/usr/lib/python3/dist-packages/pygal/view.py is in python3-pygal 2.4.0-1.
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# This file is part of pygal
#
# A python svg graph plotting library
# Copyright © 2012-2016 Kozea
#
# This library is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This library is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with pygal. If not, see <http://www.gnu.org/licenses/>.
"""Projection and bounding helpers"""
from __future__ import division
from math import cos, log10, pi, sin
class Margin(object):
"""Class reprensenting a margin (top, right, left, bottom)"""
def __init__(self, top, right, bottom, left):
"""Create the margin object from the top, right, left, bottom margin"""
self.top = top
self.right = right
self.bottom = bottom
self.left = left
@property
def x(self):
"""Helper for total x margin"""
return self.left + self.right
@property
def y(self):
"""Helper for total y margin"""
return self.top + self.bottom
class Box(object):
"""Chart boundings"""
margin = .02
def __init__(self, xmin=0, ymin=0, xmax=1, ymax=1):
"""
Create the chart bounds with min max horizontal
and vertical values
"""
self._xmin = xmin
self._ymin = ymin
self._xmax = xmax
self._ymax = ymax
def set_polar_box(self, rmin=0, rmax=1, tmin=0, tmax=2 * pi):
"""Helper for polar charts"""
self._rmin = rmin
self._rmax = rmax
self._tmin = tmin
self._tmax = tmax
self.xmin = self.ymin = rmin - rmax
self.xmax = self.ymax = rmax - rmin
@property
def xmin(self):
"""X minimum getter"""
return self._xmin
@xmin.setter
def xmin(self, value):
"""X minimum setter"""
if value is not None:
self._xmin = value
@property
def ymin(self):
"""Y minimum getter"""
return self._ymin
@ymin.setter
def ymin(self, value):
"""Y minimum setter"""
if value is not None:
self._ymin = value
@property
def xmax(self):
"""X maximum getter"""
return self._xmax
@xmax.setter
def xmax(self, value):
"""X maximum setter"""
if value is not None:
self._xmax = value
@property
def ymax(self):
"""Y maximum getter"""
return self._ymax
@ymax.setter
def ymax(self, value):
"""Y maximum setter"""
if value or self.ymin:
self._ymax = value
@property
def width(self):
"""Helper for box width"""
return self.xmax - self.xmin
@property
def height(self):
"""Helper for box height"""
return self.ymax - self.ymin
def swap(self):
"""Return the box (for horizontal graphs)"""
self.xmin, self.ymin = self.ymin, self.xmin
self.xmax, self.ymax = self.ymax, self.xmax
def fix(self, with_margin=True):
"""Correct box when no values and take margin in account"""
if not self.width:
self.xmax = self.xmin + 1
if not self.height:
self.ymin /= 2
self.ymax += self.ymin
xmargin = self.margin * self.width
self.xmin -= xmargin
self.xmax += xmargin
if with_margin:
ymargin = self.margin * self.height
self.ymin -= ymargin
self.ymax += ymargin
class View(object):
"""Projection base class"""
def __init__(self, width, height, box):
"""Create the view with a width an height and a box bounds"""
self.width = width
self.height = height
self.box = box
self.box.fix()
def x(self, x):
"""Project x"""
if x is None:
return None
return self.width * (x - self.box.xmin) / self.box.width
def y(self, y):
"""Project y"""
if y is None:
return None
return (self.height - self.height *
(y - self.box.ymin) / self.box.height)
def __call__(self, xy):
"""Project x and y"""
x, y = xy
return (self.x(x), self.y(y))
class ReverseView(View):
"""Same as view but reversed vertically"""
def y(self, y):
"""Project reversed y"""
if y is None:
return None
return (self.height * (y - self.box.ymin) / self.box.height)
class HorizontalView(View):
"""Same as view but transposed"""
def __init__(self, width, height, box):
"""Create the view with a width an height and a box bounds"""
self._force_vertical = None
self.width = width
self.height = height
self.box = box
self.box.fix()
self.box.swap()
def x(self, x):
"""Project x as y"""
if x is None:
return None
if self._force_vertical:
return super(HorizontalView, self).x(x)
return super(HorizontalView, self).y(x)
def y(self, y):
"""Project y as x"""
if y is None:
return None
if self._force_vertical:
return super(HorizontalView, self).y(y)
return super(HorizontalView, self).x(y)
class PolarView(View):
"""Polar projection for pie like graphs"""
def __call__(self, rhotheta):
"""Project rho and theta"""
if None in rhotheta:
return None, None
rho, theta = rhotheta
return super(PolarView, self).__call__(
(rho * cos(theta), rho * sin(theta)))
class PolarLogView(View):
"""Logarithmic polar projection"""
def __init__(self, width, height, box):
"""Create the view with a width an height and a box bounds"""
super(PolarLogView, self).__init__(width, height, box)
if not hasattr(box, '_rmin') or not hasattr(box, '_rmax'):
raise Exception(
'Box must be set with set_polar_box for polar charts')
self.log10_rmax = log10(self.box._rmax)
self.log10_rmin = log10(self.box._rmin)
if self.log10_rmin == self.log10_rmax:
self.log10_rmax = self.log10_rmin + 1
def __call__(self, rhotheta):
"""Project rho and theta"""
