1 # -*- coding: utf-8 -*-
3 # Copyright (C) 2000-2005 by Yasushi Saito (yasushi.saito@gmail.com)
5 # Jockey is free software; you can redistribute it and/or modify it
6 # under the terms of the GNU General Public License as published by the
7 # Free Software Foundation; either version 2, or (at your option) any
10 # Jockey is distributed in the hope that it will be useful, but WITHOUT
11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 def get_canvas_pos(self, size, val, min, max):
18 Compute the screen location at which a sample value would be drawn.
19 ``size`` is the width or height of the chart, in points.
20 ``val`` is the sample value.
21 ``min`` and ``max`` are the minimum and maximum sample values that
22 are to be displayed over the length of ``size``.
24 For example, suppose the width of a chart is 200 points and the
25 minimum and maximum X values in the sample data are 100 and 150
26 respectively. When Pychart wants to draw a sample point at the X
27 value of 120, it will call
28 area.T.x_coord.get_canvas_pos(size = 200, val = 120, min = 100, max = 150).
32 def get_tics(self, min, max, interval):
33 """Generate the list of places for drawing tick marks."""
36 def get_min_max(self, min, max, interval):
37 """Compute the min/max values to be displayed in the chart.
38 Parameters ``min`` and ``max`` are the minimum and maximum values
39 of the sample data passed to the plots. Parameter ``interval`` is
40 the value of attribute area.T.x_grid_interval (or y_grid_interval).
41 It is None if these attributes are non-specified.
43 This method must return tuple (dmin, dmax, dinterval).
44 dmin should be ``min`` rounded down to some good number.
45 dmax should be ``max`` rounded up to some good number.
46 dinterval should be ``interval`` if it is non-None. Otherwise, the
47 method must compute some good value.