create-gojs-kit
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A CLI for downloading GoJS samples, extensions, and docs
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<meta name="description" content="Let the user draw a new link by clicking consecutive points through which the link's route must pass." />
<meta itemprop="description" content="Let the user draw a new link by clicking consecutive points through which the link's route must pass." />
<meta property="og:description" content="Let the user draw a new link by clicking consecutive points through which the link's route must pass." />
<meta name="twitter:description" content="Let the user draw a new link by clicking consecutive points through which the link's route must pass." />
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<title>
Linking Via Repeated Clicks to Determine Path of New Link | GoJS Diagramming Library
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<body>
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GoJS
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<script>
window.addEventListener("DOMContentLoaded", function () {
// topnav
var topButton = document.getElementById("topnavButton");
var topnavList = document.getElementById("topnavList");
if (topButton && topnavList) {
topButton.addEventListener("click", function (e) {
topnavList
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e.stopPropagation();
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document.addEventListener("click", function (e) {
// if the clicked element isn't the list, close the list
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<div class="flex flex-col prose">
<div class="w-full max-w-screen-xl mx-auto">
<!-- * * * * * * * * * * * * * -->
<!-- Start of GoJS sample code -->
<script src="https://cdn.jsdelivr.net/npm/gojs@3.1.0"></script>
<div id="allSampleContent" class="p-4 w-full">
<script src="../extensions/PolylineLinkingTool.js"></script>
<script id="code">
function init() {
myDiagram = new go.Diagram('myDiagramDiv', {
// install custom linking tool, defined in PolylineLinkingTool.js
linkingTool: new PolylineLinkingTool(),
'undoManager.isEnabled': true
});
myDiagram.nodeTemplate =
new go.Node('Spot', { locationSpot: go.Spot.Center })
.bindTwoWay('location', 'loc', go.Point.parse, go.Point.stringify)
.add(
new go.Shape({
width: 100,
height: 100,
fill: 'lightgray',
portId: '',
cursor: 'pointer',
fromLinkable: true,
fromLinkableSelfNode: true,
fromLinkableDuplicates: true, // optional
toLinkable: true,
toLinkableSelfNode: true,
toLinkableDuplicates: true // optional
})
.bind('fill'),
new go.Shape({ width: 70, height: 70, fill: 'transparent', stroke: null }),
new go.TextBlock()
.bind('text')
);
myDiagram.linkTemplate =
new go.Link({
reshapable: true, resegmentable: true,
adjusting: go.LinkAdjusting.Stretch // optional
})
.bindTwoWay('points', 'points')
.add(
new go.Shape({ strokeWidth: 1.5 }),
new go.Shape({ toArrow: 'OpenTriangle' })
);
load(); // load a simple diagram from the textarea
}
// Show the diagram's model in JSON format
function save() {
document.getElementById('mySavedModel').value = myDiagram.model.toJson();
myDiagram.isModified = false;
}
function load() {
myDiagram.model = go.Model.fromJson(document.getElementById('mySavedModel').value);
}
window.addEventListener('DOMContentLoaded', init);
</script>
<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; width: 100%; height: 500px"></div>
<div id="buttons">
<button onclick="save()">Save</button>
<button onclick="load()">Load</button>
</div>
<p>
This sample demonstrates the PolylineLinkingTool, which replaces the standard LinkingTool. The tool is defined in its own file, as
<a href="../extensions/PolylineLinkingTool.js">PolylineLinkingTool.js</a>.
</p>
<p>
The user starts drawing a new link from a node in the normal manner, by dragging from a port, which for feedback purposes has a "pointer" cursor. Normally
the user would have to release the mouse near the target port/node. However with the PolylineLinkingTool the user may click at various points to cause the
new link to be routed along those points. Clicking on the target port completes the new link. Press <b>Escape</b> to cancel, or <b>Z</b> to remove the last
point.
</p>
<p>
Furthermore, because <a>Link.resegmentable</a> is true, the user can easily add or remove segments from the route of a selected link. To insert a segment,
the user can start dragging the small diamond resegmenting handle. To remove a segment, the user needs to move a regular reshaping handle to cause the
adjacent two segments to be in a straight line.
</p>
<p>
The PolylineLinkingTool also works with orthogonally routed links. To demonstrate this, uncomment the two lines that initialize <a>Link.routing</a> to be
<a>Routing.Orthogonal</a>.
