Graphics.ReleaseHdc : Graphics « 2D Graphics « VB.Net Tutorial

1. VB.Net Tutorial
2. 2D Graphics
3. Graphics

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms

public class ReleaseHdc
   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 hdc As IntPtr = e.Graphics.GetHdc()
        Dim newGraphics As Graphics = Graphics.FromHdc(hdc)
        newGraphics.DrawRectangle(New Pen(Color.Red, 3), 0, 0, 200, 100)
        e.Graphics.ReleaseHdc(hdc)
  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

17.40.Graphics
	17.40.1.	Create Graphics from Handle
	17.40.2.	Create Graphics object from System.Windows.Forms.PaintEventArgs
	17.40.3.	Graphics.DpiX
	17.40.4.	Graphics: clear background
	17.40.5.	Graphics.DrawArc
	17.40.6.	Graphics.DrawBeziers
	17.40.7.	Graphics.DrawClosedCurve
	17.40.8.	Graphics.DrawCurve
	17.40.9.	Graphics.DrawEllipse Method
	17.40.10.	Use Graphics.DrawEllipse to draw a circle
	17.40.11.	Graphics.DrawIcon
	17.40.12.	Graphics.DrawIconUnstretched
	17.40.13.	Graphics.DrawImage
	17.40.14.	Graphics.DrawLines
	17.40.15.	Graphics.DrawPath
	17.40.16.	Graphics.DrawPie
	17.40.17.	Graphics.DrawPolygon
	17.40.18.	Graphics.DrawString
	17.40.19.	Graphics.ExcludeClip
	17.40.20.	Graphics.FillClosedCurve
	17.40.21.	Graphics.FillEllipse
	17.40.22.	Graphics.FillPath
	17.40.23.	Graphics.FillPie 2
	17.40.24.	Graphics.FillPolygon
	17.40.25.	Graphics.FillRectangle
	17.40.26.	Graphics.FillRectangles
	17.40.27.	Graphics.IntersectClip
	17.40.28.	Graphics.MeasureString
	17.40.29.	Graphics.ReleaseHdc
	17.40.30.	Graphics.ResetClip
	17.40.31.	Graphics.SetClip