/usr/lib/python3/dist-packages/wcsaxes/ticks.py is in python3-wcsaxes 0.9-1.
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import numpy as np
from matplotlib.lines import Path, Line2D
from matplotlib.transforms import Affine2D
from matplotlib import rcParams
class Ticks(Line2D):
"""
Ticks are derived from Line2D, and note that ticks themselves
are markers. Thus, you should use set_mec, set_mew, etc.
To change the tick size (length), you need to use
set_ticksize. To change the direction of the ticks (ticks are
in opposite direction of ticklabels by default), use
set_tick_out(False).
Note that Matplotlib's defaults dictionary :data:`~matplotlib.rcParams`
contains default settings (color, size, width) of the form `xtick.*` and
`ytick.*`. In a WCS projection, there may not be a clear relationship
between axes of the projection and 'x' or 'y' axes. For this reason,
we read defaults from `xtick.*`. The following settings affect the
default appearance of ticks:
* `xtick.major.size`
* `xtick.major.width`
* `xtick.color`
"""
def __init__(self, ticksize=None, tick_out=False, **kwargs):
if ticksize is None:
ticksize = rcParams['xtick.major.size']
self.set_ticksize(ticksize)
self.set_tick_out(tick_out)
# FIXME: tick_out is incompatible with Matplotlib tickdir option
self.clear()
line2d_kwargs = {
'color': rcParams['xtick.color'],
# For the linewidth we need to set a default since old versions of
# matplotlib don't have this.
'linewidth': rcParams.get('xtick.major.width', 1)
}
line2d_kwargs.update(kwargs)
Line2D.__init__(self, [0.], [0.], **line2d_kwargs)
self.set_visible_axes('all')
self._display_minor_ticks = False
def display_minor_ticks(self, display_minor_ticks):
self._display_minor_ticks = display_minor_ticks
def get_display_minor_ticks(self):
return self._display_minor_ticks
def set_tick_out(self, tick_out):
"""
set True if tick need to be rotated by 180 degree.
"""
self._tick_out = tick_out
def get_tick_out(self):
"""
Return True if the tick will be rotated by 180 degree.
"""
return self._tick_out
def set_ticksize(self, ticksize):
"""
set length of the ticks in points.
"""
self._ticksize = ticksize
def get_ticksize(self):
"""
Return length of the ticks in points.
"""
return self._ticksize
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 clear(self):
self.world = {}
self.pixel = {}
self.angle = {}
self.disp = {}
self.minor_world = {}
self.minor_pixel = {}
self.minor_angle = {}
self.minor_disp = {}
def add(self, axis, world, pixel, angle, axis_displacement):
if axis not in self.world:
self.world[axis] = [world]
self.pixel[axis] = [pixel]
self.angle[axis] = [angle]
self.disp[axis] = [axis_displacement]
else:
self.world[axis].append(world)
self.pixel[axis].append(pixel)
self.angle[axis].append(angle)
self.disp[axis].append(axis_displacement)
def get_minor_world(self):
return self.minor_world
def add_minor(self, minor_axis, minor_world, minor_pixel, minor_angle,
minor_axis_displacement):
if minor_axis not in self.minor_world:
self.minor_world[minor_axis] = [minor_world]
self.minor_pixel[minor_axis] = [minor_pixel]
self.minor_angle[minor_axis] = [minor_angle]
self.minor_disp[minor_axis] = [minor_axis_displacement]
else:
self.minor_world[minor_axis].append(minor_world)
self.minor_pixel[minor_axis].append(minor_pixel)
self.minor_angle[minor_axis].append(minor_angle)
self.minor_disp[minor_axis].append(minor_axis_displacement)
def __len__(self):
return len(self.world)
_tickvert_path = Path([[0., 0.], [1., 0.]])
def draw(self, renderer):
"""
Draw the ticks.
"""
if not self.get_visible():
return
offset = renderer.points_to_pixels(self.get_ticksize())
self._draw_ticks(renderer, self.pixel, self.angle, offset)
if self._display_minor_ticks:
offset = offset * 0.5 # for minor ticksize
self._draw_ticks(renderer, self.minor_pixel, self.minor_angle, offset)
def _draw_ticks(self, renderer, pixel_array, angle_array, offset):
"""
Draw the minor ticks.
"""
path_trans = self.get_transform()
gc = renderer.new_gc()
gc.set_foreground(self.get_color())
gc.set_alpha(self.get_alpha())
gc.set_linewidth(self.get_linewidth())
marker_scale = Affine2D().scale(offset, offset)
marker_rotation = Affine2D()
marker_transform = marker_scale + marker_rotation
initial_angle = 180. if self.get_tick_out() else 0.
for axis in self.get_visible_axes():
if not axis in pixel_array:
continue
for loc, angle in zip(pixel_array[axis], angle_array[axis]):
# Set the rotation for this tick
marker_rotation.rotate_deg(initial_angle + angle)
# Draw the markers
locs = path_trans.transform_non_affine(np.array([loc, loc]))
renderer.draw_markers(gc, self._tickvert_path, marker_transform,
Path(locs), path_trans.get_affine())
# Reset the tick rotation before moving to the next tick
marker_rotation.clear()
gc.restore()
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