本文实例为大家分享了silverlight实现星星闪烁动画展示的具体代码，供大家参考，具体内容如下
原理很简单，生成1000个圆，从随机数来布置它们的位置，通过动画来处理它们的透明度，动画时长也是随机生成。
1、创建图形数组并设置背景透明，渐变笔触，大小等，而后加入到grid元素的子元素集中；
2、创建动画时间线；
3、加载完成后播放动画；
4、每一轮动画播放完毕后，重新随机生成一下图形的margin，动画的时间长度也是随机生成。
代码：
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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);
}
}
}
}
效果图：
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