VB.Net/2D/Bitmap

Материал из VB Эксперт
Версия от 15:41, 26 мая 2010; Admin (обсуждение | вклад) (1 версия)
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Bitmap Information: Width, Height, Vertical Resolution, Pixel Format, Physical Dimension

<source lang="vbnet"> Imports System Imports System.Windows.Forms Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Drawing.Text Imports System.Drawing.Imaging Public Class MainClass

 Shared Sub Main()
   Dim Bmp As Bitmap = New Bitmap("figure2.bmp")
   Console.WriteLine(Bmp.Height.ToString())
   Console.WriteLine(Bmp.Width.ToString())
   Console.WriteLine(Bmp.VerticalResolution.ToString())
   Console.WriteLine(Bmp.HorizontalResolution.ToString())
   Console.WriteLine(Bmp.PixelFormat.ToString())
   Console.WriteLine(Bmp.Size.ToString())
   Console.WriteLine(Bmp.PhysicalDimension.ToString())
 End Sub
 

End Class


      </source>


Draw to a Bitmap object and save it as a image file

<source lang="vbnet"> Imports System Imports System.Windows.Forms Imports System.Collections.Generic Imports System.ruponentModel Imports System.Drawing.Imaging Imports System.Drawing Public Class MainClass

  Shared Sub Main()
       Dim bm As New Bitmap(256, 256)
       " Draw on it.
       Dim gr As Graphics = Graphics.FromImage(bm)
       gr.Clear(Color.White)
       gr.DrawEllipse(Pens.Red, 0, 0, bm.Width - 1, bm.Height - 1)
       gr.DrawLine(Pens.Green, 0, 0, bm.Width - 1, bm.Height - 1)
       gr.DrawLine(Pens.Blue, bm.Width - 1, 0, 0, bm.Height - 1)
       " Save the result as a JPEG file.
       bm.Save("test.gif", ImageFormat.Gif)
  End Sub 

End Class


      </source>


Load an Image from file and draw on the loaded image

<source lang="vbnet"> Imports System Imports System.Windows.Forms Imports System.Collections.Generic Imports System.ruponentModel Imports System.Drawing.Imaging Imports System.Drawing Public Class MainClass

  Shared Sub Main()
     Dim form1 As new Form1()
     Application.Run(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
       Dim bm As New Bitmap("figure2.bmp")
       " Make a copy.
       Dim new_bm As New Bitmap(bm)
       " Dispose of the original Bitmap.
       bm.Dispose()
       " Draw on the new Bitmap and display the result.
       Dim gr As Graphics = Graphics.FromImage(new_bm)
       gr.DrawEllipse(Pens.White, 0, 0, new_bm.Width - 1, new_bm.Height - 1)
       picImage.Image = new_bm
   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 Overloads 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.picImage = New System.Windows.Forms.PictureBox
       CType(Me.picImage, System.ruponentModel.ISupportInitialize).BeginInit()
       Me.SuspendLayout()
       "
       "picImage
       "
       Me.picImage.AutoSize = True
       Me.picImage.Location = New System.Drawing.Point(0, 0)
       Me.picImage.Name = "picImage"
       Me.picImage.Size = New System.Drawing.Size(100, 50)
       Me.picImage.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize
       Me.picImage.TabIndex = 0
       Me.picImage.TabStop = False
       "
       "Form1
       "
       Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
       Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
       Me.ClientSize = New System.Drawing.Size(240, 256)
       Me.Controls.Add(Me.picImage)
       Me.Name = "Form1"
       Me.Text = "LoadPicture"
       CType(Me.picImage, System.ruponentModel.ISupportInitialize).EndInit()
       Me.ResumeLayout(False)
       Me.PerformLayout()
   End Sub
   Friend WithEvents picImage As System.Windows.Forms.PictureBox

End Class

      </source>


Manipulate Bitmap Color

<source lang="vbnet"> Imports System Imports System.Windows.Forms Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Drawing.Text Imports System.Drawing.Imaging Public Class MainClass

 Shared Sub Main()
    Dim form1 As Form1 = new Form1
    Application.Run(form1)
 End Sub
 

End Class

Public Class Form1

 Inherits System.Windows.Forms.Form
  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.
 <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
   "
   "Form1
   "
   Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
   Me.ClientSize = New System.Drawing.Size(292, 273)
   Me.Name = "Form1"
   Me.Text = "Form1"
 End Sub
  1. End Region
 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 End Sub
 Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
   Dim bmp As Bitmap = New Bitmap("figure2.bmp")
   Dim c As Color
   Dim x, y As Int32
   e.Graphics.DrawImage(bmp, 10, 30)
   For x = 0 To bmp.Width - 1
     For y = 0 To bmp.Height - 1
       c = bmp.GetPixel(x, y)
       c = Color.FromArgb(c.ToArgb() + 100)
       bmp.SetPixel(x, y, c)
     Next
   Next
   e.Graphics.DrawImage(bmp, 150, 30)
 End Sub

End Class

      </source>


Output Color Palette for a Bitmap

<source lang="vbnet"> Imports System Imports System.Windows.Forms Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Drawing.Text Imports System.Drawing.Imaging Public Class MainClass

 Shared Sub Main()
   Dim cp As ColorPalette
   Dim bmp As Bitmap = New Bitmap("figure2.bmp")
   cp = bmp.Palette
   Dim c As Color
   For Each c In cp.Entries
     Console.WriteLine( c.ToString())
   Next
 End Sub
 

End Class


      </source>