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lineChart.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
"""
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
"""
from .NVD3Chart import NVD3Chart, TemplateMixin
class lineChart(TemplateMixin, NVD3Chart):
"""
A line chart or line graph is a type of chart which displays information
as a series of data points connected by straight line segments.
Python example::
from nvd3 import lineChart
chart = lineChart(name="lineChart", x_is_date=False, x_axis_format="AM_PM")
xdata = range(24)
ydata = [0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 4, 3, 3, 5, 7, 5, 3, 16, 6, 9, 15, 4, 12]
ydata2 = [9, 8, 11, 8, 3, 7, 10, 8, 6, 6, 9, 6, 5, 4, 3, 10, 0, 6, 3, 1, 0, 0, 0, 1]
extra_serie = {"tooltip": {"y_start": "There are ", "y_end": " calls"}}
chart.add_serie(y=ydata, x=xdata, name='sine', extra=extra_serie, **kwargs1)
extra_serie = {"tooltip": {"y_start": "", "y_end": " min"}}
chart.add_serie(y=ydata2, x=xdata, name='cose', extra=extra_serie, **kwargs2)
chart.buildhtml()
Javascript rendered to:
.. raw:: html
<div id="lineChart"><svg style="height:450px; width:100%"></svg></div>
<script>
data_lineChart=[{"values": [{"y": 0, "x": 0}, {"y": 0, "x": 1}, {"y": 1, "x": 2}, {"y": 1, "x": 3}, {"y": 0, "x": 4}, {"y": 0, "x": 5}, {"y": 0, "x": 6}, {"y": 0, "x": 7}, {"y": 1, "x": 8}, {"y": 0, "x": 9}, {"y": 0, "x": 10}, {"y": 4, "x": 11}, {"y": 3, "x": 12}, {"y": 3, "x": 13}, {"y": 5, "x": 14}, {"y": 7, "x": 15}, {"y": 5, "x": 16}, {"y": 3, "x": 17}, {"y": 16, "x": 18}, {"y": 6, "x": 19}, {"y": 9, "x": 20}, {"y": 15, "x": 21}, {"y": 4, "x": 22}, {"y": 12, "x": 23}], "key": "sine", "yAxis": "1"}, {"values": [{"y": 9, "x": 0}, {"y": 8, "x": 1}, {"y": 11, "x": 2}, {"y": 8, "x": 3}, {"y": 3, "x": 4}, {"y": 7, "x": 5}, {"y": 10, "x": 6}, {"y": 8, "x": 7}, {"y": 6, "x": 8}, {"y": 6, "x": 9}, {"y": 9, "x": 10}, {"y": 6, "x": 11}, {"y": 5, "x": 12}, {"y": 4, "x": 13}, {"y": 3, "x": 14}, {"y": 10, "x": 15}, {"y": 0, "x": 16}, {"y": 6, "x": 17}, {"y": 3, "x": 18}, {"y": 1, "x": 19}, {"y": 0, "x": 20}, {"y": 0, "x": 21}, {"y": 0, "x": 22}, {"y": 1, "x": 23}], "key": "cose", "yAxis": "1"}];
nv.addGraph(function() {
var chart = nv.models.lineChart();
chart.margin({top: 30, right: 60, bottom: 20, left: 60});
var datum = data_lineChart;
chart.xAxis
.tickFormat(function(d) { return get_am_pm(parseInt(d)); });
chart.yAxis
.tickFormat(d3.format(',.02f'));
chart.tooltipContent(function(key, y, e, graph) {
var x = String(graph.point.x);
var y = String(graph.point.y);
if(key == 'sine'){
var y = 'There is ' + String(graph.point.y) + ' calls';
}
if(key == 'cose'){
var y = String(graph.point.y) + ' min';
}
tooltip_str = '<center><b>'+key+'</b></center>' + y + ' at ' + x;
return tooltip_str;
});
chart.showLegend(true);
function get_am_pm(d){
if (d > 12) {
d = d - 12; return (String(d) + 'PM');
}
else {
return (String(d) + 'AM');
}
};
d3.select('#lineChart svg')
.datum(datum)
.transition().duration(500)
.attr('height', 200)
.call(chart);
return chart;
});
</script>
See the source code of this page, to see the underlying javascript.
"""
CHART_FILENAME = "./linechart.html"
template_chart_nvd3 = NVD3Chart.template_environment.get_template(CHART_FILENAME)
def __init__(self, **kwargs):
super(lineChart, self).__init__(**kwargs)
self.model = 'lineChart'
height = kwargs.get('height', 450)
width = kwargs.get('width', None)
if kwargs.get('x_is_date', False):
self.set_date_flag(True)
self.create_x_axis('xAxis',
format=kwargs.get('x_axis_format', '%d %b %Y'),
date=True)
self.set_custom_tooltip_flag(True)
else:
if kwargs.get('x_axis_format') == 'AM_PM':
self.x_axis_format = format = 'AM_PM'
else:
format = kwargs.get('x_axis_format', 'r')
self.create_x_axis('xAxis', format=format,
custom_format=kwargs.get('x_custom_format',
False))
self.create_y_axis(
'yAxis',
format=kwargs.get('y_axis_format', '.02f'),
custom_format=kwargs.get('y_custom_format', False))
# must have a specified height, otherwise it superimposes both chars
self.set_graph_height(height)
if width:
self.set_graph_width(width)