# coding: utf-8
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"""This module provides the :class:`Histogram` item of the :class:`Plot`.
"""
__authors__ = ["H. Payno", "T. Vincent"]
__license__ = "MIT"
__date__ = "28/08/2018"
import logging
import numpy
from collections import OrderedDict, namedtuple
try:
from collections import abc
except ImportError: # Python2 support
import collections as abc
from .core import (Item, AlphaMixIn, BaselineMixIn, ColorMixIn, FillMixIn,
LineMixIn, YAxisMixIn, ItemChangedType)
_logger = logging.getLogger(__name__)
def _computeEdges(x, histogramType):
"""Compute the edges from a set of xs and a rule to generate the edges
:param x: the x value of the curve to transform into an histogram
:param histogramType: the type of histogram we wan't to generate.
This define the way to center the histogram values compared to the
curve value. Possible values can be::
- 'left'
- 'right'
- 'center'
:return: the edges for the given x and the histogramType
"""
# for now we consider that the spaces between xs are constant
edges = x.copy()
if histogramType is 'left':
width = 1
if len(x) > 1:
width = x[1] - x[0]
edges = numpy.append(x[0] - width, edges)
if histogramType is 'center':
edges = _computeEdges(edges, 'right')
widths = (edges[1:] - edges[0:-1]) / 2.0
widths = numpy.append(widths, widths[-1])
edges = edges - widths
if histogramType is 'right':
width = 1
if len(x) > 1:
width = x[-1] - x[-2]
edges = numpy.append(edges, x[-1] + width)
return edges
def _getHistogramCurve(histogram, edges):
"""Returns the x and y value of a curve corresponding to the histogram
:param numpy.ndarray histogram: The values of the histogram
:param numpy.ndarray edges: The bin edges of the histogram
:return: a tuple(x, y) which contains the value of the curve to use
to display the histogram
"""
assert len(histogram) + 1 == len(edges)
x = numpy.empty(len(histogram) * 2, dtype=edges.dtype)
y = numpy.empty(len(histogram) * 2, dtype=histogram.dtype)
# Make a curve with stairs
x[:-1:2] = edges[:-1]
x[1::2] = edges[1:]
y[:-1:2] = histogram
y[1::2] = histogram
return x, y
# TODO: Yerror, test log scale
[docs]class Histogram(Item, AlphaMixIn, ColorMixIn, FillMixIn,
LineMixIn, YAxisMixIn, BaselineMixIn):
"""Description of an histogram"""
_DEFAULT_Z_LAYER = 1
"""Default overlay layer for histograms"""
_DEFAULT_SELECTABLE = False
"""Default selectable state for histograms"""
_DEFAULT_LINEWIDTH = 1.
"""Default line width of the histogram"""
_DEFAULT_LINESTYLE = '-'
"""Default line style of the histogram"""
_DEFAULT_BASELINE = None
def __init__(self):
Item.__init__(self)
AlphaMixIn.__init__(self)
BaselineMixIn.__init__(self)
ColorMixIn.__init__(self)
FillMixIn.__init__(self)
LineMixIn.__init__(self)
YAxisMixIn.__init__(self)
self._histogram = ()
self._edges = ()
self._setBaseline(Histogram._DEFAULT_BASELINE)
def _addBackendRenderer(self, backend):
"""Update backend renderer"""
values, edges, baseline = self.getData(copy=False)
if values.size == 0:
return None # No data to display, do not add renderer
if values.size == 0:
return None # No data to display, do not add renderer to backend
x, y = _getHistogramCurve(values, edges)
# Filter-out values <= 0
plot = self.getPlot()
if plot is not None:
xPositive = plot.getXAxis()._isLogarithmic()
yPositive = plot.getYAxis()._isLogarithmic()
else:
xPositive = False
yPositive = False
if xPositive or yPositive:
clipped = numpy.logical_or(
(x <= 0) if xPositive else False,
(y <= 0) if yPositive else False)
# Make a copy and replace negative points by NaN
x = numpy.array(x, dtype=numpy.float)
y = numpy.array(y, dtype=numpy.float)
x[clipped] = numpy.nan
y[clipped] = numpy.nan
return backend.addCurve(x, y,
color=self.getColor(),
symbol='',
linestyle=self.getLineStyle(),
linewidth=self.getLineWidth(),
yaxis=self.getYAxis(),
xerror=None,
yerror=None,
z=self.getZValue(),
fill=self.isFill(),
alpha=self.getAlpha(),
baseline=baseline,
symbolsize=1)
def _getBounds(self):
values, edges, baseline = self.getData(copy=False)
plot = self.getPlot()
if plot is not None:
xPositive = plot.getXAxis()._isLogarithmic()
yPositive = plot.getYAxis()._isLogarithmic()
else:
xPositive = False
yPositive = False
if xPositive or yPositive:
values = numpy.array(values, copy=True, dtype=numpy.float)
if xPositive:
# Replace edges <= 0 by NaN and corresponding values by NaN
clipped_edges = (edges <= 0)
edges = numpy.array(edges, copy=True, dtype=numpy.float)
edges[clipped_edges] = numpy.nan
clipped_values = numpy.logical_or(clipped_edges[:-1],
clipped_edges[1:])
else:
clipped_values = numpy.zeros_like(values, dtype=numpy.bool)
if yPositive:
# Replace values <= 0 by NaN, do not modify edges
clipped_values = numpy.logical_or(clipped_values, values <= 0)
values[clipped_values] = numpy.nan
if yPositive:
return (numpy.nanmin(edges),
numpy.nanmax(edges),
numpy.nanmin(values),
numpy.nanmax(values))
else: # No log scale on y axis, include 0 in bounds
return (numpy.nanmin(edges),
numpy.nanmax(edges),
min(0, numpy.nanmin(values)),
max(0, numpy.nanmax(values)))
def setVisible(self, visible):
"""Set visibility of item.
