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Implement draw_markers in the cairo backend. #2370

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Merged
WeatherGod merged 2 commits into from
Jun 18, 2016
Merged

Implement draw_markers in the cairo backend. #2370

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0cc8287
Implement draw_markers in the cairo backend.
benzea Sep 3, 2013
c52e357
cairo backend: Flush out mark drawing every 1000 marks.
benzea Sep 3, 2013
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43 changes: 43 additions & 0 deletions lib/matplotlib/backends/backend_cairo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -152,6 +152,49 @@ def draw_path(self, gc, path, transform, rgbFace=None):

self._fill_and_stroke(ctx, rgbFace, gc.get_alpha(), gc.get_forced_alpha())

def draw_markers(self, gc, marker_path, marker_trans, path, transform, rgbFace=None):
ctx = gc.ctx

ctx.new_path()
# Create the path for the marker; it needs to be flipped here already!
self.convert_path(ctx, marker_path, marker_trans + Affine2D().scale(1.0, -1.0))
marker_path = ctx.copy_path_flat()

# Figure out whether the path has a fill
x1, y1, x2, y2 = ctx.fill_extents()
if x1 == 0 and y1 == 0 and x2 == 0 and y2 == 0:
filled = False
# No fill, just unset this (so we don't try to fill it later on)
rgbFace = None
else:
filled = True

transform = transform + \
Affine2D().scale(1.0, -1.0).translate(0, self.height)

ctx.new_path()
for i, (vertices, codes) in enumerate(path.iter_segments(transform, simplify=False)):
if len(vertices):
x, y = vertices[-2:]
ctx.save()

# Translate and apply path
ctx.translate(x, y)
ctx.append_path(marker_path)

ctx.restore()

# Slower code path if there is a fill; we need to draw
# the fill and stroke for each marker at the same time.
# Also flush out the drawing every once in a while to
# prevent the paths from getting way too long.
if filled or i % 1000 == 0:
self._fill_and_stroke(ctx, rgbFace, gc.get_alpha(), gc.get_forced_alpha())

# Fast path, if there is no fill, draw everything in one step
if not filled:
self._fill_and_stroke(ctx, rgbFace, gc.get_alpha(), gc.get_forced_alpha())

def draw_image(self, gc, x, y, im):
# bbox - not currently used
if _debug: print('%s.%s()' % (self.__class__.__name__, _fn_name()))
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