I constantly get graphs (LayeredLayout) where an arrow get routed directly over one another as shown below.

I have experimented with RoutingOptions like CrossingCost and GridSize to no avail. The anchoring is set to reassign and there are many anchor points available.

Does TriggerRerouting happen when overlapping and existing arrow? (Not just crossing which is acceptable, but actually overlapping)

How can I ensure this wont happen?

Thanks (Last question for today too )

I have narrowed this down to an issue with the LayeredLayout XGap property. If I don't set an XGap value then routing is as expected with no overlapping arrows, however If I do set an XGap property the arrows overlap, unless the XGap property is very small.

The following gets routing working:

FlowChart1->RoutingOptions->NodeVicinitySize  = 30;

LayeredLayout1->NodeDistance = 150;

// LayeredLayout1->XGap = 300; // Arrows will overlap
LayeredLayout1->XGap = 90; // Arrows wont overlap (but xgap looks too small)
 

This seems like a bug with XGap as for a nice looking graph I would need a XGap of 300 or so.

sure, complete code is below and I attached a fcx file too. this code snippit has an xgap of 300 which causes the arrow from box 11 to 13 to be placed over the arrow from box 10 to 13 (like the screenshot I posted, my original screenshot had some custom drawing stuff which I removed.).

	this->FlowChart1->UndoDepth         = 0;
	this->FlowChart1->AutoSizeDoc       = true;
	this->FlowChart1->AutoScroll        = true;
	this->FlowChart1->AllowMultiSel     = false;
	this->FlowChart1->ShowShadows       = false;
	this->FlowChart1->KbdActive         = false;
	this->FlowChart1->SelectAfterCreate = false;
	this->FlowChart1->ArrowEndsMovable  = false;
	this->FlowChart1->ArrowSelStyle     = Flowchartlib_tlb::ESelStyle::sstCustom;
	this->FlowChart1->ArrowHead         = Flowchartlib_tlb::EArrowHead::ahTriangle;
	this->FlowChart1->ArrowStyle        = Flowchartlib_tlb::EArrowStyle::asPerpendicular;
	this->FlowChart1->PrpArrowStartOrnt = Flowchartlib_tlb::EPrpStartOrientation::soVertical;
	this->FlowChart1->ArrowSegments     = 2;
	this->FlowChart1->ArrowCrossings    = Flowchartlib_tlb::EArrowCrossings::acStraight;
	this->FlowChart1->FireMouseMove     = true;
	this->FlowChart1->BoxCustomDraw     = Flowchartlib_tlb::ECustomDraw::cdNone;
	this->FlowChart1->BoxSelStyle       = Flowchartlib_tlb::ESelStyle::sstCustom;
	this->FlowChart1->BoxStyle          = Flowchartlib_tlb::EBoxStyle::bsRect;
	this->FlowChart1->Behavior          = Flowchartlib_tlb::EBehavior::bhPanOnly;

	this->AnchorPattern1->AddAnchorPointF(40, 100, false, true, Flowchartlib_tlb::EMarkStyle::msNone, 0x000000FF);
	this->AnchorPattern1->AddAnchorPointF(50, 100, false, true,Flowchartlib_tlb::EMarkStyle::msNone, 0x0000FF00);
	this->AnchorPattern1->AddAnchorPointF(60, 100, false, true,Flowchartlib_tlb::EMarkStyle::msNone, 0x0000FF00);
	this->AnchorPattern1->AddAnchorPointF(40, 0, true, false,Flowchartlib_tlb::EMarkStyle::msNone, 0x0000FF00);
	this->AnchorPattern1->AddAnchorPointF(50, 0, true, false,Flowchartlib_tlb::EMarkStyle::msNone, 0x0000FF00);
	this->AnchorPattern1->AddAnchorPointF(60, 0, true, false,Flowchartlib_tlb::EMarkStyle::msNone, 0x0000FF00);
	this->AnchorPattern1->PatternId = L"AP1";

