在做一个WinForm登录框时，突然想到，如果有黑客帝国中字符雨的特效做背景，那应该蛮Cool的，所以就有了如下代码，随意写的，有点乱。
public
partial
class
CharacterRain : Component
{
/**//// 
/// 必需的设计器变量。
/// private System.ComponentModel.IContainer components = null; /**//// /// 清理所有正在使用的资源。 /// /// protected override void Dispose(bool disposing) { if (RainThread != null && RainThread.IsAlive) Stop(); if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); } 组件设计器生成的代码#region 组件设计器生成的代码 /**//// /// 设计器支持所需的方法 - 不要 /// 使用代码编辑器修改此方法的内容。 /// private void InitializeComponent() { components = new System.ComponentModel.Container(); } #endregion public CharacterRain() { Initialize(); InitializeComponent(); } public CharacterRain(IContainer container) { Initialize(); container.Add(this); InitializeComponent(); } private object BMPLock = new object(); private Bitmap BMP; private Graphics Graph; private void Initialize() { this.DrawRainEvent = new EventHandler(CharacterRainPanel_DrawRainEvent); OnPaint = new PaintEventHandler(ShowWindow_Paint); } private PaintEventHandler OnPaint; private char[] CHARACTERS = { '`', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', '\\', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', '~', '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', '|', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', 'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?' }; private static readonly Random Rand = new Random(); private Control _ShowWindow = null; /**//// /// 获取、设置用于显示字符雨的窗口（或控件） /// public Control ShowWindow { get { return _ShowWindow; } set { if (_ShowWindow != null) _ShowWindow.Paint -= OnPaint; _ShowWindow = value; if (_ShowWindow != null) _ShowWindow.Paint += OnPaint; } } void ShowWindow_Paint(object sender, PaintEventArgs e) { //Paint(); if (BMP != null) { lock (BMPLock) { //e.Graphics.Clear(_ShowWindow.BackColor); try { e.Graphics.DrawImage(BMP, 0, 0); } catch { } } } } private string _RainCharacters = "`1234567890-=\\qwertyuiop[]asdfghjkl;'zxcvbnm,./~!@#$%^&*()_+|QWERTYUIOP{}ASDFGHJKL:\"ZXCVBNM<>?"; /**//// /// 获取、设置字符雨中可能出现的字符 /// public string RainCharacters { get { return _RainCharacters; } set { if (string.IsNullOrEmpty(value)) value = "`1234567890-=\\qwertyuiop[]asdfghjkl;'zxcvbnm,./~!@#$%^&*()_+|QWERTYUIOP{}ASDFGHJKL:\"ZXCVBNM<>?"; _RainCharacters = value; CHARACTERS = value.ToCharArray(); } } private Color _RainHeadColor = Color.Lime; /**//// /// 获取、设置字符雨头的颜色 /// public Color RainHeadColor { get { return _RainHeadColor; } set { if (!Running) _RainHeadColor = value; else throw new Exception("运行中不可以更改颜色。"); } } private Color _RainBodyColor = Color.Green; /**//// /// 获取、设置字符雨体的颜色 /// public Color RainBodyColor { get { return _RainBodyColor; } set { if (!Running) _RainBodyColor = value; else throw new Exception("运行中不可以更改颜色。"); } } private Color _RainTailColor = Color.DarkGreen; /**//// /// 获取、设置字符雨体的颜色 /// public Color RainTailColor { get { return _RainTailColor; } set { if (!Running) _RainTailColor = value; else throw new Exception("运行中不可以更改颜色。"); } } private Font _RainFont = new Font(new FontFamily("Consolas"), 12); /**//// /// 获取、设置字符雨的字体样式 /// public Font RainFont { get { return _RainFont; } set { if (!Running) _RainFont = value; else throw new Exception("运行中不可以更改字体。"); } } private