d3.js - How to change point size using geojson file in D3 -


i need little help. think primitive question stuck @ point. have map in orthographic projection in d3 , geojson file contains points representing earthquakes. able display points. have same size. want change size of each point refering "mag" number in geojson file. can me please? here code:

<!doctype html> <meta charset="utf-8"> <meta http-equiv="refresh" content="300" /> <style> .graticule {  fill: none;  stroke: black;  stroke-width:.5;  opacity:.1; } .land {  fill: rgb(117, 87, 57);  stroke: black;  stroke-opacity: .2; } </style> <body> <body background="space5.jpg">  <div id="map"></div> <script src="d3.v3.min.js"></script> <script src="topojson.v0.min.js"></script> <script> var diameter = 700,     radius = diameter/2,     velocity = .005,     = date.now();  var projection = d3.geo.orthographic()         .scale(radius - 2)         .translate([radius, radius])         .clipangle(90);  var graticule = d3.geo.graticule();  var svg = d3.select("body").append("svg") .attr("width", diameter) .attr("height", diameter);  var path = d3.geo.path() .projection(projection)  var ocean_fill = svg.append("defs").append("radialgradient")       .attr("id", "ocean_fill")       .attr("cx", "75%")       .attr("cy", "25%");   ocean_fill.append("stop").attr("offset", "55%").attr("stop-color", "#ddf");   ocean_fill.append("stop").attr("offset", "100%").attr("stop-color", "#9ab");  //load sphere  var globe = {type: "sphere"}; svg.append("path") .datum(globe) .attr("d", path) .style("fill", "url(#ocean_fill)");   //graticule svg.append("path")     .datum(graticule)     .attr("class", "graticule")     .attr("d", path);   //load countries d3.json("world-110m.json", function(error, topology) { var land = topojson.object(topology, topology.objects.countries), globe = {type: "sphere"}; svg.insert("path")   .datum(topojson.object(topology, topology.objects.countries))   .attr("class", "land")   .attr("d", path); });   //load earthquakes d3.json("2.5_day.geojson", function(json) {  svg.selectall("path.day")     .data(json.features)     .enter()     .append("path")     .attr("d",path)     .style("fill", "red")         }); //rotate d3.timer(function() { var angle = velocity * (date.now() - then); projection.rotate([angle,0,0]); svg.selectall("path") .attr("d", path);  }); </script>  </body> </html>

and here part of geojson file (just 1 point):

{ type: "featurecollection", metadata: {     generated: 1396609484000,     url: http://...,     title: usgs magnitude,     api: string,     count: integer,     status: integer },  features: [     {         type: "feature",         properties: {             mag: 5.2,             place: 70km sw of iquique, chile,             time: 1396605206040,             updated: 1396606883841,             tz: integer,             url: string,             detail: string,             felt:integer,             cdi: decimal,             mmi: decimal,             alert: string,             status: string,             tsunami: integer,             sig:integer,             net: string,             code: string,             ids: string,             sources: string,             types: string,             nst: integer,             dmin: decimal,             rms: decimal,             gap: decimal,             magtype: string,             type: string         },         geometry: {             type: "point",             coordinates: [                 longitude,                 latitude,                 depth             ]         },         id: string      },     ... ] }

thank time reading , comments.

you can use .pointradius() function of path this:

var path = d3.geo.path()              .projection(projection)              .pointradius(function(d) { return d.properties.mag; });

you may want have scale map data circle sizes, e.g.

var scale = d3.scale.sqrt().domain([minmag, maxmag]).range([2, 10]); // ...   .pointradius(function(d) { return scale(d.properties.mag); });

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