炫彩效果——窗体淡入淡出

　　在实际项目中，经常会有窗体弹出，为了不显得那么突兀，可以给加些动画过度效果，淡入淡出就是一种比较常见的动画。

 1 using System; 2 using System.Windows.Forms; 3  4 namespace TestFormEffect 5 { 6   public partial class Form1 : Form 7   { 8     private readonly Timer _timer; 9     private readonly double _inspeed;10     private readonly double _outspeed;11 12     private State _state;13 14     public const float Precision = 0.000001f;15 16     public Form1()17     {18       InitializeComponent();19       _timer=new Timer();20       _timer.Tick += timer1_Tick; 21       _timer.Enabled = false;22 23       _inspeed = 20;24       _outspeed = 20;25     }26 27     private void Form1_Load(object sender, EventArgs e)28     {29       _state = State.In;30       _timer.Enabled = true;31       Opacity = 0;32     }33 34     private void timer1_Tick(object sender, EventArgs e)35     {36       switch (_state)37       {38         case State.In:39           Opacity += _inspeed/100;40           if (1 - Opacity <= Precision)41           {42             _timer.Enabled = false;43           }44           break;45         case State.Out:46           Opacity -= _outspeed/100;47           if (Opacity <= Precision)48           {49             this.Close();50             _timer.Enabled = false;51           }52           break;53       }54     }55 56     private void Form1_FormClosing(object sender, FormClosingEventArgs e)57     {58       e.Cancel = true;59       _state = State.Out;60       _timer.Enabled = true;61     }62 63   }64 65   enum State66   {67     In=1,68     Out69   }70 }

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原标题：炫彩效果——窗体淡入淡出

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