如何創建一個圓角面板和剪輯的約束

Question

我想周圍畫panel.But邊框我有如下問題：
邊界不夾。
我的代碼：

protected override void OnPaint(PaintEventArgs e) 
{ 
     base.OnPaint(e); 
     int diameter = radius * 2; 
     Size size = new Size(diameter, diameter); 
     int w = size.Width-1; 
     int h = size.Height-1; 
     Rectangle arc = new Rectangle(bounds.Location.X, bounds.Location.Y, w, h); 
     GraphicsPath path = new GraphicsPath(); 
     path.AddArc(arc, 180, 90); 
     arc.X = bounds.Right - diameter; 
     path.AddArc(arc, 270, 90); 
     arc.Y = bounds.Bottom- diameter; 
     path.AddArc(arc, 0, 90); 
     arc.X = bounds.Left; 
     path.AddArc(arc, 90, 90); 
     path.CloseFigure(); 
     GraphicsPath GraphPath = path; 
     this.Region = new Region(GraphPath); 
     using (Pen pen = new Pen(Color.Blue, 1)) { 
     e.Graphics.DrawPath(pen, path); 
     } 
} 

Answer 1

可以使面板的背景色透明，然後自己繪製背景是這樣的：

e.Graphics.FillPath(Brushes.LightBlue, path); 

您繪製邊框右側前。
然而，WinForms的透明度並不十分完美，角落只需要父控件的BackColor，所以如果你打算在它下面畫任何東西，它們仍然會覆蓋它。