Zoom in out issue

GoDiagram (6 and previous)
1

When I import an image as the background and zoom out the graph, the background image doesn’t stretch to fit the graph area.

2

GoDiagram does not support .NET the Control.BackgroundImageLayout property.

You should add the image to the GoView.BackgroundLayer and then manage events to size it:

    GoImage bg = new GoImage();
    bg.Name = "world.jpg";        
    // comment out next 2 lines if you want real size of image. (and goview1_resize event handler)
    bg.Bounds = goView1.DocExtent;
    RectangleF rf = goView1.DocExtent;
    //bg.Bounds = new RectangleF(rf.X, rf.Y, 2048, 2048);   // or make it really big
    goView1.BackgroundLayer.Add(bg);

then handle the DocScale PropertyChanged event on the GoView:

private void goView1_PropertyChanged(object sender, PropertyChangedEventArgs e) {
  if (e.PropertyName == "DocScale") {
    foreach (GoObject o in goView1.BackgroundLayer) {
      GoImage im = o as GoImage;
      if (im != null) im.Bounds = goView1.DocExtent;
    }       
  }
}

and the Resize event if you want to:

private void goView1_Resize(object sender, EventArgs e)
{
  foreach (GoObject o in goView1.BackgroundLayer) {
    GoImage im = o as GoImage;
    if (im != null) im.Bounds = goView1.DocExtent;
  }
}
3

Thanks very much. It’s works fine