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/**
* $Id: mxParallelEdgeLayout.js,v 1.24 2012-03-27 15:03:34 david Exp $
* Copyright (c) 2006-2010, JGraph Ltd
*/
/**
* Class: mxParallelEdgeLayout
*
* Extends <mxGraphLayout> for arranging parallel edges. This layout works
* on edges for all pairs of vertices where there is more than one edge
* connecting the latter.
*
* Example:
*
* (code)
* var layout = new mxParallelEdgeLayout(graph);
* layout.execute(graph.getDefaultParent());
* (end)
*
* Constructor: mxCompactTreeLayout
*
* Constructs a new fast organic layout for the specified graph.
*/
function mxParallelEdgeLayout(graph)
{
mxGraphLayout.call(this, graph);
};
/**
* Extends mxGraphLayout.
*/
mxParallelEdgeLayout.prototype = new mxGraphLayout();
mxParallelEdgeLayout.prototype.constructor = mxParallelEdgeLayout;
/**
* Variable: spacing
*
* Defines the spacing between the parallels. Default is 20.
*/
mxParallelEdgeLayout.prototype.spacing = 20;
/**
* Function: execute
*
* Implements <mxGraphLayout.execute>.
*/
mxParallelEdgeLayout.prototype.execute = function(parent)
{
var lookup = this.findParallels(parent);
this.graph.model.beginUpdate();
try
{
for (var i in lookup)
{
var parallels = lookup[i];
if (parallels.length > 1)
{
this.layout(parallels);
}
}
}
finally
{
this.graph.model.endUpdate();
}
};
/**
* Function: findParallels
*
* Finds the parallel edges in the given parent.
*/
mxParallelEdgeLayout.prototype.findParallels = function(parent)
{
var model = this.graph.getModel();
var lookup = [];
var childCount = model.getChildCount(parent);
for (var i = 0; i < childCount; i++)
{
var child = model.getChildAt(parent, i);
if (!this.isEdgeIgnored(child))
{
var id = this.getEdgeId(child);
if (id != null)
{
if (lookup[id] == null)
{
lookup[id] = [];
}
lookup[id].push(child);
}
}
}
return lookup;
};
/**
* Function: getEdgeId
*
* Returns a unique ID for the given edge. The id is independent of the
* edge direction and is built using the visible terminal of the given
* edge.
*/
mxParallelEdgeLayout.prototype.getEdgeId = function(edge)
{
var view = this.graph.getView();
var state = view.getState(edge);
var src = (state != null) ? state.getVisibleTerminal(true) : view.getVisibleTerminal(edge, true);
var trg = (state != null) ? state.getVisibleTerminal(false) : view.getVisibleTerminal(edge, false);
if (src != null && trg != null)
{
src = mxCellPath.create(src);
trg = mxCellPath.create(trg);
return (src > trg) ? trg+'-'+src : src+'-'+trg;
}
return null;
};
/**
* Function: layout
*
* Lays out the parallel edges in the given array.
*/
mxParallelEdgeLayout.prototype.layout = function(parallels)
{
var edge = parallels[0];
var model = this.graph.getModel();
var src = model.getGeometry(model.getTerminal(edge, true));
var trg = model.getGeometry(model.getTerminal(edge, false));
// Routes multiple loops
if (src == trg)
{
var x0 = src.x + src.width + this.spacing;
var y0 = src.y + src.height / 2;
for (var i = 0; i < parallels.length; i++)
{
this.route(parallels[i], x0, y0);
x0 += this.spacing;
}
}
else if (src != null && trg != null)
{
// Routes parallel edges
var scx = src.x + src.width / 2;
var scy = src.y + src.height / 2;
var tcx = trg.x + trg.width / 2;
var tcy = trg.y + trg.height / 2;
var dx = tcx - scx;
var dy = tcy - scy;
var len = Math.sqrt(dx*dx+dy*dy);
var x0 = scx + dx / 2;
var y0 = scy + dy / 2;
var nx = dy * this.spacing / len;
var ny = dx * this.spacing / len;
x0 += nx * (parallels.length - 1) / 2;
y0 -= ny * (parallels.length - 1) / 2;
for (var i = 0; i < parallels.length; i++)
{
this.route(parallels[i], x0, y0);
x0 -= nx;
y0 += ny;
}
}
};
/**
* Function: route
*
* Routes the given edge via the given point.
*/
mxParallelEdgeLayout.prototype.route = function(edge, x, y)
{
if (this.graph.isCellMovable(edge))
{
this.setEdgePoints(edge, [new mxPoint(x, y)]);
}
};
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