/usr/lib/python2.7/dist-packages/pyqtgraph/graphicsItems/UIGraphicsItem.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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 | from ..Qt import QtGui, QtCore, USE_PYSIDE
import weakref
from .GraphicsObject import GraphicsObject
if not USE_PYSIDE:
import sip
__all__ = ['UIGraphicsItem']
class UIGraphicsItem(GraphicsObject):
"""
Base class for graphics items with boundaries relative to a GraphicsView or ViewBox.
The purpose of this class is to allow the creation of GraphicsItems which live inside
a scalable view, but whose boundaries will always stay fixed relative to the view's boundaries.
For example: GridItem, InfiniteLine
The view can be specified on initialization or it can be automatically detected when the item is painted.
NOTE: Only the item's boundingRect is affected; the item is not transformed in any way. Use viewRangeChanged
to respond to changes in the view.
"""
#sigViewChanged = QtCore.Signal(object) ## emitted whenever the viewport coords have changed
def __init__(self, bounds=None, parent=None):
"""
============== =============================================================================
**Arguments:**
bounds QRectF with coordinates relative to view box. The default is QRectF(0,0,1,1),
which means the item will have the same bounds as the view.
============== =============================================================================
"""
GraphicsObject.__init__(self, parent)
self.setFlag(self.ItemSendsScenePositionChanges)
if bounds is None:
self._bounds = QtCore.QRectF(0, 0, 1, 1)
else:
self._bounds = bounds
self._boundingRect = None
self._updateView()
def paint(self, *args):
## check for a new view object every time we paint.
#self.updateView()
pass
def itemChange(self, change, value):
ret = GraphicsObject.itemChange(self, change, value)
## workaround for pyqt bug:
## http://www.riverbankcomputing.com/pipermail/pyqt/2012-August/031818.html
if not USE_PYSIDE and change == self.ItemParentChange and isinstance(ret, QtGui.QGraphicsItem):
ret = sip.cast(ret, QtGui.QGraphicsItem)
if change == self.ItemScenePositionHasChanged:
self.setNewBounds()
return ret
#def updateView(self):
### called to see whether this item has a new view to connect to
### check for this item's current viewbox or view widget
#view = self.getViewBox()
#if view is None:
##print " no view"
#return
#if self._connectedView is not None and view is self._connectedView():
##print " already have view", view
#return
### disconnect from previous view
#if self._connectedView is not None:
#cv = self._connectedView()
#if cv is not None:
##print "disconnect:", self
#cv.sigRangeChanged.disconnect(self.viewRangeChanged)
### connect to new view
##print "connect:", self
#view.sigRangeChanged.connect(self.viewRangeChanged)
#self._connectedView = weakref.ref(view)
#self.setNewBounds()
def boundingRect(self):
if self._boundingRect is None:
br = self.viewRect()
if br is None:
return QtCore.QRectF()
else:
self._boundingRect = br
return QtCore.QRectF(self._boundingRect)
def dataBounds(self, axis, frac=1.0, orthoRange=None):
"""Called by ViewBox for determining the auto-range bounds.
By default, UIGraphicsItems are excluded from autoRange."""
return None
def viewRangeChanged(self):
"""Called when the view widget/viewbox is resized/rescaled"""
self.setNewBounds()
self.update()
def setNewBounds(self):
"""Update the item's bounding rect to match the viewport"""
self._boundingRect = None ## invalidate bounding rect, regenerate later if needed.
self.prepareGeometryChange()
def setPos(self, *args):
GraphicsObject.setPos(self, *args)
self.setNewBounds()
def mouseShape(self):
"""Return the shape of this item after expanding by 2 pixels"""
shape = self.shape()
ds = self.mapToDevice(shape)
stroker = QtGui.QPainterPathStroker()
stroker.setWidh(2)
ds2 = stroker.createStroke(ds).united(ds)
return self.mapFromDevice(ds2)
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