VB.Net Tutorial/GUI/Irregular Window

Drag and drop irregular window

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class TransparentFormDemo
   public Shared Sub Main
        Application.Run(New TransparentForm)
   End Sub
End class
Public Class TransparentForm
    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
        Me.SetStyle(ControlStyles.ResizeRedraw, True)
    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()
        "
        "TransparentForm
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(208, 68)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None
        Me.Name = "TransparentForm"
        Me.Text = "Transparency Test"
    End Sub
#End Region
    Private Sub TransparentForm_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
        Dim g As Graphics = e.Graphics
        Dim pen As Pen = New Pen(Color.Red, 4)
        Dim rect As Rectangle = Me.ClientRectangle
        rect.Inflate(-2, -2)
        g.FillEllipse(Brushes.Yellow, rect)
        g.DrawEllipse(pen, rect)
        pen.Dispose()
    End Sub
    Sub SetEllipseRegion()
        Dim rect As Rectangle = Me.ClientRectangle
        Dim path As GraphicsPath = New GraphicsPath()
        path.AddEllipse(RectangleF.op_Implicit(rect))
        Me.Region = New Region(path)
        path.Dispose()
    End Sub
    Private Sub TransparentForm_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
        SetEllipseRegion()
    End Sub
    Private Sub TransparentForm_SizeChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.SizeChanged
        SetEllipseRegion()
    End Sub
    Dim downpoint As Point = Point.Empty
    Private Sub TransparentForm_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseDown
        If e.Button <> MouseButtons.Left Then Exit Sub
        downpoint = New Point(e.X, e.Y)
    End Sub
    Private Sub TransparentForm_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseMove
        If downpoint = Point.Empty Then Exit Sub
        Dim location As Point = New Point(me.Left + e.X - downpoint.X, me.Top + e.Y - downpoint.Y)
        Me.Location = location
    End Sub
    Private Sub TransparentForm_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseUp
        If e.Button <> MouseButtons.Left Then Exit Sub
        downpoint = Point.Empty
    End Sub
End Class

Form Hole

Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Drawing2D
public class FormHole
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        TransparencyKey = BackColor
        Label1.BackColor = TransparencyKey
    End Sub
    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        Dim thick_pen As New Pen(Color.Black, 10)
        Dim rect As New Rectangle( _
            e.ClipRectangle.X + 10, _
            e.ClipRectangle.Y + 10, _
            e.ClipRectangle.Width - 20, _
            e.ClipRectangle.Height - 20)
        e.Graphics.DrawEllipse(thick_pen, rect)
        thick_pen.Dispose()
    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 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.Label1 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        "
        "Label1
        "
        Me.Label1.AutoSize = True
        Me.Label1.BackColor = System.Drawing.SystemColors.Control
        Me.Label1.Font = New System.Drawing.Font("Forte", 48.0!, System.Drawing.FontStyle.Italic, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label1.Location = New System.Drawing.Point(48, 56)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(169, 70)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "Hole"
        Me.Label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter
        "
        "Form1
        "
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.BackColor = System.Drawing.Color.Red
        Me.ClientSize = New System.Drawing.Size(274, 187)
        Me.Controls.Add(Me.Label1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
        Me.PerformLayout()
    End Sub
    Friend WithEvents Label1 As System.Windows.Forms.Label
End Class

Resize irregular window

" Quote from
"Windows Forms Programming in VB
"by Chris Sells (Author), Justin Gehtland (Author)
"Publisher: Addison-Wesley Professional; 1st edition (October 24, 2003)
"Language: English
"ISBN-10: 0321125193
"ISBN-13: 978-0321125194
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class TransparentFormDemo
   public Shared Sub Main
        Application.Run(New TransparentForm)
   End Sub
End class
Public Class TransparentForm
    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
        Me.SetStyle(ControlStyles.ResizeRedraw, True)
    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()
        "
        "TransparentForm
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(208, 68)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None
        Me.Name = "TransparentForm"
        Me.Text = "Transparency Test"
    End Sub
#End Region
    Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
        MyBase.WndProc(m)
        Dim WM_NCHITTEST As Integer = &H84
        If m.Msg <> WM_NCHITTEST Then Exit Sub
        Dim HTCLIENT As Integer = 1
        Dim HTCAPTION As Integer = 2
        If m.Result.ToInt32() = HTCLIENT Then m.Result = New IntPtr(HTCAPTION)
        Dim HTLEFT As Integer = 10
        Dim HTRIGHT As Integer = 11
        Dim HTTOP As Integer = 12
        Dim HTTOPLEFT As Integer = 13
        Dim HTTOPRIGHT As Integer = 14
        Dim HTBOTTOM As Integer = 15
        Dim HTBOTTOMLEFT As Integer = 16
        Dim HTBOTTOMRIGHT As Integer = 17
        Dim clientLocation As Point = Me.PointToClient(New Point(m.LParam.ToInt32))
        Dim x As Integer = clientLocation.X 
        Dim y As Integer = clientLocation.Y 
        If x = 0 And y = 0 Then
            m.Result = New IntPtr(HTCAPTION)
            Exit Sub
        ElseIf x = 0 And y >= 0 Then
            m.Result = New IntPtr(HTRIGHT)
            Exit Sub
        ElseIf x = 0 Then
            m.Result = New IntPtr(HTLEFT)
            Exit Sub
        ElseIf y = 0 And x >= 0 Then
            m.Result = New IntPtr(HTTOP)
            Exit Sub
        ElseIf y = 0 Then
            m.Result = New IntPtr(HTBOTTOM)
            Exit Sub
        End If
        Dim slopeAbs As Double = Math.Abs(CDbl(y) / CDbl(x))
        If x > 0 And y > 0 Then
            " Q1
            If slopeAbs > 2 Then
                m.Result = New IntPtr(HTTOP)
            ElseIf slopeAbs < 0.5 Then
                m.Result = New IntPtr(HTRIGHT)
            Else
                m.Result = New IntPtr(HTTOPRIGHT)
            End If
        ElseIf x > 0 And y < 0 Then
            " Q2
            If slopeAbs > 2 Then
                m.Result = New IntPtr(HTBOTTOM)
            ElseIf slopeAbs < 0.5 Then
                m.Result = New IntPtr(HTRIGHT)
            Else
                m.Result = New IntPtr(HTBOTTOMRIGHT)
            End If
        ElseIf x < 0 And y < 0 Then
            " Q3
            If slopeAbs > 2 Then
                m.Result = New IntPtr(HTBOTTOM)
            ElseIf slopeAbs < 0.5 Then
                m.Result = New IntPtr(HTLEFT)
            Else
                m.Result = New IntPtr(HTBOTTOMLEFT)
            End If
        Else
            " Q4
            If slopeAbs > 2 Then
                m.Result = New IntPtr(HTTOP)
            ElseIf slopeAbs < 0.5 Then
                m.Result = New IntPtr(HTLEFT)
            Else
                m.Result = New IntPtr(HTTOPLEFT)
            End If
        End If
    End Sub
End Class