gojs
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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>State Chart with Simple Curved Link Reshaping</title>
<meta name="description" content="TypeScript: Changing the curviness of a link using a single reshaping handle." />
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- /* Copyright 1998-2020 by Northwoods Software Corporation. */ -->
<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
</head>
<body>
<div id="sample">
<div id="myDiagramDiv" style="background-color: whitesmoke; border: solid 1px black; width: 100%; height: 400px"></div>
<p>
This sample is a modification of the <a href="../samples/stateChart.html">State Chart</a> sample that makes use of
the CurvedLinkReshapingTool that is defined in its own file, as <a href="CurvedLinkReshapingTool.ts">CurvedLinkReshapingTool.ts</a>.
</p>
<p>
Note that unlike the standard case of a Bezier-curved Link that is <a>Part.reshapable</a>, there is only one reshape
handle When the user drags that handle, the value of <a>Link.curviness</a> is modified, causing the link to be curved
differently. This sample also defines a TwoWay <a>Binding</a> on that property, thereby saving the curviness to the
model data. Unlike the regular State Chart sample, there is no Binding on <a>Link.points</a>, which is no longer needed
when the curviness is the only modified property.
</p>
<button id="SaveButton" onclick="save()">Save</button>
<button id="LoadButton" onclick="load()">Load</button> Diagram Model saved in JSON format:
<br />
<textarea id="mySavedModel" style="width:100%;height:300px">
{ "nodeKeyProperty": "id",
"nodeDataArray": [
{ "id": 0, "loc": "120 120", "text": "Initial" },
{ "id": 1, "loc": "330 120", "text": "First down" },
{ "id": 2, "loc": "226 376", "text": "First up" },
{ "id": 3, "loc": "60 276", "text": "Second down" },
{ "id": 4, "loc": "226 226", "text": "Wait" }
],
"linkDataArray": [
{ "from": 0, "to": 0, "text": "up or timer", "curviness": -20 },
{ "from": 0, "to": 1, "text": "down", "curviness": 20 },
{ "from": 1, "to": 0, "text": "up (moved)\nPOST", "curviness": 20 },
{ "from": 1, "to": 1, "text": "down", "curviness": -20 },
{ "from": 1, "to": 2, "text": "up (no move)" },
{ "from": 1, "to": 4, "text": "timer" },
{ "from": 2, "to": 0, "text": "timer\nPOST" },
{ "from": 2, "to": 3, "text": "down" },
{ "from": 3, "to": 0, "text": "up\nPOST\n(dblclick\nif no move)" },
{ "from": 3, "to": 3, "text": "down or timer", "curviness": 20 },
{ "from": 4, "to": 0, "text": "up\nPOST" },
{ "from": 4, "to": 4, "text": "down" }
]
}
</textarea>
</div>
<script type="module" id="code">
import * as go from "../release/go-module.js";
import { CurvedLinkReshapingTool } from './CurvedLinkReshapingTool.js';
if (window.goSamples) goSamples(); // init for the samples -- you don't need to call this
const $ = go.GraphObject.make; // for conciseness in defining templates
const myDiagram =
$(go.Diagram, 'myDiagramDiv', // must name or refer to the DIV HTML element
{
// have mouse wheel events zoom in and out instead of scroll up and down
'toolManager.mouseWheelBehavior': go.ToolManager.WheelZoom,
// support double-click in background creating a new node
'clickCreatingTool.archetypeNodeData': { text: 'new node' },
'linkReshapingTool': new CurvedLinkReshapingTool(),
// enable undo & redo
'undoManager.isEnabled': true
});
// 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.substr(0, idx);
}
});
// define the Node template
myDiagram.nodeTemplate =
$(go.Node, 'Auto', new go.Binding('location', 'loc', go.Point.parse).makeTwoWay(go.Point.stringify),
// define the node's outer shape, which will surround the TextBlock
