Private Sub StaticRectangleIntersection(ByVal e As PaintEventArgs)
    Dim rectangle1 As New Rectangle(50, 50, 200, 100)
    Dim rectangle2 As New Rectangle(70, 20, 100, 200)
    Dim rectangle3 As New Rectangle

    e.Graphics.DrawRectangle(Pens.Black, rectangle1)
    e.Graphics.DrawRectangle(Pens.Red, rectangle2)

    If (rectangle1.IntersectsWith(rectangle2)) Then
        rectangle3 = Rectangle.Intersect(rectangle1, rectangle2)
        If Not rectangle3.IsEmpty Then
            e.Graphics.FillRectangle(Brushes.Green, rectangle3)
        End If
    End If
End Sub

Private Sub InstanceRectangleIntersection( _
      ByVal e As PaintEventArgs)

      Dim rectangle1 As New Rectangle(50, 50, 200, 100)
      Dim rectangle2 As New Rectangle(70, 20, 100, 200)

      e.Graphics.DrawRectangle(Pens.Black, rectangle1)
      e.Graphics.DrawRectangle(Pens.Red, rectangle2)

      If (rectangle1.IntersectsWith(rectangle2)) Then
          rectangle1.Intersect(rectangle2)
          If Not (rectangle1.IsEmpty) Then
              e.Graphics.FillRectangle(Brushes.Green, rectangle1)
          End If
      End If
  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