TargetProperty="Opacity"
                       To="0" Duration="0:0:3">
      </DoubleAnimation>
      <DoubleAnimation Storyboard.TargetName="queryCanvas" 
                       Storyboard.TargetProperty="RenderTransform.Children[0].ScaleX"
                       To="0" Duration="0:0:1.5" AccelerationRatio="1">
      </DoubleAnimation>
      <DoubleAnimation Storyboard.TargetName="queryCanvas"
                       Storyboard.TargetProperty="RenderTransform.Children[0].ScaleY"
                       To="0" Duration="0:0:1.5" AccelerationRatio="1">
      </DoubleAnimation>
   </Storyboard>
</Window.Resources>

2. 效果Over，就要启动事件了。关闭事件已经在上一篇写到关闭窗口图标事件中了，本篇只介绍显示效果事件。显示事件也同样定义到Window.Triggers中。下面程序中myHome、myShop、upgradeShop、myBank为程序上方四个图标的Name值。

<Window.Triggers>
   <!-- 关闭窗口图标事件就写在这里 -->
   ... ... 
   <EventTrigger SourceName="closeImage" RoutedEvent="Image.MouseLeftButtonDown">
      <BeginStoryboard Name="closeQueryCanvasStoryboard" 
                       Storyboard="{StaticResource closeQueryCanvas}">
      </BeginStoryboard>
   </EventTrigger>

   <!-- 下面是显示窗口事件 -->
   <EventTrigger SourceName="myHome" RoutedEvent="Image.MouseLeftButtonDown">
      <BeginStoryboard Storyboard="{StaticResource showQueryCanvas}"></BeginStoryboard>
   </EventTrigger>
   <EventTrigger SourceName="myShop" RoutedEvent="Image.MouseLeftButtonDown">
      <BeginStoryboard Storyboard="{StaticResource showQueryCanvas}"></BeginStoryboard>
   </EventTrigger>
   <EventTrigger SourceName="upgradeShop" RoutedEvent="Image.MouseLeftButtonDown">
      <BeginStoryboard Storyboard="{StaticResource showQueryCanvas}"></BeginStoryboard>
   </EventTrigger>
   <EventTrigger SourceName="myBank" RoutedEvent="Image.MouseLeftButtonDown">
      <BeginStoryboard Storyboard="{StaticResource showQueryCanvas}"></BeginStoryboard>
   </EventTrigger>
</Window.Triggers>

3. 显示窗口效果

4. 关闭窗口效果

待续 … …