[转]C# winForm 创建水晶风格的按钮

时下水晶风格比较流行，在天极网看到一篇制作水晶按钮控件的文章，
首先启动Visual Studio 2005，新建空白解决方案，我们取名为：TestCrystalButton，
然后在项目导航栏上右击鼠标添加新项目，为此解决方案添加新的C# Windows 控件库，取名为MyControls。
IDE会创建一个继承于UserControl名为UserControl1的类，修改代码使其继承自Button，
并将原文件中所有引用UserControl1名称的地方都更改为CrystalButton，在项目导航栏中把UserControl1.cs更名为CrystalButton.cs
然后将InitializeComponent()方法中的

this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

语句注释掉，因为从Button控件不可能有自动缩放功能，它必须依赖于其父控件。
在源文件头部添加对System.Drawing.Imaging和System.Drawing.Drawing2D程序集的引用。
首先需要创建一个枚举类型MouseActionType，当按钮需要绘制时会根据当前鼠标的位置进行不同状态的绘制，
代码如下：

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Drawing;

using System.Data;

using System.Text;

using System.Windows.Forms;

using System.Drawing.Imaging;

using System.Drawing.Drawing2D;

namespace TestCrystalButton

{

public partial class CrystalButton : Button

{

public CrystalButton()

{

InitializeComponent();

}

private enum MouseActionType

{

None,

Hover,

Click

}

private MouseActionType mouseAction;

private GraphicsPath GetGraphicsPath(Rectangle rc, int r)

{

int x = rc.X, y = rc.Y, w = rc.Width, h = rc.Height;

GraphicsPath path = new GraphicsPath();

path.AddArc(x, y, r, r, 180, 90);

//Upper left corner

path.AddArc(x + w - r, y, r, r, 270, 90);

//Upper right cornr

path.AddArc(x + w - r, y + h - r, r, r, 0, 90);

//Lower right corner

path.AddArc(x, y + h - r, r, r, 90, 90);

//Lower left corner

path.CloseFigure();

return path;

}

protected override void OnPaint(PaintEventArgs e)

{

Graphics g = e.Graphics;

g.Clear(SystemColors.ButtonFace);

Color clr = Color.Wheat;//BtnColor;

int shadowOffset = 8;

int btnOffset = 0;

switch(mouseAction)

{

case MouseActionType.Click :

shadowOffset = 4;

clr = Color.LightGray;

btnOffset = 2;

break;

case MouseActionType.Hover:

clr = Color.LightGray;

break;

}

g.SmoothingMode = SmoothingMode.AntiAlias;

// 创建按钮本身的图形

Rectangle rc = new Rectangle(btnOffset, btnOffset, this.ClientSize.Width - 8 - btnOffset, this.ClientSize.Height - 8 - btnOffset);

GraphicsPath path1 = this.GetGraphicsPath(rc, 20);

LinearGradientBrush br1 = new LinearGradientBrush(new Point(0, 0), new Point(0, rc.Height + 6), clr, Color.White);

// 创建按钮阴影

Rectangle rc2 = rc;

rc2.Offset(shadowOffset, shadowOffset);

GraphicsPath path2 = this.GetGraphicsPath(rc2, 20);

PathGradientBrush br2 = new PathGradientBrush(path2);

br2.CenterColor = Color.Black;

br2.SurroundColors = new Color[] { SystemColors.ButtonFace };

//为了更逼真，我们将渐变结束颜色设定为窗体前景颜色，可以根据窗口的前景颜色适当调整

//创建按钮顶部白色渐变

Rectangle rc3 = rc;

rc3.Inflate(-5, -5);

rc3.Height = 15;

GraphicsPath path3 = GetGraphicsPath(rc3, 20);

LinearGradientBrush br3 = new LinearGradientBrush(rc3, Color.FromArgb(255, Color.White), Color.FromArgb(0, Color.White), LinearGradientMode.Vertical);

// 绘制图形

g.FillPath(br2, path2); //绘制阴影

g.FillPath(br1, path1); //绘制按钮

g.FillPath(br3, path3); //绘制顶部白色泡泡

//设定内存位图对象，进行二级缓存绘图操作

Rectangle buttonBitmapRectangle = new Rectangle(rc.Location, rc.Size);

Bitmap buttonBitmap = new Bitmap(buttonBitmapRectangle.Width, buttonBitmapRectangle.Height);

Graphics g_bmp = Graphics.FromImage(buttonBitmap);

g_bmp.SmoothingMode = SmoothingMode.AntiAlias;

g_bmp.FillPath(br1, path1);

g_bmp.FillPath(br3, path3);

//将region赋值给button

Region rgn = new Region(path1);

rgn.Union(path2);

this.Region = rgn;

// 绘制按钮的文本

GraphicsPath path4 = new GraphicsPath();

RectangleF path1bounds = path1.GetBounds();

Rectangle rcText = new Rectangle((int)path1bounds.X + btnOffset, (int)path1bounds.Y + btnOffset, (int)path1bounds.Width, (int)path1bounds.Height);

StringFormat strformat = new StringFormat();

strformat.Alignment = StringAlignment.Center;

strformat.LineAlignment = StringAlignment.Center;

path4.AddString(this.Text, this.Font.FontFamily, (int)this.Font.Style, this.Font.Size, rcText, strformat);

Pen txtPen = new Pen(this.ForeColor, 1);

g.DrawPath(txtPen, path4);

g_bmp.DrawPath(txtPen, path4);

}

}

}

在Windows Application中添加对此dll的引用即可制作出漂亮的水晶控件啦！