VB.NET Bitmap类代码示例

Dim image1 As Bitmap

Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click

    Try
        ' Retrieve the image.
        image1 = New Bitmap( _
            "C:\Documents and Settings\All Users\Documents\My Music\music.bmp", _
            True)

        Dim x, y As Integer

        ' Loop through the images pixels to reset color.
        For x = 0 To image1.Width - 1
            For y = 0 To image1.Height - 1
                Dim pixelColor As Color = image1.GetPixel(x, y)
                Dim newColor As Color = _
                    Color.FromArgb(pixelColor.R, 0, 0)
                image1.SetPixel(x, y, newColor)
            Next
        Next

        ' Set the PictureBox to display the image.
        PictureBox1.Image = image1

        ' Display the pixel format in Label1.
        Label1.Text = "Pixel format: " + image1.PixelFormat.ToString()

    Catch ex As ArgumentException
        MessageBox.Show("There was an error." _
            & "Check the path to the image file.")
    End Try
End Sub

' 导入命名空间
Imports System.Drawing.Drawing2D
Imports System
Imports System.Drawing.Text
Imports System.Drawing
Imports System.Windows.Forms
Imports System.Math

Public Class MainClass

   Shared Sub Main()
       Dim form1 As Form = 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")
        Dim source_bm As New Bitmap(bm)
    
        bm.Dispose()
        picSource.Image = source_bm

        picDest.Size = picSource.Size

        Dim dest_bm As New Bitmap(source_bm)

        For y As Integer = 0 To dest_bm.Height - 1
            For x As Integer = 0 To dest_bm.Width - 1
                Dim clr As Color = dest_bm.GetPixel(x, y)
                clr = Color.FromArgb(255,255 - clr.R,255 - clr.G,255 - clr.B)
                dest_bm.SetPixel(x, y, clr)
            Next x
        Next y
        picDest.Image = dest_bm
    End Sub

End Class
 
 
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form

    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.SplitContainer1 = New System.Windows.Forms.SplitContainer
        Me.picSource = New System.Windows.Forms.PictureBox
        Me.picDest = New System.Windows.Forms.PictureBox
        Me.SplitContainer1.Panel1.SuspendLayout()
        Me.SplitContainer1.Panel2.SuspendLayout()
        Me.SplitContainer1.SuspendLayout()
        CType(Me.picSource, System.ComponentModel.ISupportInitialize).BeginInit()
        CType(Me.picDest, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'SplitContainer1
        '
        Me.SplitContainer1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.SplitContainer1.Location = New System.Drawing.Point(0, 24)
        Me.SplitContainer1.Name = "SplitContainer1"
        '
        'SplitContainer1.Panel1
        '
        Me.SplitContainer1.Panel1.AutoScroll = True
        Me.SplitContainer1.Panel1.Controls.Add(Me.picSource)
        '
        'SplitContainer1.Panel2
        '
        Me.SplitContainer1.Panel2.AutoScroll = True
        Me.SplitContainer1.Panel2.Controls.Add(Me.picDest)
        Me.SplitContainer1.Size = New System.Drawing.Size(522, 249)
        Me.SplitContainer1.SplitterDistance = 270
        Me.SplitContainer1.TabIndex = 1
        Me.SplitContainer1.Text = "SplitContainer1"
        '
        'picSource
        '
        Me.picSource.AutoSize = True
        Me.picSource.Location = New System.Drawing.Point(0, 0)
        Me.picSource.Name = "picSource"
        Me.picSource.Size = New System.Drawing.Size(208, 184)
        Me.picSource.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize
        Me.picSource.TabIndex = 0
        Me.picSource.TabStop = False
        '
        'picDest
        '
        Me.picDest.AutoSize = True
        Me.picDest.Location = New System.Drawing.Point(0, 0)
        Me.picDest.Name = "picDest"
        Me.picDest.Size = New System.Drawing.Size(184, 184)
        Me.picDest.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize
        Me.picDest.TabIndex = 1
        Me.picDest.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(522, 273)
        Me.Controls.Add(Me.SplitContainer1)
        Me.Name = "Form1"
        Me.Text = "InvertImageGetSetPixels"
        Me.SplitContainer1.Panel1.ResumeLayout(False)
        Me.SplitContainer1.Panel1.PerformLayout()
        Me.SplitContainer1.Panel2.ResumeLayout(False)
        Me.SplitContainer1.Panel2.PerformLayout()
        Me.SplitContainer1.ResumeLayout(False)
        CType(Me.picSource, System.ComponentModel.ISupportInitialize).EndInit()
        CType(Me.picDest, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)
        Me.PerformLayout()

    End Sub
    Friend WithEvents SplitContainer1 As System.Windows.Forms.SplitContainer
    Friend WithEvents picSource As System.Windows.Forms.PictureBox
    Friend WithEvents picDest As System.Windows.Forms.PictureBox

End Class

' 导入命名空间
Imports System
Imports System.Windows.Forms
Imports System.Collections.Generic
Imports System.ComponentModel
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.Bmp", ImageFormat.Bmp)
   End Sub 

End Class

' 导入命名空间
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

  Public Sub New()
    MyBase.New()

    Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
    Me.ClientSize = New System.Drawing.Size(292, 273)
    Me.Text = "Form1"

  End Sub

  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