if None in rhotheta:
return None, None
rho, theta = rhotheta
# Center case
if rho == 0:
return super(PolarLogView, self).__call__((0, 0))
rho = (self.box._rmax - self.box._rmin) * (
log10(rho) - self.log10_rmin) / (
self.log10_rmax - self.log10_rmin)
return super(PolarLogView, self).__call__(
(rho * cos(theta), rho * sin(theta)))
class PolarThetaView(View):
"""Logarithmic polar projection"""
def __init__(self, width, height, box, aperture=pi / 3):
"""Create the view with a width an height and a box bounds"""
super(PolarThetaView, self).__init__(width, height, box)
self.aperture = aperture
if not hasattr(box, '_tmin') or not hasattr(box, '_tmax'):
raise Exception(
'Box must be set with set_polar_box for polar charts')
def __call__(self, rhotheta):
"""Project rho and theta"""
if None in rhotheta:
return None, None
rho, theta = rhotheta
start = 3 * pi / 2 + self.aperture / 2
theta = start + (2 * pi - self.aperture) * (
theta - self.box._tmin) / (
self.box._tmax - self.box._tmin)
return super(PolarThetaView, self).__call__(
(rho * cos(theta), rho * sin(theta)))
class PolarThetaLogView(View):
"""Logarithmic polar projection"""
def __init__(self, width, height, box, aperture=pi / 3):
"""Create the view with a width an height and a box bounds"""
super(PolarThetaLogView, self).__init__(width, height, box)
self.aperture = aperture
if not hasattr(box, '_tmin') or not hasattr(box, '_tmax'):
raise Exception(
'Box must be set with set_polar_box for polar charts')
self.log10_tmax = log10(self.box._tmax) if self.box._tmax > 0 else 0
self.log10_tmin = log10(self.box._tmin) if self.box._tmin > 0 else 0
if self.log10_tmin == self.log10_tmax:
self.log10_tmax = self.log10_tmin + 1
def __call__(self, rhotheta):
"""Project rho and theta"""
if None in rhotheta:
return None, None
rho, theta = rhotheta
# Center case
if theta == 0:
return super(PolarThetaLogView, self).__call__((0, 0))
theta = self.box._tmin + (self.box._tmax - self.box._tmin) * (
log10(theta) - self.log10_tmin) / (
self.log10_tmax - self.log10_tmin)
start = 3 * pi / 2 + self.aperture / 2
theta = start + (2 * pi - self.aperture) * (
theta - self.box._tmin) / (
self.box._tmax - self.box._tmin)
return super(PolarThetaLogView, self).__call__(
(rho * cos(theta), rho * sin(theta)))
class LogView(View):
"""Y Logarithmic projection"""
# Do not want to call the parent here
def __init__(self, width, height, box):
"""Create the view with a width an height and a box bounds"""
self.width = width
self.height = height
self.box = box
self.log10_ymax = log10(self.box.ymax) if self.box.ymax > 0 else 0
self.log10_ymin = log10(self.box.ymin) if self.box.ymin > 0 else 0
if self.log10_ymin == self.log10_ymax:
self.log10_ymax = self.log10_ymin + 1
self.box.fix(False)
def y(self, y):
"""Project y"""
if y is None or y <= 0 or self.log10_ymax - self.log10_ymin == 0:
return 0
return (self.height - self.height *
(log10(y) - self.log10_ymin) / (
self.log10_ymax - self.log10_ymin))
class XLogView(View):
"""X logarithmic projection"""
# Do not want to call the parent here
def __init__(self, width, height, box):
"""Create the view with a width an height and a box bounds"""
self.width = width
self.height = height
self.box = box
self.log10_xmax = log10(self.box.xmax) if self.box.xmax > 0 else 0
self.log10_xmin = log10(self.box.xmin) if self.box.xmin > 0 else 0
self.box.fix(False)
def x(self, x):
"""Project x"""
if x is None or x <= 0 or self.log10_xmax - self.log10_xmin == 0:
return None
return (self.width *
(log10(x) - self.log10_xmin) /
(self.log10_xmax - self.log10_xmin))
class XYLogView(XLogView, LogView):
"""X and Y logarithmic projection"""
def __init__(self, width, height, box):
"""Create the view with a width an height and a box bounds"""
self.width = width
self.height = height
self.box = box
self.log10_ymax = log10(self.box.ymax) if self.box.ymax > 0 else 0
self.log10_ymin = log10(self.box.ymin) if self.box.ymin > 0 else 0
self.log10_xmax = log10(self.box.xmax) if self.box.xmax > 0 else 0
self.log10_xmin = log10(self.box.xmin) if self.box.xmin > 0 else 0
self.box.fix(False)
class HorizontalLogView(XLogView):
"""Transposed Logarithmic projection"""
# Do not want to call the parent here
def __init__(self, width, height, box):
"""Create the view with a width an height and a box bounds"""
self._force_vertical = None
self.width = width
self.height = height
self.box = box
self.log10_xmax = log10(self.box.ymax) if self.box.ymax > 0 else 0
self.log10_xmin = log10(self.box.ymin) if self.box.ymin > 0 else 0
if self.log10_xmin == self.log10_xmax:
self.log10_xmax = self.log10_xmin + 1
self.box.fix(False)
self.box.swap()
def x(self, x):
"""Project x as y"""
if x is None:
return None
if self._force_vertical:
return super(HorizontalLogView, self).x(x)
return super(XLogView, self).y(x)
def y(self, y):
"""Project y as x"""
if y is None:
return None
if self._force_vertical:
return super(XLogView, self).y(y)
return super(HorizontalLogView, self).x(y)
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