use qpolygonf underlying buffer as backstore
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KIU Shueng Chuan
Ogi Moore
parent
270fc59cab
commit
8f4104a9ab
@ -1703,10 +1703,26 @@ def arrayToQPath(x, y, connect='all', finiteCheck=True):
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path = QtGui.QPainterPath()
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n = x.shape[0]
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backstore = bytearray(4 + n*20 + 8)
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arr = np.frombuffer(backstore, dtype=[('c', '>i4'), ('x', '>f8'), ('y', '>f8')],
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count=n, offset=4)
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struct.pack_into('>i', backstore, 0, n)
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connect_array = None
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if isinstance(connect, np.ndarray):
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# make connect argument contain only str type
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connect_array, connect = connect, 'array'
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qtver = [int(x) for x in QtVersion.split('.')]
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qt6 = qtver[0] == 6
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use_qpolygonf = connect == 'all' or (qt6 and connect in ['pairs', 'finite'])
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if use_qpolygonf:
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backstore = create_qpolygonf(n)
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arr = np.frombuffer(ndarray_from_qpolygonf(backstore), dtype=[('x', 'f8'), ('y', 'f8')])
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else:
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backstore = bytearray(4 + n*20 + 8)
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arr = np.frombuffer(backstore, dtype=[('c', '>i4'), ('x', '>f8'), ('y', '>f8')],
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count=n, offset=4)
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struct.pack_into('>i', backstore, 0, n)
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# cStart, fillRule (Qt.OddEvenFill)
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struct.pack_into('>ii', backstore, 4+n*20, 0, 0)
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# Fill array with vertex values
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arr['x'] = x
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@ -1715,10 +1731,8 @@ def arrayToQPath(x, y, connect='all', finiteCheck=True):
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# inf/nans completely prevent the plot from being displayed starting on
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# Qt version 5.12.3; these must now be manually cleaned out.
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isfinite = None
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qtver = [int(x) for x in QtVersion.split('.')]
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qt6 = qtver[0] == 6
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if eq(connect, 'finite') and qt6:
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if connect == 'finite' and qt6:
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# we must preserve NaN values here
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pass
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elif qtver >= [5, 12, 3] and finiteCheck:
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@ -1736,29 +1750,23 @@ def arrayToQPath(x, y, connect='all', finiteCheck=True):
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arr[:] = arr[:][idx]
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# decide which points are connected by lines
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if eq(connect, 'all'):
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polygon = arrayToQPolygonF(
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arr['x'],
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arr['y']
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)
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path.addPolygon(polygon)
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if connect == 'all':
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path.addPolygon(backstore)
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return path
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elif eq(connect, 'pairs'):
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elif connect == 'pairs':
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if qt6:
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if n % 2 == 1:
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arr = arr[:-1]
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nans = np.broadcast_to(np.nan, (n // 2, 1))
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if n % 2 == 0:
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xs = np.column_stack([arr['x'].reshape((-1, 2)), nans]).ravel()
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ys = np.column_stack([arr['y'].reshape((-1, 2)), nans]).ravel()
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else:
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xs = np.column_stack([arr['x'][:-1].reshape((-1, 2)), nans]).ravel()
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ys = np.column_stack([arr['y'][:-1].reshape((-1, 2)), nans]).ravel()
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xs = np.column_stack([arr['x'].reshape((-1, 2)), nans]).ravel()
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ys = np.column_stack([arr['y'].reshape((-1, 2)), nans]).ravel()
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polygon = arrayToQPolygonF(xs, ys)
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path.addPolygon(polygon)
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return path
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else:
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arr[:]['c'][::2] = 0
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arr[:]['c'][1::2] = 1 # connect every 2nd point to every 1st one
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elif eq(connect, 'finite'):
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arr['c'][::2] = 0
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arr['c'][1::2] = 1 # connect every 2nd point to every 1st one
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elif connect == 'finite':
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# Let's call a point with either x or y being nan is an invalid point.
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# A point will anyway not connect to an invalid point regardless of the
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# 'c' value of the invalid point. Therefore, we should set 'c' to 0 for
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@ -1769,24 +1777,21 @@ def arrayToQPath(x, y, connect='all', finiteCheck=True):
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argNaNs = np.argwhere(isfinite)
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first = 0 if len(argNaNs) == 0 else argNaNs.item(0)
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# if found, use the portion of the array from that point on
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polygon = arrayToQPolygonF(x[first:], y[first:])
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path.addPolygon(polygon)
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# if found, set first element to first found finite element
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arr[0] = arr[first]
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path.addPolygon(backstore)
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return path
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else:
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if isfinite is None:
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isfinite = np.isfinite(x) & np.isfinite(y)
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arr[1:]['c'] = isfinite[:-1]
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elif isinstance(connect, np.ndarray):
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arr[1:]['c'] = connect[:-1]
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elif connect == 'array':
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arr[1:]['c'] = connect_array[:-1]
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else:
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raise Exception('connect argument must be "all", "pairs", "finite", or array')
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arr[0]['c'] = 0 # the first vertex has no previous vertex to connect
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# cStart, fillRule (Qt.OddEvenFill)
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struct.pack_into('>ii', backstore, 4+n*20, 0, 0)
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# create QDataStream object and stream into QPainterPath
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path.strn = backstore
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if QT_LIB == "PyQt6":
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@ -1799,6 +1804,29 @@ def arrayToQPath(x, y, connect='all', finiteCheck=True):
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ds >> path
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return path
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def ndarray_from_qpolygonf(polyline):
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nbytes = 2 * len(polyline) * 8
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if QT_LIB == "PySide2":
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buffer = Qt.shiboken2.VoidPtr(polyline.data(), nbytes, True)
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elif QT_LIB == "PySide6":
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buffer = Qt.shiboken6.VoidPtr(polyline.data(), nbytes, True)
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else:
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buffer = polyline.data()
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buffer.setsize(nbytes)
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memory = np.frombuffer(buffer, np.double).reshape((-1, 2))
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return memory
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def create_qpolygonf(size):
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if QtVersion.startswith("5"):
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polyline = QtGui.QPolygonF(size)
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else:
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polyline = QtGui.QPolygonF()
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if QT_LIB == "PySide6":
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polyline.resize(size)
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else:
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polyline.fill(QtCore.QPointF(), size)
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return polyline
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def arrayToQPolygonF(x, y):
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"""
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Utility function to convert two 1D-NumPy arrays representing curve data
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@ -1831,24 +1859,8 @@ def arrayToQPolygonF(x, y):
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):
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raise ValueError("Arguments must be 1D and the same size")
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size = x.size
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if QtVersion.startswith("5"):
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polyline = QtGui.QPolygonF(size)
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else:
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polyline = QtGui.QPolygonF()
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if QT_LIB == "PySide6":
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polyline.resize(size)
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else:
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polyline.fill(QtCore.QPointF(), size)
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nbytes = 2 * size * 8
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if QT_LIB == "PySide2":
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buffer = Qt.shiboken2.VoidPtr(polyline.data(), nbytes, True)
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elif QT_LIB == "PySide6":
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buffer = Qt.shiboken6.VoidPtr(polyline.data(), nbytes, True)
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else:
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buffer = polyline.data()
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buffer.setsize(nbytes)
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memory = np.frombuffer(buffer, np.double).reshape((-1, 2))
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polyline = create_qpolygonf(size)
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memory = ndarray_from_qpolygonf(polyline)
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memory[:, 0] = x
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memory[:, 1] = y
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return polyline
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