def paintEvent(self, event):
if hasattr(self, "_update_dpi") and self._update_dpi():
return # matplotlib#19123 (<3.4).
# We always repaint the full canvas (doing otherwise would require an
# additional copy of the buffer into a contiguous block, so it's not
# clear it would be faster).
buf = _util.cairo_to_premultiplied_argb32(
self.get_renderer()._get_buffer())
height, width, _ = buf.shape
# The image buffer is not necessarily contiguous, but the padding
# in the ARGB32 case (each scanline is 32-bit aligned) happens to
# match what QImage requires; in the RGBA128F case the documented Qt
# requirement does not seem necessary?
if QtGui.__name__.startswith("PyQt6"):
from PyQt6 import sip
ptr = sip.voidptr(buf)
else:
ptr = buf
qimage = QtGui.QImage(ptr, width, height,
QtGui.QImage.Format(6)) # ARGB32_Premultiplied
getattr(qimage, "setDevicePixelRatio",
lambda _: None)(self.device_pixel_ratio)
# https://bugreports.qt.io/browse/PYSIDE-140
if (QtCore.__name__.startswith("PySide") and QtCore.__version_info__ <
(5, 12)):
ctypes.c_long.from_address(id(buf)).value -= 1
painter = QtGui.QPainter(self)
painter.eraseRect(self.rect())
painter.drawImage(0, 0, qimage)
self._draw_rect_callback(painter)
painter.end()
def __init__(self, parent: Optional[Any] = None) -> None:
""" TODO: Write documentation.
"""
# Initialize Qt widget
super(QtWidgets.QWidget, self).__init__(parent=parent)
# Initialize Panda3D app
super(Panda3dViewer, self).__init__(window_type='offscreen')
# Only accept focus by clicking on widget
self.setFocusPolicy(Qt.ClickFocus)
# Enable mouse control
self.setMouseTracking(True)
self._app.getMousePos = self.getMousePos
self._app.taskMgr.add(self._app.move_orbital_camera_task,
"move_camera_task",
sort=2)
# Create painter to render "screenshot" from panda3d
self.paint_surface = QtGui.QPainter()
# Start event loop
self.clock = QtCore.QTimer()
self.clock.setInterval(1000.0 / FRAMERATE)
self.clock.timeout.connect(self.update)
self.clock.start()