Silverlight之我见——制作星星闪烁动画

本文主要是介绍Silverlight之我见——制作星星闪烁动画，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes; 
namespace RandEllipseSample
{
public partial class MainPage : UserControl
{
int shapesCount = 500; //图形数组的容量
//随机大小的上限
int theMaxW = 1300;
int theMaxH = 720;
Random rand = null;
Storyboard story = null;
Ellipse[] myShapes = null;
public MainPage()
{
InitializeComponent();
rand = new Random();
story = new Storyboard();
story.Completed += new EventHandler(story_Completed);
InitShapes();
InitAnimation();
//加载完成后马上播放动画
this.Loaded += new RoutedEventHandler(MainPage_Loaded);
} 
void MainPage_Loaded(object sender, RoutedEventArgs e)
{
story.Begin();
} 
void story_Completed(object sender, EventArgs e)
{
for (int x = 0; x < shapesCount; x++)
{
myShapes[x].Margin = new Thickness(Convert.ToDouble(rand.Next(0, theMaxW)), Convert.ToDouble(rand.Next(0, theMaxH)), 0, 0);
}
InitAnimation();
} 
/// <summary>
/// 初始化形状数组
/// </summary>
private void InitShapes()
{
myShapes = new Ellipse[shapesCount];
//实例化所有成员
for (int n = 0; n < shapesCount; n++)
{
myShapes[n] = new Ellipse();
myShapes[n].Fill = new SolidColorBrush(Colors.Transparent);
myShapes[n].StrokeThickness = 2d;
//笔触为线性渐变
LinearGradientBrush gBrush = new LinearGradientBrush();
gBrush.StartPoint = new Point(0, 0);
gBrush.EndPoint = new Point(1, 1);
gBrush.GradientStops.Add(new GradientStop()
{
Color = Colors.Yellow,
Offset = 0
});
gBrush.GradientStops.Add(new GradientStop()
{
Color = Colors.Red,
Offset = 0.25
});
gBrush.GradientStops.Add(new GradientStop()
{
Color = Colors.White,
Offset = 0.5
});
gBrush.GradientStops.Add(new GradientStop()
{
Color = Colors.Blue,
Offset = 0.75
});
myShapes[n].Stroke = gBrush;
//位置
myShapes[n].Margin = new Thickness(Convert.ToDouble(rand.Next(0,theMaxW)), Convert.ToDouble(rand.Next(0,theMaxH)), 0, 0);
//大小
myShapes[n].Width = 10;
myShapes[n].Height = 10;
myShapes[n].HorizontalAlignment = HorizontalAlignment.Left;
myShapes[n].VerticalAlignment = VerticalAlignment.Top;
//加入可视化树
this.LayoutRoot.Children.Add(myShapes[n]);
}
} 
/// <summary>
/// 初始化动画
/// </summary>
private void InitAnimation()
{
story.Children.Clear();
for (int i = 0; i < shapesCount; i++)
{
int mSecond = rand.Next(0, 5);
//透明度
DoubleAnimation opacityAnimate = new DoubleAnimation();
opacityAnimate.From = 1.0;
opacityAnimate.To = 0.0;
Storyboard.SetTarget(opacityAnimate, myShapes[i]);
Storyboard.SetTargetProperty(opacityAnimate,
new PropertyPath("Opacity"));
opacityAnimate.Duration = new Duration(TimeSpan.FromSeconds(mSecond));
opacityAnimate.RepeatBehavior = RepeatBehavior.Forever; 
//将时间线添加到情节摘要
story.Children.Add(opacityAnimate);
}
}
}
}

 

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