VB.Net Tutorial/2D Graphics/RotateTransform

RotateTransform and draw Ellipse

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class RotateTransformEllipse
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Private Sub Panel1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Panel1.Paint
        Dim canvas As Graphics = e.Graphics
        Dim counter As Integer
        Const numberOfLobes As Integer = 20
        Dim atomPen As Pen = New Pen(Color.Blue, 2)
        Dim sizeFactor As Integer = Button2.ClientSize.Width \ 2
        Dim lobeLength As Integer = sizeFactor * 8 \ 10
        Dim lobeWidth As Integer = lobeLength \ 4
        canvas.TranslateTransform(sizeFactor, sizeFactor)
        For counter = 1 To numberOfLobes
            canvas.RotateTransform(360 / numberOfLobes)
            canvas.DrawEllipse(atomPen, -lobeLength, -lobeWidth, lobeLength * 2, lobeWidth * 2)
        Next counter
    End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Class Form1
    Inherits System.Windows.Forms.Form
    "Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub
    "Required by the Windows Form Designer
    Private components As System.ruponentModel.IContainer
    "NOTE: The following procedure is required by the Windows Form Designer
    "It can be modified using the Windows Form Designer.  
    "Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.Panel1 = New System.Windows.Forms.Panel
        Me.Button2 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        "
        "Panel1
        "
        Me.Panel1.Location = New System.Drawing.Point(56, 32)
        Me.Panel1.Name = "Panel1"
        Me.Panel1.Size = New System.Drawing.Size(368, 400)
        Me.Panel1.TabIndex = 0
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(479, 284)
        Me.Controls.Add(Me.Panel1)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
        Me.MaximizeBox = False
        Me.Text = "Special Effects"
        Me.ResumeLayout(False)
    End Sub
    Friend WithEvents Panel1 As System.Windows.Forms.Panel
    Friend WithEvents Button2 As System.Windows.Forms.Button
End Class

RotateTransform With MatrixOrder.Prepend

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class RotateTransformWithMatrixOrderPrepend
   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)
      e.Graphics.ScaleTransform(90, 90, MatrixOrder.Append)
      e.Graphics.TranslateTransform( _
          Me.ClientRectangle.Width \ 2, _
          Me.ClientRectangle.Height \ 2, _
          MatrixOrder.Append)
      For i As Integer = 5 To 90 Step 5
          e.Graphics.RotateTransform(5, MatrixOrder.Prepend)
          e.Graphics.DrawRectangle(New Pen(Color.Black, 0), -1, -1, 2, 2)
      Next i
  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

Scale first, then Transform, then Rotate

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class ScaleFirstThenTransformThenRotate
   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)
        e.Graphics.ScaleTransform(30, 30, MatrixOrder.Append)
        e.Graphics.TranslateTransform(150, 60, MatrixOrder.Append)
        e.Graphics.RotateTransform(30, MatrixOrder.Append)
        DrawArrow(e.Graphics, HatchStyle.Cross)
    End Sub
    Private Sub DrawArrow(ByVal gr As Graphics, ByVal hatch_style As HatchStyle)
        Dim pts() As Point = { _
            New Point(0, 1), _
            New Point(2, 1), _
            New Point(2, 0), _
            New Point(4, 2), _
            New Point(2, 4), _
            New Point(2, 3), _
            New Point(0, 3) _
        }
        gr.FillPolygon(New HatchBrush(hatch_style, Color.Black, Color.White), pts)
        gr.DrawPolygon(New Pen(Color.Black, 0), pts)
    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