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>GoJS Arrowheads</title>
<meta name="description" content="Show all of the predefined kinds of arrowheads for links, which can be used by setting Shape.toArrow or Shape.fromArrow." />
<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; // for conciseness in defining templates
var myDiagram =
$(go.Diagram, "myDiagramDiv", // create a Diagram for the DIV HTML element
{
isReadOnly: true, // don't allow move or delete
layout: $(go.CircularLayout,
{
radius: 100, // minimum radius
spacing: 0, // circular nodes will touch each other
nodeDiameterFormula: go.CircularLayout.Circular, // assume nodes are circular
startAngle: 270 // first node will be at top
}),
// define a DiagramEvent listener
"LayoutCompleted": function(e) {
// now that the CircularLayout has finished, we know where its center is
var cntr = myDiagram.findNodeForKey("Center");
cntr.location = myDiagram.layout.actualCenter;
}
});
// construct a shared radial gradient brush
var radBrush = $(go.Brush, "Radial", { 0: "#550266", 1: "#80418C" });
// these are the nodes that are in a circle
myDiagram.nodeTemplate =
$(go.Node,
$(go.Shape, "Circle",
{
desiredSize: new go.Size(28, 28),
fill: radBrush, strokeWidth: 0, stroke: null
}), // no outline
{
locationSpot: go.Spot.Center,
click: showArrowInfo, // defined below
toolTip: // define a tooltip for each link that displays its information
$("ToolTip",
$(go.TextBlock, { margin: 4 },
new go.Binding("text", "", infoString).ofObject())
)
}
);
// use a special template for the center node
myDiagram.nodeTemplateMap.add("Center",
$(go.Node, "Spot",
{
selectable: false,
isLayoutPositioned: false, // the Diagram.layout will not position this node
locationSpot: go.Spot.Center
},
$(go.Shape, "Circle",
{ fill: radBrush, strokeWidth: 0, stroke: null, desiredSize: new go.Size(200, 200) }), // no outline
$(go.TextBlock, "Arrowheads",
{ margin: 1, stroke: "white", font: "bold 14px sans-serif" })
));
// all Links have both "toArrow" and "fromArrow" Shapes,
// where both arrow properties are data bound
myDiagram.linkTemplate =
$(go.Link, // the whole link panel
{ routing: go.Link.Normal },
$(go.Shape, // the link shape
// the first element is assumed to be main element: as if isPanelMain were true
{ stroke: "gray", strokeWidth: 2 }),
$(go.Shape, // the "from" arrowhead
new go.Binding("fromArrow", "fromArrow"),
{ scale: 2, fill: "#D4B52C" }),
$(go.Shape, // the "to" arrowhead
new go.Binding("toArrow", "toArrow"),
{ scale: 2, fill: "#D4B52C" }),
{
click: showArrowInfo,
toolTip: // define a tooltip for each link that displays its information
$("ToolTip",
$(go.TextBlock, { margin: 4 },
new go.Binding("text", "", infoString).ofObject())
)
}
);
// collect all of the predefined arrowhead names
var arrowheads = go.Shape.getArrowheadGeometries().toKeySet().toArray();
if (arrowheads.length % 2 === 1) arrowheads.push(""); // make sure there's an even number
// create all of the link data, two arrowheads per link
var linkdata = [];
var i = 0;
for (var j = 0; j < arrowheads.length; j = j + 2) {
linkdata.push({ from: "Center", to: i++, toArrow: arrowheads[j], fromArrow: arrowheads[j + 1] });
}
myDiagram.model =
$(go.GraphLinksModel,
{ // this gets copied automatically when there's a link data reference to a new node key
// and is then added to the nodeDataArray
archetypeNodeData: {},
// the node array starts with just the special Center node
nodeDataArray: [{ category: "Center", key: "Center" }],
// the link array was created above
linkDataArray: linkdata
});
}
// a conversion function used to get arrowhead information for a Part
function infoString(obj) {
var part = obj.part;
if (part instanceof go.Adornment) part = part.adornedPart;
var msg = "";
if (part instanceof go.Link) {
var link = part;
msg = "toArrow: " + link.data.toArrow + ";\nfromArrow: " + link.data.fromArrow;
} else if (part instanceof go.Node) {
var node = part;
var link = node.linksConnected.first();
msg = "toArrow: " + link.data.toArrow + ";\nfromArrow: " + link.data.fromArrow;
}
return msg;
}
// a GraphObject.click event handler to show arrowhead information
function showArrowInfo(e, obj) {
var msg = infoString(obj);
if (msg) {
var status = document.getElementById("myArrowheadInfo");
if (status) status.textContent = msg;
}
}
</script>
</head>
<body onload="init()">
<div id="sample">
<!-- The DIV for the Diagram needs an explicit size or else we won't see anything.
Also add a border to help see the edges. -->
<div id="myDiagramDiv" style="border: solid 1px black; width:600px; height:500px"></div>
<div id="myArrowheadInfo" style="color:red"></div>
<p>
This sample displays all predefined GoJS arrowheads.
Select or hover over a Node or its Link to see the names of the arrowheads on the Link.
</p>
<p>
Each Link shows two arrowheads.
The Link template has a Shape whose <a>Shape.toArrow</a> property is bound to an arrowhead name.
A different Shape in the template has its <a>Shape.fromArrow</a> property bound to a different arrowhead name.
Each arrowhead has been scaled up to make it more easily visible.
</p>
<p>
See the definitions of all these arrowheads in the file: <a href="../extensions/Arrowheads.js" target="_blank">Arrowheads.js</a>.
</p>
<p>
For predefined shape geometries, see the <a href="shapes.html">Shapes</a> sample.
</p>
</div>
</body>
</html>