"Original" Redraw WinForm's GroupBox

Function: Redraw the GroupBox of the WinForm to adjust the border color and border width

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.system        Colors.gradientactivecaption; <summary>///Border Line Color///</summary> public color Borderlinecolor {g            ET {return borderlinecolor;}        set {Borderlinecolor = value;}        } private float borderlinewidth = 1; <summary>///Border line width///</summary> public float Borderlinewidth {g            ET {return borderlinewidth;}        set {borderlinewidth = value;}        } public Ctrl_groupbox () {InitializeComponent ();         } protected override void OnPaint (PaintEventArgs e) {   Base.            OnPaint (e); E.graphics.clear (base.            BackColor);            Arc diameter length 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);            Upper left corner arc E.graphics.drawarc (pen, new Rectangle (0, (int) (TITLEHEIGHT/2), radius, radius), 180, 90); Top border, title front half e.graphics.drawline (pen, RADIUS/2, (titleHeight-1)/2, Radius + titleStartX-3, (titleheight            -1)/2);            Brushes SolidBrush Brush = new SolidBrush (color.black);            Font font = new System.Drawing.Font ("Arial", ten, FontStyle.Bold); Title E.graphics.drawstring (base.            Text, font, brush, RADIUS/2 + titlestartx, 0); Topbox, title right half E.graphics.drawline (pen, RADIUS/2 + Titlestartx + titlewidth+3, (titleHeight-1)/2, (width-1)-            RADIUS/2, (titleHeight-1)/2); upper right corner arc E.graphics.drawarc (pen, New Rectangle ((width-1)-radius, (int) (TITLEHEIGHT/2), radius, radius), 27            0, 90);  Right border E.graphics.drawline (pen, width-1, (int) (TITLEHEIGHT/2) + RADIUS/2, width-1, (height-1)-radius            /2); Lower right corner arc E.graphics.drawarc (pen, New Rectangle ((width-1)-radius, (height-1)-radius, radius, radius), 0,            90);            Bottom Border E.graphics.drawline (pen, (width-1)-RADIUS/2, Height-1, RADIUS/2, height-1);            Lower left corner arc E.graphics.drawarc (pen, new Rectangle (0, (height-1)-radius, radius, radius), 90, 90);        Left Border E.graphics.drawline (pen, 0, (height-1)-RADIUS/2, 0, (int) (TITLEHEIGHT/2) + RADIUS/2); }    }}

　　

"Original" Redraw WinForm's GroupBox