Python-nvd3 is a Python wrapper for NVD3 graph library. NVD3 is an attempt to build re-usable charts and chart components for d3.js without taking away the power that d3.js gives you.

Project location : https://github.com/areski/python-nvd3

cumulativeLineChart

class nvd3.cumulativeLineChart.cumulativeLineChart(**kwargs)

A cumulative line chart is used when you have one important grouping representing an ordered set of data and one value to show, summed over time.

Python example:

from nvd3 import cumulativeLineChart
chart = cumulativeLineChart(name='cumulativeLineChart', x_is_date=True)
xdata = [1365026400000000, 1365026500000000, 1365026600000000]
ydata = [-6, 5, -1]
y2data = [36, 55, 11]

extra_serie = {"tooltip": {"y_start": "There are ", "y_end": " calls"}}
chart.add_serie(name="Serie 1", y=ydata, x=xdata, extra=extra_serie)

extra_serie = {"tooltip": {"y_start": "", "y_end": " mins"}}
chart.add_serie(name="Serie 2", y=y2data, x=xdata, extra=extra_serie)
chart.buildhtml()

Javascript generated:

data_lineWithFocusChart = [
    {
       "key" : "Serie 1",
       "values" : [
            { "x" : "1365026400000000",
              "y" : -6
            },
            { "x" : "1365026500000000",
              "y" : -5
            },
            { "x" : "1365026600000000",
              "y" : -1
            },
          ],
    },
    {
       "key" : "Serie 2",
       "values" : [
            { "x" : "1365026400000000",
              "y" : 34
            },
            { "x" : "1365026500000000",
              "y" : 56
            },
            { "x" : "1365026600000000",
              "y" : 32
            },
          ],
    }
]

nv.addGraph(function() {
    var chart = nv.models.cumulativeLineChart();

    chart.xAxis
        .tickFormat(function(d) { return d3.time.format('%d %b %Y')(new Date(d)) });
    chart.y1Axis
        .tickFormat(d3.format('.1%'));
    chart.tooltipContent(function(key, y, e, graph) {
        var x = d3.time.format('%d %b %Y')(new Date(parseInt(graph.point.x)));
        var y = String(graph.point.y);
        if(key == 'Serie 1'){
            var y = 'There are ' + String(e)  + ' calls';
        }
        if(key == 'Serie 2'){
            var y =  String(e)  + ' mins';
        }
        tooltip_str = '<center><b>'+key+'</b></center>' + y + ' on ' + x;
        return tooltip_str;
    });
    d3.select('#cumulativeLineChart svg')
        .datum(data_linePlusBarChart)
        .transition().duration(500)
        .attr('height', 350)
        .call(chart);
    return chart;
});