/usr/lib/python2.7/dist-packages/pyqtgraph/graphicsItems/CurvePoint.py is in python-pyqtgraph 0.9.10-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | from ..Qt import QtGui, QtCore
from . import ArrowItem
import numpy as np
from ..Point import Point
import weakref
from .GraphicsObject import GraphicsObject
__all__ = ['CurvePoint', 'CurveArrow']
class CurvePoint(GraphicsObject):
"""A GraphicsItem that sets its location to a point on a PlotCurveItem.
Also rotates to be tangent to the curve.
The position along the curve is a Qt property, and thus can be easily animated.
Note: This class does not display anything; see CurveArrow for an applied example
"""
def __init__(self, curve, index=0, pos=None, rotate=True):
"""Position can be set either as an index referring to the sample number or
the position 0.0 - 1.0
If *rotate* is True, then the item rotates to match the tangent of the curve.
"""
GraphicsObject.__init__(self)
#QObjectWorkaround.__init__(self)
self._rotate = rotate
self.curve = weakref.ref(curve)
self.setParentItem(curve)
self.setProperty('position', 0.0)
self.setProperty('index', 0)
if hasattr(self, 'ItemHasNoContents'):
self.setFlags(self.flags() | self.ItemHasNoContents)
if pos is not None:
self.setPos(pos)
else:
self.setIndex(index)
def setPos(self, pos):
self.setProperty('position', float(pos))## cannot use numpy types here, MUST be python float.
def setIndex(self, index):
self.setProperty('index', int(index)) ## cannot use numpy types here, MUST be python int.
def event(self, ev):
if not isinstance(ev, QtCore.QDynamicPropertyChangeEvent) or self.curve() is None:
return False
if ev.propertyName() == 'index':
index = self.property('index')
if 'QVariant' in repr(index):
index = index.toInt()[0]
elif ev.propertyName() == 'position':
index = None
else:
return False
(x, y) = self.curve().getData()
if index is None:
#print ev.propertyName(), self.property('position').toDouble()[0], self.property('position').typeName()
pos = self.property('position')
if 'QVariant' in repr(pos): ## need to support 2 APIs :(
pos = pos.toDouble()[0]
index = (len(x)-1) * np.clip(pos, 0.0, 1.0)
if index != int(index): ## interpolate floating-point values
i1 = int(index)
i2 = np.clip(i1+1, 0, len(x)-1)
s2 = index-i1
s1 = 1.0-s2
newPos = (x[i1]*s1+x[i2]*s2, y[i1]*s1+y[i2]*s2)
else:
index = int(index)
i1 = np.clip(index-1, 0, len(x)-1)
i2 = np.clip(index+1, 0, len(x)-1)
newPos = (x[index], y[index])
p1 = self.parentItem().mapToScene(QtCore.QPointF(x[i1], y[i1]))
p2 = self.parentItem().mapToScene(QtCore.QPointF(x[i2], y[i2]))
ang = np.arctan2(p2.y()-p1.y(), p2.x()-p1.x()) ## returns radians
self.resetTransform()
if self._rotate:
self.rotate(180+ ang * 180 / np.pi) ## takes degrees
QtGui.QGraphicsItem.setPos(self, *newPos)
return True
def boundingRect(self):
return QtCore.QRectF()
def paint(self, *args):
pass
def makeAnimation(self, prop='position', start=0.0, end=1.0, duration=10000, loop=1):
anim = QtCore.QPropertyAnimation(self, prop)
anim.setDuration(duration)
anim.setStartValue(start)
anim.setEndValue(end)
anim.setLoopCount(loop)
return anim
class CurveArrow(CurvePoint):
"""Provides an arrow that points to any specific sample on a PlotCurveItem.
Provides properties that can be animated."""
def __init__(self, curve, index=0, pos=None, **opts):
CurvePoint.__init__(self, curve, index=index, pos=pos)
if opts.get('pxMode', True):
opts['pxMode'] = False
self.setFlags(self.flags() | self.ItemIgnoresTransformations)
opts['angle'] = 0
self.arrow = ArrowItem.ArrowItem(**opts)
self.arrow.setParentItem(self)
def setStyle(self, **opts):
return self.arrow.setStyle(**opts)
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