int _StreamsCount = 100; /**//// /// 获取、设置字符雨的数量 /// public int StreamsCount { get { return _StreamsCount; } set { if (!Running) _StreamsCount = value; else throw new Exception("运行中不可以更改数量。"); } } private int _MaxLength = 50; /**//// /// 获取、设置每个雨滴的最大字符数 /// public int MaxLength { get { return _MaxLength; } set { if (!Running) { if (value >= _MinLength) _MaxLength = value; else throw new Exception("最大字符数不能小于最小字符数。"); } else throw new Exception("运行中不可以更改数量。"); } } private int _MinLength = 20; /**//// /// 获取、设置每个雨滴的最小字符数 /// public int MinLength { get { return _MinLength; } set { if (!Running) { if (value <= _MaxLength) _MinLength = value; else throw new Exception("最小字符数不能大于最大字符数。"); } else throw new Exception("运行中不可以更改数量。"); } } public bool Running { get { return RainThread != null && RainThread.IsAlive; } } private Thread RainThread; private bool RUN; private bool PAUSE; private Brush BackBrush = null; private Brush RainHeadBrush = null; private Brush RainBodyBrush = null; private Brush RainTailBrush = null; /**//// /// 开始显示字符雨 /// public void Start() { if (_ShowWindow == null) throw new Exception("没有用于显示的窗口（或控件）"); if (!Running) { RainThread = new Thread(new ParameterizedThreadStart(RainProcess)); RUN = true; PAUSE = false; Ready(); RainThread.Start(); } } private void Ready() { Rain.RainFont = _RainFont; Rain.RainHeadColor = _RainHeadColor; Rain.RainBodyColor = _RainBodyColor; Rain.RainTailColor = _RainTailColor; Rain.BackColor = _ShowWindow.BackColor; if (RainHeadBrush != null) RainHeadBrush.Dispose(); if (RainBodyBrush != null) RainBodyBrush.Dispose(); if (RainTailBrush != null) RainTailBrush.Dispose(); if (BackBrush != null) BackBrush.Dispose(); RainHeadBrush = new SolidBrush(Rain.RainHeadColor); RainBodyBrush = new SolidBrush(Rain.RainBodyColor); RainTailBrush = new SolidBrush(Rain.RainTailColor); BackBrush = new SolidBrush(Rain.BackColor); //RainItems.Clear(); using (Graphics g = _ShowWindow.CreateGraphics()) { g.Clear(Rain.BackColor); } } private EventHandler DrawRainEvent; void CharacterRainPanel_DrawRainEvent(object sender, EventArgs e) { //foreach (Rain.Item item in e.Items) //{ // _ShowWindow.Invalidate(new Rectangle(item.X, item.Y, item.Width, item.Height)); // _ShowWindow.Update(); //} using (Graphics g = _ShowWindow.CreateGraphics()) { g.DrawImage(BMP, 0, 0); } //_ShowWindow.Invalidate(true); //_ShowWindow.Refresh(); } //private List private object RainLOCK = new object(); private void RainProcess(object Param) { using (BMP = new Bitmap(_ShowWindow.Width, _ShowWindow.Height)) { using (Graph = Graphics.FromImage(BMP)) { List<Rain> Rains = new List<Rain>(); for (int i = 0; i < _StreamsCount; i++) Rains.Add(new Rain(_MinLength + Rand.Next(_MaxLength - _MinLength))); while (RUN) { if (PAUSE) { Thread.Sleep(300); continue; } DoRain(Rains); Thread.Sleep(50); } foreach (Rain r in Rains) { r.Uninit(); } } } } private void DoRain(List<Rain> Rains) { for (int i = 0; i < Rains.Count; i++) { Rain rain = Rains[i]; if (!rain.Inited) { if (!rain.Init(_ShowWindow.Width, Rand.Next(_ShowWindow.Height / 3))) continue; } Rain.Item item = rain.GetItem(CHARACTERS[Rand.Next(CHARACTERS.Length)]); Rain.Item prior = null; if (item == null) continue; else { lock (BMPLock) { if (item.Y <= BMP.Height) { if (item.Type == Rain.Item.RainItemType.Head && rain.Prior.Type != Rain.Item.RainItemType.Tail) { rain.Prior.Type = Rain.Item.RainItemType.Body; prior = rain.Prior; } if (item.Type == Rain.Item.RainItemType.Back) { prior = rain.Prior; } switch (item.Type) { case Rain.Item.RainItemType.Head: { Graph.DrawString(new string(item.CH, 1), _RainFont, RainHeadBrush, item.X, item.Y); break; } case Rain.Item.RainItemType.Body: { Graph.DrawString(new string(item.CH, 1), _RainFont, RainBodyBrush, item.X, item.Y); break; } case Rain.Item.RainItemType.Tail: { Graph.DrawString(new string(item.CH, 1), _RainFont, RainTailBrush, item.X, item.Y); break; } case Rain.Item.RainItemType.Back: { Graph.FillRectangle(BackBrush, item.X, item.Y, item.Width, item.Height); break; } } if (prior != null) { switch (prior.Type) { case Rain.Item.RainItemType.Head: { Graph.DrawString(new string(prior.CH, 1), _RainFont, RainHeadBrush, prior.X, prior.Y); break; } case Rain.Item.RainItemType.Body: { Graph.DrawString(new string(prior.CH, 1), _RainFont, RainBodyBrush, prior.X, prior.Y); break; } case Rain.Item.RainItemType.Tail: { Graph.DrawString(new string(prior.CH, 1), _RainFont, RainTailBrush, prior.X, prior.Y); break; } case Rain.Item.RainItemType.Back: { Graph.FillRectangle(BackBrush, prior.X, prior.Y, prior.Width, prior.Height); break; } } } } else { item.Owner.Way = Rain.RainWay.Reverse; } } } } try { if (!_ShowWindow.Disposing) _ShowWindow.Invoke(DrawRainEvent, this, new EventArgs()); } catch { } } /**//// /// 停止显示字符雨 /// public void Stop() { RUN = false; } /**//// /// 暂停显示 /// public void Pause() { PAUSE = true; } /**//// /// 恢复暂停 /// public void Resume() { PAUSE = false; } //protected void Paint() //{ // lock (RainLOCK) // { // for (int i = RainItems.Count - 1; i >= 0; i--) // { // Rain.Item item = RainItems[i]; // if (item.X < BMP.Width) // { // if (item.Y < BMP.Height) // { // //if (e.ClipRectangle.X <= item.X && e.ClipRectangle.Y <= item.Y && e.ClipRectangle.Width >= item.Width && e.ClipRectangle.Height >= item.Height) // { // switch (item.Type) // { // case Rain.Item.RainItemType.Head: // { // e.Graphics.DrawString(new string(item.CH, 1), _RainFont, RainHeadBrush, item.X, item.Y); // break; // } // case Rain.Item.RainItemType.Body: // { // e.Graphics.DrawString(new string(item.CH, 1), _RainFont, RainBodyBrush, item.X, item.Y); // break; // } // case Rain.Item.RainItemType.Tail: // { // e.Graphics.DrawString(new string(item.CH, 1), _RainFont, RainTailBrush, item.X, item.Y); // break; // } // case Rain.Item.RainItemType.Back: // { // e.Graphics.FillRectangle(BackBrush, item.X, item.Y, item.Width, item.Height); // break; // } // } // } // } // else // { // item.Owner.Way = Rain.RainWay.Reverse; // } // } // if (item.Type == Rain.Item.RainItemType.Back) // { // RainItems.Remove(item); // } // } // } //} private class Rain { private static Font _RainFont; public static Font RainFont { get { return _RainFont; } set { _RainFont = value; _RainHeight = (int)(value.Size * value.FontFamily.GetLineSpacing(FontStyle.Regular) / value.FontFamily.GetEmHeight(FontStyle.Regular)) + 1; } } public static Color BackColor; public static Color RainBodyColor; public static Color