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//創(chuàng)建X軸方向動(dòng)畫
doubleAnimation.From = currentPoint.X;
doubleAnimation.To = point.X;
doubleAnimation.Duration = new Duration(new TimeSpan(0, 0, 1));
Storyboard.SetTarget(doubleAnimation, darkMoon);
Storyboard.SetTargetProperty(doubleAnimation,
new PropertyPath("(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)"));
storyboard.Children.Add(doubleAnimation);

//創(chuàng)建Y軸方向動(dòng)畫
doubleAnimation = new DoubleAnimation();
doubleAnimation.SetValue(DoubleAnimation.FromProperty, currentPoint.Y);
doubleAnimation.SetValue(DoubleAnimation.ToProperty, point.Y);
doubleAnimation.SetValue(DoubleAnimation.DurationProperty, new Duration(new TimeSpan(0, 0, 1)));
Storyboard.SetTarget(doubleAnimation, darkMoon);
Storyboard.SetTargetProperty(doubleAnimation,
new PropertyPath("(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.Y)"));
storyboard.Children.Add(doubleAnimation);

storyboard.Begin();
}

下面再來一起學(xué)習(xí)一個(gè)稍微復(fù)雜點(diǎn)的二維向量運(yùn)動(dòng)，模擬屏幕內(nèi)有一小球，當(dāng)鼠標(biāo)在舞臺(tái)上點(diǎn)擊則小球以動(dòng)畫的形式移動(dòng)到鼠標(biāo)點(diǎn)擊處。

如下XAML定義：

<UserControl x:Class="SLV.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Canvas x:Name="LayoutRoot" Width="400" Height="400" Background="Black" MouseLeftButtonDown="OnMouseDown">
<Ellipse Fill="YellowGreen" x:Name="ellipse"
Width="20"
Height="20"
Canvas.Left="80"
Canvas.Top="66" >
</Ellipse>
</Canvas>
</UserControl>

其舞臺(tái)的鼠標(biāo)左鍵點(diǎn)擊事件代碼如下：

private void OnMouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
    //鼠標(biāo)點(diǎn)擊點(diǎn)坐標(biāo)
var mousePoint = e.GetPosition(null);
//當(dāng)前對(duì)象所在坐標(biāo)
var currentPoint = new Point((double)ellipse.GetValue(Canvas.LeftProperty), (double)ellipse.GetValue(Canvas.TopProperty));

Storyboard sb = new Storyboard();
//創(chuàng)建X坐標(biāo)方向動(dòng)畫
DoubleAnimation doubleAnimation = new DoubleAnimation();
doubleAnimation.From = currentPoint.X;
doubleAnimation.To = mousePoint.X;
doubleAnimation.Duration = new Duration(new TimeSpan(0, 0, 2));
Storyboard.SetTarget(doubleAnimation, ellipse);
Storyboard.SetTargetProperty(doubleAnimation, new PropertyPath("(Canvas.Left)"));

sb.Children.Add(doubleAnimation);
//創(chuàng)建Y坐標(biāo)方向動(dòng)畫
doubleAnimation = new DoubleAnimation();
doubleAnimation.From = currentPoint.Y;
doubleAnimation.To = mousePoint.Y;
doubleAnimation.Duration = new Duration(new TimeSpan(0, 0, 2));
Storyboard.SetTarget(doubleAnimation, ellipse);
Storyboard.SetTargetProperty(doubleAnimation, new PropertyPath("(Canvas.Top)"));
sb.Children.Add(doubleAnimation);

sb.Begin();
}

以上太陽的簡單位置變換移動(dòng)和小球隨鼠標(biāo)的移動(dòng)都可以理解為平面中向量的運(yùn)動(dòng)，只不過在實(shí)現(xiàn)上沒有直接通過向量的變換實(shí)現(xiàn)，而是通過Silverlight中提供的動(dòng)畫API實(shí)現(xiàn)，個(gè)人認(rèn)為，從某種角度可以將Silverlight中的動(dòng)畫API理解為Silverlight的向量API，動(dòng)畫API實(shí)現(xiàn)的平面動(dòng)畫理解為向量運(yùn)動(dòng)。

本文鏈接：http://m.95time.cn/tech/multimedia/2010/7670.asp　

出處：Microsoft
責(zé)任編輯：bluehearts

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