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import ctypes |
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from .backend_cairo import cairo, FigureCanvasCairo |
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from .backend_qt import _BackendQT, FigureCanvasQT |
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from .qt_compat import QT_API, QtCore, QtGui |
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class FigureCanvasQTCairo(FigureCanvasCairo, FigureCanvasQT): |
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def draw(self): |
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if hasattr(self._renderer.gc, "ctx"): |
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self._renderer.dpi = self.figure.dpi |
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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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width = int(self.device_pixel_ratio * self.width()) |
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height = int(self.device_pixel_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_context(cairo.Context(surface)) |
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self._renderer.dpi = self.figure.dpi |
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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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if QT_API == "PyQt6": |
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from PyQt6 import sip |
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ptr = int(sip.voidptr(buf)) |
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else: |
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ptr = buf |
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qimage = QtGui.QImage( |
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ptr, width, height, |
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QtGui.QImage.Format.Format_ARGB32_Premultiplied) |
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if QT_API == "PySide2" and QtCore.__version_info__ < (5, 12): |
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ctypes.c_long.from_address(id(buf)).value = 1 |
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qimage.setDevicePixelRatio(self.device_pixel_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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@_BackendQT.export |
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class _BackendQTCairo(_BackendQT): |
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FigureCanvas = FigureCanvasQTCairo |
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