gojs
Version:
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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HTML
<html>
<head>
<meta charset="UTF-8">
<title>Multi-Arrow Links</title>
<meta name="description" content="A custom Link geometry that draws arrowheads at the end of each segment of orthogonally routed links." />
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Copyright 1998-2020 by Northwoods Software Corporation. -->
<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;
myDiagram =
$(go.Diagram, "myDiagramDiv", // the ID of the DIV HTML element
{
layout: $(go.ForceDirectedLayout),
"undoManager.isEnabled": true
});
myDiagram.nodeTemplate =
$(go.Node, go.Panel.Auto,
{ locationSpot: go.Spot.Center },
$(go.Shape,
{
figure: "RoundedRectangle",
parameter1: 10,
fill: "orange", // default fill color
portId: "",
fromLinkable: true,
fromSpot: go.Spot.AllSides,
toLinkable: true,
toSpot: go.Spot.AllSides,
cursor: "pointer"
},
new go.Binding("fill", "color")),
$(go.TextBlock,
{ margin: 10, font: "bold 12pt sans-serif" },
new go.Binding("text"))
);
myDiagram.linkTemplate =
$(MultiArrowLink, // subclass of Link, defined below
{
relinkableFrom: true,
relinkableTo: true,
reshapable: true,
resegmentable: true
},
$(go.Shape,
{ isPanelMain: true },
new go.Binding("fill", "color"))
// no arrowhead is defined here -- they are hard-coded in MultiArrowLink.makeGeometry
);
// create a few nodes and links
myDiagram.model = new go.GraphLinksModel([
{ key: 1, text: "one", color: "lightyellow" },
{ key: 2, text: "two", color: "brown" },
{ key: 3, text: "three", color: "green" },
{ key: 4, text: "four", color: "slateblue" },
{ key: 5, text: "five", color: "aquamarine" },
{ key: 6, text: "six", color: "lightgreen" },
{ key: 7, text: "seven" }
], [
{ from: 5, to: 6, color: "orange" },
{ from: 1, to: 2, color: "red" },
{ from: 1, to: 3, color: "blue" },
{ from: 1, to: 4, color: "goldenrod" },
{ from: 2, to: 5, color: "fuchsia" },
{ from: 3, to: 5, color: "green" },
{ from: 4, to: 5, color: "black" },
{ from: 6, to: 7 }
]);
}
// Produce a Geometry that includes an arrowhead at the end of each segment.
// This only works with orthogonal non-Bezier routing.
function MultiArrowLink() {
go.Link.call(this);
this.routing = go.Link.Orthogonal;
}
go.Diagram.inherit(MultiArrowLink, go.Link);
// produce a Geometry from the Link's route
MultiArrowLink.prototype.makeGeometry = function() {
// get the Geometry created by the standard behavior
var geo = go.Link.prototype.makeGeometry.call(this);
if (geo.type !== go.Geometry.Path || geo.figures.length === 0) return geo;
var mainfig = geo.figures.elt(0); // assume there's just one PathFigure
var mainsegs = mainfig.segments;
var arrowLen = 8; // length for each arrowhead
var arrowWid = 3; // actually half-width of each arrowhead
var fx = mainfig.startX;
var fy = mainfig.startY;
for (var i = 0; i < mainsegs.length; i++) {
var a = mainsegs.elt(i);
// assume each arrowhead is a simple triangle
var ax = a.endX;
var ay = a.endY;
var bx = ax;
var by = ay;
var cx = ax;
var cy = ay;
if (fx < ax - arrowLen) {
bx -= arrowLen; by += arrowWid;
cx -= arrowLen; cy -= arrowWid;
} else if (fx > ax + arrowLen) {
bx += arrowLen; by += arrowWid;
cx += arrowLen; cy -= arrowWid;
} else if (fy < ay - arrowLen) {
bx -= arrowWid; by -= arrowLen;
cx += arrowWid; cy -= arrowLen;
} else if (fy > ay + arrowLen) {
bx -= arrowWid; by += arrowLen;
cx += arrowWid; cy += arrowLen;
}
geo.add(new go.PathFigure(ax, ay, true)
.add(new go.PathSegment(go.PathSegment.Line, bx, by))
.add(new go.PathSegment(go.PathSegment.Line, cx, cy).close()));
fx = ax;
fy = ay;
}
return geo;
};
</script>
</head>
<body onload="init()">
<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:700px; min-width: 200px"></div>
<p>
This sample demonstrates customization of the <a>Link</a> <a>Shape</a>'s <a>Geometry</a>.
</p>
<p>
The MultiArrowLink class in this sample inherits from Link and overrides the <a>Link.makeGeometry</a> method
to add arrowheads at the end of each interior segment, assuming that the route is orthogonal.
</p>
</div>
</body>
</html>