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<script type="ts">
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import GraphNode from "./GraphNode.svelte";
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import GraphEdge from "./GraphEdge.svelte";
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import { createEventDispatcher, onMount } from "svelte";
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import * as d3 from "d3";
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import type { TasksFile, TaskDescriptor } from "./task-loader";
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import { createNodesAndEdges } from "./graph-types";
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export let tasks: TasksFile;
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let hoveredTask: null | string = null;
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export let repulsionForce: number = -600;
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// Svelte automatically fills these with a reference
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let container: HTMLElement;
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let clientHeight: number;
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let clientWidth: number;
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let svgElement: SVGElement;
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// this prevents svelte from updating nodes and edges
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// when we update nodes and edges
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let [nodes, edges] = createNodesAndEdges(tasks);
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function hack() {
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[nodes, edges] = createNodesAndEdges(tasks, nodes, edges);
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runSimulation();
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}
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$: {
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tasks;
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hack();
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}
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const eventDispatcher = createEventDispatcher();
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const nodeClick = (task: TaskDescriptor) => (e: CustomEvent<MouseEvent>) => {
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eventDispatcher("selectTask", task);
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};
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const nodeHover = (task: TaskDescriptor) => (
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hovering: CustomEvent<boolean>
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) => {
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if (hovering.detail) {
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hoveredTask = task.id;
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eventDispatcher("preSelectTask", task);
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} else {
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if (hoveredTask == task.id) hoveredTask = null;
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eventDispatcher("unPreSelectTask", task);
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}
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};
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export function runSimulation() {
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// Let's list the force we wanna apply on the network
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let simulation = d3
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.forceSimulation(nodes) // Force algorithm is applied to data.nodes
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.force(
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"link",
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d3
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.forceLink() // This force provides links between nodes
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.id(function (d) {
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return d.id;
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}) // This provide the id of a node
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.links(edges) // and this the list of links
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)
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.force("charge", d3.forceManyBody().strength(repulsionForce)) // This adds repulsion between nodes. Play with the -400 for the repulsion strength
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.force("x", d3.forceX()) // attracts elements to the zero X coord
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.force("y", d3.forceY()) // attracts elements to the zero Y coord
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.on("tick", ticked)
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.on("end", ticked);
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// This function is run at each iteration of the force algorithm, updating the nodes position.
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function ticked() {
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edges = edges;
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nodes = nodes;
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}
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}
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// start simulation and center view on create
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onMount(() => {
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// set center of the SVG at (0,0)
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let svg = d3
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.select(svgElement)
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.attr("viewBox", [
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-clientWidth / 2,
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-clientHeight / 2,
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clientWidth,
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clientHeight,
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])
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.select("g");
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// setup zoom
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function zoomed(e) {
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svg.attr("transform", e.transform);
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}
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let zoomer = d3.zoom().scaleExtent([0.1, 2]).on("zoom", zoomed);
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d3.select(container).call(zoomer);
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runSimulation();
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});
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</script>
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<style>
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div {
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width: 100vw;
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height: 100vh;
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position: fixed;
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top: 0px;
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left: 0px;
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}
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:global(#header) {
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z-index: 20
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}
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:global(#wrapper) {
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display: flex;
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flex-direction: column;
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height: 100%;
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}
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:global(#page) {
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flex-grow: 1;
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}
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</style>
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<div bind:this={container} bind:clientHeight bind:clientWidth>
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<svg bind:this={svgElement}>
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<g>
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{#each edges as edge}
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<GraphEdge {edge} />
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{/each}
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{#each nodes as task}
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<GraphNode
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{task}
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on:taskClick
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on:click={nodeClick(task.task)}
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on:hoveringChange={nodeHover(task.task)} />
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{/each}
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</g>
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</svg>
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</div>
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