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<title>Friend Wheel</title>
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<h1 class="my-0 p-1 ">GoJS</h1>
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<!-- Start of GoJS sample code -->
<script src="/js/gojs/release/go.js"></script>
<div id="allSampleContent" class="p-4 w-full">
<script id="code">
class WheelLayout extends go.CircularLayout {
// override makeNetwork to set the diameter of each node and ignore the TextBlock label
makeNetwork(coll) {
const net = super.makeNetwork(coll);
net.vertexes.each(cv => cv.diameter = 20); // because our desiredSize for nodes is (20, 20)
return net;
}
// override commitNodes to rotate nodes so the text goes away from the center,
// and flip text if it would be upside-down
commitNodes() {
super.commitNodes();
this.network.vertexes.each(v => {
const node = v.node;
if (node === null) return;
// get the angle of the node towards the center, and rotate it accordingly
const a = v.actualAngle;
if (a > 90 && a < 270) { // make sure the text isn't upside down
const textBlock = node.findObject("TEXTBLOCK");
textBlock.angle = 180;
}
node.angle = a;
});
}
// override commitLinks in order to make sure all of the Bezier links are "inside" the ellipse;
// this helps avoid links crossing over any other nodes
commitLinks() {
super.commitLinks();
if (this.network.vertexes.count > 4) {
this.network.vertexes.each(v => {
v.destinationEdges.each(de => {
const dv = de.toVertex;
let da = dv.actualAngle;
let sa = v.actualAngle;
if (da - sa > 180) da -= 360;
else if (sa - da > 180) sa -= 360;
de.link.curviness = (sa > da) ? 15 : -15;
})
})
}
}
}
// end WheelLayout class
const highlightColor = "red"; // color parameterization
function init() {
// Since 2.2 you can also author concise templates with method chaining instead of GraphObject.make
// For details, see https://gojs.net/latest/intro/buildingObjects.html
const $ = go.GraphObject.make; // for conciseness in defining templates
myDiagram =
$(go.Diagram, "myDiagramDiv", // must be the ID or reference to div
{
initialAutoScale: go.Diagram.Uniform,
padding: 10,
contentAlignment: go.Spot.Center,
layout:
$(WheelLayout, // set up a custom CircularLayout
// set some properties appropriate for this sample
{
arrangement: go.CircularLayout.ConstantDistance,
nodeDiameterFormula: go.CircularLayout.Circular,
spacing: 10,
aspectRatio: 0.7,
sorting: go.CircularLayout.Optimized
}),
isReadOnly: true,
click: e => { // background click clears any remaining highlighteds
e.diagram.startTransaction("clear");
e.diagram.clearHighlighteds();
e.diagram.commitTransaction("clear");
}
});
// define the Node template
myDiagram.nodeTemplate =
$(go.Node, "Horizontal",
{
selectionAdorned: false,
locationSpot: go.Spot.Center, // Node.location is the center of the Shape
locationObjectName: "SHAPE",
mouseEnter: (e, node) => {
node.diagram.clearHighlighteds();
node.linksConnected.each(l => highlightLink(l, true));
node.isHighlighted = true;
const tb = node.findObject("TEXTBLOCK");
if (tb !== null) tb.stroke = highlightColor;
},
mouseLeave: (e, node) => {
node.diagram.clearHighlighteds();
const tb = node.findObject("TEXTBLOCK");
if (tb !== null) tb.stroke = "black";
}
},
new go.Binding("text", "text"), // for sorting the nodes
$(go.Shape, "Ellipse",
{
name: "SHAPE",
fill: "lightgray", // default value, but also data-bound
stroke: "transparent", // modified by highlighting
strokeWidth: 2,
desiredSize: new go.Size(20, 20),
portId: ""
}, // so links will go to the shape, not the whole node
new go.Binding("fill", "color"),
new go.Binding("stroke", "isHighlighted",
