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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<head> |
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<style> |
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.bar{ |
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fill: steelblue; |
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} |
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.bar:hover{ |
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fill: brown; |
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} |
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.axis { |
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font: 10px 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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.tooltip { |
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position: absolute; |
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width: 150px; |
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height: 35px; |
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text-align: center; |
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pointer-events: none; |
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background-color: rgba(0,0,0,0.8); |
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color: #FFFFFF; |
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} |
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</style> |
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</head> |
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<body> |
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<script src="http://d3js.org/d3.v3.min.js"></script> |
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<script> |
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// set the dimensions of the canvas |
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var margin = {top: 20, right: 20, bottom: 70, left: 40}, |
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width = 600 - margin.left - margin.right, |
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height = 300 - margin.top - margin.bottom; |
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// set the ranges |
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var x = d3.scale.ordinal().rangeRoundBands([0, width], 0.05); |
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var y = d3.scale.linear().range([height, 0]); |
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// define the axis |
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var xAxis = d3.svg.axis() |
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.scale(x) |
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.orient("bottom") |
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var yAxis = d3.svg.axis() |
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.scale(y) |
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.orient("left") |
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.ticks(10); |
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var tooltip = d3.select("body").append("div") |
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.attr("class", "tooltip"); |
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// add the SVG element |
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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", |
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"translate(" + margin.left + "," + margin.top + ")"); |
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// load the data |
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d3.json("data.json", function(error, data) { |
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data.forEach(function(d) { |
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d.code = d.code; |
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d.grade = +d.grade; |
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}); |
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// scale the range of the data |
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x.domain(data.map(function(d) { return d.code; })); |
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y.domain([0, d3.max(data, function(d) { return d.grade; })]); |
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// add 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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.selectAll("text") |
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.style("text-anchor", "end") |
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.attr("dx", "-.8em") |
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.attr("dy", "-.55em") |
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.attr("transform", "rotate(-90)" ); |
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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("transform", "rotate(-90)") |
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.attr("y", 5) |
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.attr("dy", ".71em") |
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.style("text-anchor", "end") |
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.text("grade"); |
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// Add bar chart |
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svg.selectAll("circle") |
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.data(data) |
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.enter().append("circle") |
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.attr("cx", function (d) { return 10+x(d.code); }) |
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.attr("cy", function (d) { return y(d.grade); }) |
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.attr("r", function (d) { return 2+d.grade }) |
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.style("fill", "red") |
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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("Cod. "+d.code + "<br/> Grade(" + d.grade + ")") |
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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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/**svg.selectAll("bar") |
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.data(data) |
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.enter().append("rect") |
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.attr("class", "bar") |
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.attr("x", function(d) { return x(d.code); }) |
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.attr("width", x.rangeBand()) |
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.attr("y", function(d) { return y(d.grade); }) |
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.attr("height", function(d) { return height - y(d.grade); });**/ |
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}); |
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</script> |
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</body> |
