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area.T.draw()"
(see Section 6) is called for the first time, and no canvas is yet
created at that moment. You can thus use you own canvas by creating a
canvas before calling the first area.T.draw(), like below:
You can also achieve the same effect by passing the canvas object to the
area.T.draw() method explicitly:
You can also pass a file object (or file-like object, such as
StringIO) to canvas.init. In this case, you need
to define the output format via the second argument.
fd = file("foo.pdf", "w")
can = canvas.init(fd, "pdf")
...
ar.draw(can)
Naturally, you can write to multiple files by passing multiple
canvas objects to different area.T.draw(). For example,
the below example draws the first chart to graph1.pdf and the next
chart to graph2.pdf.
../demos/twographs.py
from pychart import * can = canvas.init("graph1.pdf") data = chart_data.read_csv("lines.csv") ar = area.T(x_range = (0,100), y_range = (0,100), x_axis = axis.X(label="X", tic_interval=10), y_axis = axis.Y(label="Y", tic_interval=10)) eb = error_bar.error_bar2(tic_len=5, hline_style=line_style.gray50) ar.add_plot(line_plot.T(label="foo", data=data, error_bar=eb, y_error_minus_col=3), line_plot.T(label="bar", data=data, ycol=2, error_bar=eb, y_error_minus_col=3)) ar.draw(can) tb = text_box.T(loc=(40, 130), text="This is\nimportant!", line_style=None) tb.add_arrow((ar.x_pos(data[6][0]), ar.y_pos(data[6][1])), "cb") tb.draw(can) can = canvas.init("graph2.pdf") ar = area.T(loc=(200, 0), x_range=(0,100), y_range=(0,100), x_axis = axis.X(label="X", tic_interval=10), y_axis = axis.Y(label="Y", tic_interval=10)) ar.add_plot(line_plot.T(label="foo", data=data, data_label_format="/8{}%d"), line_plot.T(label="bar", data=data, ycol=2)) ar.draw(can) # Note: can.close() is called automatically for every open canvas.
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