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Mini Shell
Mini Shell
import ctypes
from .backend_cairo import cairo, FigureCanvasCairo, RendererCairo
from .backend_qt import QtCore, QtGui, _BackendQT, FigureCanvasQT
from .qt_compat import QT_API, _enum, _setDevicePixelRatio
class FigureCanvasQTCairo(FigureCanvasQT, FigureCanvasCairo):
def __init__(self, figure=None):
super().__init__(figure=figure)
self._renderer = RendererCairo(self.figure.dpi)
self._renderer.set_width_height(-1, -1) # Invalid values.
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_ctx_from_surface(surface)
self._renderer.set_width_height(width, height)
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,
_enum("QtGui.QImage.Format").Format_ARGB32_Premultiplied)
# Adjust the buf reference count to work around a memory leak bug in
# QImage under PySide.
if QT_API in ('PySide', 'PySide2'):
if QtCore.__version_info__ < (5, 12):
ctypes.c_long.from_address(id(buf)).value = 1
_setDevicePixelRatio(qimage, 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
Zerion Mini Shell 1.0