VB.Net/2D/LineCaps

Custom Line Cap Construction

Imports System
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Drawing.Text
Imports System.Drawing.Imaging
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()
    "
    "Form1
    "
    Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
    Me.ClientSize = New System.Drawing.Size(292, 273)
    Me.Name = "Form1"
    Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
    Me.Text = "Form1"
  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 P As Pen = New Pen(Color.Blue, 1)
    Dim Pts() As Point = {New Point(10, 10), _
                    New Point(15, 10), _
                    New Point(20, 15), _
                    New Point(20, 20), _
                    New Point(15, 25), _
                    New Point(10, 10)}
    Dim Path As GraphicsPath = New GraphicsPath()
    Path.AddLines(Pts)
    G.SmoothingMode = SmoothingMode.AntiAlias
    Dim MyCustomLineCap As CustomLineCap = New CustomLineCap(Nothing, Path)
    MyCustomLineCap.BaseInset = 0
    MyCustomLineCap.WidthScale = 1
    MyCustomLineCap.StrokeJoin = LineJoin.Miter
    P.CustomEndCap = MyCustomLineCap
    P.CustomStartCap = MyCustomLineCap
    G.DrawLine(P, 50, 150, 200, 150)
    MyCustomLineCap.Dispose()
    Path.Dispose()
    P.Dispose()
  End Sub
End Class

Custom Line Caps

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

Public Class MainClass
   Shared Sub Main()
       Dim form1 As Form = New Form1()
       Application.Run(form1)
   End Sub " ValidationError
End Class
 
 

Public Class Form1
    Private Sub Form1_Paint(ByVal sender As Object, _
     ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        " Make a GraphicsPath that draws an X.
        Dim pts() As Point = { _
            New Point(-20, -20), _
            New Point(0, 0), _
            New Point(-20, 20), _
            New Point(0, 0), _
            New Point(20, 20), _
            New Point(0, 0), _
            New Point(20, -20) _
        }
        Dim cap_path As New GraphicsPath
        cap_path.AddLines(pts)
        " Make the CustomLineCap.
        Dim x_cap As New CustomLineCap(Nothing, cap_path)
        " Draw some lines with x_cap.
        Dim the_pen As New Pen(Color.Black, 1)
        the_pen.CustomStartCap = x_cap
        the_pen.CustomEndCap = x_cap
        e.Graphics.DrawLine(the_pen, 50, 100, 200, 10)

    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(292, 273)
        Me.Name = "Form1"
        Me.Text = "TransformArrow"
        Me.ResumeLayout(False)
    End Sub
End Class

LineCap 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
        Dim x As Integer = 5
        Dim y As Integer = 10
        Dim the_pen As New Pen(Color.Black, 20)
        DrawSample(e.Graphics, x, y, Drawing2D.LineCap.AnchorMask)
        DrawSample(e.Graphics, x, y, Drawing2D.LineCap.ArrowAnchor)
        DrawSample(e.Graphics, x, y, Drawing2D.LineCap.DiamondAnchor)
        DrawSample(e.Graphics, x, y, Drawing2D.LineCap.Flat)
        DrawSample(e.Graphics, x, y, Drawing2D.LineCap.NoAnchor)
        DrawSample(e.Graphics, x, y, Drawing2D.LineCap.Round)
        DrawSample(e.Graphics, x, y, Drawing2D.LineCap.RoundAnchor)
        DrawSample(e.Graphics, x, y, Drawing2D.LineCap.Square)
        DrawSample(e.Graphics, x, y, Drawing2D.LineCap.SquareAnchor)
        DrawSample(e.Graphics, x, y, Drawing2D.LineCap.Triangle)
    End Sub
    Private Sub DrawSample(ByVal gr As Graphics, ByRef x As Integer, ByRef y As Integer, ByVal style As Drawing2D.LineCap)
        Dim the_pen As New Pen(Color.Black, 20)
        the_pen.EndCap = style
        gr.DrawString(style.ToString, Me.Font, Brushes.Black, x, y - 5)
        gr.DrawLine(the_pen, x + 100, y, x + 150, y)
        y += 50
        If y > Me.ClientRectangle.Height Then
            x += 200
            y = 80
        End If
    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(564, 209)
        Me.Name = "Form1"
        Me.Text = "Title"
        Me.ResumeLayout(False)
    End Sub
End Class

LineCaps 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
Public Class MainClass
    Shared Sub Main()
        Dim myform As Form = New LineCapsForm()
        Application.Run(myform)
    End Sub
End Class
Public Class LineCapsForm
    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 = "LineCapsForm"
    End Sub
#End Region

    Private Sub LineCapsForm_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) Handles MyBase.Paint
        Dim g As Graphics = e.Graphics
        Dim capNames As String() = System.Enum.GetNames(GetType(LineCap))
        Array.Sort(capNames)
        Dim x As Integer = 0
        Dim y As Integer = 0
        Dim width As Integer = Me.ClientRectangle.Width / 2
        Dim height As Integer = Me.ClientRectangle.Height / ((capNames.Length) / 2)
        Dim blackBrush As Brush = Brushes.Black
        Dim whitePen As Pen = Pens.White
        Dim capName As String
        For Each capName In capNames
            Dim pen As Pen = New Pen(Color.Black, 12)
            pen.EndCap = CType(System.Enum.Parse(GetType(LineCap), capName), LineCap)
            If pen.EndCap <> LineCap.AnchorMask Then
                If pen.EndCap = LineCap.Custom Then
                    pen.CustomEndCap = New AdjustableArrowCap(3, 3, False)
                End If
                g.DrawLine(pen, x, CInt(y + height * 2 / 3), CInt(x + width * 2 / 3), CInt(y + height * 2 / 3))
                g.DrawLine(whitePen, x, CInt(y + height * 2 / 3), CInt(x + width * 2 / 3), CInt(y + height * 2 / 3))
                g.DrawString(capName, Me.Font, blackBrush, x, y)
                x = x + width
                If x > Me.ClientRectangle.Width - width Then
                    y = y + height
                    x = 0
                End If
            End If
        Next
    End Sub
End Class