PictureBox Mouse down event : PictureBox « GUI « VB.Net Tutorial






Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms

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

Public Class Form1
    Inherits System.Windows.Forms.Form

    Public Sub New()
        MyBase.New()

        InitializeComponent()

    End Sub

    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
    Private components As System.ComponentModel.IContainer

    Friend WithEvents PictureBox1 As System.Windows.Forms.PictureBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem3 As System.Windows.Forms.MenuItem
    Friend WithEvents OpenFileDialog1 As System.Windows.Forms.OpenFileDialog
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.PictureBox1 = New System.Windows.Forms.PictureBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.Label3 = New System.Windows.Forms.Label
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.MenuItem1 = New System.Windows.Forms.MenuItem
        Me.MenuItem2 = New System.Windows.Forms.MenuItem
        Me.MenuItem3 = New System.Windows.Forms.MenuItem
        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog
        Me.SuspendLayout()
        '
        'PictureBox1
        '
        Me.PictureBox1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.PictureBox1.Dock = System.Windows.Forms.DockStyle.Top
        Me.PictureBox1.Image = Image.FromFile("YourFile.bmp")
        Me.PictureBox1.Location = New System.Drawing.Point(0, 0)
        Me.PictureBox1.Name = "PictureBox1"
        Me.PictureBox1.Size = New System.Drawing.Size(292, 216)
        Me.PictureBox1.TabIndex = 0
        Me.PictureBox1.TabStop = False
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(24, 232)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(56, 24)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "R:"
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(112, 232)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(64, 24)
        Me.Label2.TabIndex = 2
        Me.Label2.Text = "G:"
        '
        'Label3
        '
        Me.Label3.Location = New System.Drawing.Point(208, 232)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(64, 24)
        Me.Label3.TabIndex = 3
        Me.Label3.Text = "B:"
        '
        'MainMenu1
        '
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1})
        '
        'MenuItem1
        '
        Me.MenuItem1.Index = 0
        Me.MenuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem2, Me.MenuItem3})
        Me.MenuItem1.Text = "File"
        '
        'MenuItem2
        '
        Me.MenuItem2.Index = 0
        Me.MenuItem2.Text = "Open"
        '
        'MenuItem3
        '
        Me.MenuItem3.Index = 1
        Me.MenuItem3.Text = "Exit"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 270)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.PictureBox1)
        Me.Menu = Me.MainMenu1
        Me.ResumeLayout(False)

    End Sub

    Dim pic As Bitmap
    Dim c As System.Drawing.Color
    Dim xwidth, yheight As Integer

    Private Sub PictureBox1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown
        pic = PictureBox1.Image
        xwidth = pic.Width
        yheight = pic.Height
        If e.X < xwidth And e.Y < yheight Then
            c = pic.GetPixel(e.X, e.Y)
            Label1.Text = "R:" + c.R.ToString
            Label2.Text = "G:" + c.G.ToString
            Label3.Text = "B:" + c.B.ToString
        End If
    End Sub

    Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2.Click
        OpenFileDialog1.ShowDialog()
        PictureBox1.Image = New Bitmap(OpenFileDialog1.FileName)
    End Sub

    Private Sub MenuItem3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem3.Click
        End
    End Sub
End Class








14.28.PictureBox
14.28.1.PictureBox: StretchImage, CenterImagePictureBox: StretchImage, CenterImage
14.28.2.PictureBox: Save an ImagePictureBox: Save an Image
14.28.3.Load image to PictureBoxLoad image to PictureBox
14.28.4.Using a PictureBox to display imagesUsing a PictureBox to display images
14.28.5.Draw on a PictureBoxDraw on a PictureBox
14.28.6.PictureBox Mouse down event
14.28.7.Get Graphics from PictureBoxGet Graphics from PictureBox
14.28.8.Draw on PictureBox borderDraw on PictureBox border