87 lines
3.1 KiB
Python
87 lines
3.1 KiB
Python
"""
|
|
Render to qt from agg.
|
|
"""
|
|
|
|
import ctypes
|
|
|
|
from matplotlib.transforms import Bbox
|
|
|
|
from .. import cbook
|
|
from .backend_agg import FigureCanvasAgg
|
|
from .backend_qt5 import (
|
|
QtCore, QtGui, QtWidgets, _BackendQT5, FigureCanvasQT, FigureManagerQT,
|
|
NavigationToolbar2QT, backend_version)
|
|
from .qt_compat import QT_API, _setDevicePixelRatioF
|
|
|
|
|
|
class FigureCanvasQTAgg(FigureCanvasAgg, FigureCanvasQT):
|
|
|
|
def __init__(self, figure):
|
|
# Must pass 'figure' as kwarg to Qt base class.
|
|
super().__init__(figure=figure)
|
|
|
|
def paintEvent(self, event):
|
|
"""
|
|
Copy the image from the Agg canvas to the qt.drawable.
|
|
|
|
In Qt, all drawing should be done inside of here when a widget is
|
|
shown onscreen.
|
|
"""
|
|
if self._update_dpi():
|
|
# The dpi update triggered its own paintEvent.
|
|
return
|
|
self._draw_idle() # Only does something if a draw is pending.
|
|
|
|
# If the canvas does not have a renderer, then give up and wait for
|
|
# FigureCanvasAgg.draw(self) to be called.
|
|
if not hasattr(self, 'renderer'):
|
|
return
|
|
|
|
painter = QtGui.QPainter(self)
|
|
try:
|
|
# See documentation of QRect: bottom() and right() are off
|
|
# by 1, so use left() + width() and top() + height().
|
|
rect = event.rect()
|
|
# scale rect dimensions using the screen dpi ratio to get
|
|
# correct values for the Figure coordinates (rather than
|
|
# QT5's coords)
|
|
width = rect.width() * self._dpi_ratio
|
|
height = rect.height() * self._dpi_ratio
|
|
left, top = self.mouseEventCoords(rect.topLeft())
|
|
# shift the "top" by the height of the image to get the
|
|
# correct corner for our coordinate system
|
|
bottom = top - height
|
|
# same with the right side of the image
|
|
right = left + width
|
|
# create a buffer using the image bounding box
|
|
bbox = Bbox([[left, bottom], [right, top]])
|
|
reg = self.copy_from_bbox(bbox)
|
|
buf = cbook._unmultiplied_rgba8888_to_premultiplied_argb32(
|
|
memoryview(reg))
|
|
|
|
# clear the widget canvas
|
|
painter.eraseRect(rect)
|
|
|
|
qimage = QtGui.QImage(buf, buf.shape[1], buf.shape[0],
|
|
QtGui.QImage.Format_ARGB32_Premultiplied)
|
|
_setDevicePixelRatioF(qimage, self._dpi_ratio)
|
|
# set origin using original QT coordinates
|
|
origin = QtCore.QPoint(rect.left(), rect.top())
|
|
painter.drawImage(origin, qimage)
|
|
# Adjust the buf reference count to work around a memory
|
|
# leak bug in QImage under PySide on Python 3.
|
|
if QT_API in ('PySide', 'PySide2'):
|
|
ctypes.c_long.from_address(id(buf)).value = 1
|
|
|
|
self._draw_rect_callback(painter)
|
|
finally:
|
|
painter.end()
|
|
|
|
def print_figure(self, *args, **kwargs):
|
|
super().print_figure(*args, **kwargs)
|
|
self.draw()
|
|
|
|
|
|
@_BackendQT5.export
|
|
class _BackendQT5Agg(_BackendQT5):
|
|
FigureCanvas = FigureCanvasQTAgg
|