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from distutils.version import LooseVersion
import numpy as np
from ase.io.eps import EPS
class PNG(EPS):
def write_header(self):
from matplotlib.backends.backend_agg import RendererAgg
try:
from matplotlib.transforms import Value
except ImportError:
dpi = 72
else:
dpi = Value(72)
self.renderer = RendererAgg(self.w, self.h, dpi)
def write_trailer(self):
renderer = self.renderer
if hasattr(renderer._renderer, 'write_png'):
# Old version of matplotlib:
renderer._renderer.write_png(self.filename)
else:
from matplotlib import _png
# buffer_rgba does not accept arguments from version 1.2.0
# https://github.com/matplotlib/matplotlib/commit/f4fee350f9f
import matplotlib
if LooseVersion(matplotlib.__version__) < '1.2.0':
_png.write_png(renderer.buffer_rgba(0, 0),
renderer.width, renderer.height,
self.filename, 72)
else:
x = renderer.buffer_rgba()
try:
_png.write_png(x, self.w, self.h, self.filename, 72)
except TypeError:
x = np.frombuffer(x, np.uint8).reshape(
(int(self.h), int(self.w), 4))
_png.write_png(x, self.filename, 72)
def write_png(filename, atoms, **parameters):
PNG(atoms, **parameters).write(filename)
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