| import ctypes |
|
|
| from .backend_cairo import cairo, FigureCanvasCairo |
| from .backend_qt import _BackendQT, FigureCanvasQT |
| from .qt_compat import QT_API, QtCore, QtGui |
|
|
|
|
| class FigureCanvasQTCairo(FigureCanvasCairo, FigureCanvasQT): |
| def draw(self): |
| if hasattr(self._renderer.gc, "ctx"): |
| self._renderer.dpi = self.figure.dpi |
| self.figure.draw(self._renderer) |
| super().draw() |
|
|
| def paintEvent(self, event): |
| width = int(self.device_pixel_ratio * self.width()) |
| height = int(self.device_pixel_ratio * self.height()) |
| if (width, height) != self._renderer.get_canvas_width_height(): |
| surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height) |
| self._renderer.set_context(cairo.Context(surface)) |
| self._renderer.dpi = self.figure.dpi |
| self.figure.draw(self._renderer) |
| buf = self._renderer.gc.ctx.get_target().get_data() |
| if QT_API == "PyQt6": |
| from PyQt6 import sip |
| ptr = int(sip.voidptr(buf)) |
| else: |
| ptr = buf |
| qimage = QtGui.QImage( |
| ptr, width, height, |
| QtGui.QImage.Format.Format_ARGB32_Premultiplied) |
| |
| |
| if QT_API == "PySide2" and QtCore.__version_info__ < (5, 12): |
| ctypes.c_long.from_address(id(buf)).value = 1 |
| qimage.setDevicePixelRatio(self.device_pixel_ratio) |
| painter = QtGui.QPainter(self) |
| painter.eraseRect(event.rect()) |
| painter.drawImage(0, 0, qimage) |
| self._draw_rect_callback(painter) |
| painter.end() |
|
|
|
|
| @_BackendQT.export |
| class _BackendQTCairo(_BackendQT): |
| FigureCanvas = FigureCanvasQTCairo |
|
|
