最近开始研究d3js。
先安利两个Demo
1、Circle Dragging IV
来自：Mike Bostock
<!DOCTYPE html><meta charset="utf-8"><style>path { pointer-events: all; fill: none; stroke: #666; stroke-opacity: 0.2;}.active circle { stroke: #000; stroke-width: 2px;}</style><svg width="960" height="500"></svg><script src="https://d3js.org/d3.v4.min.js"></script><script>var svg = d3.select("svg"), width = +svg.attr("width"), height = +svg.attr("height"), radius = 32;var circles = d3.range(20).map(function() { return { x: Math.round(Math.random() * (width - radius * 2) + radius), y: Math.round(Math.random() * (height - radius * 2) + radius) };});var color = d3.scaleOrdinal() .range(d3.schemeCategory20);var voronoi = d3.voronoi() .x(function(d) { return d.x; }) .y(function(d) { return d.y; }) .extent([[-1, -1], [width + 1, height + 1]]);var circle = svg.selectAll("g") .data(circles) .enter().append("g") .call(d3.drag() .on("start", dragstarted) .on("drag", dragged) .on("end", dragended));var cell = circle.append("path") .data(voronoi.polygons(circles)) .attr("d", renderCell) .attr("id", function(d, i) { return "cell-" + i; });circle.append("clipPath") .attr("id", function(d, i) { return "clip-" + i; }) .append("use") .attr("xlink:href", function(d, i) { return "#cell-" + i; });circle.append("circle") .attr("clip-path", function(d, i) { return "url(#clip-" + i + ")"; }) .attr("cx", function(d) { return d.x; }) .attr("cy", function(d) { return d.y; }) .attr("r", radius) .style("fill", function(d, i) { return color(i); });function dragstarted(d) { d3.select(this).raise().classed("active", true);}function dragged(d) { d3.select(this).select("circle").attr("cx", d.x = d3.event.x).attr("cy", d.y = d3.event.y); cell = cell.data(voronoi.polygons(circles)).attr("d", renderCell);}function dragended(d, i) { d3.select(this).classed("active", false);}function renderCell(d) { return d == null ? null : "M" + d.join("L") + "Z";}</script>2、GitHub Visualizer更多gallery 猛击：https://github.com/d3/d3/wiki/Gallery
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