50 lines
2.2 KiB
Python
50 lines
2.2 KiB
Python
#
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# Copyright (C) 2000-2005 by Yasushi Saito (yasushi.saito@gmail.com)
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#
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# Jockey is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 2, or (at your option) any
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# later version.
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#
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# Jockey is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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# for more details.
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#
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class T(object):
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def get_canvas_pos(self, size, val, min, max):
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"""
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Compute the screen location at which a sample value would be drawn.
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``size`` is the width or height of the chart, in points.
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``val`` is the sample value.
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``min`` and ``max`` are the minimum and maximum sample values that
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are to be displayed over the length of ``size``.
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For example, suppose the width of a chart is 200 points and the
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minimum and maximum X values in the sample data are 100 and 150
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respectively. When Pychart wants to draw a sample point at the X
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value of 120, it will call
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area.T.x_coord.get_canvas_pos(size = 200, val = 120, min = 100, max = 150).
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"""
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raise Exception
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def get_tics(self, min, max, interval):
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"""Generate the list of places for drawing tick marks."""
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raise Exception
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def get_min_max(self, min, max, interval):
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"""Compute the min/max values to be displayed in the chart.
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Parameters ``min`` and ``max`` are the minimum and maximum values
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of the sample data passed to the plots. Parameter ``interval`` is
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the value of attribute area.T.x_grid_interval (or y_grid_interval).
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It is None if these attributes are non-specified.
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This method must return tuple (dmin, dmax, dinterval).
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dmin should be ``min`` rounded down to some good number.
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dmax should be ``max`` rounded up to some good number.
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dinterval should be ``interval`` if it is non-None. Otherwise, the
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method must compute some good value.
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"""
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raise Exception
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