VB.Net/2D/Curve
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
- 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
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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
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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
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