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>Double Tree</title>
<meta name="description" content="Layout of up to four trees in four directions, all sharing a single root." />
<!-- 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">
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 in this function
myDiagram =
$(go.Diagram, "myDiagramDiv", // must be the ID or reference to div
{ initialContentAlignment: go.Spot.Center });
// define all of the gradient brushes
var graygrad = $(go.Brush, "Linear", { 0: "#F5F5F5", 1: "#F1F1F1" });
var bluegrad = $(go.Brush, "Linear", { 0: "#CDDAF0", 1: "#91ADDD" });
var yellowgrad = $(go.Brush, "Linear", { 0: "#FEC901", 1: "#FEA200" });
var lavgrad = $(go.Brush, "Linear", { 0: "#EF9EFA", 1: "#A570AD" });
// define the Node template for non-terminal nodes
myDiagram.nodeTemplate =
$(go.Node, "Auto",
{ isShadowed: true },
// define the node's outer shape
$(go.Shape, "RoundedRectangle",
{ fill: graygrad, stroke: "#D8D8D8" },
new go.Binding("fill", "color")),
// define the node's text
$(go.TextBlock,
{ margin: 5, font: "bold 11px Helvetica, bold Arial, sans-serif" },
new go.Binding("text", "key"))
);
// define the Link template
myDiagram.linkTemplate =
$(go.Link, // the whole link panel
{ selectable: false },
$(go.Shape)); // the link shape
// create the model for the double tree
myDiagram.model = new go.TreeModel([
// these node data are indented but not nested according to the depth in the tree
{ key: "Root", color: lavgrad },
{ key: "Left1", parent: "Root", dir: "left", color: bluegrad },
{ key: "leaf1", parent: "Left1" },
{ key: "leaf2", parent: "Left1" },
{ key: "Left2", parent: "Left1", color: bluegrad },
{ key: "leaf3", parent: "Left2" },
{ key: "leaf4", parent: "Left2" },
{ key: "Right1", parent: "Root", dir: "right", color: yellowgrad },
{ key: "Right2", parent: "Right1", color: yellowgrad },
{ key: "leaf5", parent: "Right2" },
{ key: "leaf6", parent: "Right2" },
{ key: "leaf7", parent: "Right2" },
{ key: "leaf8", parent: "Right1" },
{ key: "leaf9", parent: "Right1" }
]);
doubleTreeLayout(myDiagram);
}
function doubleTreeLayout(diagram) {
// Within this function override the definition of '$' from jQuery:
var $ = go.GraphObject.make; // for conciseness in defining templates
diagram.startTransaction("Double Tree Layout");
// split the nodes and links into two Sets, depending on direction
var leftParts = new go.Set(go.Part);
var rightParts = new go.Set(go.Part);
separatePartsByLayout(diagram, leftParts, rightParts);
// but the ROOT node will be in both collections
// create and perform two TreeLayouts, one in each direction,
// without moving the ROOT node, on the different subsets of nodes and links
var layout1 =
$(go.TreeLayout,
{ angle: 180,
arrangement: go.TreeLayout.ArrangementFixedRoots,
setsPortSpot: false });
var layout2 =
$(go.TreeLayout,
{ angle: 0,
arrangement: go.TreeLayout.ArrangementFixedRoots,
setsPortSpot: false });
layout1.doLayout(leftParts);
layout2.doLayout(rightParts);
diagram.commitTransaction("Double Tree Layout");
}
function separatePartsByLayout(diagram, leftParts, rightParts) {
var root = diagram.findNodeForKey("Root");
if (root === null) return;
// the ROOT node is shared by both subtrees!
leftParts.add(root);
rightParts.add(root);
// look at all of the immediate children of the ROOT node
root.findTreeChildrenNodes().each(function(child) {
// in what direction is this child growing?
var dir = child.data.dir;
var coll = (dir === "left") ? leftParts : rightParts;
// add the whole subtree starting with this child node
coll.addAll(child.findTreeParts());
// and also add the link from the ROOT node to this child node
coll.add(child.findTreeParentLink());
});
}
</script>
</head>
<body onload="init()">
<div id="sample">
<div id="myDiagramDiv" style="background-color: white; border: solid 1px black; width: 100%; height: 500px"></div>
<p>
This sample displays a diagram of two trees sharing a single root node growing in opposite directions.
The immediate child data of the ROOT node have a "dir" property
that describes the direction that subtree should grow.
</p>
<p>
Unlike many <b>GoJS</b> apps, there is no <a>Diagram.layout</a> assigned.
Layouts are performed in code -- a separate <a>TreeLayout</a> for each subtree.
Each tree layout works on a subset of the nodes.
The <b>separatePartsByLayout</b> function produces two separate collections of Nodes and Links,
one for each direction, and thus one for each tree layout.
</p>
</div>
</body>
</html>