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# Copyright (c) 2003 by Intevation GmbH |
# -*- encoding: iso-8859-1 -*- |
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# |
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# Copyright (c) 2003-2004 by Intevation GmbH |
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# Authors: |
# Authors: |
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# Jonathan Coles <[email protected]> |
# Jan-Oliver Wagner <[email protected]> (2004) |
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# Bernhard Herzog <[email protected]> (2003) |
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# Thomas K�ster <[email protected]> (2003) |
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# Jonathan Coles <[email protected]> (2003) |
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# |
# |
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# This program is free software under the GPL (>=v2) |
# This program is free software under the GPL (>=v2) |
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# Read the file COPYING coming with Thuban for details. |
# Read the file COPYING coming with Thuban for details. |
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""" |
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Functions to generate Classifications |
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""" |
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__version__ = "$Revision$" |
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# $Source$ |
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# $Id$ |
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import operator |
import operator |
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from color import Color |
from color import Color, Transparent |
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from range import Range |
from range import Range |
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from classification import Classification, ClassGroupSingleton, \ |
from classification import Classification, ClassGroupSingleton, \ |
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ClassGroupRange, ClassGroupProperties |
ClassGroupRange, ClassGroupProperties |
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class ClassGenerator: |
def generate_singletons(_list, ramp): |
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"""Generate a new classification consisting solely of singletons. |
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def GenSingletonsFromList(self, _list, numGroups, ramp): |
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"""Generate a new classification consisting solely of singletons. |
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The resulting classification will consist of at most 'numGroups' |
The resulting classification will consist of one group for each |
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groups whose group properties ramp between 'prop1' and 'prop2'. There |
item in _list whose properties ramp between 'prop1' and 'prop2'. |
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could be fewer groups if '_list' contains fewer that 'numGroups' items. |
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_list -- any object that implements the iterator interface |
_list -- a list of values for each singleton |
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numGroups -- how many groups to generate. This can not be |
ramp -- an object which implements the CustomRamp interface |
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determined while the classification is being |
""" |
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generated because the stepping values must |
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be precalculated to ramp between prop1 and prop2. |
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ramp -- an object which implements the CustomRamp interface |
clazz = Classification() |
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""" |
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clazz = Classification() |
i = 0 |
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if numGroups == 0: return clazz |
maxValue = float(len(_list) - 1) |
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if maxValue < 1: maxValue = 1 |
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ramp.SetNumGroups(numGroups) |
for value in _list: |
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prop = ramp.GetProperties(i / maxValue) |
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clazz.AppendGroup(ClassGroupSingleton(value, prop)) |
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i += 1 |
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for value, prop in zip(_list, ramp): |
return clazz |
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clazz.AppendGroup(ClassGroupSingleton(value, prop)) |
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return clazz |
def generate_uniform_distribution(min, max, numGroups, ramp, intStep = False): |
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"""Generate a classification with numGroups range groups |
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each with the same interval. |
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def GenSingletons(self, min, max, numGroups, ramp): |
intStep -- force the calculated stepping to an integer. |
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Useful if the values are integers but the |
