c# winForm 圆角Panel
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using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
namespace RoundPanel
{
class RoundPanel : Panel
{
private int mMatrixRound = 8;
private Color mBack;
public Color Back
{
get { return mBack; }
set
{
if (value == null)
{
mBack = Control.DefaultBackColor;
}
else
{
mBack = value;
}
base.Refresh();
}
}
public int MatrixRound
{
get { return mMatrixRound; }
set
{
mMatrixRound = value;
base.Refresh();
}
}
private GraphicsPath CreateRound(Rectangle rect, int radius)
{
GraphicsPath roundRect = new GraphicsPath();
//顶端
roundRect.AddLine(rect.Left + radius - 1, rect.Top - 1, rect.Right - radius, rect.Top - 1);
//右上角
roundRect.AddArc(rect.Right - radius, rect.Top - 1, radius, radius, 270, 90);
//右边
roundRect.AddLine(rect.Right, rect.Top + radius, rect.Right, rect.Bottom - radius);
//右下角
roundRect.AddArc(rect.Right - radius, rect.Bottom - radius, radius, radius, 0, 90);
//底边
roundRect.AddLine(rect.Right - radius, rect.Bottom, rect.Left + radius, rect.Bottom);
//左下角
roundRect.AddArc(rect.Left - 1, rect.Bottom - radius, radius, radius, 90, 90);
//左边
roundRect.AddLine(rect.Left - 1, rect.Top + radius, rect.Left - 1, rect.Bottom - radius);
//左上角
roundRect.AddArc(rect.Left - 1, rect.Top - 1, radius, radius, 180, 90);
return roundRect;
}
protected override void OnPaint(PaintEventArgs e)
{
int width = base.Width - base.Margin.Left - base.Margin.Right;
int height = base.Height - base.Margin.Top - base.Margin.Bottom;
Rectangle rec = new Rectangle(base.Margin.Left, base.Margin.Top, width, height);
GraphicsPath round = CreateRound(rec, mMatrixRound);
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
e.Graphics.FillPath((Brush)(new SolidBrush(mBack)), round);
}
protected override void OnResize(EventArgs eventargs)
{
base.Refresh();
}
}
}
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