VB.Net Tutorial/2D Graphics/Bezier

Bezier Splines

Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Collections
public class BezierSplines
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

Public Class Form1
    Dim BendPoints As New Generic.List(Of Point)
    Private Sub Form1_MouseClick(ByVal sender As Object, _
          ByVal e As System.Windows.Forms.MouseEventArgs) _
          Handles Me.MouseClick
        BendPoints.Add(New Point(e.X, e.Y))
        Me.Refresh()
    End Sub
    Private Sub Form1_Paint(ByVal sender As Object, _
          ByVal e As System.Windows.Forms.PaintEventArgs) _
          Handles Me.Paint
        Dim canvas As Graphics = e.Graphics
        If (BendPoints.Count >= 4) Then
            canvas.DrawBezier(Pens.Black, BendPoints(0), BendPoints(1), BendPoints(2), BendPoints(3))
            BendPoints.Clear()
        End If
    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.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(531, 394)
        Me.Name = "Form1"
        Me.Text = "Drawing Bezier Splines"
        Me.ResumeLayout(False)
    End Sub
End Class

Draw Beziers 1

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class DrawBeziers1
   public Shared Sub Main
        Application.Run(New BeziersForm)
   End Sub
End class

Public Class BeziersForm
    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()
        components = New System.ruponentModel.Container()
        Me.Text = "BeziersForm"
    End Sub
#End Region

    Private Sub ClosedCurves_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 pen As Pen = New Pen(Color.Red, 4)
        Dim pointPen As Pen = New Pen(Color.Black, 3)
        pointPen.StartCap = pointPen.EndCap = LineCap.SquareAnchor
        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.DrawBeziers(pen, points)
        
    End Sub
End Class

Draw Beziers 2

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class DrawBeziers2
   public Shared Sub Main
        Application.Run(New BeziersForm)
   End Sub
End class

Public Class BeziersForm
    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()
        components = New System.ruponentModel.Container()
        Me.Text = "BeziersForm"
    End Sub
#End Region

    Private Sub ClosedCurves_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 pen As Pen = New Pen(Color.Red, 4)
        Dim pointPen As Pen = New Pen(Color.Black, 3)
        pointPen.StartCap = pointPen.EndCap = LineCap.SquareAnchor
        Dim points As PointF()
        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.DrawBeziers(pen, points)
        
    End Sub
End Class

Draw Beziers 3

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class DrawBeziers3
   public Shared Sub Main
        Application.Run(New BeziersForm)
   End Sub
End class

Public Class BeziersForm
    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()
        components = New System.ruponentModel.Container()
        Me.Text = "BeziersForm"
    End Sub
#End Region

    Private Sub ClosedCurves_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 pen As Pen = New Pen(Color.Red, 4)
        Dim pointPen As Pen = New Pen(Color.Black, 3)
        pointPen.StartCap = pointPen.EndCap = LineCap.SquareAnchor
        Dim points As PointF()
        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.DrawBeziers(pen, points)
        
    End Sub
End Class

Draw the Bezier curve and its outline

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class BezierCurveAndItsOutline
   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)
        " Define the Bezier curve"s control points.
        Dim pts() As Point = { _
            New Point(10, 10), _
            New Point(200, 10), _
            New Point(50, 200), _
            New Point(200, 150), _
            New Point(250, 50), _
            New Point(250, 200), _
            New Point(100, 250) _
        }
        Dim dashed_pen As New Pen(Color.Black, 0)
        dashed_pen.DashStyle = Drawing2D.DashStyle.Dash
        For i As Integer = 0 To pts.Length - 2
            e.Graphics.DrawLine(dashed_pen, pts(i), pts(i + 1))
        Next i
        " .
        e.Graphics.SmoothingMode = Drawing2D.SmoothingMode.HighQuality
        Dim bez_pen As New Pen(Color.Black, 3)
        e.Graphics.DrawBeziers(bez_pen, 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