from ..Qt import QtGui, QtCore, QT_LIB
if QT_LIB in ['PyQt4', 'PyQt5']:
import sip
from .. import multiprocess as mp
from .GraphicsView import GraphicsView
from .. import CONFIG_OPTIONS
import numpy as np
import mmap, tempfile, ctypes, atexit, sys, random
__all__ = ['RemoteGraphicsView']
class SerializableWheelEvent:
"""
Contains all information of a QWheelEvent, is serializable and can generate QWheelEvents.
Methods have the functionality of their QWheelEvent equivalent.
"""
def __init__(self, _pos, _globalPos, _delta, _buttons, _modifiers, _orientation):
self._pos = _pos
self._globalPos = _globalPos
self._delta = _delta
self._buttons = _buttons
self._modifiers = _modifiers
self._orientation_vertical = _orientation == QtCore.Qt.Vertical
def pos(self):
return self._pos
def globalPos(self):
return self._globalPos
def delta(self):
return self._delta
def orientation(self):
if self._orientation_vertical:
return QtCore.Qt.Vertical
else:
return QtCore.Qt.Horizontal
def angleDelta(self):
if self._orientation_vertical:
return QtCore.QPoint(0, self._delta)
else:
return QtCore.QPoint(self._delta, 0)
def buttons(self):
return QtCore.Qt.MouseButtons(self._buttons)
def modifiers(self):
return QtCore.Qt.KeyboardModifiers(self._modifiers)
def toQWheelEvent(self):
"""
Generate QWheelEvent from SerializableWheelEvent.
"""
if QT_LIB in ['PyQt4', 'PySide']:
return QtGui.QWheelEvent(self.pos(), self.globalPos(), self.delta(), self.buttons(), self.modifiers(), self.orientation())
else:
return QtGui.QWheelEvent(self.pos(), self.globalPos(), QtCore.QPoint(), self.angleDelta(), self.delta(), self.orientation(), self.buttons(), self.modifiers())
[docs]class RemoteGraphicsView(QtGui.QWidget):
"""
Replacement for GraphicsView that does all scene management and rendering on a remote process,
while displaying on the local widget.
GraphicsItems must be created by proxy to the remote process.
"""
[docs] def __init__(self, parent=None, *args, **kwds):
"""
The keyword arguments 'useOpenGL' and 'backgound', if specified, are passed to the remote
GraphicsView.__init__(). All other keyword arguments are passed to multiprocess.QtProcess.__init__().
"""
self._img = None
self._imgReq = None
self._sizeHint = (640,480) ## no clue why this is needed, but it seems to be the default sizeHint for GraphicsView.
## without it, the widget will not compete for space against another GraphicsView.
QtGui.QWidget.__init__(self)
# separate local keyword arguments from remote.
remoteKwds = {}
for kwd in ['useOpenGL', 'background']:
if kwd in kwds:
remoteKwds[kwd] = kwds.pop(kwd)
self._proc = mp.QtProcess(**kwds)
self.pg = self._proc._import('pyqtgraph')
self.pg.setConfigOptions(**CONFIG_OPTIONS)
rpgRemote = self._proc._import('pyqtgraph.widgets.RemoteGraphicsView')
self._view = rpgRemote.Renderer(*args, **remoteKwds)
self._view._setProxyOptions(deferGetattr=True)
self.setFocusPolicy(QtCore.Qt.StrongFocus)
self.setSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding)
self.setMouseTracking(True)
self.shm = None
shmFileName = self._view.shmFileName()
if sys.platform.startswith('win'):
self.shmtag = shmFileName
else:
self.shmFile = open(shmFileName, 'r')
self._view.sceneRendered.connect(mp.proxy(self.remoteSceneChanged)) #, callSync='off'))
## Note: we need synchronous signals
## even though there is no return value--
## this informs the renderer that it is
## safe to begin rendering again.
for method in ['scene', 'setCentralItem']:
setattr(self, method, getattr(self._view, method))
def resizeEvent(self, ev):
ret = QtGui.QWidget.resizeEvent(self, ev)
self._view.resize(self.size(), _callSync='off')
return ret
def sizeHint(self):
return QtCore.QSize(*self._sizeHint)
def remoteSceneChanged(self, data):
w, h, size, newfile = data
#self._sizeHint = (whint, hhint)
if self.shm is None or self.shm.size != size:
if self.shm is not None:
self.shm.close()
if sys.platform.startswith('win'):
self.shmtag = newfile ## on windows, we create a new tag for every resize
self.shm = mmap.mmap(-1, size, self.shmtag) ## can't use tmpfile on windows because the file can only be opened once.