</p>
<textarea id="mySavedModel" style="width: 100%; height: 300px">
{ "class": "go.GraphLinksModel",
"pointsDigits": 1,
"nodeDataArray": [
{ "key": 1, "text": "Node 1", "fill": "blueviolet", "loc": "100 100" },
{ "key": 2, "text": "Node 2", "fill": "orange", "loc": "400 100" }
],
"linkDataArray": [ ]
}
</textarea>
</div>
</div>
<!-- * * * * * * * * * * * * * -->
<!-- End of GoJS sample code -->
</div>
<div id="allTagDescriptions" class="p-4 w-full max-w-screen-xl mx-auto">
<hr/>
<h3 class="text-xl">GoJS Features in this sample</h3>
<!-- blacklist tags that do not correspond to a specific GoJS feature -->
<h4>Links</h4>
<p>
The <a href="../api/symbols/Link.html" target="api">Link</a> class is used to implement a visual relationship between nodes.
Links are normally created by the presence of link data objects in the <a href="../api/symbols/GraphLinksModel.html#linkDataArray" target="api">GraphLinksModel.linkDataArray</a>
or by a parent key reference as the value of the <a href="../api/symbols/TreeModel.html#nodeParentKeyProperty" target="api">TreeModel.nodeParentKeyProperty</a> of a node data object
in a <a href="../api/symbols/TreeModel.html" target="api">TreeModel</a>.
More information can be found in the <a href="../intro/links.html">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#links">Related samples</a>
</p>
<hr>
<!-- blacklist tags that do not correspond to a specific GoJS feature -->
<h4>Tools</h4>
<p>
<a href="../api/symbols/Tool.html" target="api">Tool</a>s handle all input events, such as mouse and keyboard interactions, in a Diagram.
There are many kinds of predefined Tool classes that implement all of the common operations that users do.
</p>
<p>
For flexibility and simplicity, all input events are canonicalized as <a href="../api/symbols/InputEvent.html" target="api">InputEvent</a>s and
redirected by the diagram to go to the <a href="../api/symbols/Diagram.html#currentTool" target="api">Diagram.currentTool</a>.
By default the Diagram.currentTool is an instance of <a href="../api/symbols/ToolManager.html" target="api">ToolManager</a> held as the <a href="../api/symbols/Diagram.html#toolManager" target="api">Diagram.toolManager</a>.
The ToolManager implements support for all mode-less tools.
The ToolManager is responsible for finding another tool that is ready to run and then making it the new current tool.
This causes the new tool to process all of the input events (mouse, keyboard, and touch) until the tool decides that it is finished,
at which time the diagram's current tool reverts back to the <a href="../api/symbols/Diagram.html#defaultTool" target="api">Diagram.defaultTool</a>, which is normally the ToolManager, again.
</p>
<p>
More information can be found in the <a href="../intro/tools.html">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#tools">Related samples</a>
</p>
<hr>
<!-- blacklist tags that do not correspond to a specific GoJS feature -->
<h4>GoJS Extensions</h4>
<p>
<b>GoJS</b> can be extended in a variety of ways.
The most common way to change the standard behavior is to set properties on the <a href="../api/symbols/GraphObject.html" target="api">GraphObject</a>, <a href="../api/symbols/Diagram.html" target="api">Diagram</a>, <a href="../api/symbols/CommandHandler.html" target="api">CommandHandler</a>, <a href="../api/symbols/Tool.html" target="api">Tool</a>, or <a href="../api/symbols/Layout.html" target="api">Layout</a>.
But when the desired property does not exist, you might need to override methods of CommandHandler, Tool, Layout, Link, or Node.
Methods that you can override are documented in the API reference.
Various features of GoJS can be overriden, either by replacing a method on an instance (a feature of JavaScript) or by defining a subclass.
You should not modify the prototypes of any of the <b>GoJS</b> classes.
</p>
<p>
In addition to our samples, <b>GoJS</b> provides an <strong><a href="../samples/#extensions">extensions gallery</a></strong>,
showcasing the creation of custom tools and layouts.
Those classes and samples are written in TypeScript, available at <code>../extensionsJSM/</code>,
as ECMAScript/JavaScript modules -- these use the <code>../release/go-module.js</code> library.
We recommend that you copy the files that you need into your project, so that you can adjust how they refer to the GoJS library
that you choose and so that you can include them into your own building and packaging procedures.
</p>
<p>
More information can be found in the <a href="../intro/extensions.html">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#extensions">Related samples</a>
</p>
<hr>
</div>
</div>
</body>
<!-- This script is part of the gojs.net website, and is not needed to run the sample -->
<script src="../assets/js/goSamples.js"></script>
</html>