Silverlight放烟花,祝所有程序员新年快乐!!

      新的一年即将到来，我们也老了一岁，闲来无事，放个烟花庆祝自己又老了一岁，当然，除此之外还是有很多可以庆祝的。

      多余的话就不多说了，主要实现原理参考了JS放烟花的代码，但是烟花的播放自然是采用了Storyboard类啦~~，烟花就是一个Ellipse随机填充了一幅烟花效果图。实现过程相当简单，我也上传了代码，并且贴出主要的代码段：

构造烟花对象：

                ImageBrush imagebrush = new ImageBrush();

                Uri uri = new Uri(uris[random.Next(uris.Count)], UriKind.Relative);

                imagebrush.ImageSource = new BitmapImage(uri);

                ellipse.Fill = imagebrush;

                ellipse.Visibility = Visibility.Visible;

                ellipse.Width = 10;

                ellipse.Height = 10;

                ellipse.SetValue(Canvas.LeftProperty, this.X - ellipse.Width / 2);

                ellipse.SetValue(Canvas.TopProperty, this.Y);

                ((Canvas)this.Parent).Children.Add(ellipse);

                RandomPosition(ellipse);

开始播放烟花：

public void RandomPosition(Ellipse ellipse)

        {

            Storyboard mystoryboard = new Storyboard();

            mystoryboard.Completed += new EventHandler(mystoryboard_Completed);

            Duration dura = new Duration(new TimeSpan(00, 00, 00, 00, 1000));



            #region 放大渐变

            DoubleAnimation dua1 = new DoubleAnimation();

            dua1.Duration = dura;

            dua1.From = ellipse.Width;

            dua1.To = 250;



            DoubleAnimation dua2 = new DoubleAnimation();

            dua2.Duration = dura;

            dua2.From = ellipse.Height;

            dua2.To = 250;



            Storyboard.SetTarget(dua1, ellipse);

            Storyboard.SetTargetProperty(dua1, new PropertyPath("(Ellipse.Width)"));

            Storyboard.SetTarget(dua2, ellipse);

            Storyboard.SetTargetProperty(dua2, new PropertyPath("(Ellipse.Height)"));

            mystoryboard.Children.Add(dua1);

            mystoryboard.Children.Add(dua2);

            #endregion



            #region 透明渐变

            DoubleAnimation dua3 = new DoubleAnimation();

            dua3.Duration = dura;

            dua3.From = 1;

            dua3.To = 0;

            Storyboard.SetTarget(dua3, ellipse);

            Storyboard.SetTargetProperty(dua3, new PropertyPath("(Ellipse.Opacity)"));

            mystoryboard.Children.Add(dua3);

            #endregion



            #region 位置渐变

            DoubleAnimation dua4 = new DoubleAnimation();

            dua4.Duration = dura;

            dua4.From = this.X - ellipse.Width / 2;

            dua4.To = this.X - ellipse.Width - 100;

            Storyboard.SetTarget(dua4, ellipse);

            Storyboard.SetTargetProperty(dua4, new PropertyPath("(Canvas.Left)"));

            mystoryboard.Children.Add(dua4);



            DoubleAnimation dua5 = new DoubleAnimation();

            dua5.Duration = dura;

            dua5.From = this.Y;

            dua5.To = this.Y / 2 / 2;

            Storyboard.SetTarget(dua5, ellipse);

            Storyboard.SetTargetProperty(dua5, new PropertyPath("(Canvas.Top)"));

            mystoryboard.Children.Add(dua5);

            #endregion

            mystoryboard.Begin();

        }

 项目源代码下载

效果来了~~~