troubleshooting Question

Graphics and Bitmap High CPU with VB.net

Avatar of koossa
koossa asked on
Visual Basic.NET
6 Comments1 Solution510 ViewsLast Modified:
I have a picturebox on my Windows form.  Form's windowstate = maximize
Picturebox Dock = fill

Here is my code .

Public Class Form1

  Private Sub PictureBox1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseMove
    Dim MyBmp As Bitmap
    If PictureBox1.Image Is Nothing Then
      MyBmp = New Bitmap(PictureBox1.Width, PictureBox1.Height)
    Else
      MyBmp = New Bitmap(PictureBox1.Image)
    End If
    Dim MyGraphics As Graphics = Graphics.FromImage(MyBmp)
    MyGraphics.SmoothingMode = Drawing2D.SmoothingMode.AntiAlias
    MyGraphics.DrawEllipse(Pens.Blue, e.X - 50, e.Y - 50, 100, 100)
    MyGraphics.Dispose()
    PictureBox1.Image = MyBmp
  End Sub
End Class


When I draw circles on the form using the code above, the drawing gets very sticky and the CPU is rising.

What can I do to make it softer on the resources?

I know I can draw using Graphics.FromHwnd(picturebox1.handle), but when something moves over the form it wipes the drawing on that region.


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