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Normal Topic Rotating the Container Nodes (Read 4146 times)
chiru29
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Rotating the Container Nodes
Aug 17th, 2010 at 9:38am
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Hi Stoyan,

Can i rotate the container nodes by 270 degrees so that the caption will display on left of the node.

Or, is there any way to display the caption of container node on to its left not on top?

Please help me with this.

thanks
Chiru
  
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Stoyo
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Re: Rotating the Container Nodes
Reply #1 - Aug 17th, 2010 at 10:05am
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Hi Chiru,

You will have to override the ContainerNode.Draw method. For an example, check this custom container class:
http://mindfusion.eu/_samples/RoundedContainerNode.cs

The following code draws a rotated caption:
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PointF leftMiddle = new PointF(rect.X, rect.Y + rect.Height / 2);

GraphicsState state = graphics.Save();
graphics.TranslateTransform(-leftMiddle.X, -leftMiddle.Y, MatrixOrder.Append);
graphics.RotateTransform(270, MatrixOrder.Append);
graphics.TranslateTransform(leftMiddle.X, leftMiddle.Y, MatrixOrder.Append);

StringFormat centered = new StringFormat();
centered.Alignment = StringAlignment.Center;
centered.LineAlignment = StringAlignment.Near;
graphics.DrawString(Caption,
	Font, Brushes.Black, leftMiddle, centered);

graphics.Restore(state);


I hope that helps,
Stoyan
  
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chiru29
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Re: Rotating the Container Nodes
Reply #2 - Aug 17th, 2010 at 10:24am
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Hi Stoyan,

Thanks for your reply.

Can you give a sample code, to create a container by calling its Draw() method?

for example, i have a Diagram called diagram.

thanks,
Chiru
  
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Stoyo
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Re: Rotating the Container Nodes
Reply #3 - Aug 17th, 2010 at 10:43am
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Draw() is called automatically by the Diagram when it renders items in the current view. It's where you should add the above code to render rotated captions.

You can add a custom container to the diagram as shown below:

Code
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RoundedContainerNode node = new RoundedContainerNode();
diagram.Nodes.Add(node);


The following enables drawing custom nodes using the mouse:
Code
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diagramView.Behavior = Behavior.Custom;
diagramView.CustomNodeType = typeof(RoundedContainerNode);


I hope that helps,
Stoyan
  
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chiru29
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Re: Rotating the Container Nodes
Reply #4 - Aug 17th, 2010 at 1:29pm
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Thanks Stoyan.

But, there is a problem with the rotated caption while scrolling the diagramview.

I mean (Alt + Mouse Left ad move the mouse).

In this scenario, the caption labels are loosing their positions.

Can you help on this?

thanks
Chiru
  
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Re: Rotating the Container Nodes
Reply #5 - Aug 17th, 2010 at 2:43pm
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Replace the transforms with the following (the default matrix order is Prepend when not specified):

graphics.TranslateTransform(leftMiddle.X, leftMiddle.Y);
graphics.RotateTransform(270);
graphics.TranslateTransform(-leftMiddle.X, -leftMiddle.Y);

This code inserts them before the DiagramView's own transforms and should not depend on the scroll position.
  
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chiru29
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Re: Rotating the Container Nodes
Reply #6 - Aug 17th, 2010 at 2:52pm
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Thanks Stoyan.

This is very helpful.


thanks,
Chiru
  
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