h => h ? highlightColor : "transparent")
.ofObject()),
$(go.TextBlock,
{ name: "TEXTBLOCK" }, // for search
new go.Binding("text", "text"))
);
function highlightLink(link, show) {
link.isHighlighted = show;
link.fromNode.isHighlighted = show;
link.toNode.isHighlighted = show;
}
// define the Link template
myDiagram.linkTemplate =
$(go.Link,
{
routing: go.Link.Normal,
curve: go.Link.Bezier,
selectionAdorned: false,
mouseEnter: (e, link) => highlightLink(link, true),
mouseLeave: (e, link) => highlightLink(link, false)
},
$(go.Shape,
new go.Binding("stroke", "isHighlighted",
(h, shape) => h ? highlightColor : shape.part.data.color)
.ofObject(),
new go.Binding("strokeWidth", "isHighlighted",
h => h ? 2 : 1)
.ofObject())
// no arrowhead -- assume directionality of relationship need not be shown
);
generateGraph();
}
function generateGraph() {
const names = [
"Joshua", "Daniel", "Robert", "Noah", "Anthony",
"Elizabeth", "Addison", "Alexis", "Ella", "Samantha",
"Joseph", "Scott", "James", "Ryan", "Benjamin",
"Walter", "Gabriel", "Christian", "Nathan", "Simon",
"Isabella", "Emma", "Olivia", "Sophia", "Ava",
"Emily", "Madison", "Tina", "Elena", "Mia",
"Jacob", "Ethan", "Michael", "Alexander", "William",
"Natalie", "Grace", "Lily", "Alyssa", "Ashley",
"Sarah", "Taylor", "Hannah", "Brianna", "Hailey",
"Christopher", "Aiden", "Matthew", "David", "Andrew",
"Kaylee", "Juliana", "Leah", "Anna", "Allison",
"John", "Samuel", "Tyler", "Dylan", "Jonathan",
];
const nodeDataArray = [];
for (let i = 0; i < names.length; i++) {
nodeDataArray.push({ key: i, text: names[i], color: go.Brush.randomColor(128, 240) });
}
const linkDataArray = [];
const num = nodeDataArray.length;
for (let i = 0; i < num * 2; i++) {
const a = Math.floor(Math.random() * num);
const b = Math.floor(Math.random() * num / 4) + 1;
linkDataArray.push({ from: a, to: (a + b) % num, color: go.Brush.randomColor(0, 127) });
}
myDiagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
}
window.addEventListener('DOMContentLoaded', init);
</script>
<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; background: white; width: 100%; height: 600px" ></div>
<p>
This "friend wheel" demonstrates the use of <a>CircularLayout</a>.
The layout has been customized to make sure each node is considered to have a fixed diameter,
ignoring the size of any <a>TextBlock</a>.
</p>
<p>
The custom layout also rotates each <a>Node</a> according to the actual angle at which the node was positioned.
This information is available on the <a>CircularVertex</a> used by the <a>LayoutNetwork</a> that
the <a>CircularLayout</a> constructs from the nodes and links of the diagram.
Furthermore, when laying out the nodes it also flips the angle of the <a>TextBlock</a> so that the
text is not upside-down.
</p>
<p>
<a>GraphObject.mouseEnter</a> and <a>GraphObject.mouseLeave</a> event handlers on the <a>Node</a> template
highlight both the Node and all of the Links that connect with the Node.
The same event handlers on the <a>Link</a>s highlight that Link and both connected Nodes.
Changes made in these event handlers automatically are not recorded in the <a>UndoManager</a>,
although this sample does not enable the UndoManager anyway.
</p>
</div>
</div>
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<!-- End of GoJS sample code -->
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//
koh5_pano
Drag mouse to navigate.
Navigation
- Left/Right Mouse drag: Changes camera heading.
- Up/Sown Mouse drag: Changes camera pitch.
- Scroll wheel: Changes camera field of view.
- I-Key: Displays Info panel with canvas size, image size and FPS.
17.Aug.2010, Martin Wengenmayer