VB.Net Tutorial/2D Graphics/Image — различия между версиями

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Текущая версия на 15:54, 26 мая 2010

Get Image PropertyItems

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

  public Shared Sub Main
       Dim curImage As Image = Image.FromFile("yourfile.JPG")
       Dim imgProperties As PropertyItem() = curImage.PropertyItems
       Console.WriteLine(imgProperties.Length.ToString())
       Dim i As Integer
       For i = 0 To imgProperties.Length - 1
           Console.WriteLine("Id :" + imgProperties(i).Id.ToString)
           Console.WriteLine("Value:" + BitConverter.ToString(imgProperties(i).Value))
       Next i
  End Sub

End class</source>

Image Convert

<source lang="vbnet">Imports System Imports System.Drawing Imports System.Collections Imports System.ruponentModel Imports System.Windows.Forms Imports System.Data Imports System.Drawing.Imaging

public class ImageConverter

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

End class Public Class Form1

   Inherits System.Windows.Forms.Form
   Private curImage As Image
  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.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.
   Friend WithEvents SaveFormatCombo As System.Windows.Forms.ruboBox
   Friend WithEvents ConvertToBtn As System.Windows.Forms.Button
   Friend WithEvents ViewImgBtn As System.Windows.Forms.Button
   Friend WithEvents pictureBox1 As System.Windows.Forms.PictureBox
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
       Me.SaveFormatCombo = New System.Windows.Forms.ruboBox
       Me.ConvertToBtn = New System.Windows.Forms.Button
       Me.ViewImgBtn = New System.Windows.Forms.Button
       Me.pictureBox1 = New System.Windows.Forms.PictureBox
       Me.SuspendLayout()
       "
       "SaveFormatCombo
       "
       Me.SaveFormatCombo.Items.AddRange(New Object() {"bmp", "jpg", "wmf", "gif", "emf"})
       Me.SaveFormatCombo.Location = New System.Drawing.Point(404, 214)
       Me.SaveFormatCombo.Name = "SaveFormatCombo"
       Me.SaveFormatCombo.Size = New System.Drawing.Size(96, 21)
       Me.SaveFormatCombo.TabIndex = 7
       Me.SaveFormatCombo.Text = "bmp"
       "
       "ConvertToBtn
       "
       Me.ConvertToBtn.Location = New System.Drawing.Point(404, 182)
       Me.ConvertToBtn.Name = "ConvertToBtn"
       Me.ConvertToBtn.Size = New System.Drawing.Size(96, 24)
       Me.ConvertToBtn.TabIndex = 6
       Me.ConvertToBtn.Text = "Convert Now"
       "
       "ViewImgBtn
       "
       Me.ViewImgBtn.Location = New System.Drawing.Point(404, 38)
       Me.ViewImgBtn.Name = "ViewImgBtn"
       Me.ViewImgBtn.Size = New System.Drawing.Size(88, 24)
       Me.ViewImgBtn.TabIndex = 5
       Me.ViewImgBtn.Text = "View Image"
       "
       "pictureBox1
       "
       Me.pictureBox1.Location = New System.Drawing.Point(4, 30)
       Me.pictureBox1.Name = "pictureBox1"
       Me.pictureBox1.Size = New System.Drawing.Size(368, 328)
       Me.pictureBox1.TabIndex = 4
       Me.pictureBox1.TabStop = False
       "
       "Form1
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(504, 389)
       Me.Controls.Add(Me.SaveFormatCombo)
       Me.Controls.Add(Me.ConvertToBtn)
       Me.Controls.Add(Me.ViewImgBtn)
       Me.Controls.Add(Me.pictureBox1)
       Me.Name = "Form1"
       Me.Text = "GDI+ Image Convertor"
       Me.ResumeLayout(False)
   End Sub
  1. End Region
   Private Sub ViewImgBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ViewImgBtn.Click
       Dim openDlg As New OpenFileDialog   "
       openDlg.Filter = "All Image files|*.bmp;*.gif;*.jpg;*.ico;*.emf,*.wmf|Bitmap Files(*.bmp;*.gif;*.jpg;*.ico)|*.bmp;*.gif;*.jpg;*.ico|Meta Files(*.emf;*.wmf)|*.emf;*.wmf"
       Dim filter As String = openDlg.Filter
       openDlg.InitialDirectory = Environment.CurrentDirectory
       openDlg.Title = "Open Image File"
       openDlg.ShowHelp = True
       If openDlg.ShowDialog() = DialogResult.OK Then
           curImage = Image.FromFile(openDlg.FileName)
           pictureBox1.Width = curImage.Width
           pictureBox1.Height = curImage.Height
           pictureBox1.Image = curImage
           pictureBox1.Visible = True
       End If
   End Sub
   Private Sub ConvertToBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ConvertToBtn.Click
       Dim imgStream As New System.IO.MemoryStream
       Dim imgConverter As New ImageConverter
   End Sub

End Class</source>

Image Properties

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

  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 curImage As Image = Image.FromFile("yourfile.jpg")
       curImage.RotateFlip(RotateFlipType.RotateNoneFlipXY)
       e.Graphics.DrawImage(curImage, New Rectangle(0, 0, 100, 100))
       Console.WriteLine("Size:" + curImage.Size.ToString)
       Console.WriteLine(" RawFormat:" + curImage.RawFormat.ToString)
       Console.WriteLine(" Vertical Resolution:" + curImage.VerticalResolution.ToString)
       Console.WriteLine(" Horizontal Resolution:" + curImage.HorizontalResolution.ToString)
       Console.WriteLine(" PixelFormat:" + curImage.PixelFormat.ToString)
       Console.WriteLine(" Flags:" + curImage.Flags.ToString)
       
 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>

Save Image with different size

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

  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 curImage As Image = Image.FromFile("yourfile.jpg")
       curImage.RotateFlip(RotateFlipType.RotateNoneFlipXY)
       e.Graphics.DrawImage(curImage, New Rectangle(0, 0, 100, 100))
       Dim newImage As New Bitmap(curImage, New Size(100, 100))
       newImage.Save("newImage.bmp", ImageFormat.Bmp)
       
 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>