VB.Net/2D/Transform

Combine TranslateTransform and ScaleTransform

<source lang="vbnet"> Imports System Imports System.Windows.Forms Imports System.Drawing.Text Imports System.Drawing Imports System.Drawing.Drawing2D Public Class MainClass

   Shared Sub Main(ByVal args As String())
       Dim myform As Form = New Form1()
       Application.Run(myform)
   End Sub

End Class

Public Class Form1

   Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
       " Draw the original diamond.
       DrawDiamond(e.Graphics)
       " Translate 
       e.Graphics.TranslateTransform(-50, -50, MatrixOrder.Append)
       " Scale by a factor of 2.
       e.Graphics.ScaleTransform(2, 2, MatrixOrder.Append)
       " Translate the center back 
       e.Graphics.TranslateTransform(50, 50, MatrixOrder.Append)
       " Draw the diamond.
       DrawDiamond(e.Graphics)
   End Sub
   Private Sub DrawDiamond(ByVal gr As Graphics)
       Dim pts() As Point = { _
           New Point(75, 125), _
           New Point(125, 75), _
           New Point(175, 125), _
           New Point(125, 175) _
       }
       gr.DrawPolygon(Pens.Black, pts)
   End Sub

End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _ Partial Public Class Form1

   Inherits System.Windows.Forms.Form
   "Form overrides dispose to clean up the component list.
   <System.Diagnostics.DebuggerNonUserCode()> _
   Protected Overloads 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.SuspendLayout()
       "
       "Form1
       "
       Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
       Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
       Me.ClientSize = New System.Drawing.Size(500, 500)
       Me.Name = "Form1"
       Me.Text = "Title"
       Me.ResumeLayout(False)
   End Sub

End Class

      </source>

Path Transform Matrix Demo

<source lang="vbnet"> Imports System Imports System.ruponentModel Imports System.Windows.Forms Imports System.Data Imports System.Configuration Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Drawing.Text Imports System.Globalization Imports System.Text Imports System.Collections Public Class MainClass

   Shared Sub Main()
       
       Dim myform As Form = New PathTranslationForm()
       Application.Run(myform)
   End Sub

End Class

Public Class PathTranslationForm

   Inherits System.Windows.Forms.Form

1. Region " Windows Form Designer generated code "

   Public Sub New()
       MyBase.New()
       "This call is required by the Windows Form Designer.
       InitializeComponent()
       "Add any initialization after the InitializeComponent() call
   End Sub
   "Form overrides dispose to clean up the component list.
   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
       If disposing Then
           If Not (components Is Nothing) Then
               components.Dispose()
           End If
       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()
       components = New System.ruponentModel.Container()
       Me.Text = "PathTranslationForm"
   End Sub

1. End Region

   Sub PathTranslationForm_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) Handles MyBase.Paint
       Dim g As Graphics = e.Graphics
       Dim path As GraphicsPath = New GraphicsPath()
       Dim rect As RectangleF = New RectangleF(0, 0, 50, 50)
       Dim format As StringFormat = New StringFormat()
       format.Alignment = StringAlignment.Center
       format.LineAlignment = StringAlignment.Center
       path.AddRectangle(rect)
       path.AddString("P", Me.Font.FontFamily, CInt(Me.Font.Style), Me.Font.Height+30, rect, format)
       
       g.DrawPath(Pens.Black, path)
       Dim matrix As Matrix = New Matrix()
       matrix.Translate(50, 50)
       path.Transform(matrix)
       g.DrawPath(Pens.Black, path)
   End Sub

End Class

      </source>

Transform Demo

<source lang="vbnet"> Imports System Imports System.ruponentModel Imports System.Windows.Forms Imports System.Data Imports System.Configuration Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Drawing.Text Imports System.Globalization Imports System.Text Imports System.Collections Public Class MainClass

   Shared Sub Main()
       
       Dim myform As Form = New TranslationForm()
       Application.Run(myform)
   End Sub

End Class

Public Class TranslationForm

   Inherits System.Windows.Forms.Form

1. Region " Windows Form Designer generated code "

   Public Sub New()
       MyBase.New()
       "This call is required by the Windows Form Designer.
       InitializeComponent()
       "Add any initialization after the InitializeComponent() call
   End Sub
   "Form overrides dispose to clean up the component list.
   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
       If disposing Then
           If Not (components Is Nothing) Then
               components.Dispose()
           End If
       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()
       components = New System.ruponentModel.Container()
       Me.Text = "TranslationForm"
   End Sub

