VB.Net/2D/Fill Mode

Fill Mode 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 FillModesForm()
        Application.Run(myform)
    End Sub
End Class
Public Class FillModesForm
    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 = "FillModesForm"
    End Sub
#End Region

    Private Sub FillModesForm_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 / 2
        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 fill As FillMode = FillMode.Winding
        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, height / 2), New PointF(x + width - 25, y + 25), New PointF(x + 25, y + 25), New PointF(x + width - 25, height / 2)}
        g.DrawRectangle(Pens.Black, x, y, width, height)
        g.FillClosedCurve(fillBrush, points, fill)
        g.DrawClosedCurve(pen, points)
        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)
        fill = FillMode.Alternate
        points = New PointF() {New PointF(x + 25, y + height - 25), New PointF(x + width - 25, y + height - 25), New PointF(x + 25, height / 2), New PointF(x + width - 25, y + 25), New PointF(x + 25, y + 25), New PointF(x + width - 25, height / 2)}
        g.DrawRectangle(Pens.Black, x, y, width, height)
        g.FillClosedCurve(fillBrush, points, fill)
        g.DrawClosedCurve(pen, points)
        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