Public
Edited
Feb 3, 2023
nodes = [
{ id: "1", data: { x: 100, y: 100 } },
{ id: "2", data: { x: 150, y: 100 } }
]
edges = [{ id: "Edge", source: "1", target: "2", data: {} }]
graph = new GraphLib.Graph({ nodes, edges })
drawGraph = {
return async (graph) => {
const canvas = createCanvas();
invalidation.then(() => canvas.destroy());
await canvas.ready;
// Draw lines
graph.getAllEdges().forEach((edge) => {
drawEdge(canvas, edge);
});
// Draw nodes
graph.getAllNodes().forEach((node) => {
drawNode(canvas, node);
});
return canvas.getConfig().container;
};
}
addNode = (id) => {
// Add a new node on random position
graph.addNode({
id,
data: { x: _.random(10, 390), y: _.random(10, 390) }
});
// Connect it with a random node.
const allNodes = graph.getAllNodes();
const targetNode = allNodes[_.random(allNodes.length - 2)];
if (targetNode) {
graph.addEdge({
id,
source: id,
target: targetNode.id,
data: {}
});
}
}
removeNode = () => {
const allNodes = graph.getAllNodes();
const targetNode = allNodes[_.random(allNodes.length - 1)];
if (targetNode) {
graph.removeNode(targetNode.id);
}
}
drawGraphOnDemand = {
return async (graph) => {
const canvas = createCanvas();
invalidation.then(() => {
canvas.destroy();
graph.onChanged = () => {};
});
await canvas.ready;
// Draw existing lines.
graph.getAllEdges().forEach((edge) => {
drawEdge(canvas, edge);
});
// Draw existing nodes.
graph.getAllNodes().forEach((node) => {
drawNode(canvas, node);
});
// Update when changed.
graph.onChanged = (event) => {
event.changes.forEach((change) => {
if (change.type === "NodeAdded") {
const node = change.value;
drawNode(canvas, node);
} else if (change.type === "NodeRemoved") {
const node = change.value;
canvas.document.getElementById(node.id).remove();
} else if (change.type === "EdgeAdded") {
const edge = change.value;
drawEdge(canvas, edge);
} else if (change.type === "EdgeRemoved") {
const edge = change.value;
canvas.document.getElementById(edge.id).remove();
}
});
};
return canvas.getConfig().container;
};
}
addThreeNodes = (id) => {
graph.batch(() => {
addNode(id + "-1");
addNode(id + "-2");
addNode(id + "-3");
});
}
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