<!DOCTYPE html>

<html>

<head lang="en">

    <meta charset="UTF-8">

    <title></title>

    <script src="../bower_components/underscore/underscore-min.js"></script>

    <script src="../ventor/d3.min.js"></script>

    <style type="text/css">

        body {

            padding-top: 50px;

            padding-left: 100px;

        }

        #chartArea {

            width: 400px;

            height: 300px;

            background-color: #CCC;

        }

        .bar {

            display: inline-block;

            width: 20px;

            height: 75px; /* Gets overriden by D3-assigned height below */

            margin-right: 2px;

            /* fill: teal; *//* SVG doesn't have background prop, use fill instead*/

            z-index: 99;

        }

        .bubble {

            display: inline-block;

            fill: purple;

            fill-opacity: 0.5;

            stroke: black;

            stroke-weight: 1px;

        }

        .axis path, .axis line {

            fill: none;

            stroke: #000;

            stroke-width: 1px;

            shape-rendering: crispEdges;

        }

    </style>

</head>

<body>

<section id="chartArea"></section>

<script>

    var dataset = _.map(_.range(30), function(num) {

                return {

                    x: Math.round(Math.random() * 100),

                    y: Math.round(Math.random() * 100),

                    r: Math.round(5 + Math.random() * 10)

                };

            }), //reandom generate 15 data from 1 to 50

            margin = {top: 20, right: 20, bottom: 40, left: 40},

            w = 400 - margin.left - margin.right,

            h = 300 - margin.top - margin.bottom;

    var svg = d3.select('#chartArea').append('svg')

            .attr('width', w + margin.left + margin.right)

            .attr('height', h + margin.top + margin.bottom)

            .append('g') //The last step is to add a G element which is a graphics container in SBG.

            .attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')'); //Then offset that graphic element by our left and top margins.

    var yScale = d3.scale.linear()

            .domain([0, d3.max(dataset, function(d) {

                return d.y; //tell the max function just need to care about y prop

            })])

            .range([h, 0]);

    var yAxis = d3.svg.axis()

            .scale(yScale)

            .orient('left')

            .ticks(10)

            .innerTickSize(10)

            .outerTickSize(10)

            .tickPadding(10);

    svg.append('g')

            .attr('class', 'y axis')

            .attr('transform', 'translate(0,0)')

            .call(yAxis);

    var xScale = d3.scale.linear()

            .domain([0, 100])

            .range([0, w]);

    var xAxis = d3.svg.axis()

            .scale(xScale)

            .orient('bottom')

            .ticks(10)

            .innerTickSize(6)

            .outerTickSize(12)

            .tickPadding(12);

    svg.append('g')

            .attr('class', 'x axis')

            .attr('transform', 'translate(0, ' + h  + ')')

            .call(xAxis);

    svg.selectAll('circle')

            .data(dataset)

            .enter()

            .append('circle')// svg doesn't have div, use rect instead

            .attr('class', "bubble")

            .attr('cx', function(each_data, index) {

                return xScale(each_data.x);

            })

            .attr('cy', function(each_data) {

                return yScale(each_data.y);

            })

            .attr('r', function(each_data, i) {

                return each_data.r;

            });

</script>

<!--

    1. svg should use 'fill' prop instead 'background-color'

    2. svg width & height no need 'px'

    3. attr(function(data_val, index){})

    4. create svg, d3.select('selector').append('svg').attr('width', xxx).attr('height', xx)

    5. svg should use 'rect' instead of 'div'

    -->

</body>

</html>

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