elif sys.platform == 'darwin':
self.shmFile.close()
self.shmFile = open(self._view.shmFileName(), 'r')
self.shm = mmap.mmap(self.shmFile.fileno(), size, mmap.MAP_SHARED, mmap.PROT_READ)
else:
self.shm = mmap.mmap(self.shmFile.fileno(), size, mmap.MAP_SHARED, mmap.PROT_READ)
self.shm.seek(0)
data = self.shm.read(w*h*4)
self._img = QtGui.QImage(data, w, h, QtGui.QImage.Format_ARGB32)
self._img.data = data # data must be kept alive or PySide 1.2.1 (and probably earlier) will crash.
self.update()
def paintEvent(self, ev):
if self._img is None:
return
p = QtGui.QPainter(self)
p.drawImage(self.rect(), self._img, QtCore.QRect(0, 0, self._img.width(), self._img.height()))
p.end()
def mousePressEvent(self, ev):
self._view.mousePressEvent(int(ev.type()), ev.pos(), ev.pos(), int(ev.button()), int(ev.buttons()), int(ev.modifiers()), _callSync='off')
ev.accept()
return QtGui.QWidget.mousePressEvent(self, ev)
def mouseReleaseEvent(self, ev):
self._view.mouseReleaseEvent(int(ev.type()), ev.pos(), ev.pos(), int(ev.button()), int(ev.buttons()), int(ev.modifiers()), _callSync='off')
ev.accept()
return QtGui.QWidget.mouseReleaseEvent(self, ev)
def mouseMoveEvent(self, ev):
self._view.mouseMoveEvent(int(ev.type()), ev.pos(), ev.pos(), int(ev.button()), int(ev.buttons()), int(ev.modifiers()), _callSync='off')
ev.accept()
return QtGui.QWidget.mouseMoveEvent(self, ev)
def wheelEvent(self, ev):
delta = 0
orientation = QtCore.Qt.Horizontal
if QT_LIB in ['PyQt4', 'PySide']:
delta = ev.delta()
orientation = ev.orientation()
else:
delta = ev.angleDelta().x()
if delta == 0:
orientation = QtCore.Qt.Vertical
delta = ev.angleDelta().y()
serializableEvent = SerializableWheelEvent(ev.pos(), ev.pos(), delta, int(ev.buttons()), int(ev.modifiers()), orientation)
self._view.wheelEvent(serializableEvent, _callSync='off')
ev.accept()
return QtGui.QWidget.wheelEvent(self, ev)
def keyEvent(self, ev):
if self._view.keyEvent(int(ev.type()), int(ev.modifiers()), text, autorep, count):
ev.accept()
return QtGui.QWidget.keyEvent(self, ev)
def enterEvent(self, ev):
self._view.enterEvent(int(ev.type()), _callSync='off')
return QtGui.QWidget.enterEvent(self, ev)
def leaveEvent(self, ev):
self._view.leaveEvent(int(ev.type()), _callSync='off')
return QtGui.QWidget.leaveEvent(self, ev)
[docs] def remoteProcess(self):
"""Return the remote process handle. (see multiprocess.remoteproxy.RemoteEventHandler)"""
return self._proc
[docs] def close(self):
"""Close the remote process. After this call, the widget will no longer be updated."""
self._proc.close()
class Renderer(GraphicsView):
## Created by the remote process to handle render requests
sceneRendered = QtCore.Signal(object)
def __init__(self, *args, **kwds):
## Create shared memory for rendered image
#pg.dbg(namespace={'r': self})
if sys.platform.startswith('win'):
self.shmtag = "pyqtgraph_shmem_" + ''.join([chr((random.getrandbits(20)%25) + 97) for i in range(20)])
self.shm = mmap.mmap(-1, mmap.PAGESIZE, self.shmtag) # use anonymous mmap on windows
else:
self.shmFile = tempfile.NamedTemporaryFile(prefix='pyqtgraph_shmem_')
self.shmFile.write(b'\x00' * (mmap.PAGESIZE+1))
self.shmFile.flush()
fd = self.shmFile.fileno()
self.shm = mmap.mmap(fd, mmap.PAGESIZE, mmap.MAP_SHARED, mmap.PROT_WRITE)
atexit.register(self.close)
GraphicsView.__init__(self, *args, **kwds)
self.scene().changed.connect(self.update)
self.img = None
self.renderTimer = QtCore.QTimer()
self.renderTimer.timeout.connect(self.renderView)
self.renderTimer.start(16)
def close(self):
self.shm.close()
if not sys.platform.startswith('win'):
self.shmFile.close()
def shmFileName(self):
if sys.platform.startswith('win'):
return self.shmtag
else:
return self.shmFile.name
def update(self):
self.img = None
return GraphicsView.update(self)
def resize(self, size):
oldSize = self.size()
GraphicsView.resize(self, size)
self.resizeEvent(QtGui.QResizeEvent(size, oldSize))
self.update()
def renderView(self):
if self.img is None:
## make sure shm is large enough and get its address
if self.width() == 0 or self.height() == 0:
return
size = self.width() * self.height() * 4
if size > self.shm.size():
if sys.platform.startswith('win'):
## windows says "WindowsError: [Error 87] the parameter is incorrect" if we try to resize the mmap
self.shm.close()
