/usr/lib/python3/dist-packages/wcsaxes/frame.py is in python3-wcsaxes 0.9-1.
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import abc
from collections import OrderedDict
import numpy as np
from astropy.extern import six
from matplotlib.lines import Line2D, Path
from matplotlib.patches import PathPatch
__all__ = ['Spine', 'BaseFrame', 'RectangularFrame', 'EllipticalFrame']
class Spine(object):
def __init__(self, parent_axes, transform):
self.parent_axes = parent_axes
self.transform = transform
self.data = None
self.pixel = None
self.world = None
@property
def data(self):
return self._data
@data.setter
def data(self, value):
if value is None:
self._data = None
self._pixel = None
self._world = None
else:
self._data = value
self._pixel = self.parent_axes.transData.transform(self._data)
self._world = self.transform.transform(self._data)
self._update_normal()
@property
def pixel(self):
return self._pixel
@pixel.setter
def pixel(self, value):
if value is None:
self._data = None
self._pixel = None
self._world = None
else:
self._data = self.parent_axes.transData.inverted().transform(self._data)
self._pixel = value
self._world = self.transform.transform(self._data)
self._update_normal()
@property
def world(self):
return self._world
@world.setter
def world(self, value):
if value is None:
self._data = None
self._pixel = None
self._world = None
else:
self._data = self.transform.transform(value)
self._pixel = self.parent_axes.transData.transform(self._data)
self._world = value
self._update_normal()
def _update_normal(self):
# Find angle normal to border and inwards, in display coordinate
dx = self.pixel[1:, 0] - self.pixel[:-1, 0]
dy = self.pixel[1:, 1] - self.pixel[:-1, 1]
self.normal_angle = np.degrees(np.arctan2(dx, -dy))
@six.add_metaclass(abc.ABCMeta)
class BaseFrame(OrderedDict):
def __init__(self, parent_axes, transform, path=None):
super(BaseFrame, self).__init__()
self.parent_axes = parent_axes
self._transform = transform
self._linewidth = None
self._color = 'black'
self._path = path
for axis in self.spine_names:
self[axis] = Spine(parent_axes, transform)
@property
def origin(self):
ymin, ymax = self.parent_axes.get_ylim()
return 'lower' if ymin < ymax else 'upper'
@property
def transform(self):
return self._transform
@transform.setter
def transform(self, value):
self._transform = value
for axis in self:
self[axis].transform = value
def _update_patch_path(self):
self.update_spines()
x, y = [], []
for axis in self:
x.append(self[axis].data[:, 0])
y.append(self[axis].data[:, 1])
vertices = np.vstack([np.hstack(x), np.hstack(y)]).transpose()
if self._path is None:
self._path = Path(vertices)
else:
self._path.vertices = vertices
@property
def patch(self):
self._update_patch_path()
return PathPatch(self._path, transform=self.parent_axes.transData,
facecolor='white', edgecolor='white')
def draw(self, renderer):
for axis in self:
x, y = self[axis].pixel[:, 0], self[axis].pixel[:, 1]
line = Line2D(x, y, linewidth=self._linewidth, color=self._color, zorder=1000)
line.draw(renderer)
def sample(self, n_samples):
self.update_spines()
spines = OrderedDict()
for axis in self:
data = self[axis].data
p = np.linspace(0., 1., data.shape[0])
p_new = np.linspace(0., 1., n_samples)
spines[axis] = Spine(self.parent_axes, self.transform)
spines[axis].data = np.array([np.interp(p_new, p, data[:, 0]),
np.interp(p_new, p, data[:, 1])]).transpose()
return spines
def set_color(self, color):
"""
Sets the color of the frame.
Parameters
----------
color : string
The color of the frame.
"""
self._color = color
def get_color(self):
return self._color
def set_linewidth(self, linewidth):
"""
Sets the linewidth of the frame.
Parameters
----------
linewidth : float
The linewidth of the frame in points.
"""
self._linewidth = linewidth
def get_linewidth(self):
return self._linewidth
@abc.abstractmethod
def update_spines(self):
raise NotImplementedError("")
class RectangularFrame(BaseFrame):
spine_names = 'brtl'
def update_spines(self):
xmin, xmax = self.parent_axes.get_xlim()
ymin, ymax = self.parent_axes.get_ylim()
self['b'].data = np.array(([xmin, ymin], [xmax, ymin]))
self['r'].data = np.array(([xmax, ymin], [xmax, ymax]))
self['t'].data = np.array(([xmax, ymax], [xmin, ymax]))
self['l'].data = np.array(([xmin, ymax], [xmin, ymin]))
class EllipticalFrame(BaseFrame):
spine_names = 'c'
def update_spines(self):
xmin, xmax = self.parent_axes.get_xlim()
ymin, ymax = self.parent_axes.get_ylim()
xmid = 0.5 * (xmax + xmin)
ymid = 0.5 * (ymax + ymin)
dx = xmid - xmin
dy = ymid - ymin
theta = np.linspace(0., 2 * np.pi, 1000)
self['c'].data = np.array([xmid + dx * np.cos(theta),
ymid + dy * np.sin(theta)]).transpose()
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