:param bool visible: True to display it, False otherwise
"""
visible = bool(visible)
# TODO hackish data range implementation
if self.isVisible() != visible:
plot = self.getPlot()
if plot is not None:
plot._invalidateDataRange()
super(Histogram, self).setVisible(visible)
[docs] def getValueData(self, copy=True):
"""The values of the histogram
:param copy: True (Default) to get a copy,
False to use internal representation (do not modify!)
:returns: The bin edges of the histogram
:rtype: numpy.ndarray
"""
return numpy.array(self._histogram, copy=copy)
[docs] def getBinEdgesData(self, copy=True):
"""The bin edges of the histogram (number of histogram values + 1)
:param copy: True (Default) to get a copy,
False to use internal representation (do not modify!)
:returns: The bin edges of the histogram
:rtype: numpy.ndarray
"""
return numpy.array(self._edges, copy=copy)
[docs] def getData(self, copy=True):
"""Return the histogram values, bin edges and baseline
:param copy: True (Default) to get a copy,
False to use internal representation (do not modify!)
:returns: (N histogram value, N+1 bin edges)
:rtype: 2-tuple of numpy.nadarray
"""
return (self.getValueData(copy),
self.getBinEdgesData(copy),
self.getBaseline(copy))
[docs] def setData(self, histogram, edges, align='center', baseline=None,
copy=True):
"""Set the histogram values and bin edges.
:param numpy.ndarray histogram: The values of the histogram.
:param numpy.ndarray edges:
The bin edges of the histogram.
If histogram and edges have the same length, the bin edges
are computed according to the align parameter.
:param str align:
In case histogram values and edges have the same length N,
the N+1 bin edges are computed according to the alignment in:
'center' (default), 'left', 'right'.
:param baseline: histogram baseline
:type baseline: Union[None,float,numpy.ndarray]
:param bool copy: True make a copy of the data (default),
False to use provided arrays.
"""
histogram = numpy.array(histogram, copy=copy)
edges = numpy.array(edges, copy=copy)
assert histogram.ndim == 1
assert edges.ndim == 1
assert edges.size in (histogram.size, histogram.size + 1)
assert align in ('center', 'left', 'right')
if histogram.size == 0: # No data
self._histogram = ()
self._edges = ()
else:
if edges.size == histogram.size: # Compute true bin edges
edges = _computeEdges(edges, align)
# Check that bin edges are monotonic
edgesDiff = numpy.diff(edges)
assert numpy.all(edgesDiff >= 0) or numpy.all(edgesDiff <= 0)
# manage baseline
if (isinstance(baseline, abc.Iterable)):
baseline = numpy.array(baseline)
if baseline.size == histogram.size:
new_baseline = numpy.empty(baseline.shape[0] * 2)
for i_value, value in enumerate(baseline):
new_baseline[i_value*2:i_value*2+2] = value
baseline = new_baseline
self._histogram = histogram
self._edges = edges
self._alignement = align
self._setBaseline(baseline)
if self.isVisible():
plot = self.getPlot()
if plot is not None:
plot._invalidateDataRange()
self._updated(ItemChangedType.DATA)
def getAlignment(self):
"""
:return: histogram alignement. Value in ('center', 'left', 'right').
"""
return self._alignement
def _revertComputeEdges(self, x, histogramType):
"""Compute the edges from a set of xs and a rule to generate the edges
:param x: the x value of the curve to transform into an histogram
:param histogramType: the type of histogram we wan't to generate.
This define the way to center the histogram values compared to the
curve value. Possible values can be::
- 'left'
- 'right'
- 'center'
:return: the edges for the given x and the histogramType
"""
# for now we consider that the spaces between xs are constant
edges = x.copy()
if histogramType is 'left':
return edges[1:]
if histogramType is 'center':
edges = (edges[1:] + edges[:-1]) / 2.0
if histogramType is 'right':
width = 1
if len(x) > 1:
width = x[-1] + x[-2]
edges = edges[:-1]
return edges
