Create an Bitmap and paint on it : Bitmap « 2D Graphics « VB.Net Tutorial






Create an Bitmap and paint on it
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
Imports System.Math

public class CreateBitmap
   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 bm As New Bitmap("yourfile.jpg")

        Dim new_bm As New Bitmap(bm)

        bm.Dispose()

        Dim gr As Graphics = Graphics.FromImage(new_bm)
        gr.DrawEllipse(Pens.White, 0, 0, new_bm.Width - 1, new_bm.Height - 1)
  
        e.Graphics.DrawImage(new_bm,0,0,400,400)
  End Sub
    Private Sub InvertImage(ByVal bm As Bitmap)
        For y As Integer = 0 To bm.Height - 1
            For x As Integer = 0 To bm.Width - 1
                Dim clr As Color = bm.GetPixel(x, y)
                clr = Color.FromArgb(255,255 - clr.R, 255 - clr.G, 255 - clr.B)

                bm.SetPixel(x, y, clr)
            Next x
        Next y
    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








17.67.Bitmap
17.67.1.Create an Bitmap and paint on itCreate an Bitmap and paint on it
17.67.2.Create Bitmap from IconCreate Bitmap from Icon
17.67.3.Set Resolution for BitmapSet Resolution for Bitmap
17.67.4.Set Pixel for BitmapSet Pixel for Bitmap
17.67.5.Make Bitmap transparent