def _create_png(figure):
"""\
Given the matplotlib figure, generate the PNG data for it.
"""
# Draw the image
canvas = matplotlib.backends.backend_agg.FigureCanvasAgg(figure)
canvas.draw()
size = canvas.get_renderer().get_canvas_width_height()
image_as_string = canvas.tostring_rgb()
image = PIL.Image.fromstring('RGB', size, image_as_string, 'raw', 'RGB', 0,
1)
image_background = PIL.Image.new(image.mode, image.size,
figure.get_facecolor())
# Crop the image to remove surrounding whitespace
non_whitespace = PIL.ImageChops.difference(image, image_background)
bounding_box = non_whitespace.getbbox()
image = image.crop(bounding_box)
image_data = StringIO.StringIO()
image.save(image_data, format='PNG')
return image_data.getvalue(), bounding_box
def _create_png(figure):
"""
Given the matplotlib figure, generate the PNG data for it.
"""
# Draw the image
canvas = matplotlib.backends.backend_agg.FigureCanvasAgg(figure)
canvas.draw()
size = canvas.get_renderer().get_canvas_width_height()
image_as_string = canvas.tostring_rgb()
image = PIL.Image.fromstring('RGB', size, image_as_string, 'raw', 'RGB', 0,
1)
image_background = PIL.Image.new(image.mode, image.size,
figure.get_facecolor())
# Crop the image to remove surrounding whitespace
non_whitespace = PIL.ImageChops.difference(image, image_background)
bounding_box = non_whitespace.getbbox()
image = image.crop(bounding_box)
image_data = StringIO.StringIO()
image.save(image_data, format='PNG')
return image_data.getvalue(), bounding_box