def make_histogram(self, data, show_axis=None, distance=True):
color = colors.Category.CAT20C[0]
matplotlib.rcParams.update({'font.size': 9.5})
figure = Figure(frameon=False, figsize=(4, 2), dpi=72, edgecolor=color)
specs = matplotlib.gridspec.GridSpec(ncols=8, nrows=1, figure=figure)
plot = figure.add_subplot(specs[0, 1:7])
plot.patch.set_alpha(1.0)
adjust_spines(plot, ['left'], color)
formatter = FormatStrFormatter('%g')
plot.yaxis.set_major_formatter(formatter)
plot.yaxis.set_major_locator(MaxNLocator(5))
if distance:
plot.plot(data[:, 0], data[:, 1], lw=0.75)
else:
plot.vlines(data[:, 0], 0, data[:, 1])
plot.set_xlim(min(data[:, 0]), max(data[:, 0]))
# Ask matplotlib to render the figure to a bitmap using the Agg backend
canvas = FigureCanvasCairo(figure)
width, height = canvas.get_width_height()
renderer = RendererCairo(canvas.figure.dpi)
renderer.set_width_height(width, height)
self.plot_surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width,
height)
renderer.set_ctx_from_surface(self.plot_surface)
canvas.figure.draw(renderer)
self.show_histogram = True
def draw_matplotlib_figure(self, figure):
"""Draws matplotlib figure to context"""
class CustomRendererCairo(RendererCairo):
"""Workaround for older versins with limited draw path length"""
if sys.byteorder == 'little':
BYTE_FORMAT = 0 # BGRA
else:
BYTE_FORMAT = 1 # ARGB
def draw_path(self, gc, path, transform, rgbFace=None):
ctx = gc.ctx
transform = transform + Affine2D().scale(1.0, -1.0).\
translate(0, self.height)
ctx.new_path()
self.convert_path(ctx, path, transform)
try:
self._fill_and_stroke(ctx, rgbFace, gc.get_alpha(),
gc.get_forced_alpha())
except AttributeError:
# Workaround for some Windiws version of Cairo
self._fill_and_stroke(ctx, rgbFace, gc.get_alpha())
def draw_image(self, gc, x, y, im):
# bbox - not currently used
rows, cols, buf = im.color_conv(self.BYTE_FORMAT)
surface = cairo.ImageSurface.create_for_data(
buf, cairo.FORMAT_ARGB32, cols, rows, cols * 4)
ctx = gc.ctx
y = self.height - y - rows
ctx.save()
ctx.set_source_surface(surface, x, y)
if gc.get_alpha() != 1.0:
ctx.paint_with_alpha(gc.get_alpha())
else:
ctx.paint()
ctx.restore()
if pyplot is None:
# Matplotlib is not installed
return
FigureCanvasCairo(figure)
dpi = float(figure.dpi)
# Set a border so that the figure is not cut off at the cell border
border_x = 200 / (self.rect[2] / dpi)**2
border_y = 200 / (self.rect[3] / dpi)**2
width = (self.rect[2] - 2 * border_x) / dpi
height = (self.rect[3] - 2 * border_y) / dpi
figure.set_figwidth(width)
figure.set_figheight(height)
renderer = CustomRendererCairo(dpi)
renderer.set_width_height(width, height)
renderer.gc.ctx = self.context
renderer.text_ctx = self.context
self.context.save()
self.context.translate(border_x, border_y + height * dpi)
figure.draw(renderer)
self.context.restore()
