VB.Net Tutorial/2D Graphics/Polygon

Материал из VB Эксперт
Версия от 15:55, 26 мая 2010; Admin (обсуждение | вклад) (1 версия)
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Draw a Polygon

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class DrawPolygon

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class public class Form1

 Inherits System.Windows.Forms.Form
 Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
       
       Dim points(3) As System.Drawing.Point
       points(0) = New Point(120, 60) "Top Left of Trapezoid
       points(1) = New Point(180, 60) "Top Right of Trapezoid
       points(2) = New Point(240, 120) "Bottom Right of Trapezoid
       points(3) = New Point(60, 120) "Bottom Left of Trapezoid
       e.Graphics.DrawPolygon(New Pen(Color.Blue), points)
 End Sub
 Public Sub New()
  
   MyBase.New()
   Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
   Me.ClientSize = New System.Drawing.Size(292, 273)
   Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
 End Sub

End Class</source>

Trapezoid

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class DrawPolygon

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class public class Form1

 Inherits System.Windows.Forms.Form
 Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
       
       Dim points(3) As System.Drawing.Point
       points(0) = New Point(120, 60) "Top Left of Trapezoid
       points(1) = New Point(180, 60) "Top Right of Trapezoid
       points(2) = New Point(240, 120) "Bottom Right of Trapezoid
       points(3) = New Point(60, 120) "Bottom Left of Trapezoid
       e.Graphics.DrawPolygon(New Pen(Color.Blue), points)
 End Sub
 Public Sub New()
  
   MyBase.New()
   Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
   Me.ClientSize = New System.Drawing.Size(292, 273)
   Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
 End Sub

End Class</source>

Use mouse to draw a polygon

<source lang="vbnet">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
  1. 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.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
  1. 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</source>