Add graph-maker site
This commit is contained in:
parent
dcf5cc3c45
commit
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svg {
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cursor: crosshair;
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display: block;
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margin: auto;
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background-color: #FFFFFF;
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}
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.edge {
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stroke: #888;
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stroke-width: 2px;
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stroke-linecap: round;
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stroke-linejoin: round;
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cursor: default;
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}
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.edge:hover,
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.dragLine {
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stroke: #333;
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stroke-width: 3px;
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}
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.vertex {
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cursor: pointer;
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}
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.vertex:hover {
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stroke: #333;
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opacity: 0.8;
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}
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.dragLine.hidden {
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stroke-width: 0;
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}
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"use strict";
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//node ids are in order in which nodes come in existence
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var univSvgHeight;
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var univSvgWidth;
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const nodes = [{ id: 1 }, { id: 2 }, { id: 3 }];
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const links = [
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{ source: 0, target: 1 },
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{ source: 0, target: 2 },
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{ source: 1, target: 2 }
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];
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//universal width and height let index.htm control svg dimensions when needed
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let lastNodeId = nodes.length;
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var w = univSvgWidth ? univSvgWidth : 616,
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h = univSvgHeight ? univSvgHeight : 400,
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rad = 10,
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wid = 10;
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const svg = d3
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.select("#svg-wrap")
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.append("svg")
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.attr("width", w)
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.attr("height", h);
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const dragLine = svg
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.append("path")
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.attr("class", "dragLine hidden")
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.attr("d", "M0,0L0,0");
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let edges = svg.append("g").selectAll(".edge");
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let vertices = svg.append("g").selectAll(".vertex");
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const force = d3
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.forceSimulation()
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.force(
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"charge",
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d3
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.forceManyBody()
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.strength(-300)
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.distanceMax(w / 2)
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)
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.force("link", d3.forceLink().distance(60))
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.force("x", d3.forceX(w / 2))
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.force("y", d3.forceY(h / 2))
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.on("tick", tick);
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force.nodes(nodes);
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force.force("link").links(links);
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const fgColor = '#ffffff'
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const colors = d3.schemeCategory10;
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let mousedownNode = null;
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const clrBtn = d3.select("#clear-graph");
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clrBtn.on("click", clearGraph);
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const nodename = (id) =>
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id <= 26 ?
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String.fromCharCode(id + 96) :
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String.fromCharCode(parseInt(id / 26) + 96) + String.fromCharCode((id % 26) + 96);
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//empties the graph
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function clearGraph() {
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nodes.splice(0);
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links.splice(0);
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lastNodeId = 0;
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restart();
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showGraphLatex();
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}
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//update the simulation
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function tick() {
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edges
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.attr("x1", (d) => d.source.x)
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.attr("y1", (d) => d.source.y)
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.attr("x2", (d) => d.target.x)
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.attr("y2", (d) => d.target.y);
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vertices
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.attr("cx", (d) => d.x)
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.attr("cy", (d) => d.y);
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}
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function addNode() {
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const e = d3.event;
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if (e.button == 0) {
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var coords = d3.mouse(e.currentTarget);
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var newNode = { x: coords[0], y: coords[1], id: ++lastNodeId };
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nodes.push(newNode);
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restart();
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showGraphLatex();
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}
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}
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function removeNode(d, i) {
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//to make ctrl-drag works for mac/osx users
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if (d3.event.ctrlKey) return;
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nodes.splice(nodes.indexOf(d), 1);
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links
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.filter((l) => l.source === d || l.target === d)
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.foreach((l) => links.splice(links.indexOf(l), 1));
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d3.event.preventDefault();
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restart();
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showGraphLatex();
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}
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function removeEdge(d, i) {
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links.splice(links.indexOf(d), 1);
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d3.event.preventDefault();
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restart();
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showGraphLatex();
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}
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function beginDragLine(d) {
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//to prevent call of addNode through svg
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d3.event.stopPropagation();
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//to prevent dragging of svg in firefox
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d3.event.preventDefault();
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if (d3.event.ctrlKey || d3.event.button != 0) return;
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mousedownNode = d;
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dragLine
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.classed("hidden", false)
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.attr("d", `M${mousedownNode.x},${mousedownNode.y}L${mousedownNode.x},${mousedownNode.y}`);
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}
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function updateDragLine() {
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var coords = d3.mouse(d3.event.currentTarget);
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if (!mousedownNode) return;
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dragLine.attr("d", `M${mousedownNode.x},${mousedownNode.y}L${coords[0]},${coords[1]}`);
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}
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function hideDragLine() {
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dragLine.classed("hidden", true);
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mousedownNode = null;
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restart();
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}
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//no need to call hideDragLine() and restart() in endDragLine
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//mouseup on vertices propagates to svg which calls hideDragLine
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function endDragLine(d) {
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if (!mousedownNode || mousedownNode === d) return;
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//return if link already exists
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if (links.some(l =>
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(l.source === mousedownNode && l.target === d) ||
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(l.source === d && l.target === mousedownNode)
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)) return;
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const newLink = { source: mousedownNode, target: d };
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links.push(newLink);
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showGraphLatex();
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}
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//one response per ctrl keydown
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var lastKeyDown = -1;
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function keydown() {
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d3.event.preventDefault();
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if (lastKeyDown !== -1) return;
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lastKeyDown = d3.event.key;
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if (lastKeyDown === "Control") {
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vertices.call(
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d3
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.drag()
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.on("start", (d) => {
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if (!d3.event.active) force.alphaTarget(1).restart();
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d.fx = d.x;
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d.fy = d.y;
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})
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.on("drag", (d) => {
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d.fx = d3.event.x;
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d.fy = d3.event.y;
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})
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.on("end", (d) => {
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if (!d3.event.active) force.alphaTarget(0);
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d.fx = null;
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d.fy = null;
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})
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);
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}
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}
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function keyup() {
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lastKeyDown = -1;
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if (d3.event.key === "Control")
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vertices.on("mousedown.drag", null);
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}
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//updates the graph by updating links, nodes and binding them with DOM
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//interface is defined through several events
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function restart() {
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edges = edges.data(links, (d) => "v" + d.source.id + "-v" + d.target.id);
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edges.exit().remove();
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var ed = edges
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.enter()
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.append("line")
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.attr("class", "edge")
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// .style("stroke", (d, _) => '#888')
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.on("mousedown", () => d3.event.stopPropagation())
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.on("contextmenu", removeEdge);
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ed.append("title").text(d => "v" + d.source.id + "-v" + d.target.id);
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edges = ed.merge(edges);
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//vertices are known by id
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vertices = vertices.data(nodes, (d) => d.id);
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vertices.exit().remove();
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var ve = vertices
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.enter()
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.append("circle")
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.attr("r", rad)
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.attr("class", "vertex")
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.style("fill", (d, _) => colors[d.id % 10])
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.on("mousedown", beginDragLine)
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.on("mouseup", endDragLine)
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.on("contextmenu", removeNode);
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ve.append("title").text(d => "v" + d.id);
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vertices = ve.merge(vertices);
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// edges.sort((a, b) => a.source !== b.source ? a.source > b.source : a.target > b.target)
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links.sort((a, b) => a.source !== b.source ? a.source > b.source : a.target > b.target)
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force.nodes(nodes);
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force.force("link").links(links);
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force.alpha(0.8).restart();
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}
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//further interface
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svg
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.on("mousedown", addNode)
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.on("mousemove", updateDragLine)
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.on("mouseup", hideDragLine)
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.on("contextmenu", () => d3.event.preventDefault())
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.on("mouseleave", hideDragLine);
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d3.select(window)
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.on("keydown", keydown)
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.on("keyup", keyup);
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restart();
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showGraphLatex();
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//handling output area
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function showGraphLatex() {
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const v = "\\[ V = \\{ " +
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nodes
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.map(({ id }, i) => {
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return (i == 0) ?
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`${nodename(id)}` :
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`, ${nodename(id)}`;
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//add line break
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// if ((i + 1) % 15 == 0) v += "\\\\";
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})
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.join('') +
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" \\} \\]\n\n";
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const e = "\\[ E = \\{" +
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links.map(({ source, target }, i) => {
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if (i == links.length - 1)
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return `${nodename(source.id)}${nodename(target.id)}`;
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else
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return `${nodename(source.id)}${nodename(target.id)}, `;
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// //add line break
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// if ((i + 1) % 10 == 0) e += "\\\\";
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}).join('') +
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"\\} \\]";
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document.getElementById("output").textContent = v + e;
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//recall mathjax
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document.getElementById("latex-output").textContent = v + e;
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MathJax.Hub.Queue(["Typeset", MathJax.Hub]);
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}
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function generateSVG() {
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const svgClone =
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document
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.getElementsByTagName("svg")[0]
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.cloneNode({ deep: true });
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svgClone
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.firstChild
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.childNodes
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.foreach(e => e.style.stroke = "#000000");
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var serializer = new XMLSerializer();
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var source = serializer.serializeToString(svgClone);
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if (!source.match(/^<svg[^>]+xmlns="http\:\/\/www\.w3\.org\/2000\/svg"/)) {
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source = source.replace(/^<svg/, '<svg xmlns="http://www.w3.org/2000/svg"');
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}
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if (!source.match(/^<svg[^>]+"http\:\/\/www\.w3\.org\/1999\/xlink"/)) {
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source = source.replace(/^<svg/, '<svg xmlns:xlink="http://www.w3.org/1999/xlink"');
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}
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source = '<?xml version="1.0" standalone="no"?>\r\n' + source;
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return "data:image/svg+xml;charset=utf-8," + encodeURIComponent(source);
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}
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function downloadSVG() {
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var downloadLink = document.createElement("a");
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downloadLink.href = generateSVG();
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downloadLink.download = 'graph.svg';
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document.body.appendChild(downloadLink);
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downloadLink.click();
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document.body.removeChild(downloadLink);
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}
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d3
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.select('#export-svg')
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.on('click', downloadSVG)
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Graph maker</title>
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<!-- <script src="https://d3js.org/d3.v6.min.js" defer></script> -->
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<script src="https://d3js.org/d3.v5.min.js"></script>
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<script src="https://code.jquery.com/jquery-3.6.0.slim.min.js" defer></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS_HTML-full"></script>
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<script src="./graph.js" defer></script>
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<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-eOJMYsd53ii+scO/bJGFsiCZc+5NDVN2yr8+0RDqr0Ql0h+rP48ckxlpbzKgwra6" crossorigin="anonymous" />
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<link rel="stylesheet" href="graph.css">
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</head>
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<body>
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<div id="app-area" class="d-flex-column justify-content-center">
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<div id="svg-wrap" class="bg-dark flex-column"></div>
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<div id="svg-buttons" class="text-center my-5 flex-column">
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<button class="btn btn-primary" id="clear-graph">Clear All</button>
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<button class="btn btn-primary" id="export-svg">Export SVG</button>
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<div class="flex-column">
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<input type="radio" class="btn-check" id="btn-check-outlined" autocomplete="off" checked>
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<label class="btn btn-outline-secondary" for="btn-check-outlined">Undirected</label><br>
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<input type="radio" class="btn-check" id="btn-check-outlined" autocomplete="off" disabled>
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<label class="btn btn-outline-secondary" for="btn-check-outlined">Directed</label><br>
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<input type="radio" class="btn-check" id="btn-check-outlined" autocomplete="off" disabled>
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<label class="btn btn-outline-secondary" for="btn-check-outlined">Tree</label><br>
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</div>
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</div>
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</div>
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<div class="row my-5 mx-5">
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<textarea name="output" id="output" cols="30" rows="10" class="col-sm"></textarea>
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<div id="latex-output" class="col-sm"></div>
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</div>
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</body>
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</html>
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