RainHeadColor; public static Color RainTailColor; private static int _RainHeight; public static int RainHeight { get { return _RainHeight; } } private static object RangeLock = new object(); private static List<Rectangle> Ranges = new List<Rectangle>(); Queue<Item> Chars = new Queue<Item>(); private int _Length; private int _BeginX; private int _BeginY; private RainWay _Way; public RainWay Way { get { return _Way; } set { _Way = value; } } private Rectangle Range; public enum RainWay : byte { /**//// /// 正向 /// Obverse = 0, /**//// /// 反向 /// Reverse = 1 } public bool Inited { get { return Chars.Count > 0; } } public bool Init(int Width, int Y) { bool Ret = true; Uninit(); if (Rand.Next(30) < 10) return false; _BeginX = Rand.Next(Width); Size s = TextRenderer.MeasureText(" ", _RainFont); Range = new Rectangle(_BeginX, Y, s.Width, s.Height * _Length); foreach (Rectangle r in Ranges) { if (r.Contains(this.Range) || r.IntersectsWith(this.Range)) { Ret = false; break; } } if (Ret) Ranges.Add(this.Range); _BeginY = Y; _Way = RainWay.Obverse; _Prior = null; return Ret; } public void Uninit() { if (this.Range != null && Ranges.Contains(this.Range)) Ranges.Remove(this.Range); } item#region item public class Item { private Rain _Owner; public Rain Owner { get { return _Owner; } } public enum RainItemType : byte { Head = 0, Body = 1, Tail = 2, Back = 3 } private char _CH; public char CH { get { return _CH; } } private int _X; public int X { get { return _X; } } private int _Y; public int Y { get { return _Y; } } private int _Width; public int Width { get { return _Width; } } private int _Height; public int Height { get { return _Height; } } private RainItemType _Type; public RainItemType Type { get { return _Type; } set { _Type = value; } } public Item(Rain Owner, char CH, int X, int Y, RainItemType Type) { this._Owner = Owner; this._CH = CH; this._X = X; this._Y = Y; Size s = TextRenderer.MeasureText(new string(CH, 1), RainFont); this._Width = s.Width; this._Height = s.Height; this._Type = Type; } } #endregion public Rain(int Length) { _Length = Length; } public Item GetItem(char CH) { Item Ret = null; if (_Way == RainWay.Obverse) { Ret = Add(CH); if (Ret == null) _Way = RainWay.Reverse; } else { Ret = Remove(); if (Ret == null) _Way = RainWay.Obverse; } return Ret; } private Item _Prior = null; public Item Prior { get { return _Prior; } } private Item Add(char CH) { Item Ret = null; if (Chars.Count < _Length) { Ret = new Item(this, CH, _BeginX, _BeginY + RainHeight * Chars.Count, Chars.Count == 0 ? Item.RainItemType.Tail : Item.RainItemType.Head); if (Ret.Type == Item.RainItemType.Head) _Prior = Chars.Last(); Chars.Enqueue(Ret); } return Ret; } private Item Remove() { Item Ret = null; if (Chars.Count > 0) { Ret = Chars.Dequeue(); Ret.Type = Item.RainItemType.Back; if (Chars.Count > 0) { _Prior = Chars.First(); _Prior.Type = Item.RainItemType.Tail; } else _Prior = null; } return Ret; } }
}
测试程序下载
使用的时候，先设定ShowWindow，这个属性决定在哪个控件上显示字符雨，然后还可以设置如下属性：
MaxLength：每条字符雨的最大字符数量
MinLength：每条字符雨的最小字符数量
RainBodyColor：字符雨中间的颜色
RainCharacters：字符雨可以使用到的字符
FainFont：字体
RainHeadColor：最前面的字符的颜色
RainTailColor：最后面字符的颜色
StreamsCount：字符雨的数量
还有如下方法可供调用：
Start：开始显示
Stop：停止显示
Pause：暂停显示
Resume：恢复暂停