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March 16, 2017 22:59
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Homework 6 (Another way to do it)
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| license: mit |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .chart rect { | |
| fill: seagreen; | |
| } | |
| .legend { | |
| font: 10px sans-serif; | |
| } | |
| body { | |
| font: 12px sans-serif; | |
| font-weight: bold; | |
| } | |
| path { | |
| stroke:steelblue; | |
| stroke-width: 2; | |
| fill: none; | |
| } | |
| .axis text { | |
| font: 10px sans-serif; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| .chart text { | |
| font: 12px sans-serif; | |
| } | |
| .dot { | |
| stroke: #000; | |
| } | |
| </style> | |
| <body> | |
| <svg class = "chart"></svg> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var quakes; //global variable | |
| var url = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_day.geojson"; | |
| var margin = {top: 20, right: 30, bottom: 40, left: 40}, | |
| width = 960 - margin.left - margin.right, | |
| height = 520 - margin.top - margin.bottom; | |
| var x = d3.scale.linear() | |
| .range([0, width]) | |
| var y = d3.scale.linear() | |
| .range([height, 0]); | |
| //Line generator | |
| var line = d3.svg.line() | |
| .x(function(d) { return x(d.x); }) | |
| .y(function(d) { return y(d.y); }); | |
| //Set colors based on 10 colors | |
| var color = d3.scale.category10(); | |
| var xAxis = d3.svg.axis() | |
| .scale(x) | |
| //.tickValues ([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) | |
| .orient("bottom"); | |
| var yAxis = d3.svg.axis() | |
| .scale(y) | |
| .orient("left") | |
| var chart = d3.select(".chart")//.append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| //svg.call(tip); | |
| d3.json(url, function(error, data) { | |
| if (error) console.log(error); | |
| console.log("Data from USGS:", data); | |
| quakes = data | |
| quakesMag = []; | |
| quakesMag = data.features.map(function(d) { return d.properties.mag; }); | |
| console.log("Earthquake Magnitude:", quakesMag); | |
| quakesBin = []; // empty array to bin the mag values | |
| for (var i = 0; i < 10; i++) { | |
| quakesBin[i] = quakesMag.filter(function(d) { return d >= i && d < i + 1;}).length; | |
| } | |
| x.domain([0, quakesBin.length]); | |
| y.domain([d3.min(quakesBin, function(d) { return d; }), d3.max (quakesBin, function (d) { return d; })]); | |
| //y.domain(d3.extent(quakesBin)); | |
| //var barWith = width / quakesMag.length; | |
| //Create x axis | |
| chart.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(xAxis); | |
| //Append title for the Legend | |
| chart.append("text") | |
| .attr("class", "label") | |
| .attr("x", width) | |
| .attr("y", -7) | |
| .style("text-anchor", "end") | |
| .text("Legend"); | |
| //Create x axis | |
| chart.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(xAxis); | |
| //Append for x axis label | |
| chart.append("text") | |
| .attr("text-anchor", "middle") | |
| .attr("x", width/2) | |
| .attr("y", height + 27) | |
| .text("Earthquake Magnitude"); | |
| //Create y axis | |
| chart.append("g") | |
| .attr("class", "y axis") | |
| .call(yAxis); | |
| //Append for y axis label | |
| chart.append("text") | |
| .attr("transform", "rotate(-90)") | |
| .attr("x", -height/2) | |
| .attr("y", -1 - margin.left/3) | |
| .attr("dy", "-1.2em") | |
| .attr("text-anchor", "middle") | |
| .text("Earthquake Frequency"); | |
| //Append for the Title | |
| chart.append("text") | |
| .attr("text-anchor", "middle") | |
| .attr("x", width/2) | |
| .attr("y", -margin.top/2) | |
| .attr("dy", ".5em") | |
| .text("Earthquake Occurences - Last 2.5 Days"); | |
| //Plot the dots | |
| chart.selectAll(".dot") | |
| .data(quakesBin) | |
| .enter().append("circle") | |
| .attr("class", "dot") | |
| .attr("r", 4) //Radius of 4 | |
| .attr("cx", function(d, i) { return x(i); }) | |
| .attr("cy", function(d) { return y(d); }) | |
| //.attr("height", function(d) { return height - y(d); }) | |
| //.attr("width", barWith) | |
| .style("fill", function(d) { return color(d); }); | |
| //Create Legend | |
| var legend = chart.selectAll(".legend") | |
| .data(color.domain()) | |
| .enter().append("g") | |
| .attr("class", "legend") | |
| .attr("transform", function(d, i) { return "translate (0, " + i * 20 + ")"; }); | |
| //Append Legend | |
| legend.append("rect") | |
| .attr("x", width - 20) | |
| .attr("width", 20) | |
| .attr("height", 20) | |
| .style("fill", color); | |
| //Append label for frequency | |
| legend.append("text") | |
| .attr("x", width - 24) | |
| .attr("y", 9) | |
| .attr("dy", ".35em") | |
| .style("text-anchor", "end") | |
| .text(function(d) { return d; }) | |
| // Create an array of objects that will be plotted as a line | |
| var lineData = quakesBin.map(function(d, i) { | |
| var obj = {}; | |
| obj.x = i; | |
| obj.y = d; | |
| return obj; | |
| }); | |
| //Plot the data line | |
| chart.append("path") | |
| .datum(lineData) | |
| .attr("class", "line") | |
| .attr("d", line); | |
| }); | |
| </script> |
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