markgojs
Version:
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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HTML
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Interactive Force Directed Layout</title>
<meta name="description" content="A continuously operating ForceDirectedLayout lets the user push and pull nodes around." />
<!-- Copyright 1998-2019 by Northwoods Software Corporation. -->
<meta charset="UTF-8">
<script src="../release/go.js"></script>
<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
<script id="code">
// This variation on ForceDirectedLayout does not move any selected Nodes
// but does move all other nodes (vertexes).
function ContinuousForceDirectedLayout() {
go.ForceDirectedLayout.call(this);
this._isObserving = false;
}
go.Diagram.inherit(ContinuousForceDirectedLayout, go.ForceDirectedLayout);
/** @override */
ContinuousForceDirectedLayout.prototype.isFixed = function(v) {
return v.node.isSelected;
}
// optimization: reuse the ForceDirectedNetwork rather than re-create it each time
/** @override */
ContinuousForceDirectedLayout.prototype.doLayout = function(coll) {
if (!this._isObserving) {
this._isObserving = true;
// cacheing the network means we need to recreate it if nodes or links have been added or removed or relinked,
// so we need to track structural model changes to discard the saved network.
var lay = this;
this.diagram.addModelChangedListener(function (e) {
// modelChanges include a few cases that we don't actually care about, such as
// "nodeCategory" or "linkToPortId", but we'll go ahead and recreate the network anyway.
// Also clear the network when replacing the model.
if (e.modelChange !== "" ||
(e.change === go.ChangedEvent.Transaction && e.propertyName === "StartingFirstTransaction")) {
lay.network = null;
}
});
}
var net = this.network;
if (net === null) { // the first time, just create the network as normal
this.network = net = this.makeNetwork(coll);
} else { // but on reuse we need to update the LayoutVertex.bounds for selected nodes
this.diagram.nodes.each(function (n) {
var v = net.findVertex(n);
if (v !== null) v.bounds = n.actualBounds;
});
}
// now perform the normal layout
go.ForceDirectedLayout.prototype.doLayout.call(this, coll);
// doLayout normally discards the LayoutNetwork by setting Layout.network to null;
// here we remember it for next time
this.network = net;
}
// end ContinuousForceDirectedLayout
function init() {
if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
var $ = go.GraphObject.make; // for conciseness in defining templates
myDiagram =
$(go.Diagram, "myDiagramDiv", // must name or refer to the DIV HTML element
{
initialAutoScale: go.Diagram.Uniform, // an initial automatic zoom-to-fit
contentAlignment: go.Spot.Center, // align document to the center of the viewport
layout:
$(ContinuousForceDirectedLayout, // automatically spread nodes apart while dragging
{ defaultSpringLength: 30, defaultElectricalCharge: 100 }),
// do an extra layout at the end of a move
"SelectionMoved": function(e) { e.diagram.layout.invalidateLayout(); }
});
// dragging a node invalidates the Diagram.layout, causing a layout during the drag
myDiagram.toolManager.draggingTool.doMouseMove = function() {
go.DraggingTool.prototype.doMouseMove.call(this);
if (this.isActive) { this.diagram.layout.invalidateLayout(); }
}
// define each Node's appearance
myDiagram.nodeTemplate =
$(go.Node, "Auto", // the whole node panel
// define the node's outer shape, which will surround the TextBlock
$(go.Shape, "Circle",