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number of groups specified doesn't evenly |
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divide (max - min). |
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""" |
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clazz = Classification() |
clazz = Classification() |
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#step = int((max - min) / float(numGroups)) |
cur_min = min |
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if numGroups > 0: |
end = "[" |
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maxValue = float(numGroups - 1) |
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if maxValue < 1: maxValue = 1 |
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step = int((max - min + 1) / float(numGroups)) |
for i in range(1, numGroups + 1): |
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cur_value = min |
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ramp.SetNumGroups(numGroups) |
prop = ramp.GetProperties(float(i-1) / maxValue) |
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for prop in ramp: |
if intStep: |
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clazz.AppendGroup(ClassGroupSingleton(cur_value), prop) |
cur_max = min + int(round((i * (max - min + 1)) / float(numGroups))) |
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cur_value += step |
else: |
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cur_max = min + (i * (max - min)) / float(numGroups) |
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return clazz |
if i == numGroups: |
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cur_max = max |
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end = "]" |
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def GenUniformDistribution(self, min, max, numGroups, |
if cur_min == cur_max: |
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ramp, intStep = False): |
_range = Range(("[", cur_min, cur_max, "]")) |
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"""Generate a classification with numGroups range groups |
else: |
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each with the same interval. |
_range = Range(("[", cur_min, cur_max, end)) |
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intStep -- force the calculated stepping to an integer. |
clazz.AppendGroup(ClassGroupRange(_range, prop)) |
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Useful if the values are integers but the |
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number of groups specified doesn't evenly |
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divide (max - min). |
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""" |
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clazz = Classification() |
cur_min = cur_max |
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if numGroups == 0: return clazz |
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ramp.SetNumGroups(numGroups) |
return clazz |
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step = (max - min) / float(numGroups) |
def generate_quantiles(_list, percents, ramp, _range): |
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"""Generates a Classification which has groups of ranges that |
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represent quantiles of _list at the percentages given in percents. |
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Only the values that fall within _range are considered. |
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if intStep: |
Returns a tuple (adjusted, Classification) where adjusted is |
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step = int(step) |
True if the Classification does not exactly represent the given |
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range, or if the Classification is empty. |
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cur_min = min |
_list -- a sort list of values |
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cur_max = cur_min + step |
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i = 0 |
percents -- a sorted list of floats in the range 0.0-1.0 which |
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end = "[" |
represent the upper bound of each quantile. the |
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for prop in ramp: |
union of all percentiles should be the entire |
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range from 0.0-1.0 |
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if i == (numGroups - 1): |
ramp -- an object which implements the CustomRamp interface |
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cur_max = max |
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end = "]" |
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_range -- a Range object |
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# this check guards against rounding issues |
Raises a Value Error if 'percents' has fewer than two items, or |
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if cur_min != cur_max: |
does not cover the entire range. |
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range = Range("[" + str(float(cur_min)) + ";" + |
""" |
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str(float(cur_max)) + end) |
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clazz.AppendGroup(ClassGroupRange(range, None, prop)) |
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cur_min = cur_max |
clazz = Classification() |
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cur_max += step |
