VB.Net/2D/Line

Draw Colorful Line and Dash Line

Imports System
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
Imports System.Drawing.Text
Public Class MainClass
   Shared Sub Main()
        Dim myform As Form = New FrmDrawShapes()
        Application.Run(myform)
   End Sub " Main
End Class

Public Class FrmDrawShapes
   Inherits System.Windows.Forms.Form
#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.Container
   "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()
      "
      "frmDrawShapes
      "
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.ClientSize = New System.Drawing.Size(520, 197)
      Me.Name = "frmDrawShapes"
      Me.Text = "Drawing Shapes"
   End Sub
#End Region
   " draw various shapes on form
   Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
      Dim graphicsObject As Graphics = e.Graphics
      " bitmap texture
      Dim textureBitmap As Bitmap = New Bitmap(10, 10)
      Dim graphicsObject2 As Graphics = _
         Graphics.FromImage(textureBitmap) " get bitmap graphics
      " brush and pen used throughout program
      Dim solidColorBrush As SolidBrush = _
         New SolidBrush(Color.Red)
      Dim coloredPen As Pen = New Pen(solidColorBrush)
      " draw pie-shaped arc in white
      coloredPen.Color = Color.White
      coloredPen.Width = 6
      graphicsObject.DrawPie(coloredPen, 240, 30, 75, 100, 0, 270)
      " draw lines in green and yellow
      coloredPen.Color = Color.Green
      coloredPen.Width = 5
      graphicsObject.DrawLine(coloredPen, 395, 30, 320, 150)
      " draw a rounded, dashed yellow line
      coloredPen.Color = Color.Yellow
      coloredPen.DashCap = LineCap.Round
      coloredPen.DashStyle = DashStyle.Dash
      graphicsObject.DrawLine(coloredPen, 320, 30, 395, 150)
   End Sub " OnPaint
End Class

Draw lines to connect rectangles

Imports System
Imports System.Drawing
Imports System.Windows.Forms
Imports System.Drawing.Text
Public Class MainClass
   Shared Sub Main()
        Dim myform As Form = New FrmDrawing()
        Application.Run(myform)
   End Sub " Main
End Class

Public Class FrmDrawing
   Inherits System.Windows.Forms.Form
#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.Container
   "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()
      "
      "frmDrawing
      "
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.BackColor = System.Drawing.SystemColors.AppWorkspace
      Me.ClientSize = New System.Drawing.Size(472, 157)
      Me.Name = "frmDrawing"
      Me.Text = "Drawing lines, rectangles and ovals"
   End Sub
#End Region
   " display ovals lines, and rectangles
   Protected Overrides Sub OnPaint( _
      ByVal paintEvent As PaintEventArgs)
      " get graphics object
      Dim g As Graphics = paintEvent.Graphics
      Dim brush As SolidBrush = New SolidBrush(Color.Blue)
      Dim pen As Pen = New Pen(Color.AliceBlue)
      " draw lines to connect rectangles
      g.DrawLine(pen, 90, 30, 110, 40)
      g.DrawLine(pen, 90, 120, 110, 130)
      g.DrawLine(pen, 240, 30, 260, 40)
      g.DrawLine(pen, 240, 120, 260, 130)

      " draw top rectangle
      g.DrawRectangle(pen, 110, 40, 150, 90)
   End Sub " OnPaint
End Class " FrmDrawing

Paint Lines

Imports System
Imports System.Drawing
Imports System.Drawing.Printing
Imports System.Collections
Imports System.ruponentModel
Imports System.Windows.Forms
Imports System.Drawing.Drawing2D
Class MyFirstForm
    Inherits Form

    Public Sub Draw(ByVal g As Graphics)
        g.SmoothingMode = SmoothingMode.AntiAlias
        Dim rect As Rectangle = Me.ClientRectangle
        Dim cx As Integer = rect.Width
        Dim cy As Integer = rect.Height
        Dim scale As Single = CSng(cy) / CSng(cx)
        Dim _brush As LinearGradientBrush = New LinearGradientBrush(Me.ClientRectangle, Color.Empty, Color.Empty, 45)
        Dim blend As ColorBlend = New ColorBlend()
        blend.Colors = New Color() {Color.Red, Color.Green, Color.Blue}
        blend.Positions = New Single() {0.0, 0.5, 1.0}
        _brush.InterpolationColors = blend
        Dim _pen As Pen = New Pen(_brush)
        Dim x As Integer
        For x = 0 To cx Step 7
            g.DrawLine(_pen, 0, x * scale, cx - x, 0)
            g.DrawLine(_pen, 0, (cx - x) * scale, cx - x, cx * scale)
            g.DrawLine(_pen, cx - x, 0 * scale, cx, (cx - x) * scale)
            g.DrawLine(_pen, cx - x, cx * scale, cx, x * scale)
        Next
        Dim format As StringFormat = New StringFormat()
        format.Alignment = StringAlignment.Center
        format.LineAlignment = StringAlignment.Center
        Dim s As String = "Ain"t graphics cool?"
        g.DrawString(s, Me.Font, _brush, rect.X, rect.Y, format)
    End Sub
    Private Sub MyPaint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
        Dim g As Graphics = e.Graphics
        Draw(g)
    End Sub
    Shared Sub Main()
        Dim myform As Form = New MyFirstForm()
        Application.Run(myform)
    End Sub
End Class

Use Texture Brush to Draw a Line

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

Public Class MainClass
  Shared Sub Main()
     Dim form1 As Form1 = new Form1
     Application.Run(form1)
  End Sub
  
End Class


Public Class Form1
  Inherits System.Windows.Forms.Form
#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()
    Me.SuspendLayout()
    "
    "Form1
    "
    Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
    Me.ClientSize = New System.Drawing.Size(392, 213)
    Me.Controls.AddRange(New System.Windows.Forms.Control() {})
    Me.Name = "Form1"
    Me.Text = "Form1"
    Me.ResumeLayout(False)
  End Sub
#End Region
  Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
  End Sub
  Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
    Dim G As Graphics = e.Graphics
    Dim P1 As Pen = New Pen(Color.Blue, 10)
    "pentype
    Dim P3 As Pen = New Pen(Color.Blue, 10)
    P3.Brush = New TextureBrush(New Bitmap("figure2.bmp"))
    G.DrawLine(P3, 20, CInt(Me.Height / 2), Me.Width - 20, CInt(Me.Height / 2))
  End Sub
End Class