Drawing Charts with Python & Qt4

Back again with some graphics stuff that can be useful in monitoring applications.
As you can immagine, this charts are 100% QPainter. The source code is available on blog-code@github.

Pie Chart

table = DataTable()
table.addColumn('Lang')
table.addColumn('Rating')
table.addRow(['Java', 17.874])
table.addRow(['C', 17.322])
table.addRow(['C++', 8.084])
table.addRow(['C#', 7.319])
table.addRow(['PHP', 6.096])

chart = PieChart(table)
chart.save('pie.png', QSize(240, 240), legend_width=100)

The usage is really simple, you have to create your table with columns and data, create a chart object using the table that you've created and you can call the draw() or save() method to show/save the chart somewhere.

Scattered Chart

chart = ScatterChart(table)
chart.haxis_title = 'Proc input'
chart.haxis_vmin = 0
chart.haxis_vmax = 16
chart.haxis_step = 2
chart.vaxis_title = 'Quality'
chart.vaxis_vmin = 90
chart.vaxis_vmax = 104
chart.vaxis_step = 1

You can customize the min/max value and the step of horizontal and vertical axis, ore you can use the default calculated on your data. You can also set the Reference column with setHorizontalAxisColumn() or setVerticalAxisColumn().

Area Chart

table = DataTable()
table.addColumn('Time')
table.addColumn('Site 1')
table.addColumn('Site 2')
table.addRow([ 4.00, 120,   500])
table.addRow([ 6.00, 270,   460])
table.addRow([ 8.30, 1260, 1120])
table.addRow([10.15, 2030,  540])
table.addRow([12.00,  520,  890])
table.addRow([18.20, 1862, 1500])

chart = AreaChart(table)
chart.setHorizontalAxisColumn(0)
chart.haxis_title = 'Time'
chart.haxis_vmin = 0.0
chart.haxis_vmax = 20.0
chart.haxis_step = 5

chart.save('area.png', QSize(400, 240), legend_width=100)

Line Chart

chart = LineChart(table)
chart.setHorizontalAxisColumn(0)
chart.haxis_title = 'Time'
chart.haxis_vmin = 0.0
chart.haxis_vmax = 20.0
chart.haxis_step = 2

Once again, the code is available on github at blog-code/qt4-charts/chart.py.