## 1.2 Bar plot

The below program generates this chart.

../demos/bartestv.py

    from pychart import *
    theme.get_options()

    data = [(10, 20, 30, 5), (20, 65, 33, 5), (30, 55, 30, 5), (40, 45, 51, 7),
            (50, 25, 27, 3), (60, 75, 30, 5), (70, 80, 42, 5), (80, 62, 32, 5),
            (90, 42, 39, 5), (100, 32, 39, 4)]

    # The attribute y_coord=... tells that the Y axis values
    # should be taken from samples.
    # In this example, Y values will be [40,50,60,70,80].
    ar = area.T(y_coord = category_coord.T(data[3:8], 0),
                x_grid_style=line_style.gray50_dash1,
                x_grid_interval=20, x_range = (0,100),
                x_axis=axis.X(label="X label"),
                y_axis=axis.Y(label="Y label"),
                bg_style = fill_style.gray90,
                border_line_style = line_style.default,
                legend = legend.T(loc=(80,10)))

    # Below call sets the default attributes for all bar plots.
    chart_object.set_defaults(bar_plot.T, direction="horizontal", data=data)

    # Attribute cluster=(0,3) tells that you are going to draw three bar
    # plots side by side.  The plot labeled "foo" will the leftmost (i.e.,
    # 0th out of 3).  Attribute hcol tells the column from which to
    # retrive sample values from.  It defaults to one.
    ar.add_plot(bar_plot.T(label="foo", cluster=(0,3)))
    ar.add_plot(bar_plot.T(label="bar", hcol=2, cluster=(1,3)))
    ar.add_plot(bar_plot.T(label="baz", hcol=3, cluster=(2,3)))
    ar.draw()