quantiles = calculate_quantiles(_list, percents, _range) |
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i += 1 |
adjusted = True |
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return clazz |
if quantiles is not None: |
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numGroups = len(quantiles[3]) |
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def GenQuantiles(self, _list, percents, ramp, _range): |
if numGroups != 0: |
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"""Generates a Classification which has groups of ranges that |
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represent quantiles of _list at the percentages given in percents. |
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Only the values that fall within _range are considered. |
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Returns a tuple (adjusted, Classification) where adjusted is |
adjusted = quantiles[0] |
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True if the Classification does not exactly represent the given |
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range, or if the Classification is empty. |
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_list -- a sort list of values |
start, min, endMax, right = _range.GetRange() |
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percents -- a sorted list of floats in the range 0.0-1.0 which |
oldp = 0 |
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represent the upper bound of each quantile |
i = 1 |
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end = "]" |
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ramp -- an object which implements the CustomRamp interface |
maxValue = float(numGroups - 1) |
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if maxValue < 1: maxValue = 1 |
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for (q, p) in quantiles[3]: |
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_range -- a Range object |
prop = ramp.GetProperties(float(i-1) / maxValue) |
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""" |
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clazz = Classification() |
if i == numGroups: |
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quantiles = self.CalculateQuantiles(_list, percents, _range) |
max = endMax |
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adjusted = True |
end = right |
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else: |
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max = _list[q] |
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if quantiles is not None: |
group = ClassGroupRange(Range((start, min, max, end)), prop) |
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numGroups = len(quantiles[3]) |
group.SetLabel("%s%% - %s%%" % (round(oldp*100, 2), |
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round(p*100, 2))) |
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oldp = p |
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start = "]" |
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min = max |
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clazz.AppendGroup(group) |
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i += 1 |
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if numGroups != 0: |
return (adjusted, clazz) |
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adjusted = quantiles[0] |
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ramp.SetNumGroups(numGroups) |
def calculate_quantiles(_list, percents, _range): |
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"""Calculate quantiles for the given _list of percents from the |
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sorted list of values that are in range. |
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start, min, endMax, right = _range.GetRange() |
This may not actually generate len(percents) quantiles if |
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many of the values that fall on quantile borders are the same. |
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oldp = 0 |
Returns a tuple of the form: |
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i = 1 |
(adjusted, minIndex, maxIndex, [quantile_list]) |
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end = "]" |
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for (q, p), prop in zip(quantiles[3], ramp): |
where adjusted is True if the the quantile percentages differ from |
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if i == numGroups: |
those supplied, minIndex is the index into _list where the |
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max = endMax |
minimum value used is located, maxIndex is the index into _list |
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end = right |
where the maximum value used is located, and quantile_list is a |
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else: |
list of tuples of the form: (list_index, quantile_percentage) |
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max = _list[q] |
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group = ClassGroupRange(Range((start, min, max, end)), |
Returns None, if no quantiles could be generated based on the |
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None, prop) |
given range or input list. |
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group.SetLabel("%s%% - %s%%" % (round(oldp*100, 2), |
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round(p*100, 2))) |
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oldp = p |