{ fill: "CornflowerBlue", stroke: "black", spot1: new go.Spot(0, 0, 5, 5), spot2: new go.Spot(1, 1, -5, -5) }),
$(go.TextBlock,
{ font: "bold 10pt helvetica, bold arial, sans-serif", textAlign: "center", maxSize: new go.Size(100, NaN) },
new go.Binding("text", "text"))
);
// the rest of this app is the same as samples/conceptMap.html
// replace the default Link template in the linkTemplateMap
myDiagram.linkTemplate =
$(go.Link, // the whole link panel
$(go.Shape, // the link shape
{ stroke: "black" }),
$(go.Shape, // the arrowhead
{ toArrow: "standard", stroke: null }),
$(go.Panel, "Auto",
$(go.Shape, // the label background, which becomes transparent around the edges
{ fill: $(go.Brush, "Radial", { 0: "rgb(240, 240, 240)", 0.3: "rgb(240, 240, 240)", 1: "rgba(240, 240, 240, 0)" }),
stroke: null }),
$(go.TextBlock, // the label text
{ textAlign: "center",
font: "10pt helvetica, arial, sans-serif",
stroke: "#555555",
margin: 4 },
new go.Binding("text", "text"))
)
);
// create the model for the concept map
var nodeDataArray = [
{ key: 1, text: "Concept Maps" },
{ key: 2, text: "Organized Knowledge" },
{ key: 3, text: "Context Dependent" },
{ key: 4, text: "Concepts" },
{ key: 5, text: "Propositions" },
{ key: 6, text: "Associated Feelings or Affect" },
{ key: 7, text: "Perceived Regularities" },
{ key: 8, text: "Labeled" },
{ key: 9, text: "Hierarchically Structured" },
{ key: 10, text: "Effective Teaching" },
{ key: 11, text: "Crosslinks" },
{ key: 12, text: "Effective Learning" },
{ key: 13, text: "Events (Happenings)" },
{ key: 14, text: "Objects (Things)" },
{ key: 15, text: "Symbols" },
{ key: 16, text: "Words" },
{ key: 17, text: "Creativity" },
{ key: 18, text: "Interrelationships" },
{ key: 19, text: "Infants" },
{ key: 20, text: "Different Map Segments" }
];
var linkDataArray = [
{ from: 1, to: 2, text: "represent" },
{ from: 2, to: 3, text: "is" },
{ from: 2, to: 4, text: "is" },
{ from: 2, to: 5, text: "is" },
{ from: 2, to: 6, text: "includes" },
{ from: 2, to: 10, text: "necessary\nfor" },
{ from: 2, to: 12, text: "necessary\nfor" },
{ from: 4, to: 5, text: "combine\nto form" },
{ from: 4, to: 6, text: "include" },
{ from: 4, to: 7, text: "are" },
{ from: 4, to: 8, text: "are" },
{ from: 4, to: 9, text: "are" },
{ from: 5, to: 9, text: "are" },
{ from: 5, to: 11, text: "may be" },
{ from: 7, to: 13, text: "in" },
{ from: 7, to: 14, text: "in" },
{ from: 7, to: 19, text: "begin\nwith" },
{ from: 8, to: 15, text: "with" },
{ from: 8, to: 16, text: "with" },
{ from: 9, to: 17, text: "aids" },
{ from: 11, to: 18, text: "show" },
{ from: 12, to: 19, text: "begins\nwith" },
{ from: 17, to: 18, text: "needed\nto see" },
{ from: 18, to: 20, text: "between" }
];
myDiagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
}
function reload() {
//myDiagram.layout.network = null;
var text = myDiagram.model.toJson();
myDiagram.model = go.Model.fromJson(text);
//myDiagram.layout =
// go.GraphObject.make(ContinuousForceDirectedLayout, // automatically spread nodes apart while dragging
// { defaultSpringLength: 30, defaultElectricalCharge: 100 });
}
</script>
</head>
<body onload="init()">
<div id="sample">
<div id="myDiagramDiv" style="background-color: whitesmoke; border: solid 1px black; width: 100%; height: 700px"></div>
<p>
As you drag a node around, the custom <a>ForceDirectedLayout</a> operates continuously, causing other nodes to be pushed
aside or pulled along.
</p>
<p>
The graph is exactly the same as the <a href="conceptMap.html">Concept Map</a> sample.
But the node template is different, and the layout is different.
</p>
</div>
</body>
</html>