Silverlight学习笔记(1)-3.0放大缩小

Image.xaml

<Canvas x:Name="LayoutRoot">
 <Image Cursor="Hand" MouseEnter="imgLogo1_MouseEnter"  Canvas.ZIndex="1" x:Name="imgLogo1" Canvas.Left="100"       Canvas.Top="60"  Source="Image/logo1.jpg">
  <Image.RenderTransform>
   <ScaleTransform x:Name="LogoScale" CenterX="90" CenterY="96"></ScaleTransform>
  </Image.RenderTransform>
 </Image>
</Canvas>

Image.xaml.cs

private System.Windows.Threading.DispatcherTimer timer;
private ScaleDirection scaleDirection ;

public Page()
{  

　　 InitializeComponent();
 　　timer = new System.Windows.Threading.DispatcherTimer();
 　　timer.Interval = TimeSpan.FromMilliseconds(50);
 　　timer.Tick += new EventHandler(timer_Tick);
}

 

void timer_Tick(object sender, EventArgs e)
{
 　　AdjustScale(scaleDirection, LogoScale);
}

 

void AdjustScale(ScaleDirection scaleDirection, ScaleTransform scale)
{
 　　if (scaleDirection == ScaleDirection.Down)
 　　{
  　　　　if (scale.ScaleX < 1.3)
  　　　　{
    scale.ScaleX += 0.05; scale.ScaleY += 0.05;
   }
   else
   timer.Stop();
  }
  else
  {
   if (scale.ScaleX > 1.0)
   {
    scale.ScaleX -= 0.05; scale.ScaleY -= 0.05;
   }
   else
    timer.Stop();
  }
}

enum ScaleDirection
{
  Up, Down
}
private void imgLogo1_MouseEnter(object sender, MouseEventArgs e)
{
  scaleDirection = ScaleDirection.Down;
  timer.Start();
}