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February 4, 2019 21:27
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| license: mit |
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| <!DOCTYPE html> | |
| <html> | |
| <meta charset="utf-8"> | |
| <!-- Example based on http://bl.ocks.org/mbostock/3887118 --> | |
| <!-- Tooltip example from http://www.d3noob.org/2013/01/adding-tooltips-to-d3js-graph.html --> | |
| <!-- Coding style based on http://gist.github.com/mbostock/5977197 --> | |
| <style> | |
| body { | |
| font: 11px sans-serif; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| .dot { | |
| stroke: #000; | |
| } | |
| .tooltip { | |
| position: absolute; | |
| width: 200px; | |
| height: 28px; | |
| pointer-events: none; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var margin = {top: 20, right: 20, bottom: 30, left: 40}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| /* | |
| * value accessor - returns the value to encode for a given data object. | |
| * scale - maps value to a visual display encoding, such as a pixel position. | |
| * map function - maps from data value to display value | |
| * axis - sets up axis | |
| */ | |
| // setup x | |
| var xValue = function(d) { return d.Calories;}, // data -> value | |
| xScale = d3.scale.linear().range([0, width]), // value -> display | |
| xMap = function(d) { return xScale(xValue(d));}, // data -> display | |
| xAxis = d3.svg.axis().scale(xScale).orient("bottom"); | |
| // setup y | |
| var yValue = function(d) { return d["Protein (g)"];}, // data -> value | |
| yScale = d3.scale.linear().range([height, 0]), // value -> display | |
| yMap = function(d) { return yScale(yValue(d));}, // data -> display | |
| yAxis = d3.svg.axis().scale(yScale).orient("left"); | |
| // setup fill color | |
| var cValue = function(d) { return d.Manufacturer;}, | |
| color = d3.scale.category10(); | |
| // add the graph canvas to the body of the webpage | |
| var svg = d3.select("body").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 + ")"); | |
| // add the tooltip area to the webpage | |
| var tooltip = d3.select("body").append("div") | |
| .attr("class", "tooltip") | |
| .style("opacity", 0); | |
| // load data | |
| d3.csv("cereal.csv", function(error, data) { | |
| // change string (from CSV) into number format | |
| data.forEach(function(d) { | |
| d.Calories = +d.Calories; | |
| d["Protein (g)"] = +d["Protein (g)"]; | |
| // console.log(d); | |
| }); | |
| // don't want dots overlapping axis, so add in buffer to data domain | |
| xScale.domain([d3.min(data, xValue)-1, d3.max(data, xValue)+1]); | |
| yScale.domain([d3.min(data, yValue)-1, d3.max(data, yValue)+1]); | |
| // x-axis | |
| svg.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(xAxis) | |
| .append("text") | |
| .attr("class", "label") | |
| .attr("x", width) | |
| .attr("y", -6) | |
| .style("text-anchor", "end") | |
| .text("Calories"); | |
| // y-axis | |
| svg.append("g") | |
| .attr("class", "y axis") | |
| .call(yAxis) | |
| .append("text") | |
| .attr("class", "label") | |
| .attr("transform", "rotate(-90)") | |
| .attr("y", 6) | |
| .attr("dy", ".71em") | |
| .style("text-anchor", "end") | |
| .text("Protein (g)"); | |
| // draw dots | |
| svg.selectAll(".dot") | |
| .data(data) | |
| .enter().append("circle") | |
| .attr("class", "dot") | |
| .attr("r", 3.5) | |
| .attr("cx", xMap) | |
| .attr("cy", yMap) | |
| .style("fill", function(d) { return color(cValue(d));}) | |
| .on("mouseover", function(d) { | |
| tooltip.transition() | |
| .duration(200) | |
| .style("opacity", .9); | |
| tooltip.html(d["Cereal Name"] + "<br/> (" + xValue(d) | |
| + ", " + yValue(d) + ")") | |
| .style("left", (d3.event.pageX + 5) + "px") | |
| .style("top", (d3.event.pageY - 28) + "px"); | |
| }) | |
| .on("mouseout", function(d) { | |
| tooltip.transition() | |
| .duration(500) | |
| .style("opacity", 0); | |
| }); | |
| // draw legend | |
| var legend = svg.selectAll(".legend") | |
| .data(color.domain()) | |
| .enter().append("g") | |
| .attr("class", "legend") | |
| .attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; }); | |
| // draw legend colored rectangles | |
| legend.append("rect") | |
| .attr("x", width - 18) | |
| .attr("width", 18) | |
| .attr("height", 18) | |
| .style("fill", color); | |
| // draw legend text | |
| legend.append("text") | |
| .attr("x", width - 24) | |
| .attr("y", 9) | |
| .attr("dy", ".35em") | |
| .style("text-anchor", "end") | |
| .text(function(d) { return d;}) | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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