fr/fr_env/lib/python3.8/site-packages/matplotlib/backends/backend_gtk3agg.py

87 lines
2.7 KiB
Python

import numpy as np
from .. import cbook
try:
from . import backend_cairo
except ImportError as e:
raise ImportError('backend Gtk3Agg requires cairo') from e
from . import backend_agg, backend_gtk3
from .backend_cairo import cairo
from .backend_gtk3 import Gtk, _BackendGTK3
from matplotlib import transforms
class FigureCanvasGTK3Agg(backend_gtk3.FigureCanvasGTK3,
backend_agg.FigureCanvasAgg):
def __init__(self, figure):
backend_gtk3.FigureCanvasGTK3.__init__(self, figure)
self._bbox_queue = []
def on_draw_event(self, widget, ctx):
"""GtkDrawable draw event, like expose_event in GTK 2.X."""
allocation = self.get_allocation()
w, h = allocation.width, allocation.height
if not len(self._bbox_queue):
Gtk.render_background(
self.get_style_context(), ctx,
allocation.x, allocation.y,
allocation.width, allocation.height)
bbox_queue = [transforms.Bbox([[0, 0], [w, h]])]
else:
bbox_queue = self._bbox_queue
ctx = backend_cairo._to_context(ctx)
for bbox in bbox_queue:
x = int(bbox.x0)
y = h - int(bbox.y1)
width = int(bbox.x1) - int(bbox.x0)
height = int(bbox.y1) - int(bbox.y0)
buf = cbook._unmultiplied_rgba8888_to_premultiplied_argb32(
np.asarray(self.copy_from_bbox(bbox)))
image = cairo.ImageSurface.create_for_data(
buf.ravel().data, cairo.FORMAT_ARGB32, width, height)
ctx.set_source_surface(image, x, y)
ctx.paint()
if len(self._bbox_queue):
self._bbox_queue = []
return False
def blit(self, bbox=None):
# If bbox is None, blit the entire canvas to gtk. Otherwise
# blit only the area defined by the bbox.
if bbox is None:
bbox = self.figure.bbox
allocation = self.get_allocation()
x = int(bbox.x0)
y = allocation.height - int(bbox.y1)
width = int(bbox.x1) - int(bbox.x0)
height = int(bbox.y1) - int(bbox.y0)
self._bbox_queue.append(bbox)
self.queue_draw_area(x, y, width, height)
def draw(self):
backend_agg.FigureCanvasAgg.draw(self)
super().draw()
def print_png(self, filename, *args, **kwargs):
# Do this so we can save the resolution of figure in the PNG file
agg = self.switch_backends(backend_agg.FigureCanvasAgg)
return agg.print_png(filename, *args, **kwargs)
class FigureManagerGTK3Agg(backend_gtk3.FigureManagerGTK3):
pass
@_BackendGTK3.export
class _BackendGTK3Cairo(_BackendGTK3):
FigureCanvas = FigureCanvasGTK3Agg
FigureManager = FigureManagerGTK3Agg