VB.Net/2D/Curve

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Curve Demo

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

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

End Class Public Class CurvesForm

   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 = "CurvesForm"
   End Sub
  1. End Region
   Private Sub CurvesForm_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) Handles MyBase.Paint
       Dim g As Graphics = e.Graphics
       Dim x As Integer = 0
       Dim y As Integer = 0
       Dim width As Integer = Me.ClientRectangle.Width / 3
       Dim height As Integer = Me.ClientRectangle.Height
       Dim blackBrush As Brush = Brushes.Black
       Dim fillBrush As Brush = Brushes.Gray
       Dim whitePen As Pen = Pens.White
       Dim format As StringFormat = New StringFormat()
       format.Alignment = StringAlignment.Center
       format.LineAlignment = StringAlignment.Center
       Dim pen As Pen = New Pen(Color.Red, 4)
       Dim pointPen As Pen = New Pen(Color.Black, 3)
       pointPen.StartCap = pointPen.EndCap = LineCap.SquareAnchor
       Dim tension As Single = 0
       Dim points As PointF() = New PointF() {New PointF(x + 25, y + height - 25), New PointF(x + width - 25, y + height - 25), New PointF(x + 25, y + 25), New PointF(x + width - 25, y + 25)}
       g.DrawRectangle(Pens.Black, x, y, width, height)
       g.DrawCurve(pen, points, tension)
       Dim point As PointF
       For Each point In points
           g.DrawLine(pointPen, New Point(point.X, point.Y), New Point(point.X + 1, point.Y))
       Next
       Dim i As Integer
       For i = 0 To points.Length - 1
           g.DrawString(i.ToString(), Me.Font, blackBrush, points(i))
       Next
       x = IIf(x > Me.ClientRectangle.Width - 2 * width, 0, x + width)
       y = IIf(x = 0, y + height, y)
       tension = 0.5
       points = New PointF() {New PointF(x + 25, y + 25), New PointF(x + width - 25, y + 25), New PointF(x + width - 25, y + height - 25), New PointF(x + 25, y + height - 25)}
       g.DrawRectangle(Pens.Black, x, y, width, height)
       g.DrawCurve(pen, points, tension)
       For Each point In points
           g.DrawLine(pointPen, New Point(point.X, point.Y), New Point(point.X + 1, point.Y))
       Next
       For i = 0 To points.Length - 1
           g.DrawString(i.ToString(), Me.Font, blackBrush, points(i))
       Next
       x = IIf(x > Me.ClientRectangle.Width - 2 * width, 0, x + width)
       y = IIf(x = 0, y + height, y)
       tension = 1.0
       points = New PointF() {New PointF(x + 25, y + 25), New PointF(x + width - 25, y + 25), New PointF(x + 25, y + height - 25), New PointF(x + width - 25, y + height - 25)}
       g.DrawRectangle(Pens.Black, x, y, width, height)
       g.DrawCurve(pen, points, tension)
       For Each point In points
           g.DrawLine(pointPen, New Point(point.X, point.Y), New Point(point.X + 1, point.Y))
       Next
       For i = 0 To points.Length - 1
           g.DrawString(i.ToString(), Me.Font, blackBrush, points(i))
       Next
       x = IIf(x > Me.ClientRectangle.Width - 2 * width, 0, x + width)
       y = IIf(x = 0, y + height, y)
   End Sub

End Class

      </source>


DrawClosedCurve(curve_pen, pts) Demo

<source lang="vbnet"> Imports System Imports System.Windows.Forms Imports System.Drawing.Text Imports System.Drawing 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
       " Define the curve"s control points.
       Dim pts() As Point = { _
           New Point(200, 30), _
           New Point(200, 150), _
           New Point(10, 50), _
           New Point(250, 200), _
           New Point(20, 200), _
           New Point(250, 50), _
           New Point(100, 250) _
       }
       " Draw the closed curve.
       e.Graphics.SmoothingMode = Drawing2D.SmoothingMode.HighQuality
       Dim curve_pen As New Pen(Color.Black, 3)
       e.Graphics.DrawClosedCurve(curve_pen, pts)
       " Draw rectangles on the control points.
       For i As Integer = 0 To pts.Length - 1
           e.Graphics.FillRectangle(Brushes.White, pts(i).X - 2, pts(i).Y - 2, 5, 5)
           e.Graphics.DrawRectangle(Pens.Black, pts(i).X - 2, pts(i).Y - 2, 5, 5)
       Next i
   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(364, 309)
       Me.Name = "Form1"
       Me.Text = "Title"
       Me.ResumeLayout(False)
   End Sub

End Class

      </source>


Draw Closed Curve Demo

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

  Shared Sub Main()
      Dim form1 As Form = New Form1()
      Application.Run(form1)
  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 x As Integer = 25
       Dim y As Integer = 25
       Const WID As Integer = 100
       Dim the_pen As New Pen(Color.White, 20)
       Dim rect As New Rectangle(x, y, WID, WID)
       the_pen.Alignment = PenAlignment.Right
       Dim pts() As Point = { _
            New Point(x, y), _
            New Point(x + WID \ 2, y), _
            New Point(x + WID, y + WID), _
            New Point(x, y + WID \ 2) _
       }
       
       e.Graphics.DrawClosedCurve(the_pen, pts)
       e.Graphics.DrawClosedCurve(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(200, 200)
       Me.Name = "Form1"
       Me.Text = ""
       Me.ResumeLayout(False)
   End Sub

End Class


      </source>