/usr/lib/python2.7/dist-packages/wcsaxes/ticklabels.py is in python-wcsaxes 0.6-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import numpy as np
from matplotlib.text import Text
from .frame import RectangularFrame
def sort_using(X, Y):
return [x for (y, x) in sorted(zip(Y, X))]
class TickLabels(Text):
def __init__(self, frame, *args, **kwargs):
self.clear()
self._frame = frame
super(TickLabels, self).__init__(*args, **kwargs)
self.set_clip_on(True)
self.set_visible_axes('all')
self.pad = 0.3
self._exclude_overlapping = False
def clear(self):
self.world = {}
self.pixel = {}
self.angle = {}
self.text = {}
self.disp = {}
def add(self, axis, world, pixel, angle, text, axis_displacement):
if axis not in self.world:
self.world[axis] = [world]
self.pixel[axis] = [pixel]
self.angle[axis] = [angle]
self.text[axis] = [text]
self.disp[axis] = [axis_displacement]
else:
self.world[axis].append(world)
self.pixel[axis].append(pixel)
self.angle[axis].append(angle)
self.text[axis].append(text)
self.disp[axis].append(axis_displacement)
def sort(self):
"""
Sort by axis displacement, which allows us to figure out which parts
of labels to not repeat.
"""
for axis in self.world:
self.world[axis] = sort_using(self.world[axis], self.disp[axis])
self.pixel[axis] = sort_using(self.pixel[axis], self.disp[axis])
self.angle[axis] = sort_using(self.angle[axis], self.disp[axis])
self.text[axis] = sort_using(self.text[axis], self.disp[axis])
self.disp[axis] = sort_using(self.disp[axis], self.disp[axis])
def simplify_labels(self):
"""
Figure out which parts of labels can be dropped to avoid repetition.
"""
self.sort()
for axis in self.world:
t1 = self.text[axis][0]
for i in range(1, len(self.world[axis])):
t2 = self.text[axis][i]
if len(t1) != len(t2):
t1 = self.text[axis][i]
continue
start = 0
for j in range(len(t1)):
if t1[j] != t2[j]:
break
if t1[j] not in '-0123456789.':
start = j + 1
if start == 0:
t1 = self.text[axis][i]
else:
self.text[axis][i] = self.text[axis][i][start:]
def set_visible_axes(self, visible_axes):
self._visible_axes = visible_axes
def get_visible_axes(self):
if self._visible_axes == 'all':
return self.world.keys()
else:
return [x for x in self._visible_axes if x in self.world]
def set_exclude_overlapping(self, exclude_overlapping):
self._exclude_overlapping = exclude_overlapping
def draw(self, renderer, bboxes, ticklabels_bbox):
if not self.get_visible():
return
self.simplify_labels()
text_size = renderer.points_to_pixels(self.get_size())
for axis in self.get_visible_axes():
for i in range(len(self.world[axis])):
self.set_text(self.text[axis][i])
x, y = self.pixel[axis][i]
if isinstance(self._frame, RectangularFrame):
# This is just to preserve the current results, but can be
# removed next time the reference images are re-generated.
if np.abs(self.angle[axis][i]) < 45.:
ha = 'right'
va = 'bottom'
dx = - text_size * 0.5
dy = - text_size * 0.5
elif np.abs(self.angle[axis][i] - 90.) < 45:
ha = 'center'
va = 'bottom'
dx = 0
dy = - text_size * 1.5
elif np.abs(self.angle[axis][i] - 180.) < 45:
ha = 'left'
va = 'bottom'
dx = text_size * 0.5
dy = - text_size * 0.5
else:
ha = 'center'
va = 'bottom'
dx = 0
dy = text_size * 0.2
self.set_position((x + dx, y + dy))
self.set_ha(ha)
self.set_va(va)
else:
# This is the more general code for arbitrarily oriented
# axes
# Set initial position and find bounding box
self.set_position((x, y))
bb = super(TickLabels, self).get_window_extent(renderer)
# Find width and height, as well as angle at which we
# transition which side of the label we use to anchor the
# label.
width = bb.width
height = bb.height
theta = np.tan(height / width)
# Project axis angle onto bounding box
ax = np.cos(np.radians(self.angle[axis][i]))
ay = np.sin(np.radians(self.angle[axis][i]))
# Set anchor point for label
if np.abs(self.angle[axis][i]) < 45.:
dx = width
dy = ay * height
elif np.abs(self.angle[axis][i] - 90.) < 45:
dx = ax * width
dy = height
elif np.abs(self.angle[axis][i] - 180.) < 45:
dx = -width
dy = ay * height
else:
dx = ax * width
dy = -height
dx *= 0.5
dy *= 0.5
# Find normalized vector along axis normal, so as to be
# able to nudge the label away by a constant padding factor
dist = np.hypot(dx, dy)
ddx = dx / dist
ddy = dy / dist
dx += ddx * text_size * self.pad
dy += ddy * text_size * self.pad
self.set_position((x - dx, y - dy))
self.set_ha('center')
self.set_va('center')
bb = super(TickLabels, self).get_window_extent(renderer)
# TODO: the problem here is that we might get rid of a label
# that has a key starting bit such as -0:30 where the -0
# might be dropped from all other labels.
if not self._exclude_overlapping or bb.count_overlaps(bboxes) == 0:
super(TickLabels, self).draw(renderer)
bboxes.append(bb)
ticklabels_bbox.append(bb)
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