$(go.Shape, 'RoundedRectangle', {
parameter1: 20,
fill: $(go.Brush, 'Linear', { 0: 'rgb(254, 201, 0)', 1: 'rgb(254, 162, 0)' }),
stroke: 'black',
portId: '',
fromLinkable: true,
fromLinkableSelfNode: true,
fromLinkableDuplicates: true,
toLinkable: true,
toLinkableSelfNode: true,
toLinkableDuplicates: true,
cursor: 'pointer'
}), $(go.TextBlock, {
font: 'bold 11pt helvetica, bold arial, sans-serif',
editable: true // editing the text automatically updates the model data
}, new go.Binding('text', 'text').makeTwoWay()));
// unlike the normal selection Adornment, this one includes a Button
myDiagram.nodeTemplate.selectionAdornmentTemplate =
$(go.Adornment, 'Spot', $(go.Panel, 'Auto', $(go.Shape, { fill: null, stroke: 'blue', strokeWidth: 2 }), $(go.Placeholder) // this represents the selected Node
),
// the button to create a "next" node, at the top-right corner
$('Button', {
alignment: go.Spot.TopRight,
click: addNodeAndLink // this function is defined below
}, $(go.Shape, 'PlusLine', { desiredSize: new go.Size(6, 6) })) // end button
); // end Adornment
// clicking the button inserts a new node to the right of the selected node,
// and adds a link to that new node
function addNodeAndLink(e, obj) {
const adorn = obj.part;
const fromNode = adorn.adornedPart;
if (fromNode === null)
return;
e.handled = true;
const diagram = e.diagram;
diagram.startTransaction('Add State');
// get the node data for which the user clicked the button
const fromData = fromNode.data;
// create a new "State" data object, positioned off to the right of the adorned Node
const toData = { text: 'new' };
const p = fromNode.location.copy();
p.x += 200;
toData.loc = go.Point.stringify(p); // the "loc" property is a string, not a Point object
// add the new node data to the model
const model = diagram.model;
model.addNodeData(toData);
// create a link data from the old node data to the new node data
const linkdata = {
from: model.getKeyForNodeData(fromData),
to: model.getKeyForNodeData(toData),
text: 'transition'
};
// and add the link data to the model
model.addLinkData(linkdata);
// select the new Node
const newnode = diagram.findNodeForData(toData);
diagram.select(newnode);
diagram.commitTransaction('Add State');
// if the new node is off-screen, scroll the diagram to show the new node
if (newnode !== null)
diagram.scrollToRect(newnode.actualBounds);
}
// replace the default Link template in the linkTemplateMap
myDiagram.linkTemplate =
$(go.Link, // the whole link panel
{ curve: go.Link.Bezier, reshapable: true },
// don't need to save Link.points, so don't need TwoWay Binding on "points"
new go.Binding('curviness', 'curviness').makeTwoWay(), // but save "curviness" automatically
$(go.Shape, // the link shape
{ strokeWidth: 1.5 }), $(go.Shape, // the arrowhead
{ toArrow: 'standard', stroke: null }), $(go.Panel, 'Auto', $(go.Shape, // the label background, which becomes transparent around the edges
{
fill: $(go.Brush, 'Radial', { 0: 'rgb(240, 240, 240)', 0.3: 'rgb(240, 240, 240)', 1: 'rgba(240, 240, 240, 0)' }),
stroke: null
}), $(go.TextBlock, 'transition', // the label text
{
textAlign: 'center',
font: '10pt helvetica, arial, sans-serif',
stroke: 'black',
margin: 4,
editable: true // editing the text automatically updates the model data
}, new go.Binding('text', 'text').makeTwoWay())));
// 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);
}
// read in the JSON-format data from the "mySavedModel" element
load();
document.getElementById("SaveButton").onclick = save;
document.getElementById("LoadButton").onclick = load;
window.myDiagram = myDiagram; // Attach to the window for console debugging
</script>
</body>
</html>