VB.Net/2D/Curve

Curve Demo

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
#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
#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

DrawClosedCurve(curve_pen, pts) Demo

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

Draw Closed Curve Demo

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