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start = "]" |
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min = max |
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clazz.AppendGroup(group) |
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i += 1 |
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return (adjusted, clazz) |
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def CalculateQuantiles(self, _list, percents, _range): |
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"""Calculate quantiles for the given _list of percents from the |
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sorted list of values that are in range. |
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This may not actually generate len(percents) quantiles if |
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many of the values that fall on quantile borders are the same. |
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Returns a tuple of the form: |
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(adjusted, minIndex, maxIndex, [quantile_list]) |
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where adjusted is True if the the quantile percentages differ from |
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those supplied, minIndex is the index into _list where the |
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minimum value used is located, maxIndex is the index into _list |
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where the maximum value used is located, and quantile_list is a |
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list of tuples of the form: (list_index, quantile_percentage) |
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Returns None, if no quantiles could be generated based on the |
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given range or input list. |
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_list -- a sort list of values |
_list -- a sort list of values |
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percents -- a sorted list of floats in the range 0.0-1.0 which |
percents -- a sorted list of floats in the range 0.0-1.0 which |
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represent the upper bound of each quantile |
represent the upper bound of each quantile. the |
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union of all percentiles should be the entire |
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range from 0.0-1.0 |
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_range -- a Range object |
_range -- a Range object |
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""" |
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quantiles = [] |
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adjusted = False |
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if len(percents) != 0: |
Raises a Value Error if 'percents' has fewer than two items, or |
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does not cover the entire range. |
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# |
""" |
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# find what part of the _list range covers |
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# |
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minIndex = -1 |
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maxIndex = -2 |
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for i in xrange(0, len(_list), 1): |
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if operator.contains(_range, _list[i]): |
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minIndex = i |
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break |
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for i in xrange(len(_list)-1, -1, -1): |
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if operator.contains(_range, _list[i]): |
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maxIndex = i |
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break |
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numValues = maxIndex - minIndex + 1 |
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if numValues > 0: |
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# |
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# build a list of unique indices into list of where each |
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# quantile *should* be. set adjusted if the resulting |
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# indices are different |
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# |
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quantiles = {} |
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for p in percents: |
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index = min(minIndex + int(p*numValues)-1, maxIndex) |
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adjusted = adjusted \ |
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or quantiles.has_key(index) \ |
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or ((index - minIndex + 1) / float(numValues)) != p |
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quantiles[index] = 0 |
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quantiles = quantiles.keys() |
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quantiles.sort() |
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# |
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# the current quantile index must be strictly greater than |
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# the lowerBound |
