matplotlib/lib/matplotlib/hatch.py at master · feisuo/matplotlib · GitHub

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"""

Contains a classes for generating hatch patterns.

"""

from __future__ import (absolute_import, division, print_function,

unicode_literals)

import six

from six.moves import xrange

import numpy as np

from matplotlib.path import Path

class HatchPatternBase(object):

"""

The base class for a hatch pattern.

"""

pass

class HorizontalHatch(HatchPatternBase):

def __init__(self, hatch, density):

self.num_lines = int((hatch.count('-') + hatch.count('+')) * density)

self.num_vertices = self.num_lines * 2

def set_vertices_and_codes(self, vertices, codes):

steps, stepsize = np.linspace(0.0, 1.0, self.num_lines, False,

retstep=True)

steps += stepsize / 2.

vertices[0::2, 0] = 0.0

vertices[0::2, 1] = steps

vertices[1::2, 0] = 1.0

vertices[1::2, 1] = steps

codes[0::2] = Path.MOVETO

codes[1::2] = Path.LINETO

class VerticalHatch(HatchPatternBase):

def __init__(self, hatch, density):

self.num_lines = int((hatch.count('|') + hatch.count('+')) * density)

self.num_vertices = self.num_lines * 2

def set_vertices_and_codes(self, vertices, codes):

steps, stepsize = np.linspace(0.0, 1.0, self.num_lines, False,

retstep=True)

steps += stepsize / 2.

vertices[0::2, 0] = steps

vertices[0::2, 1] = 0.0

vertices[1::2, 0] = steps

vertices[1::2, 1] = 1.0

codes[0::2] = Path.MOVETO

codes[1::2] = Path.LINETO

class NorthEastHatch(HatchPatternBase):

def __init__(self, hatch, density):

self.num_lines = int((hatch.count('/') + hatch.count('x') +

hatch.count('X')) * density)

if self.num_lines:

self.num_vertices = (self.num_lines + 1) * 2

else:

self.num_vertices = 0

def set_vertices_and_codes(self, vertices, codes):

steps = np.linspace(-0.5, 0.5, self.num_lines + 1, True)

vertices[0::2, 0] = 0.0 + steps

vertices[0::2, 1] = 0.0 - steps

vertices[1::2, 0] = 1.0 + steps

vertices[1::2, 1] = 1.0 - steps

codes[0::2] = Path.MOVETO

codes[1::2] = Path.LINETO

class SouthEastHatch(HatchPatternBase):

def __init__(self, hatch, density):

self.num_lines = int((hatch.count('\\') + hatch.count('x') +

hatch.count('X')) * density)

self.num_vertices = (self.num_lines + 1) * 2

if self.num_lines:

self.num_vertices = (self.num_lines + 1) * 2

else:

self.num_vertices = 0

def set_vertices_and_codes(self, vertices, codes):

steps = np.linspace(-0.5, 0.5, self.num_lines + 1, True)

vertices[0::2, 0] = 0.0 + steps

vertices[0::2, 1] = 1.0 + steps

vertices[1::2, 0] = 1.0 + steps

vertices[1::2, 1] = 0.0 + steps

codes[0::2] = Path.MOVETO

codes[1::2] = Path.LINETO

class Shapes(HatchPatternBase):

filled = False

def __init__(self, hatch, density):

if self.num_rows == 0:

self.num_shapes = 0

self.num_vertices = 0

else:

self.num_shapes = ((self.num_rows // 2 + 1) * (self.num_rows + 1) +

(self.num_rows // 2) * (self.num_rows))

self.num_vertices = (self.num_shapes *

len(self.shape_vertices) *

(self.filled and 1 or 2))

def set_vertices_and_codes(self, vertices, codes):

offset = 1.0 / self.num_rows

shape_vertices = self.shape_vertices * offset * self.size

if not self.filled:

inner_vertices = shape_vertices[::-1] * 0.9

shape_codes = self.shape_codes

shape_size = len(shape_vertices)

cursor = 0

for row in xrange(self.num_rows + 1):

if row % 2 == 0:

cols = np.linspace(0.0, 1.0, self.num_rows + 1, True)

else:

cols = np.linspace(offset / 2.0, 1.0 - offset / 2.0,

self.num_rows, True)

row_pos = row * offset

for col_pos in cols:

vertices[cursor:cursor + shape_size] = (shape_vertices +

(col_pos, row_pos))

codes[cursor:cursor + shape_size] = shape_codes

cursor += shape_size

if not self.filled:

vertices[cursor:cursor + shape_size] = (inner_vertices +

(col_pos, row_pos))

codes[cursor:cursor + shape_size] = shape_codes

cursor += shape_size

class Circles(Shapes):

def __init__(self, hatch, density):

path = Path.unit_circle()

self.shape_vertices = path.vertices

self.shape_codes = path.codes

Shapes.__init__(self, hatch, density)

class SmallCircles(Circles):

size = 0.2

def __init__(self, hatch, density):

self.num_rows = (hatch.count('o')) * density

Circles.__init__(self, hatch, density)

class LargeCircles(Circles):

size = 0.35

def __init__(self, hatch, density):

self.num_rows = (hatch.count('O')) * density

Circles.__init__(self, hatch, density)

class SmallFilledCircles(SmallCircles):

size = 0.1

filled = True

def __init__(self, hatch, density):

self.num_rows = (hatch.count('.')) * density

Circles.__init__(self, hatch, density)

class Stars(Shapes):

size = 1.0 / 3.0

filled = True

def __init__(self, hatch, density):

self.num_rows = (hatch.count('*')) * density

path = Path.unit_regular_star(5)

self.shape_vertices = path.vertices

self.shape_codes = np.ones(len(self.shape_vertices)) * Path.LINETO

self.shape_codes[0] = Path.MOVETO

Shapes.__init__(self, hatch, density)

_hatch_types = [

HorizontalHatch,

VerticalHatch,

NorthEastHatch,

SouthEastHatch,

SmallCircles,

LargeCircles,

SmallFilledCircles,

Stars

]

def get_path(hatchpattern, density=6):

"""

Given a hatch specifier, *hatchpattern*, generates Path to render

the hatch in a unit square. *density* is the number of lines per

unit square.

"""

density = int(density)

patterns = [hatch_type(hatchpattern, density)

for hatch_type in _hatch_types]

num_vertices = sum([pattern.num_vertices for pattern in patterns])

if num_vertices == 0:

return Path(np.empty((0, 2)))

vertices = np.empty((num_vertices, 2))

codes = np.empty((num_vertices,), np.uint8)

cursor = 0

for pattern in patterns:

if pattern.num_vertices != 0:

vertices_chunk = vertices[cursor:cursor + pattern.num_vertices]

codes_chunk = codes[cursor:cursor + pattern.num_vertices]

pattern.set_vertices_and_codes(vertices_chunk, codes_chunk)

cursor += pattern.num_vertices

return Path(vertices, codes)

matplotlib/lib/matplotlib/hatch.py at master · feisuo/matplotlib · GitHub

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