Private Sub RoundingAndTruncatingRectangles( _
    ByVal e As PaintEventArgs)

    ' Construct a new RectangleF.
    Dim myRectangleF As New RectangleF(30.6F, 30.7F, 40.8F, 100.9F)

    ' Call the Round method.
    Dim roundedRectangle As Rectangle = Rectangle.Round(myRectangleF)

    ' Draw the rounded rectangle in red.
    Dim redPen As New Pen(Color.Red, 4)
    e.Graphics.DrawRectangle(redPen, roundedRectangle)

    ' Call the Truncate method.
    Dim truncatedRectangle As Rectangle = _
        Rectangle.Truncate(myRectangleF)

    ' Draw the truncated rectangle in white.
    Dim whitePen As New Pen(Color.White, 4)
    e.Graphics.DrawRectangle(whitePen, truncatedRectangle)

    ' Dispose of the custom pens.
    redPen.Dispose()
    whitePen.Dispose()
End Sub

' 导入命名空间
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms

public class RectangleUnionIntersect
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

public class Form1
  Inherits System.Windows.Forms.Form

  Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
        Dim g As Graphics = Me.CreateGraphics()

        Dim pt As New PointF(30.8F, 20.7F)
        Dim sz As New SizeF(60.0F, 40.0F)

        Dim rect1 As New RectangleF(pt, sz)
        Dim rect2 As New RectangleF(40.2F, 40.6F, 100.5F, 100.0F)

        Dim rect3 As Rectangle = Rectangle.Ceiling(rect1)

        Dim rect4 As Rectangle = Rectangle.Truncate(rect1)

        Dim rect5 As Rectangle = Rectangle.Round(rect2)

        g.DrawRectangle(Pens.Black, rect3)
        g.DrawRectangle(Pens.Red, rect5)

        Dim isectRect As Rectangle = Rectangle.Intersect(rect3, rect5)

        g.FillRectangle(New SolidBrush(Color.Blue), isectRect)

        Dim inflateSize As New Size(0, 40)
        isectRect.Inflate(inflateSize)

        g.DrawRectangle(Pens.Blue, isectRect)

        rect4 = Rectangle.Empty
        rect4.Location = New Point(50, 50)
        rect4.X = 30
        rect4.Y = 40

        Dim unionRect As Rectangle = Rectangle.Union(rect4, rect5)

        g.DrawRectangle(Pens.Green, unionRect)

        g.Dispose()

  End Sub

  Public Sub New()
   
    MyBase.New()
    Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
    Me.ClientSize = New System.Drawing.Size(292, 273)
    Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen

  End Sub

End Class