	this->FlowChart1->RoutingOptions->NodeVicinityCost  = 10;
	this->FlowChart1->RoutingOptions->NodeVicinitySize  = 30;
	this->FlowChart1->RoutingOptions->GridSize          = 30;
	this->FlowChart1->RoutingOptions->TurnCost          = 10;
	this->FlowChart1->RoutingOptions->LengthCost        = 10;
	this->FlowChart1->RoutingOptions->CrossingCost      = 20;
	this->FlowChart1->RoutingOptions->EndOrientation    = Flowchartlib_tlb::EPrpStartOrientation::soVertical;//soVertical;
	this->FlowChart1->RoutingOptions->StartOrientation  = Flowchartlib_tlb::EPrpStartOrientation::soVertical;
	this->FlowChart1->RoutingOptions->TriggerRerouting  = Flowchartlib_tlb::ERerouteArrow::raWhenIntersectNode ;
	this->FlowChart1->RoutingOptions->Anchoring         = Flowchartlib_tlb::EAnchoring::ancReassign;

	this->LayeredLayout1->Orientation             = Flowchartlib_tlb::EOrientation::orVertical;
	this->LayeredLayout1->EnforceLinkFlow         = true;
	this->LayeredLayout1->IgnoreNodeSize          = false;
	this->LayeredLayout1->ArrowAnchoring          = Flowchartlib_tlb::EAnchoring::ancReassign;
	this->LayeredLayout1->NodeDistance            = 150;
	this->LayeredLayout1->LayerDistance           = 100;
	this->LayeredLayout1->StraightenLongLinks     = false;

	this->LayeredLayout1->XGap                    = 300;
	//this->LayeredLayout1->XGap                    = 90;


	this->LayeredLayout1->MultipleGraphsPlacement = EMultipleGraphsPlacement::mgpHorizontal;

	Flowchartlib_tlb::IBoxItem * b[16];

	for (int i = 0; i < 16; i++) {
		int width = 300;
		int height = 100;
		if (i == 0 || i == 4 || i == 8 || i == 7) {
			width = 350;
			height = 300;
		}

		b[i] = this->FlowChart1->CreateBox(0, 0, width, height);

		b[i]->FillColor = clYellow;

		b[i]->Obstacle = true;

		b[i]->set_AnchorPattern( this->AnchorPattern1->GetDefaultInterface() );

		UnicodeString caption;

		caption.printf(L"%d", i);

		b[i]->set_Text(caption.w_str());
	}

	this->FlowChart1->CreateArrow(b[0], b[1]);
	this->FlowChart1->CreateArrow(b[0], b[2]);
	this->FlowChart1->CreateArrow(b[1], b[2]);
	this->FlowChart1->CreateArrow(b[2], b[3]);
	this->FlowChart1->CreateArrow(b[2], b[4]);
	this->FlowChart1->CreateArrow(b[3], b[4]);
	this->FlowChart1->CreateArrow(b[4], b[5]);
	this->FlowChart1->CreateArrow(b[4], b[6]);
	this->FlowChart1->CreateArrow(b[5], b[6]);
	this->FlowChart1->CreateArrow(b[5], b[7]);
	this->FlowChart1->CreateArrow(b[6], b[8]);
	this->FlowChart1->CreateArrow(b[7], b[8]);
	this->FlowChart1->CreateArrow(b[8], b[9]);
	this->FlowChart1->CreateArrow(b[8], b[10]);
	this->FlowChart1->CreateArrow(b[9], b[10]);
	this->FlowChart1->CreateArrow(b[10], b[11]);
	this->FlowChart1->CreateArrow(b[10], b[13]);
	this->FlowChart1->CreateArrow(b[11], b[12]);
	this->FlowChart1->CreateArrow(b[11], b[13]);
	this->FlowChart1->CreateArrow(b[12], b[13]);
	this->FlowChart1->CreateArrow(b[13], b[14]);
	this->FlowChart1->CreateArrow(b[13], b[15]);
	this->FlowChart1->CreateArrow(b[14], b[15]);

	this->FlowChart1->ArrangeDiagram( this->LayeredLayout1->GetDefaultInterface() );

	this->FlowChart1->RouteAllArrows();

	this->FlowChart1->FitDocToObjects( this->FlowChart1->ClientWidth/2 );

	FlowChart1->SaveToFile( L"c:\\users\\test\\desktop\\xgap_bug.fcx", true );