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：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/tcjiaan/article/details/7101546
