VB.Net/2D/Bitmap
Содержание
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
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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
- 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
- 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
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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
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