create-gojs-kit
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A CLI for downloading GoJS samples, extensions, and docs
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<meta name="description" content="A sequential function chart." />
<meta itemprop="description" content="A sequential function chart." />
<meta property="og:description" content="A sequential function chart." />
<meta name="twitter:description" content="A sequential function chart." />
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<meta itemprop="name" content="Sequential Function Chart for Control Systems with Steps, Transitions, Parallel Branches, and Convergences" />
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<title>
Sequential Function Chart for Control Systems with Steps, Transitions, Parallel Branches, and Convergences | GoJS Diagramming Library
</title>
</head>
<body>
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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();
});
document.addEventListener("click", function (e) {
// if the clicked element isn't the list, close the list
if (!topnavList.classList.contains("hidden") && !e.target.closest("#topnavList")) {
topButton.click();
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// set active <a> element
var url = window
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var aTags = topnavList.getElementsByTagName('a');
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var lowerhref = aTags[i]
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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 id="code">
function init() {
myDiagram = new go.Diagram('myDiagramDiv', {
layout: new go.LayeredDigraphLayout({
direction: 90,
layerSpacing: 10,
setsPortSpots: false
}),
'undoManager.isEnabled': true // enable undo & redo
});
// when the document is modified, add a "*" to the title and enable the "Save" button
myDiagram.addDiagramListener('Modified', e => {
const button = document.getElementById('SaveButton');
if (button) button.disabled = !myDiagram.isModified;
const idx = document.title.indexOf('*');
if (myDiagram.isModified) {
if (idx < 0) document.title += '*';
} else {
if (idx >= 0) document.title = document.title.slice(0, idx);
}
});
// define the step Node template
myDiagram.nodeTemplateMap.add('step',
new go.Node('Spot', { locationSpot: go.Spot.Center })
.bindTwoWay('location', 'loc', go.Point.parse, go.Point.stringify)
.add(
new go.Shape('Rectangle', {
fill: 'whitesmoke',
stroke: 'gray',
strokeWidth: 2,
desiredSize: new go.Size(160, 60),
portId: '', // so that links connect to the Shape, not to the whole Node
fromSpot: go.Spot.BottomSide,
toSpot: go.Spot.TopSide,
alignment: go.Spot.Center
}),
new go.TextBlock({
font: 'bold 16px sans-serif',
alignment: go.Spot.Center,
wrap: go.Wrap.Fit,
editable: true
})
.bindTwoWay('text')
)
);
// define the transition Node template.
myDiagram.nodeTemplateMap.add('transition',
new go.Node('Horizontal', {
locationSpot: go.Spot.Center,
locationObjectName: 'BAR'
})
.bindTwoWay('location', 'loc', go.Point.parse, go.Point.stringify)
.add(
new go.Shape('Rectangle', {
name: 'BAR',
fill: 'black',
stroke: null,
desiredSize: new go.Size(60, 8),
portId: '',
fromSpot: go.Spot.BottomSide,
toSpot: go.Spot.TopSide
}),
new go.TextBlock({
editable: true,
margin: 3
})
.bindTwoWay('text')
)
);
// define the parallel Node template.
myDiagram.nodeTemplateMap.add('parallel',
new go.Node({ locationSpot: go.Spot.Center })
.bindTwoWay('location', 'loc', go.Point.parse, go.Point.stringify)
.add(
new go.Shape('Rectangle', {
fill: 'whitesmoke',
stroke: 'black',
fromSpot: go.Spot.Bottom,
toSpot: go.Spot.Top,
desiredSize: new go.Size(200, 6),
portId: '',
fromSpot: go.Spot.BottomSide,
toSpot: go.Spot.TopSide
})
)
);
// define the Link template
myDiagram.linkTemplate =
new go.Link({ routing: go.Routing.Orthogonal })
.add(
new go.Shape({ stroke: 'black', strokeWidth: 2 })
);
// create the graph by reading the JSON data saved in "mySavedModel" textarea element
load();
}
// 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: 600px"></div>
<p>
<em>Sequential function charts</em> are used for programmable logic controllers (PLCs) and other control systems.
</p>
<p>
You can edit text in-place by clicking on the text of a selected node. The diagram uses 3 categories of node,
each added to the <a>Diagram.nodeTemplateMap</a>:
<ul>
<li><b>step</b></li>
<li><b>transition</b></li>
<li><b>parallel</b></li>
</ul>
</p>
<p>
See also the <a href="grafcet.html">grafcet diagram sample</a>.
</p>
<div>
<div>
<button id="SaveButton" onclick="save()">Save</button>
<button onclick="load()">Load</button>
Diagram Model saved in JSON format:
</div>
<textarea id="mySavedModel" style="width:100%;height:400px">
{ "class": "go.GraphLinksModel",
"nodeDataArray": [
{"key":"S1", "category":"step", "text":"Step 1"},
{"key":"TR1", "category":"transition", "text":"Transition 1"},
{"key":"S2", "category":"step", "text":"Step 2"},
{"key":"TR2", "category":"transition", "text":"Transition 2"},
{"key":"BAR1", "category":"parallel" },
{"key":"S3", "category":"step", "text":"Step 3"},
{"key":"S4", "category":"step", "text":"Step 4"},
{"key":"BAR2", "category":"parallel" },
{"key":"TR3", "category":"transition", "text":"Transition 3"},
{"key":"S5", "category":"step", "text":"Step 5"}
],
"linkDataArray": [
{"from":"S1", "to":"TR1"},
{"from":"TR1", "to":"S2"},
{"from":"S2", "to":"TR2"},
{"from":"TR2", "to":"BAR1"},
{"from":"BAR1", "to":"S3"},
{"from":"BAR1", "to":"S4"},
{"from":"S3", "to":"BAR2"},
{"from":"S4", "to":"BAR2"},
{"from":"BAR2", "to":"TR3"},
{"from":"TR3", "to":"S5"}
]}
</textarea>
</div>
</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>Layered Digraph Layout</h4>
<p>
This predefined layout is used for placing Nodes of a general directed graph in layers (rows or columns). This is more general than <a href="../api/symbols/TreeLayout.html">TreeLayout</a>,
as it does not require that the graph be tree-structured.
More information can be found in the <a href="../intro/layouts.html#LayeredDigraphLayout">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#layered-digraph">Related samples</a>
</p>
<hr>
<!-- blacklist tags that do not correspond to a specific GoJS feature -->
</div>
</div>
</body>
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<script src="../assets/js/goSamples.js"></script>
</html>