D3 Examples - DVD32015_Module 5 Scatter plot

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Scatterplot</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
        <style type="text/css">
            h1 {
                font-size: 24px;
                margin: 0;
            }
​
            p {
                font-size: 14px;
                margin: 10px 0 0 0;
            }
​
            circle:hover {
                fill: #13B4DE;
            }
            
            .axis path,
            .axis line {
                fill: none;
                stroke: #aaaaaa;
            }
            
            .axis text {
                font-family: sans-serif;
                font-size: 11px;
                fill:#aaaaaa;
            }
​
        </style>
    </head>
    <body>
​
        <h1>The number of CCTV cameras by district in Seoul, Korea</h1>
​
        <p>X axis : The number of cctv cameras <br> Y axis : The population of seoul <br> The text on circle is name of seoul district</p>
​
        <script type="text/javascript">     
​
​
            var w = 900;
            var h = 600;
            var padding = [ 20, 10, 50, 80 ];  //Top, right, bottom, left
​
            var xScale = d3.scale.linear()
                                .range([ padding[3], w - padding[1] - padding[3] ]);
            
            var yScale = d3.scale.linear()
                                .range([ h - padding[2], padding[0]]);
​
            var xAxis = d3.svg.axis()
                            .scale(xScale)
                            .orient("bottom");
​
            var yAxis = d3.svg.axis()
                            .scale(yScale)
                            .orient("left");
​
            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
​
            d3.csv("data.csv", function(data) {
                data.forEach(function(d){
                    d.value=+d.value;
                    d.population=+d.population;
                });
​
                xScale.domain([0,d3.max(data, function(d) {
                        return d.value;
                    })
                ]);
​
                yScale.domain([0, d3.max(data, function(d) {
                        return d.population;
                    })
                ]);
​
                var circles = svg.selectAll("circle")
                                .data(data)
                                .enter()
                                .append("circle");
​
                circles.attr("cx", function(d) {
                        return xScale(d.value);
                    })
                    .attr("cy", function(d) {
                        return yScale(d.population);
                    })
                    .attr("r", 6)
                    .attr("fill", "#02436E");
​
                svg.selectAll(".labeltext")
                   .data(data)
                   .enter()
                   .append("text")
                   .text(function(d) {
                        return d.area;
                   })
                   .attr("x", function(d) {
                        return xScale(d.value);
                   })
                   .attr("y", function(d) {
                        return yScale(d.population)-10;
                   })
                   .attr("font-family", "sans-serif") // 폰트 종류, sans-serif : 고딕 
                   .attr("font-size", "10px") // 폰트 크기 
                   .attr("fill", "#888888") // 텍스트 색상
                   .attr("text-anchor","middle"); // 텍스트 정렬 
​
                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(0," + (h - padding[2] + 10) + ")")
                    .call(xAxis);
​
                svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + (padding[3] - 10) + ",0)")
                    .call(yAxis);
​
            });
        </script>
    </body>
</html>
    