85 lines
3.0 KiB
Python
85 lines
3.0 KiB
Python
"""
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Render to qt from agg.
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"""
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import ctypes
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from matplotlib.transforms import Bbox
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from .. import cbook
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from .backend_agg import FigureCanvasAgg
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from .backend_qt5 import (
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QtCore, QtGui, QtWidgets, _BackendQT5, FigureCanvasQT, FigureManagerQT,
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NavigationToolbar2QT, backend_version)
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from .qt_compat import QT_API, _setDevicePixelRatio
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class FigureCanvasQTAgg(FigureCanvasAgg, FigureCanvasQT):
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def __init__(self, figure=None):
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# Must pass 'figure' as kwarg to Qt base class.
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super().__init__(figure=figure)
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def paintEvent(self, event):
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"""
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Copy the image from the Agg canvas to the qt.drawable.
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In Qt, all drawing should be done inside of here when a widget is
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shown onscreen.
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"""
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self._draw_idle() # Only does something if a draw is pending.
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# If the canvas does not have a renderer, then give up and wait for
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# FigureCanvasAgg.draw(self) to be called.
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if not hasattr(self, 'renderer'):
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return
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painter = QtGui.QPainter(self)
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try:
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# See documentation of QRect: bottom() and right() are off
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# by 1, so use left() + width() and top() + height().
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rect = event.rect()
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# scale rect dimensions using the screen dpi ratio to get
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# correct values for the Figure coordinates (rather than
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# QT5's coords)
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width = rect.width() * self._dpi_ratio
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height = rect.height() * self._dpi_ratio
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left, top = self.mouseEventCoords(rect.topLeft())
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# shift the "top" by the height of the image to get the
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# correct corner for our coordinate system
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bottom = top - height
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# same with the right side of the image
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right = left + width
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# create a buffer using the image bounding box
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bbox = Bbox([[left, bottom], [right, top]])
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reg = self.copy_from_bbox(bbox)
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buf = cbook._unmultiplied_rgba8888_to_premultiplied_argb32(
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memoryview(reg))
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# clear the widget canvas
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painter.eraseRect(rect)
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qimage = QtGui.QImage(buf, buf.shape[1], buf.shape[0],
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QtGui.QImage.Format_ARGB32_Premultiplied)
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_setDevicePixelRatio(qimage, self._dpi_ratio)
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# set origin using original QT coordinates
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origin = QtCore.QPoint(rect.left(), rect.top())
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painter.drawImage(origin, qimage)
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# Adjust the buf reference count to work around a memory
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# leak bug in QImage under PySide on Python 3.
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if QT_API in ('PySide', 'PySide2'):
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ctypes.c_long.from_address(id(buf)).value = 1
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self._draw_rect_callback(painter)
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finally:
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painter.end()
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def print_figure(self, *args, **kwargs):
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super().print_figure(*args, **kwargs)
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self.draw()
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@_BackendQT5.export
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class _BackendQT5Agg(_BackendQT5):
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FigureCanvas = FigureCanvasQTAgg
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