@H_301_0@Public Class Form1
'*********************************************************************
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'绘制圆角矩形函数
Private Function GetRoundedRectPath(ByVal rect As Rectangle,ByVal radius As Integer) As System.Drawing.Drawing2D.GraphicsPath
rect.Offset(-1,-1)
Dim RoundRect As New Rectangle(rect.Location,New Size(radius - 1,radius - 1))
Dim path As New System.Drawing.Drawing2D.GraphicsPath
path.AddArc(RoundRect,180,90) '左上角
RoundRect.X = rect.Right - radius '右上角
path.AddArc(RoundRect,270,90)
RoundRect.Y = rect.Bottom - radius '右下角
path.AddArc(RoundRect,90)
RoundRect.X = rect.Left '左下角
path.AddArc(RoundRect,90,90)
path.CloseFigure()
Return path
End Function
'绘制矩形
Private Sub DrawingRect()
Dim g As Graphics = Me.CreateGraphics '定义一个画布
Dim Pen As New Pen(Brushes.DarkRed,2) '定义一个画笔
Dim Hei As Integer = Me.Height
Dim Wid As Integer = Me.Width
'矩形的位置和长宽随着窗体的变化而改变
Dim Rec As New Rectangle(Int(Wid / 5),Int(Hei / 5),Int(Wid / 2),Int(Hei / 2))
' g.DrawRectangle(Pen,Rec)
'清楚现有的矩形
g.Clear(Me.BackColor)
g.DrawPath(Pen,GetRoundedRectPath(Rec,30))
End Sub
Private Sub Form1_Paint(ByVal sender As System.Object,ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
DrawingRect()
End Sub
Private Sub Form1_SizeChanged(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles MyBase.SizeChanged
Me.Invalidate() '此函数可引发Paint事件
End Sub
End Class
原窗体绘制：
缩小窗体时：
