create-gojs-kit
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A CLI for downloading GoJS samples, extensions, and docs
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LassoSelectingTool lets the user draw a lasso to select nodes | GoJS Diagramming Library
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<script src="https://cdn.jsdelivr.net/npm/gojs@3.1.0"></script>
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<script src="../extensions/LassoSelectingTool.js"></script>
<script id="code">
function init() {
myDiagram =
new go.Diagram("myDiagramDiv", {
layout: new go.ForceDirectedLayout(),
dragSelectingTool: new LassoSelectingTool(),
"undoManager.isEnabled": true
});
myDiagram.nodeTemplate =
new go.Node("Auto")
.add(
new go.Shape({ fill: "white", portId: "" })
.bind("fill", "color"),
new go.TextBlock({ margin: 8 })
.bind("text")
);
myDiagram.model = new go.GraphLinksModel(
[
{ key: 1, text: "Alpha", color: "lightblue" },
{ key: 2, text: "Beta", color: "orange" },
{ key: 3, text: "Gamma", color: "lightgreen" },
{ key: 4, text: "Delta", color: "pink" },
{ key: 5, text: "Epsilon", color: "coral" },
{ key: 6, text: "Zeta", color: "tomato" },
{ key: 7, text: "Eta", color: "goldenrod" },
{ key: 8, text: "Theta", color: "turquoise" }
],
[
{ from: 1, to: 2 },
{ from: 1, to: 3 },
{ from: 2, to: 7 },
{ from: 3, to: 4 },
{ from: 3, to: 5 },
{ from: 4, to: 1 },
{ from: 5, to: 6 },
{ from: 5, to: 7 },
{ from: 5, to: 8 },
{ from: 8, to: 6 }
]);
}
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<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:600px"></div>
<p>
The <a>DragSelectingTool</a> has been replaced by the <a>LassoSelectingTool</a>.
Mouse-down, wait 175 milliseconds, and drag the mouse around all nodes that you want to select.
To be selected, a Node's <a>Node.selectionObject</a> must be completely within the temporarily-drawn magenta polygon.
You can use the <code>Shift</code> and <code>Ctrl</code> modifiers to affect how the selection is affected.
</p>
<p>
The tool is defined in its own file, as
<a href="../extensions/LassoSelectingingTool.js">LassoSelectingTool.js</a>.
</p>
</div>
</div>
<!-- * * * * * * * * * * * * * -->
<!-- End of GoJS sample code -->
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<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>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>
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