How to stop updating a PictureBox? [modified]

[MichaelCoder]

Hi..., I want to write a zoom function for a PictureBox. Therefore I have to change some values (Left, Top, Width, and Height) of the PictureBox. The PictureBox is redrawn, when I just change one of theses values. So, when I change all 4 values the PictureBox gets flickering and jumping around. How to stop/activate the Redrawing of a PictureBox. This is my code:

private void CalcPictureBox1()
{
  // NEED: deactivate pictureBox, that no changes update PictureBox
  
  int zoomedWidth = (int)(bitmapDepthBuffer.Width \* pBoxZoomFactor);
  int zoomedHeight = (int)(bitmapDepthBuffer.Height \* pBoxZoomFactor);
  if (zoomedWidth > panelDepthBuffer.Width)
  {
    this.pBoxDepthBuffer.Left = 0;
  }
  else
  {
    this.pBoxDepthBuffer.Left = (panelDepthBuffer.Width - zoomedWidth) / 2;
  }
  if (zoomedHeight > panelDepthBuffer.Height)
  {
    this.pBoxDepthBuffer.Top = 0;
  }
  else
  {
    this.pBoxDepthBuffer.Top = (panelDepthBuffer.Height - zoomedHeight) / 2;
  }
  this.pBoxDepthBuffer.Width = zoomedWidth;
  this.pBoxDepthBuffer.Height = zoomedHeight;

  // NEED: activate pictureBox, that changes update PictureBox

}

Thank you in advance, Michael

modified on Friday, June 20, 2008 4:33 PM

[Matthew Butler 0]

To update position and size at the same time, you can use...

.SetBounds(left, top, width, height);

[also: .Scale may be of use] Hope this helps.

Matthew Butler

[MichaelCoder]

Hi Matthew, thank you for the tip, but it didn't help, whyever. The PictureBox on the panel is still jumping around, when I change it with:

this.SetStyle(ControlStyles.DoubleBuffer | ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | ControlStyles.ResizeRedraw, true);

...

pBoxDepthBuffer.SizeMode = PictureBoxSizeMode.Zoom;
panelDepthBuffer.Controls.Add(pBoxDepthBuffer);
panelDepthBuffer.AutoScroll = true;

...

this.pBoxDepthBuffer.SetBounds(newLeft, newTop, zoomedWidth, zoomedHeight);

I've also changed the Style of the Form with this.SetStyle to DoubleBuffering. Nothing helped. Do you have any further ideas? Thanks, Michael

[MichaelCoder]

Hi..., I have tried this rude method by setting the image first to null, changing the Bounds and initialalizing the image again:

  this.pBoxDepthBuffer.Image = null;
  this.pBoxDepthBuffer.SetBounds(newLeft, newTop, zoomedWidth, zoomedHeight);
  this.pBoxDepthBuffer.Image = bitmapDepthBuffer;

This works now for me. Thank you, Michael

[Christian Graus]

I would never bother with a picture box, I'd just draw the bitmap myself.

Christian Graus Please read this if you don't understand the answer I've given you "also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )