| license: gpl-3.0 | |
| height: 500 |
Using d3-drag + d3-force to render text. Words are totally unconnected here. Gray links shown just for demonstration purposes. Inspired by BW’s 2013 How To Issue.
Uses two little custom forces with d3-force:
forceLtr (as in "left to right") forces letters toward the right of the previous letter and toward the left of the next letter.
forceBaseline forces letters toward the y-coordinate of their neighbors, thereby establishing rough word-by-word baselines.
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| h1 { | |
| position: absolute; | |
| visibility: hidden; | |
| } | |
| svg { | |
| overflow: visible; | |
| } | |
| .links line { | |
| stroke: #aaa; | |
| /*stroke-width: 0;*/ | |
| } | |
| .nodes text { | |
| pointer-events: all; | |
| font-family: helvetica; | |
| font-size: 50px; | |
| text-anchor: middle; | |
| } | |
| </style> | |
| <h1>The How To Issue</h1> | |
| <svg width="960" height="500"></svg> | |
| <script src="https://d3js.org/d3.v4.0.0-alpha.40.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"); | |
| var graph = {}; | |
| var words = d3.select('h1').text().split(' ').map(function(d) { return d + ' '; }); | |
| var lettersByWord = words.map(function(word) { | |
| return word.split('').map(function(letter, i) { | |
| return { | |
| letter: letter, | |
| word: word, | |
| letterIndex: i | |
| } | |
| }) | |
| }); | |
| var wordStyles = words.map(function(d) { | |
| if (d==='How ') { | |
| return 80; | |
| } else if (d==='To ') { | |
| return 80; | |
| } else { | |
| return 50; | |
| } | |
| }) | |
| graph.nodes = [].concat.apply([],lettersByWord); | |
| graph.nodes.forEach(function(d,i) { | |
| d.id = i; | |
| var em = 4; | |
| var lineHeight = 4; | |
| d.x = -(d.word.length / 2 * em) + d.letterIndex * em + Math.random() * 50; | |
| d.y = -(words.length / 2 * lineHeight) + words.indexOf(d.word) * lineHeight + Math.random() * 50; | |
| d.prev = graph.nodes[i-1] ? graph.nodes[i-1].word === d.word ? graph.nodes[i-1] : undefined : undefined; | |
| d.next = graph.nodes[i+1] ? graph.nodes[i+1].word === d.word ? graph.nodes[i+1] : undefined : undefined; | |
| }); | |
| graph.links = d3.pairs(graph.nodes).map(function(d,i) { | |
| return { | |
| source: d[0].id, | |
| target: d[1].id, | |
| value: d[0].word === d[1].word ? 1 : 0 | |
| } | |
| }); | |
| graph.links = graph.links.filter(function(d) { | |
| return d.value > 0; | |
| }) | |
| var simulation = d3.forceSimulation() | |
| .force("link", d3.forceLink().id(function(d) { return d.id; })) | |
| .force("charge", d3.forceManyBody().strength(1.1)) | |
| .force("collide", d3.forceCollide().radius(function(d) { | |
| return wordStyles[words.indexOf(d.word)] / 2.7; | |
| })) | |
| .force("center", d3.forceCenter(width / 2, height / 2)) | |
| .force("ltr", forceLtr(1, 22)) | |
| .force("baseline", forceBaseline(.2)); | |
| var link = svg.append("g") | |
| .attr("class", "links") | |
| .selectAll("line") | |
| .data(graph.links) | |
| .enter().append("line"); | |
| var node = svg.append("g") | |
| .attr("class", "nodes") | |
| .selectAll("text") | |
| .data(graph.nodes) | |
| .enter().append("text") | |
| .style('font-size', function(d) { return wordStyles[words.indexOf(d.word)] + 'px'; }) | |
| .text(function(d) { return d.letter; }) | |
| .call(d3.drag() | |
| .on("start", dragstarted) | |
| .on("drag", dragged) | |
| .on("end", dragended)); | |
| node.append("title") | |
| .text(function(d) { return d.id; }); | |
| simulation | |
| .nodes(graph.nodes) | |
| .on("tick", ticked); | |
| simulation.force("link") | |
| .links(graph.links); | |
| function ticked() { | |
| link | |
| .attr("x1", function(d) { return d.source.x; }) | |
| .attr("y1", function(d) { return d.source.y; }) | |
| .attr("x2", function(d) { return d.target.x; }) | |
| .attr("y2", function(d) { return d.target.y; }); | |
| node | |
| .attr("x", function(d) { return d.x; }) | |
| .attr("y", function(d) { return d.y; }); | |
| } | |
| function dragstarted(d) { | |
| if (!d3.event.active) simulation.alphaTarget(0.3).restart() | |
| simulation.fix(d); | |
| } | |
| function dragged(d) { | |
| simulation.fix(d, d3.event.x, d3.event.y); | |
| } | |
| function dragended(d) { | |
| if (!d3.event.active) simulation.alphaTarget(0); | |
| simulation.unfix(d); | |
| } | |
| function forceLtr(_, __) { | |
| // offset means "each letter wants to be `offset` pixels ahead of the previous" | |
| // like letter spacing or ems | |
| var nodes, | |
| strength = _ || 1, | |
| offset = __ || 0; | |
| function force(alpha) { | |
| for (var i = 0, n = nodes.length, node, k = alpha; i < n; ++i) { | |
| node = nodes[i]; | |
| if(node.prev !== undefined) { | |
| node.vx += k * strength * Math.max(0, node.prev.x - node.x + offset); | |
| } | |
| if(node.next !== undefined) { | |
| node.vx -= k * strength * Math.max(0, node.x - node.next.x + offset); | |
| } | |
| } | |
| } | |
| force.initialize = function(_) { | |
| nodes = _; | |
| } | |
| return force; | |
| } | |
| function forceBaseline(_) { | |
| var nodes, | |
| strength = _ || 1; | |
| function force(alpha) { | |
| for (var i = 0, n = nodes.length, node, k = alpha; i < n; ++i) { | |
| node = nodes[i]; | |
| if(node.prev !== undefined) { | |
| node.vy += k * strength * (node.prev.y - node.y); | |
| } | |
| if(node.next !== undefined) { | |
| node.vy -= k * strength * (node.y - node.next.y); | |
| } | |
| } | |
| } | |
| force.initialize = function(_) { | |
| nodes = _; | |
| } | |
| return force; | |
| } | |
| </script> |
