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49 lines
1.8 KiB
Python
49 lines
1.8 KiB
Python
5 years ago
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import ctypes
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from .backend_cairo import cairo, FigureCanvasCairo, RendererCairo
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from .backend_qt5 import QtCore, QtGui, _BackendQT5, FigureCanvasQT
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from .qt_compat import QT_API
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class FigureCanvasQTCairo(FigureCanvasQT, FigureCanvasCairo):
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def __init__(self, figure):
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super().__init__(figure=figure)
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self._renderer = RendererCairo(self.figure.dpi)
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self._renderer.set_width_height(-1, -1) # Invalid values.
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def draw(self):
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if hasattr(self._renderer.gc, "ctx"):
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self.figure.draw(self._renderer)
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super().draw()
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def paintEvent(self, event):
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self._update_dpi()
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dpi_ratio = self._dpi_ratio
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width = dpi_ratio * self.width()
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height = dpi_ratio * self.height()
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if (width, height) != self._renderer.get_canvas_width_height():
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surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
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self._renderer.set_ctx_from_surface(surface)
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self._renderer.set_width_height(width, height)
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self.figure.draw(self._renderer)
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buf = self._renderer.gc.ctx.get_target().get_data()
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qimage = QtGui.QImage(buf, width, height,
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QtGui.QImage.Format_ARGB32_Premultiplied)
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# Adjust the buf reference count to work around a memory leak bug in
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# QImage under PySide on Python 3.
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if QT_API == 'PySide':
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ctypes.c_long.from_address(id(buf)).value = 1
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if hasattr(qimage, 'setDevicePixelRatio'):
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# Not available on Qt4 or some older Qt5.
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qimage.setDevicePixelRatio(dpi_ratio)
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painter = QtGui.QPainter(self)
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painter.eraseRect(event.rect())
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painter.drawImage(0, 0, qimage)
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self._draw_rect_callback(painter)
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painter.end()
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@_BackendQT5.export
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class _BackendQT5Cairo(_BackendQT5):
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FigureCanvas = FigureCanvasQTCairo
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