nacyot/putne

// This code based on d3 example(http://bl.ocks.org/mbostock/3885211/).

this.d3_stacked_area_chart = function(selector, data_file){
    var target = d3.select(selector);
    var parentWidth = target[0][0].parentNode.clientWidth;

    var margin = {top: 20, right: 20, bottom: 30, left: 50};
    var width = parentWidth - margin.left - margin.right;
    var height = (parentWidth * 0.45) - margin.top - margin.bottom;

    var parseDate = d3.time.format("%y-%b-%d").parse,
    formatPercent = d3.format(".0%");

    var x = d3.time.scale()
        .range([0, width]);

    var y = d3.scale.linear()
        .range([height, 0]);

    var color = d3.scale.category20();

    var xAxis = d3.svg.axis()
        .scale(x)
        .orient("bottom");

    var yAxis = d3.svg.axis()
        .scale(y)
        .orient("left")
        .tickFormat(formatPercent);

    var area = d3.svg.area()
        .x(function(d) { return x(d.date); })
        .y0(function(d) { return y(d.y0); })
        .y1(function(d) { return y(d.y0 + d.y); });

    var stack = d3.layout.stack()
        .values(function(d) { return d.values; });

    var svg = target.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 + ")");

    d3.tsv(data_file, function(error, data) {
        color.domain(d3.keys(data[0]).filter(function(key) { return key !== "date"; }));

        data.forEach(function(d) {
            d.date = parseDate(d.date);
        });

        var browsers = stack(color.domain().map(function(name) {
            return {
                name: name,
                values: data.map(function(d) {
                    return {date: d.date, y: d[name] / 100};
                })
            };
        }));

        x.domain(d3.extent(data, function(d) { return d.date; }));

        var browser = svg.selectAll(".browser")
            .data(browsers)
            .enter().append("g")
            .attr("class", "browser");

        browser.append("path")
            .attr("class", "area")
            .attr("d", function(d) { return area(d.values); })
            .style("fill", function(d) { return color(d.name); });

        browser.append("text")
            .datum(function(d) { return {name: d.name, value: d.values[d.values.length - 1]}; })
            .attr("transform", function(d) { return "translate(" + x(d.value.date) + "," + y(d.value.y0 + d.value.y / 2) + ")"; })
            .attr("x", -6)
            .attr("dy", ".35em")
            .text(function(d) { return d.name; });

        svg.append("g")
            .attr("class", "x axis")
            .attr("transform", "translate(0," + height + ")")
            .call(xAxis);

        svg.append("g")
            .attr("class", "y axis")
            .call(yAxis);
    });
}