Dear Stoyo, several questions

1) Layout/Fit/Undo note

Step1. Spring layout operation of test diagram
SpringLayout layout = new SpringLayout();
layout.Arrange(this.diagram1);

Step2. Fit its bounds.
this.diagram1.ResizeToFitItems(1);

Step3. [Undo] operation
this.diagram1.UndoManager.Undo();

initial layout restored, fit operation not stored in command history stack.
How to remember fit operation in command history stack?

2) I found that it is possible to set diagramView zoom bounds (ZoomToRect function) but not found a way to get current «zoom rectangle». If such function exists, please point me to it. If not, is it possible to include something similar in the future?

3) See picture below. With big pen width and arrowhead diagramLink rendered as lower picture. Is it possible to render link with head as upper picture?


4) See picture below. After diagram saving to binary with wmf pictures in nodes (diagram.savetofile) and reopening it (diagram.loadfromfile) wmf pictures in shape nodes renders like bmp.


5) picture below. ZoomFactor zooms picture relatively upper left point of zoom area (black lines on picture). Is it possible for zooming relatively center of zoom area (red lines)?


6) picture below. Is it possible to get building functionality for zooming similar multiple selection? I mean selecting zooming area by mouse, with following zooming diagram to this rectangle (see Zoom Tool (magnifier) in Adobe Photoshop, for example). I think itis very handy function.


Best
Vlad

Stoyan, thanks for answer.

Concerning image restoration after saving/loading diagram (question 4 in first post) I found the same behaviour in case of copy/past operations through diagramView.CopyToClipBoard/diagramView.PasteFromClipboard tools

Best
Vlad

4. happens because the control calls Image.SaveToStream when saving images, but the framework does not provide a metafile encoder and falls back to PngEndoder. You can verify that like this:

new Metafile("test1.emf").Save("test2.emf");

Now if you open test2 with the VS binary editor, it will have the PNG header. As a work-around you could override the SaveTo and LoadFrom methods of nodes to save the file path to the WMF images, and then load the original images from LoadFrom.

1) As you've noticed resizing the diagram is not subject to undo/redo. To enable undo/redo, you can use the following custom command:

class ResizeToFitCommand : Command
{
	public ResizeToFitCommand(Diagram diagram)
		: base("Resize")
	{
		this.diagram = diagram;
	}

	protected override void Execute(bool undoEnabled)
	{
		bounds = diagram.Bounds;

		diagram.ResizeToFitItems(1);
	}

	protected override void Undo()
	{
		diagram.Bounds = bounds;
	}

	protected override void Redo()
	{
		Execute(true);
	}


	private Diagram diagram;
	private RectangleF bounds;
} 

Then, modify your code as follows:

CompositeCmd composite = diagram1.UndoManager.StartComposite("Arrange and resize");

SpringLayout l = new SpringLayout();
l.Arrange(diagram1);
diagram1.ExecuteCommand(new ResizeToFitCommand(diagram1));

composite.Execute(); 

2) To get the current viewport expressed in document coordinates, use the following code:

RectangleF viewport = diagramView1.ClientToDoc(diagramView1.ClientRectangle); 

I am assuming that diagramView1 is the DiagramView containing the respective diagram.

Let me know if this helps.

Regards,
Meppy