一起学Windows phone7开发（五.一个时钟的例子）

Express blend工具是开发silverlight Ui的重要工具，在这里有一个从silverlight移植过来的时钟小例子可以看出在Phone7上这个工具一样也很重要并且可以提高开发效率。

一．在blend工具中，可以用Ellipse绘制表盘,通过在property中使用渐变色来产生立体效果。还可以能过gradient工具来调整渐变色。







二．用Ellipse工具绘制表针轴，并设置圆的strokethickness来改变线的粗细。



三．用Rectangle工具来绘制三个表针，并放好位置。



四．增加动画效果

<Storyboard x:Name="clockStoryboard">

<!-- This animation targets the hour hand transform -->

<DoubleAnimation x:Name="hourAnimation"

Storyboard.TargetName="HourHandTransform"

Storyboard.TargetProperty="Angle"

Duration="12:0:0" RepeatBehavior="Forever" To="360" />

<!-- This animation targets the minute hand transform -->

<DoubleAnimation x:Name="minuteAnimation"

Storyboard.TargetName="MinuteHandTransform"

Storyboard.TargetProperty="Angle"

Duration="1:0:0" RepeatBehavior="Forever" To="360" />

<!-- This animation targets the second hand transform -->

<DoubleAnimation x:Name="secondAnimation"

Storyboard.TargetName="SecondHandTransform"

Storyboard.TargetProperty="Angle"

Duration="0:1:0" RepeatBehavior="Forever" To="360" />

</Storyboard>

这时运行一下，已经可以看到表针在走了。

五．控制表针行为语句

void MainPage_Loaded(object sender, RoutedEventArgs e)

{

// The current date and time.

System.DateTime currentDate = DateTime.Now;

// Find the appropriate angle (in degrees) for the hour hand

// based on the current time.

double hourangle = (((float)currentDate.Hour) / 12) * 360 + currentDate.Minute / 2;

// The same as for the minute angle.

double minangle = (((float)currentDate.Minute) / 60) * 360;

// The same for the second angle.

double secangle = (((float)currentDate.Second) / 60) * 360;

// Set the beginning of the animation (From property) to the angle

// corresponging to the current time.

hourAnimation.From = hourangle;

// Set the end of the animation (To property)to the angle

// corresponding to the current time PLUS 360 degrees. Thus, the

// animation will end after the clock hand moves around the clock

// once. Note: The RepeatBehavior property of the animation is set

// to "Forever" so the animation will begin again as soon as it completes.

hourAnimation.To = hourangle + 360;

// Same as with the hour animation.

minuteAnimation.From = minangle;

minuteAnimation.To = minangle + 360;

// Same as with the hour animation.

secondAnimation.From = secangle;

secondAnimation.To = secangle + 360;

this.clockStoryboard.Begin();

}

源代码：

/Files/randylee/MyClock.rar

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