Hi,

Can you suggest me how to achieve following:

1) Magnifier Effect - Say we will be having a magnifier button in the toolbar clicking on that will change the diagram cursor (to +) and now if you draw a square on the diagram that area should then be displayed in center of the diagram with proper zooming.

Can anybody suggest the steps to achieve this.

2) We have a group of nodes all with Y values say 400 but when the application loads the user sees only diagram area with height (Y) 0 to 200 and thus has to scroll down to see the group so he may get a feeling that there is no node present on the diagram.
So we want whenever the diagram loads the diagram should adjust its coordinates according to diagram element position.
And we do not want diagram to resize as in ResizeToFitItems().

So what should be done here.

Thanks in advance,
Anurodh

Hi Stoyo,

Thanks for the reply.

for 1) Thanks your solution is working fine for magnifier but on few things we need your help

a) Clientarea that is magnifief should be displayed in the center of the diagram.
b) The rectangle that is displaying the area to zoom should be dashed line.
c) Want to change cursor to + sign when in magnify mode but the code is not working.

The code is:

public bool ZoomToRect
{
   get { return zoomToRect;}
   set {
zoomToRect= value;
if (zoomToRect)
{
      diagram.Behavior = Behavior.DrawShapes;
      diagram.Cursor = Cursors.Cross;
  }
     }
}

void diagram_NodeCreated(object sender, NodeEventArgs e)

{
ShapeNode node = e.Node as ShapeNode;
if (zoomToRect && node != null)
{
diagram.ZoomToRect(node.Bounds);
diagram.Nodes.Remove(node);
zoomToRect= false;
diagram.Behavior = Behavior.Modify;
    diagram.Cursor = Cursors.Arrow;
}
}


void diagram_InitializeNode(object sender, NodeEventArgs e)

{
ShapeNode node = e.Node as ShapeNode;
if (zoomToRect && node != null)
{
node.Shape = Shapes.Rectangle;
node.Pen = new Pen(Brushes.Black, 2);
node.Brush = new SolidColorBrush(Colors.Transparent);
node.Text = "select the area to zoom to";
}
}


for 2) i tried following code:

Rect rect = diagram.GetContentBounds(false, false);
diagram.ScrollTo(rect.TopLeft);

and on diagram we have nodes:
1) Node1 - (200, -80),
2) Node2 - (100, -40) and
3) Node3 - (400, 100).

Node2 and Node3 are linked.

But with above code also we are not able to see Node1 completely and Node2 is getting clipped off.
As earlier. please suggest what i am missing here.

Thanks,
Anurodh

No, i am getting:
rect.TopLeft :{81.4409448818898,-88.5590551181102}
I am also following attached node method, but i don't think it will make any difference.

Thanks,
Anurodh

have you tried this?
http://mindfusion.eu/Forum/YaBB.pl?board=wpfdg_disc;action=display;num=123686325...

Hi,

The magnifier code as suggested in this link is working fine. However i have following requirements to meet of which the first one is very important.

1) Calling zoomtorect should never get the diagram zoomfactor to more than 200.
After calling zoomtorect if i place a constraint that if zoomfactor>200 then zoomfactor=200 is getting the selected area out of view.
How should we modify our magnifier code (presented above in the thread) to do this?

2) Additional requirements:
a) Clientarea that is magnified should be displayed in the center of the diagram.
b) The rectangle that is displaying the area to zoom should be dashed line.

Thanks,
Anurodh

Thanks for the reply.

Please explain, how to find the ratio and apply it to the rectangle.

diagram.ZoomToRect(node.Bounds);

if (diagram.ZoomFactor > 200)
{
// What to do here
}

Thanks,
Anurodh

Try this

diagram.ZoomToRect(r);

if (diagram.ZoomFactor > 200)
{
	Point ctPt = new Point(r.X + r.Width / 2, r.Y + r.Height / 2);
	if (diagram.Bounds.X < 0)
		ctPt.X += diagram.Bounds.X / 2;
	if (diagram.Bounds.Y < 0)
		ctPt.Y += diagram.Bounds.Y / 2;

	diagram.ZoomFactor = 200;

	Point size = diagram.ClientToDoc(new Point(scrollViewer.ViewportWidth, scrollViewer.ViewportHeight));
	Point newPt = new Point(ctPt.X - size.X / 2, ctPt.Y - size.Y / 2);

	if (newPt.X < 0)
		newPt.X = 0;
	if (newPt.Y < 0)
		newPt.Y = 0;

	diagram.ScrollTo(newPt);
}
 

I hope that helps,
Stoyan