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# |
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lowerBound = minIndex - 1 |
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for qindex in xrange(len(quantiles)): |
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if lowerBound >= maxIndex: |
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# discard higher quantiles |
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quantiles = quantiles[:qindex] |
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break |
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# lowerBound + 1 is always a valid index |
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# |
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# bump up the current quantile index to be a usable index |
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# if it currently falls below the lowerBound |
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# |
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if quantiles[qindex] <= lowerBound: |
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quantiles[qindex] = lowerBound + 1 |
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listIndex = quantiles[qindex] |
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value = _list[listIndex] |
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# |
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# look for similar values around the quantile index |
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# |
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lindex = listIndex - 1 |
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while lindex > lowerBound and value == _list[lindex]: |
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lindex -= 1 |
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lcount = (listIndex - 1) - lindex |
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rindex = listIndex + 1 |
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while rindex < maxIndex + 1 and value == _list[rindex]: |
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rindex += 1 |
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rcount = (listIndex + 1) - rindex |
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# |
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# adjust the current quantile index based on how many |
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# numbers in the _list are the same as the current value |
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# |
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newIndex = listIndex |
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if lcount == rcount: |
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if lcount != 0: |
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# |
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# there are an equal number of numbers to the left |
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# and right, try going to the left first unless |
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# doing so creates an empty quantile. |
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# |
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if lindex != lowerBound: |
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newIndex = lindex |
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else: |
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newIndex = rindex - 1 |
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elif lcount < rcount: |
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# there are fewer items to the left, so |
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# try going to the left first unless |
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# doing so creates an empty quantile. |
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if lindex != lowerBound: |
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newIndex = lindex |
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else: |
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newIndex = rindex - 1 |
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elif rcount < lcount: |
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# there are fewer items to the right, so go to the right |
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newIndex = rindex - 1 |
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adjusted = adjusted or newIndex != listIndex |
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quantiles[qindex] = newIndex |
quantiles = [] |
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lowerBound = quantiles[qindex] |
adjusted = False |
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# |
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# since quantiles is only set if the code is at least a little |
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# successful, an empty list will be generated in the case that |
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# we fail to get to the real body of the algorithm |
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# |
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if len(quantiles) == 0: |
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return None |
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else: |
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return (adjusted, minIndex, maxIndex, |
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[(q, (q - minIndex+1) / float(numValues)) \ |
