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mbuechler
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Arrows lieing over each other
Nov 11th, 2009 at 10:57am
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hi.

I use the LayeredLayout Engine in my flowchart. the problem I have is, that when there are two boxes connected by 2 arrows (one from box A to B and one from B to A) these arrows are lieing over each other. In my app it is neccesary that you can select each arrow... is it possible to set a property which avoid this overlieing arrows.
I hope its clear what i mean Wink

thank for all help.
  
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Stoyo
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Re: Arrows lieing over each other
Reply #1 - Nov 11th, 2009 at 12:34pm
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Hi,

There is no built-in property to do that. You might call this method to split the links (assuming vertical layout):

Code
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void SplitLinksIgnoreDirection(float padding)
{
	// find repeating links
	Dictionary<int, List<DiagramLink>> repeatingLinks = new Dictionary<int, List<DiagramLink>>();
	foreach (DiagramLink link in diagram.Links)
	{
		int z1 = Math.Min(link.Origin.ZIndex, link.Destination.ZIndex);
		int z2 = Math.Max(link.Origin.ZIndex, link.Destination.ZIndex);
		int key = diagram.Items.Count * z1 + z2;
		if (!repeatingLinks.ContainsKey(key))
			repeatingLinks[key] = new List<DiagramLink>();
		repeatingLinks[key].Add(link);
	}

	// pull them apart
	foreach (KeyValuePair<int, List<DiagramLink>> linkList in repeatingLinks)
	{
		int c = 0, numLinks = linkList.Value.Count;
		if (numLinks < 2)
			continue;
		foreach (DiagramLink link in linkList.Value)
		{
			for (int p = 0; p < link.ControlPoints.Count; ++p)
			{
				PointF point = link.ControlPoints[p];
				point.X += padding * c - padding * (numLinks - 1) / 2;
				link.ControlPoints[p] = point;
				link.UpdateFromPoints();
			}
			c++;
		}
	}
}


I hope that helps,
Stoyan
  
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mbuechler
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Re: Arrows lieing over each other
Reply #2 - Nov 11th, 2009 at 1:22pm
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Thanks for this...
can you tell me what i have to change when i use horizontal layout? the user can change this in the app...

another point: when I move one of the boxes where the splitaction was performed for, the arrows are lieing over each other again. is there a way to prevent this? Or do I only have to call this function after moving an object on the flowchart?
  
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Stoyo
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Re: Arrows lieing over each other
Reply #3 - Nov 11th, 2009 at 2:14pm
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For horizontal layouts add to point.Y, and disable the Dynamic property of links to prevent them from returning to the middle of the node borders.

I hope that helps,
Stoyan
  
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mbuechler
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Re: Arrows lieing over each other
Reply #4 - Nov 16th, 2009 at 9:12am
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thanks. the function works good.
the only change i made was the decision when to move it along the x or the y axis.
i calculate the delta X and delta Y of first and last point in ControlPointcollection.
if deltaX > deltaY -> move vertical
if deltaX < deltaY -> move horizontal.
so i dont have to look at the orientation of my layout engine and the seperation of the arrows also work if someone pull the states on the flowchart.

maybe you can tell me another thing: if there is a transition which has its beginning and its end on the same box, the transition isn't visible after applieing layered layout engine.
does someone has a solution for this?
  
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Stoyo
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Re: Arrows lieing over each other
Reply #5 - Nov 16th, 2009 at 11:09am
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You could run this code for self-loop links after applying the layout:

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if (link.Origin == link.Destination)
{
	RectangleF r = link.Origin.Bounds;
	PointF p = new PointF(r.X + 10, r.Y);
	link.Style = LinkStyle.Bezier;
	link.SegmentCount = 1;
	link.ControlPoints.Clear();
	link.ControlPoints.Add(p);
	link.ControlPoints.Add(new PointF(p.X - 8, p.Y - 12));
	link.ControlPoints.Add(new PointF(p.X + 10, p.Y - 12));
	link.ControlPoints.Add(new PointF(p.X + 2, p.Y));
	link.UpdateFromPoints();
}


I hope that helps,
Stoyan
  
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mbuechler
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Re: Arrows lieing over each other
Reply #6 - Nov 17th, 2009 at 9:02am
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thank you very much. you helped my very much....
  
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nejelski
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Re: Arrows lieing over each other
Reply #7 - Apr 8th, 2010 at 9:31pm
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Hi Stoyo,
Do you have a C++ version of "SplitLinksIgnoreDirection" function that splits arrow items?
Or may be there is a new way to split overlaying arrows between the same box items?

I use FlowChartPro ActiveX with MFC wrappers.

Thanks a lot,
  
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Stoyo
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Re: Arrows lieing over each other
Reply #8 - Apr 9th, 2010 at 9:20am
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Hi,

For FlowchartX with MFC it should look like

Code
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void SplitLinksIgnoreDirection(FlowChart& diagram, int padding)
{
	// find repeating links
	std::map<int, std::vector<LPDISPATCH> > repeatingLinks;
	for (int i = 0; i < diagram.GetArrows().GetCount(); ++i)
	{
		ArrowItem link = diagram.GetArrows().GetItem(i);
		int z1 = min(link.GetOriginBox().GetZIndex(), link.GetDestinationBox().GetZIndex());
		int z2 = max(link.GetOriginBox().GetZIndex(), link.GetDestinationBox().GetZIndex());
		int key = (diagram.GetArrows().GetCount() + diagram.GetBoxes().GetCount()) * z1 + z2;
		repeatingLinks[key].push_back(link.m_lpDispatch);
	}

	// pull them apart
	for (std::map<int, std::vector<LPDISPATCH> >::iterator mi = repeatingLinks.begin();
		mi != repeatingLinks.end(); ++mi)
	{
		size_t c = 0, numLinks = mi->second.size();
		if (numLinks < 2)
			continue;
		for (size_t l = 0; l < mi->second.size(); ++l)
		{
			ArrowItem link; link.AttachDispatch(mi->second[l], FALSE);
			for (int p = 0; p < link.GetCtrlPtCount(); ++p)
			{
				int x = link.GetCtrlPtX(p);
				x += padding * c - padding * (numLinks - 1) / 2;
				link.SetCtrlPtX(p, x);
				link.Update();
			}
			c++;
		}
	}
}


This code assumes the links are initially vertical and connected to the center of node sides.

I hope that helps,
Stoyan
  
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nejelski
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Re: Arrows lieing over each other
Reply #9 - Apr 9th, 2010 at 5:20pm
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Works great!
Great function to start with.
I will take care of the rest.
I am Very impressed with FAST technical support!
Good job!
Thanks a lot.

Just in case : for  those who would use it too. Add the following lines before function declaration to get rid of different errors:

#include <map>
#include <vector>
using namespace std;

#ifdef _DEBUG
#define new DEBUG_NEW
#endif
  
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