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