## it also says (sometimes) 'access is denied' if we try to reuse the tag.
self.shmtag = "pyqtgraph_shmem_" + ''.join([chr((random.getrandbits(20)%25) + 97) for i in range(20)])
self.shm = mmap.mmap(-1, size, self.shmtag)
elif sys.platform == 'darwin':
self.shm.close()
self.shmFile.close()
self.shmFile = tempfile.NamedTemporaryFile(prefix='pyqtgraph_shmem_')
self.shmFile.write(b'\x00' * (size + 1))
self.shmFile.flush()
self.shm = mmap.mmap(self.shmFile.fileno(), size, mmap.MAP_SHARED, mmap.PROT_WRITE)
else:
self.shm.resize(size)
## render the scene directly to shared memory
if QT_LIB in ['PySide', 'PySide2']:
ch = ctypes.c_char.from_buffer(self.shm, 0)
#ch = ctypes.c_char_p(address)
self.img = QtGui.QImage(ch, self.width(), self.height(), QtGui.QImage.Format_ARGB32)
else:
address = ctypes.addressof(ctypes.c_char.from_buffer(self.shm, 0))
# different versions of pyqt have different requirements here..
try:
self.img = QtGui.QImage(sip.voidptr(address), self.width(), self.height(), QtGui.QImage.Format_ARGB32)
except TypeError:
try:
self.img = QtGui.QImage(memoryview(buffer(self.shm)), self.width(), self.height(), QtGui.QImage.Format_ARGB32)
except TypeError:
# Works on PyQt 4.9.6
self.img = QtGui.QImage(address, self.width(), self.height(), QtGui.QImage.Format_ARGB32)
self.img.fill(0xffffffff)
p = QtGui.QPainter(self.img)
self.render(p, self.viewRect(), self.rect())
p.end()
self.sceneRendered.emit((self.width(), self.height(), self.shm.size(), self.shmFileName()))
def mousePressEvent(self, typ, pos, gpos, btn, btns, mods):
typ = QtCore.QEvent.Type(typ)
btn = QtCore.Qt.MouseButton(btn)
btns = QtCore.Qt.MouseButtons(btns)
mods = QtCore.Qt.KeyboardModifiers(mods)
return GraphicsView.mousePressEvent(self, QtGui.QMouseEvent(typ, pos, gpos, btn, btns, mods))
def mouseMoveEvent(self, typ, pos, gpos, btn, btns, mods):
typ = QtCore.QEvent.Type(typ)
btn = QtCore.Qt.MouseButton(btn)
btns = QtCore.Qt.MouseButtons(btns)
mods = QtCore.Qt.KeyboardModifiers(mods)
return GraphicsView.mouseMoveEvent(self, QtGui.QMouseEvent(typ, pos, gpos, btn, btns, mods))
def mouseReleaseEvent(self, typ, pos, gpos, btn, btns, mods):
typ = QtCore.QEvent.Type(typ)
btn = QtCore.Qt.MouseButton(btn)
btns = QtCore.Qt.MouseButtons(btns)
mods = QtCore.Qt.KeyboardModifiers(mods)
return GraphicsView.mouseReleaseEvent(self, QtGui.QMouseEvent(typ, pos, gpos, btn, btns, mods))
def wheelEvent(self, ev):
return GraphicsView.wheelEvent(self, ev.toQWheelEvent())
def keyEvent(self, typ, mods, text, autorep, count):
typ = QtCore.QEvent.Type(typ)
mods = QtCore.Qt.KeyboardModifiers(mods)
GraphicsView.keyEvent(self, QtGui.QKeyEvent(typ, mods, text, autorep, count))
return ev.accepted()
def enterEvent(self, typ):
ev = QtCore.QEvent(QtCore.QEvent.Type(typ))
return GraphicsView.enterEvent(self, ev)
def leaveEvent(self, typ):
ev = QtCore.QEvent(QtCore.QEvent.Type(typ))
return GraphicsView.leaveEvent(self, ev)