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for q in quantiles]) |
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CLR = 0 |
if len(percents) <= 1: |
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STEP = 1 |
raise ValueError("percents parameter must have more than one item") |
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class CustomRamp: |
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def __init__(self, prop1, prop2): |
if percents[-1] != 1.0: |
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self.prop1 = prop1 |
raise ValueError("percents does not cover the entire range") |
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self.prop2 = prop2 |
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self.count = 0 |
# |
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# find what part of the _list range covers |
204 |
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# |
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minIndex = -1 |
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maxIndex = -2 |
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for i in xrange(0, len(_list), 1): |
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if operator.contains(_range, _list[i]): |
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minIndex = i |
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break |
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def __iter__(self): |
for i in xrange(len(_list)-1, -1, -1): |
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return self |
if operator.contains(_range, _list[i]): |
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maxIndex = i |
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break |
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def GetRamp(self): |
numValues = maxIndex - minIndex + 1 |
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return self |
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def SetNumGroups(self, num): |
if numValues > 0: |
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if num <= 0: |
# |
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return False |
# build a list of unique indices into list of where each |
223 |
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# quantile *should* be. set adjusted if the resulting |
224 |
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# indices are different |
225 |
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# |
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quantiles = {} |
227 |
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for p in percents: |
228 |
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index = min(minIndex + int(p*numValues)-1, maxIndex) |
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adjusted = adjusted \ |
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or quantiles.has_key(index) \ |
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or ((index - minIndex + 1) / float(numValues)) != p |
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self.count = int(num) |
quantiles[index] = 0 |
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num = float(num) |
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prop1 = self.prop1 |
quantiles = quantiles.keys() |
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prop2 = self.prop2 |
quantiles.sort() |
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clr = prop1.GetLineColor() |
# |
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lineColor2 = prop2.GetLineColor() |
# the current quantile index must be strictly greater than |
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# the lowerBound |
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self.noLine = clr is not Color.Transparent \ |
# |
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and lineColor2 is not Color.Transparent |
lowerBound = minIndex - 1 |
244 |
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245 |
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for qindex in xrange(len(quantiles)): |
246 |
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if lowerBound >= maxIndex: |
247 |
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# discard higher quantiles |
248 |
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quantiles = quantiles[:qindex] |
249 |
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break |
250 |
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self.lineInfo = self.__GetColorInfo(prop1.GetLineColor(), |
# lowerBound + 1 is always a valid index |
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prop2.GetLineColor(), |
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num) |
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self.fillInfo = self.__GetColorInfo(prop1.GetFill(), |
# |
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prop2.GetFill(), |
# bump up the current quantile index to be a usable index |
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num) |
# if it currently falls below the lowerBound |
256 |
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# |
257 |
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if quantiles[qindex] <= lowerBound: |
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quantiles[qindex] = lowerBound + 1 |
259 |
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self.lineWidth = prop1.GetLineWidth() |
listIndex = quantiles[qindex] |
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self.lineWidthStep = (prop2.GetLineWidth() - self.lineWidth) / num |
value = _list[listIndex] |
