Performance, or Bitmap Correction due to speed?

If when I Initialize the bitmap object to a new image, I also use the following code:

Dim g As Graphics = bmvMain.Bitmap.GetGdiplusGraphics
g.DrawLine(Pens.White, 0, 80, 15, 100)
g.DrawLine(Pens.White, 15, 100, 18, 76)

I see two connected lines on my bitmap... however when the same values are drawn from within a loop, I get one or maybe two pixels of the first line, and nothing else after that. In addition, it seems the bitmap class stops responding to subsequent draw commands.

If I simply add the points to an array, and then use:

g.DrawLines(Pens.White, aryPoints)

I see all the points just fine. Also, substituting g.DrawLine with bmvMain.Bitmap.SetPixel also draws the first 1 or two pixels and then stops responding.

The only thing I can think of that's different from my code in the loop and the initializing code where I draw two subsequent lines is in the loop (where the calls seem to fail) I subsequently call Thread.Sleep before the next iteration of the loop.

Any help would be greatly appreciated :)

While I could use the scenario where I load an array as I go, which I'm currently doing as a work around... I would much rather this work properly since I'm intending to show the points and lines being drawn in real time.

Edited by user Sunday, December 23, 2007 5:08:21 PM(UTC)  | Reason: Not specified

GDI+ has some more advantage regarding to GDI, for example it handles alpha channel in images. But performance in GDI+ is less than in GDI. If your requirements on features are satisfied by GDI, I recommend you to use it.