Mega Code Archive
Use mouse to draw a polygon
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Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
Imports System.Collections
public class DrawPolygon
public Shared Sub Main
Application.Run(New FrmPolygon)
End Sub
End class
Public Class FrmPolygon
Inherits System.Windows.Forms.Form
' polygon type options
Friend WithEvents filledPolygonRadio As RadioButton
Friend WithEvents lineRadio As RadioButton
Friend WithEvents polygonRadio As RadioButton
' command buttons
Friend WithEvents cmdClear As Button
Friend WithEvents cmdNewColor As Button
Friend WithEvents drawWindow As Panel
Friend WithEvents typeGroup As GroupBox
#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.ComponentModel.Container
'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.typeGroup = New System.Windows.Forms.GroupBox()
Me.filledPolygonRadio = New System.Windows.Forms.RadioButton()
Me.lineRadio = New System.Windows.Forms.RadioButton()
Me.polygonRadio = New System.Windows.Forms.RadioButton()
Me.drawWindow = New System.Windows.Forms.Panel()
Me.cmdClear = New System.Windows.Forms.Button()
Me.cmdNewColor = New System.Windows.Forms.Button()
Me.typeGroup.SuspendLayout()
Me.SuspendLayout()
'
'typeGroup
'
Me.typeGroup.Controls.AddRange(New System.Windows.Forms.Control() {Me.filledPolygonRadio, Me.lineRadio, Me.polygonRadio})
Me.typeGroup.Location = New System.Drawing.Point(232, 8)
Me.typeGroup.Name = "typeGroup"
Me.typeGroup.Size = New System.Drawing.Size(128, 104)
Me.typeGroup.TabIndex = 0
Me.typeGroup.TabStop = False
Me.typeGroup.Text = "Select Type"
'
'filledPolygonRadio
'
Me.filledPolygonRadio.Location = New System.Drawing.Point(8, 80)
Me.filledPolygonRadio.Name = "filledPolygonRadio"
Me.filledPolygonRadio.Size = New System.Drawing.Size(112, 16)
Me.filledPolygonRadio.TabIndex = 2
Me.filledPolygonRadio.Text = "Filled Polygon"
'
'lineRadio
'
Me.lineRadio.Location = New System.Drawing.Point(8, 24)
Me.lineRadio.Name = "lineRadio"
Me.lineRadio.Size = New System.Drawing.Size(112, 16)
Me.lineRadio.TabIndex = 1
Me.lineRadio.Text = "Lines"
'
'polygonRadio
'
Me.polygonRadio.Location = New System.Drawing.Point(8, 48)
Me.polygonRadio.Name = "polygonRadio"
Me.polygonRadio.Size = New System.Drawing.Size(112, 24)
Me.polygonRadio.TabIndex = 0
Me.polygonRadio.Text = "Polygon"
'
'drawWindow
'
Me.drawWindow.BackColor = System.Drawing.SystemColors.Window
Me.drawWindow.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
Me.drawWindow.Name = "drawWindow"
Me.drawWindow.Size = New System.Drawing.Size(232, 264)
Me.drawWindow.TabIndex = 1
'
'cmdClear
'
Me.cmdClear.Location = New System.Drawing.Point(240, 160)
Me.cmdClear.Name = "cmdClear"
Me.cmdClear.Size = New System.Drawing.Size(112, 24)
Me.cmdClear.TabIndex = 2
Me.cmdClear.Text = "Clear"
'
'cmdNewColor
'
Me.cmdNewColor.Location = New System.Drawing.Point(240, 192)
Me.cmdNewColor.Name = "cmdNewColor"
Me.cmdNewColor.Size = New System.Drawing.Size(112, 24)
Me.cmdNewColor.TabIndex = 3
Me.cmdNewColor.Text = "Change Color"
'
'FrmPolygon
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(360, 269)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.cmdNewColor, Me.cmdClear, Me.drawWindow, Me.typeGroup})
Me.Name = "FrmPolygon"
Me.Text = "Drawing Polygons"
Me.typeGroup.ResumeLayout(False)
Me.ResumeLayout(False)
End Sub
#End Region
Private mPoints As ArrayList = New ArrayList()
Dim mPen As Pen = New Pen(Color.DarkBlue)
Dim mBrush As SolidBrush = New SolidBrush(Color.DarkBlue)
Private Sub drawWindow_MouseDown(ByVal sender _
As Object, ByVal e As _
System.Windows.Forms.MouseEventArgs) _
Handles drawWindow.MouseDown
mPoints.Add(New Point(e.X, e.Y))
drawWindow.Invalidate() ' refresh panel
End Sub ' drawWindow_MouseDown
Private Sub drawWindow_Paint(ByVal sender As Object, _
ByVal e As System.Windows.Forms.PaintEventArgs) _
Handles drawWindow.Paint
Dim graphicsObject As Graphics = e.Graphics
If mPoints.Count < 1 Then
Return
End If
Dim pointArray() As Point = mPoints.ToArray(mPoints(0).GetType())
If polygonRadio.Checked Then
graphicsObject.DrawPolygon(mPen, pointArray)
ElseIf lineRadio.Checked Then
graphicsObject.DrawLines(mPen, pointArray)
ElseIf filledPolygonRadio.Checked Then
graphicsObject.FillPolygon(mBrush, pointArray)
End If
End Sub
Private Sub cmdClear_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles cmdClear.Click
mPoints.Clear()
drawWindow.Invalidate()
End Sub
Private Sub polygonRadio_CheckedChanged(ByVal sender As _
System.Object, ByVal e As System.EventArgs) _
Handles polygonRadio.CheckedChanged
drawWindow.Invalidate()
End Sub
Private Sub lineRadio_CheckedChanged(ByVal sender As _
System.Object, ByVal e As System.EventArgs) _
Handles lineRadio.CheckedChanged
drawWindow.Invalidate()
End Sub
Private Sub filledPolygonRadio_CheckedChanged(ByVal sender _
As System.Object, ByVal e As System.EventArgs) _
Handles filledPolygonRadio.CheckedChanged
drawWindow.Invalidate()
End Sub
Private Sub cmdNewColor_Click(ByVal sender As _
System.Object, ByVal e As System.EventArgs) _
Handles cmdNewColor.Click
Dim colorBox As ColorDialog = New ColorDialog()
Dim result As DialogResult = colorBox.ShowDialog()
If result = DialogResult.Cancel Then
Return
End If
mPen.Color = colorBox.Color
mBrush.Color = colorBox.Color
drawWindow.Invalidate()
End Sub
End Class
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