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return True |
# |
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# look for similar values around the quantile index |
265 |
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# |
266 |
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lindex = listIndex - 1 |
267 |
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while lindex > lowerBound and value == _list[lindex]: |
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lindex -= 1 |
269 |
|
lcount = (listIndex - 1) - lindex |
270 |
|
|
271 |
|
rindex = listIndex + 1 |
272 |
|
while rindex < maxIndex + 1 and value == _list[rindex]: |
273 |
|
rindex += 1 |
274 |
|
rcount = (listIndex + 1) - rindex |
275 |
|
|
276 |
def next(self): |
# |
277 |
if self.count == 0: |
# adjust the current quantile index based on how many |
278 |
raise StopIteration |
# numbers in the _list are the same as the current value |
279 |
|
# |
280 |
|
newIndex = listIndex |
281 |
|
if lcount == rcount: |
282 |
|
if lcount != 0: |
283 |
|
# |
284 |
|
# there are an equal number of numbers to the left |
285 |
|
# and right, try going to the left first unless |
286 |
|
# doing so creates an empty quantile. |
287 |
|
# |
288 |
|
if lindex != lowerBound: |
289 |
|
newIndex = lindex |
290 |
|
else: |
291 |
|
newIndex = rindex - 1 |
292 |
|
|
293 |
prop = ClassGroupProperties() |
elif lcount < rcount: |
294 |
|
# there are fewer items to the left, so |
295 |
|
# try going to the left first unless |
296 |
|
# doing so creates an empty quantile. |
297 |
|
if lindex != lowerBound: |
298 |
|
newIndex = lindex |
299 |
|
else: |
300 |
|
newIndex = rindex - 1 |
301 |
|
|
302 |
|
elif rcount < lcount: |
303 |
|
# there are fewer items to the right, so go to the right |
304 |
|
newIndex = rindex - 1 |
305 |
|
|
306 |
|
adjusted = adjusted or newIndex != listIndex |
307 |
|
|
308 |
|
quantiles[qindex] = newIndex |
309 |
|
lowerBound = quantiles[qindex] |
310 |
|
|
311 |
|
if len(quantiles) == 0: |
312 |
|
return None |
313 |
|
else: |
314 |
|
return (adjusted, minIndex, maxIndex, |
315 |
|
[(q, (q - minIndex+1) / float(numValues)) \ |
316 |
|
for q in quantiles]) |
317 |
|
|
318 |
if self.lineInfo is None: |
class CustomRamp: |
|
prop.SetLineColor(Color.Transparent) |
|
|
else: |
|
|
prop.SetLineColor(Color(self.lineInfo[CLR][0] / 255, |
|
|
self.lineInfo[CLR][1] / 255, |
|
|
self.lineInfo[CLR][2] / 255)) |
|
|
|
|
|
self.lineInfo[CLR][0] += self.lineInfo[STEP][0] |
|
|
self.lineInfo[CLR][1] += self.lineInfo[STEP][1] |
|
|
self.lineInfo[CLR][2] += self.lineInfo[STEP][2] |
|
319 |
|
|
320 |
if self.fillInfo is None: |
def __init__(self, prop1, prop2): |
321 |
prop.SetFill(Color.Transparent) |
"""Create a ramp between prop1 and prop2.""" |
322 |
else: |
self.prop1 = prop1 |
323 |
prop.SetFill(Color(self.fillInfo[CLR][0] / 255, |
self.prop2 = prop2 |
|
self.fillInfo[CLR][1] / 255, |
|
|
self.fillInfo[CLR][2] / 255)) |
|
324 |
|
|
325 |
self.fillInfo[CLR][0] += self.fillInfo[STEP][0] |
def GetRamp(self): |
326 |
self.fillInfo[CLR][1] += self.fillInfo[STEP][1] |
"""Return this ramp.""" |
327 |
self.fillInfo[CLR][2] += self.fillInfo[STEP][2] |
return self |
328 |
|
|
329 |
|
def GetProperties(self, index): |
330 |
|
"""Return a ClassGroupProperties object whose properties |
331 |
|
represent a point at 'index' between prop1 and prop2 in |
332 |
|
the constructor. |
333 |
|
|
334 |
prop.SetLineWidth(int(self.lineWidth)) |
index -- a value such that 0 <= index <= 1 |
335 |
self.lineWidth += self.lineWidthStep |
""" |
336 |
|
|
337 |
self.count -= 1 |
if not (0 <= index <= 1): |
338 |
|
raise ValueError(_("invalid index")) |
339 |
|
|
340 |
return prop |
newProps = ClassGroupProperties() |
341 |
|
|
342 |
def __GetColorInfo(self, color1, color2, numGroups): |
self.__SetProperty(self.prop1.GetLineColor(), |
343 |
|
self.prop2.GetLineColor(), |
344 |
|
index, newProps.SetLineColor) |
345 |
|
self.__SetProperty(self.prop1.GetFill(), self.prop2.GetFill(), |
346 |
|
index, newProps.SetFill) |
347 |
|
|
348 |
|
w = (self.prop2.GetLineWidth() - self.prop1.GetLineWidth()) \ |
349 |
|
* index \ |
350 |
|
+ self.prop1.GetLineWidth() |
351 |
|
newProps.SetLineWidth(int(round(w))) |
352 |
|
|
353 |
|
s = (self.prop2.GetSize() - self.prop1.GetSize()) \ |
354 |
|
* index \ |
355 |
|
+ self.prop1.GetSize() |
356 |
|
newProps.SetSize(int(round(s))) |
357 |
|
|
358 |
|
return newProps |
359 |
|
|
360 |
|
def __SetProperty(self, color1, color2, index, setf): |
361 |
|
"""Use setf to set the appropriate property for the point |
362 |
|
index percent between color1 and color2. setf is a function |
363 |
|
to call that accepts a Color object or Transparent. |
364 |
|
""" |
365 |
|
|
366 |
if color1 is Color.Transparent and color2 is Color.Transparent: |
if color1 is Transparent and color2 is Transparent: |
367 |
# |
setf(Transparent) |
368 |
# returning early |
elif color1 is Transparent: |
369 |
# |
setf(Color( |
370 |
return None |
color2.red * index, |
371 |
elif color1 is not Color.Transparent and color2 is Color.Transparent: |
color2.green * index, |
372 |
color = [color1.red * 255, |
color2.blue * index)) |
373 |
color1.green * 255, |
elif color2 is Transparent: |
374 |
color1.blue * 255] |
setf(Color( |
375 |
step = (0, 0, 0) |
color1.red * index, |
376 |
elif color1 is Color.Transparent and color2 is not Color.Transparent: |
color1.green * index, |
377 |
color = [color2.red * 255, |
color1.blue * index)) |
|
color2.green * 255, |
|
|
color2.blue * 255] |
|
|
step = (0, 0, 0) |
|
378 |
else: |
else: |
379 |
color = [color1.red * 255, |
setf(Color( |
