了解 force layout node 及 link 操作
將原本寫死的三個動作，變成可以自由新增 node 與 link
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17-Modifying a Force Layout
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .link { | |
| stroke: #000; | |
| stroke-width: 1.5px; | |
| } | |
| .node { | |
| fill: #000; | |
| stroke: #fff; | |
| stroke-width: 1.5px; | |
| } | |
| .selected { | |
| stroke: #f00; | |
| stroke-width: 3px; | |
| } | |
| .desc { | |
| fill: #aaa; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var color = d3.scale.category10(); | |
| var serial = 0; | |
| var nodes = [], | |
| links = []; | |
| var force = d3.layout.force() | |
| .nodes(nodes) | |
| .links(links) | |
| .charge(-500) | |
| .linkDistance(120) | |
| .size([width, height]) | |
| .on("tick", tick); | |
| var drag = force.drag(); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var node = svg.selectAll(".node"), | |
| link = svg.selectAll(".link"); | |
| svg.append("text") | |
| .attr("class", "desc") | |
| .attr("x", 10) | |
| .attr("y", 20) | |
| .text("新增節點：按住 shift 鍵再按滑鼠左鍵"); | |
| svg.append("text") | |
| .attr("class", "desc") | |
| .attr("x", 10) | |
| .attr("y", 40) | |
| .text("連結節點：對要連結的節點點一下，再點選另一個節點"); | |
| setTimeout(function() { | |
| var a = {id: serial++}, b = {id: serial++}, c = {id: serial++}; | |
| nodes.push(a, b, c); | |
| links.push({source: a, target: b}, {source: a, target: c}, {source: b, target: c}); | |
| start(); | |
| }, 0); | |
| function start() { | |
| link = link.data(force.links(), function(d) { return d.source.id + "-" + d.target.id; }); | |
| link.enter().insert("line", ".node").attr("class", "link"); | |
| link.exit().remove(); | |
| node = node.data(force.nodes(), function(d) { return d.id;}); | |
| node.enter().append("circle") | |
| .attr("class", function(d) { return "node"; }) | |
| .attr("r", 12) | |
| .style("fill", function(d, i) { return color(i); }) | |
| .call(drag) | |
| .on('click', function(d) { | |
| if (d3.select(this).classed("selected")) { | |
| d3.select(this).attr("class", function(d) { return "node"; }) | |
| } else { | |
| d3.select(this).attr("class", function(d) { return "node selected"; }) | |
| tryConnect(); | |
| } | |
| }) | |
| .on('dbclick', function(d) { console.log("XD");}); | |
| node.exit().remove(); | |
| force.start(); | |
| } | |
| function tick() { | |
| node.attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }) | |
| 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; }); | |
| } | |
| function tryConnect() { | |
| var selected = svg.selectAll('.selected'); | |
| var selectedData = selected.data(); | |
| console.log(selectedData); | |
| if (selectedData.length == 2) { | |
| console.log(links); | |
| links.push({source: selectedData[0], target: selectedData[1]}); | |
| selected.attr("class", "node"); | |
| start(); | |
| } | |
| } | |
| function drawCircle(x, y) { | |
| var c = {id: serial++, } | |
| nodes.push(c); | |
| start(); | |
| } | |
| svg.on('click', function() { | |
| if (d3.event.shiftKey == true) { | |
| var coords = d3.mouse(this); | |
| drawCircle(coords[0], coords[1]); | |
| } | |
| }); | |
| </script> |
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