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