Mega Code Archive
Region MakeEmpty, Region MakeInfinite, Region GetBounds
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class RegionMakeEmptyMakeInfinite
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()
g.Clear(Me.BackColor)
Dim rect1 As New Rectangle(20, 20, 60, 80)
Dim rect2 As New Rectangle(50, 30, 60, 80)
Dim rgn1 As New [Region](rect1)
Dim rgn2 As New [Region](rect2)
If Not rgn1.IsEmpty(g) Then
rgn1.MakeEmpty()
End If
If Not rgn2.IsInfinite(g) Then
rgn2.MakeInfinite()
End If ' Get bounds of the infinite region
Dim rect As RectangleF = rgn2.GetBounds(g)
Console.WriteLine(rect.ToString())
g.FillRegion(Brushes.Red, rgn2)
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