380 |
color1.green * 255, |
(color2.red - color1.red) * index + color1.red, |
381 |
color1.blue * 255] |
(color2.green - color1.green) * index + color1.green, |
382 |
step = ((color2.red * 255 - color1.red * 255) / numGroups, |
(color2.blue - color1.blue) * index + color1.blue)) |
|
(color2.green * 255 - color1.green * 255) / numGroups, |
|
|
(color2.blue * 255 - color1.blue * 255) / numGroups) |
|
|
|
|
|
|
|
|
return (color, step) |
|
383 |
|
|
384 |
class MonochromaticRamp(CustomRamp): |
class MonochromaticRamp(CustomRamp): |
385 |
|
"""Helper class to make ramps between two colors.""" |
386 |
|
|
387 |
def __init__(self, start, end): |
def __init__(self, start, end): |
388 |
|
"""Create a Monochromatic Ramp. |
389 |
|
|
390 |
|
start -- starting Color |
391 |
|
|
392 |
|
end -- ending Color |
393 |
|
""" |
394 |
sp = ClassGroupProperties() |
sp = ClassGroupProperties() |
395 |
sp.SetLineColor(start) |
sp.SetLineColor(start) |
396 |
sp.SetFill(start) |
sp.SetFill(start) |
401 |
|
|
402 |
CustomRamp.__init__(self, sp, ep) |
CustomRamp.__init__(self, sp, ep) |
403 |
|
|
404 |
class GreyRamp(MonochromaticRamp): |
grey_ramp = MonochromaticRamp(Color(1, 1, 1), Color(0, 0, 0)) |
405 |
def __init__(self): |
red_ramp = MonochromaticRamp(Color(1, 1, 1), Color(.8, 0, 0)) |
406 |
MonochromaticRamp.__init__(self, Color(1, 1, 1), Color(0, 0, 0)) |
green_ramp = MonochromaticRamp(Color(1, 1, 1), Color(0, .8, 0)) |
407 |
|
blue_ramp = MonochromaticRamp(Color(1, 1, 1), Color(0, 0, .8)) |
408 |
class RedRamp(MonochromaticRamp): |
green_to_red_ramp = MonochromaticRamp(Color(0, .8, 0), Color(1, 0, 0)) |
|
def __init__(self): |
|
|
MonochromaticRamp.__init__(self, Color(1, 1, 1), Color(.8, 0, 0)) |
|
|
|
|
|
class GreenRamp(MonochromaticRamp): |
|
|
def __init__(self): |
|
|
MonochromaticRamp.__init__(self, Color(1, 1, 1), Color(0, .8, 0)) |
|
|
|
|
|
class BlueRamp(MonochromaticRamp): |
|
|
def __init__(self): |
|
|
MonochromaticRamp.__init__(self, Color(1, 1, 1), Color(0, 0, .8)) |
|
|
|
|
|
class GreenToRedRamp(MonochromaticRamp): |
|
|
def __init__(self): |
|
|
MonochromaticRamp.__init__(self, Color(0, .8, 0), Color(1, 0, 0)) |
|
409 |
|
|
410 |
class HotToColdRamp: |
class HotToColdRamp: |
411 |
|
"""A ramp that generates properties with colors ranging from |
412 |
|
'hot' colors (e.g. red, orange) to 'cold' colors (e.g. green, blue) |
413 |
|
""" |
414 |
|
|
|
def __iter__(self): |
|
|
return self |
|
|
|
|
415 |
def GetRamp(self): |
def GetRamp(self): |
416 |
|
"""Return this ramp.""" |
417 |
return self |
return self |
418 |
|
|
419 |
def SetNumGroups(self, num): |
def GetProperties(self, index): |
420 |
if num < 0: |
"""Return a ClassGroupProperties object whose properties |
421 |
return False |
represent a point at 'index' between "hot" and "cold". |
422 |
|
|
423 |
self.num = float(num) |
index -- a value such that 0 <= index <= 1 |
424 |
self.index = 0 |
""" |
|
|
|
|
return True |
|
|
|
|
|
def next(self): |
|
|
if self.index == self.num: |
|
|
raise StopIteration |
|
425 |
|
|
426 |
clr = [1.0, 1.0, 1.0] |
clr = [1.0, 1.0, 1.0] |
427 |
|
|
428 |
if self.index < (.25 * self.num): |
if index < .25: |
429 |
clr[0] = 0 |
clr[0] = 0 |
430 |
clr[1] = 4 * self.index / self.num |
clr[1] = 4 * index |
431 |
elif self.index < (.5 * self.num): |
elif index < .5: |
432 |
clr[0] = 0 |
clr[0] = 0 |
433 |
clr[2] = 1 + 4 * (.25 * self.num - self.index) / self.num |
clr[2] = 1 + 4 * (.25 - index) |
434 |
elif self.index < (.75 * self.num): |
elif index < .75: |
435 |
clr[0] = 4 * (self.index - .5 * self.num) / self.num |
clr[0] = 4 * (index - .5) |
436 |
clr[2] = 0 |
clr[2] = 0 |
437 |
else: |
else: |
438 |
clr[1] = 1 + 4 * (.75 * self.num - self.index) / self.num |
clr[1] = 1 + 4 * (.75 - index) |
439 |
clr[2] = 0 |
clr[2] = 0 |
440 |
|
|
|
self.index += 1 |
|
|
|
|
441 |
prop = ClassGroupProperties() |
prop = ClassGroupProperties() |
442 |
prop.SetLineColor(Color(clr[0], clr[1], clr[2])) |
prop.SetLineColor(Color(clr[0], clr[1], clr[2])) |
443 |
prop.SetFill(Color(clr[0], clr[1], clr[2])) |
prop.SetFill(Color(clr[0], clr[1], clr[2])) |
444 |
|
|
445 |
return prop |
return prop |
446 |
|
|
447 |
#class Colors16Ramp: |
class FixedRamp: |
448 |
# |
"""FixedRamp allows particular properties of a ramp to be |
449 |
#def __iter__(self): |
held constant over the ramp. |
450 |
#return self |
""" |
451 |
# |
|
452 |
#def GetRamp(self): |
def __init__(self, ramp, fixes): |
453 |
#return self |
""" |
454 |
# |
ramp -- a source ramp to get the default properties |
455 |
#def SetNumGroups(self, num): |
|
456 |
#if num < 0: |
fixes -- a tuple (lineColor, lineWidth, fillColor) such that |
457 |
#return False |
if any item is not None, the appropriate property will |
458 |
# |
be fixed to that item value. |
459 |
#self.index = 0 |
""" |
460 |
# |
|
461 |
#return True |
self.fixes = fixes |
462 |
|
self.ramp = ramp |
463 |
|
|
464 |
|
def GetRamp(self): |
465 |
|
"""Return this ramp.""" |
466 |
|
return self |
467 |
|
|
468 |
|
def GetProperties(self, index): |
469 |
|
"""Return a ClassGroupProperties object whose properties |
470 |
|
represent a point at 'index' between the properties in |
471 |
|
the ramp that initialized this FixedRamp. |
472 |
|
|
473 |
|
index -- a value such that 0 <= index <= 1 |
474 |
|
""" |
475 |
|
|
476 |
|
props = self.ramp.GetProperties(index) |
477 |
|
if self.fixes[0] is not None: props.SetLineColor(self.fixes[0]) |
478 |
|
if self.fixes[1] is not None: props.SetLineWidth(self.fixes[1]) |
479 |
|
if self.fixes[2] is not None: props.SetFill(self.fixes[2]) |
480 |
|
|
481 |
|
return props |