1. End Region

   Sub DrawLabeledRect(ByVal g As Graphics, ByVal label As String)
   End Sub
   Sub TranlationForm_Pain(ByVal sender As Object, ByVal e As PaintEventArgs) Handles MyBase.Paint
       Dim g As Graphics = e.Graphics
       Dim rect As RectangleF = New RectangleF(0, 0, 125, 125)
       Dim format As StringFormat = New StringFormat()
       format.Alignment = StringAlignment.Center
       format.LineAlignment = StringAlignment.Center
       g.FillRectangle(Brushes.White, rect)
       g.DrawRectangle(Pens.Black, rect.X, rect.Y, rect.Width, rect.Height)
       g.DrawString("Translate(0,0)", Me.Font, Brushes.Black, rect, format)

       Dim matrix As Matrix = New Matrix()
       matrix.Translate(150, 150)
       g.Transform = matrix
       DrawLabeledRect(g, "Translate(150, 150)")
   End Sub

End Class

      </source>

TranslateTransform Demo

<source lang="vbnet"> Imports System Imports System.Windows.Forms Imports System.Drawing.Text Imports System.Drawing Imports System.Drawing.Drawing2D Public Class MainClass

   Shared Sub Main(ByVal args As String())
       Dim myform As Form = New Form1()
       Application.Run(myform)
   End Sub

End Class

Public Class Form1

   Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
       Dim device_rect As New Rectangle(50, 50, 150, 150)
       e.Graphics.DrawRectangle(Pens.Black, device_rect)
       Dim world_rect As New Rectangle(0, 0, 1, 1)
       MapRectangles(e.Graphics, world_rect, device_rect)
       DrawSmiley(e.Graphics)
   End Sub
   Private Sub DrawSmiley(ByVal gr As Graphics)
       Dim the_pen As New Pen(Color.Black, 0)
       gr.FillEllipse(Brushes.Yellow, 0, 0, 1, 1)              " Face.
       gr.DrawEllipse(the_pen, 0, 0, 10, 10)
   End Sub
   " Map a world coordinate rectangle to a device coordinate rectangle.
   Private Sub MapRectangles(ByVal gr As Graphics, ByVal world_rect As Rectangle, ByVal device_rect As Rectangle)
       gr.ResetTransform()
       gr.TranslateTransform( _
           CSng(-(world_rect.X + world_rect.Width / 2)), _
           CSng(-(world_rect.Y + world_rect.Height / 2)), _
           MatrixOrder.Append)
   End Sub

End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _ Partial Public Class Form1

   Inherits System.Windows.Forms.Form
   "Form overrides dispose to clean up the component list.
   <System.Diagnostics.DebuggerNonUserCode()> _
   Protected Overloads 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.SuspendLayout()
       "
       "Form1
       "
       Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
       Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
       Me.ClientSize = New System.Drawing.Size(564, 209)
       Me.Name = "Form1"
       Me.Text = "Title"
       Me.ResumeLayout(False)
   End Sub

End Class

      </source>

TranslateTransform: Draw Ellipse Path

<source lang="vbnet"> Imports System Imports System.ruponentModel Imports System.Windows.Forms Imports System.Data Imports System.Configuration Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Drawing.Text Imports System.Globalization Imports System.Text Imports System.Collections Public Class MainClass

   Shared Sub Main()
       
       Dim myform As Form = New PathFlattenForm()
       Application.Run(myform)
   End Sub

End Class

Public Class PathFlattenForm

   Inherits System.Windows.Forms.Form

1. Region " Windows Form Designer generated code "

   Public Sub New()
       MyBase.New()
       "This call is required by the Windows Form Designer.
       InitializeComponent()
       "Add any initialization after the InitializeComponent() call
   End Sub
   "Form overrides dispose to clean up the component list.
   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
       If disposing Then
           If Not (components Is Nothing) Then
               components.Dispose()
           End If
       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()
       "
       "PathFlattenForm
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(416, 126)
       Me.Name = "PathFlattenForm"
       Me.Text = "PathFlattenForm"
   End Sub

1. End Region

   Sub PathFlattenForm_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) Handles MyBase.Paint
       Dim g As Graphics = e.Graphics
       Dim width As Single = Me.ClientSize.Width
       Dim height As Single = Me.ClientSize.Height
       Dim rect As RectangleF = New RectangleF(0, 0, width, height)
       Dim format As StringFormat = New StringFormat()
       format.Alignment = StringAlignment.Center
       format.LineAlignment = StringAlignment.Center
       Dim path As GraphicsPath = New GraphicsPath()
       path.Reset()
       path.AddEllipse(rect)
       g.DrawPath(Pens.Black, path)
       g.DrawString("Ellipse", Me.Font, Brushes.Black, rect, format)
       g.TranslateTransform(width, 0)
   End Sub

End Class

      </source>