摘要：
功能：使用System重新绘制winform的GroupBox以调整边框颜色和边框宽度；使用System.Collections。通用的使用系统。组件模型；使用系统。绘画使用系统。数据使用系统。Linq；使用系统。文本使用System.Windows.For
功能：重绘winform的GroupBox，以便调整边框颜色和边框宽度
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
namespace JSHYSC_CtrlLib
{
public partial class Ctrl_GroupBox : GroupBox
{
private Color borderLineColor =System.Drawing.SystemColors.GradientActiveCaption;
/// <summary>
/// 边框线颜色
/// </summary>
public Color BorderLineColor
{
get { return borderLineColor; }
set { borderLineColor = value; }
}
private float borderLineWidth = 1;
/// <summary>
/// 边框线宽度
/// </summary>
public float BorderLineWidth
{
get { return borderLineWidth; }
set { borderLineWidth = value; }
}
public Ctrl_GroupBox()
{
InitializeComponent();
}
protected override void OnPaint(PaintEventArgs e)
{
//base.OnPaint(e);
e.Graphics.Clear(base.BackColor);
//圆弧直径长度
int radius = 20;
int width = e.ClipRectangle.Width, height = e.ClipRectangle.Height;
int titleStartX = 15;
float titleWidth = e.Graphics.MeasureString(base.Text, base.Font).Width;
float titleHeight = e.Graphics.MeasureString(base.Text, base.Font).Height;
Pen pen = new Pen(borderLineColor, (float)borderLineWidth);
//左上角圆弧
e.Graphics.DrawArc(pen, new Rectangle(0, (int)(titleHeight / 2), radius, radius), 180, 90);
//上边框，标题前半部分
e.Graphics.DrawLine(pen, radius / 2, (titleHeight - 1) / 2, radius + titleStartX-3, (titleHeight - 1) / 2);
//画笔
SolidBrush brush = new SolidBrush(Color.Black);
Font font = new System.Drawing.Font("宋体", 10, FontStyle.Bold);
//标题
e.Graphics.DrawString(base.Text, font, brush, radius / 2 + titleStartX, 0);
//上边框，标题右半部分
e.Graphics.DrawLine(pen, radius / 2 + titleStartX + titleWidth+3, (titleHeight - 1) / 2, (width - 1) - radius / 2, (titleHeight - 1) / 2);
//右上角圆弧
e.Graphics.DrawArc(pen, new Rectangle((width - 1) - radius, (int)(titleHeight / 2), radius, radius), 270, 90);
//右边框
e.Graphics.DrawLine(pen, width - 1, (int)(titleHeight / 2) + radius / 2, width - 1, (height - 1) - radius / 2);
//右下角圆弧
e.Graphics.DrawArc(pen, new Rectangle((width - 1) - radius, (height - 1) - radius, radius, radius), 0, 90);
//下边框
e.Graphics.DrawLine(pen, (width - 1) - radius / 2, height - 1, radius / 2, height - 1);
//左下角圆弧
e.Graphics.DrawArc(pen, new Rectangle(0, (height - 1) - radius, radius, radius), 90, 90);
//左边框
e.Graphics.DrawLine(pen, 0, (height - 1) - radius / 2, 0, (int)(titleHeight / 2) + radius / 2);
}
}
}