/usr/lib/python2.7/dist-packages/pyqtgraph/graphicsItems/LinearRegionItem.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.
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from .UIGraphicsItem import UIGraphicsItem
from .InfiniteLine import InfiniteLine
from .. import functions as fn
from .. import debug as debug
__all__ = ['LinearRegionItem']
class LinearRegionItem(UIGraphicsItem):
"""
**Bases:** :class:`UIGraphicsItem <pyqtgraph.UIGraphicsItem>`
Used for marking a horizontal or vertical region in plots.
The region can be dragged and is bounded by lines which can be dragged individually.
=============================== =============================================================================
**Signals:**
sigRegionChangeFinished(self) Emitted when the user has finished dragging the region (or one of its lines)
and when the region is changed programatically.
sigRegionChanged(self) Emitted while the user is dragging the region (or one of its lines)
and when the region is changed programatically.
=============================== =============================================================================
"""
sigRegionChangeFinished = QtCore.Signal(object)
sigRegionChanged = QtCore.Signal(object)
Vertical = 0
Horizontal = 1
def __init__(self, values=[0,1], orientation=None, brush=None, movable=True, bounds=None):
"""Create a new LinearRegionItem.
============== =====================================================================
**Arguments:**
values A list of the positions of the lines in the region. These are not
limits; limits can be set by specifying bounds.
orientation Options are LinearRegionItem.Vertical or LinearRegionItem.Horizontal.
If not specified it will be vertical.
brush Defines the brush that fills the region. Can be any arguments that
are valid for :func:`mkBrush <pyqtgraph.mkBrush>`. Default is
transparent blue.
movable If True, the region and individual lines are movable by the user; if
False, they are static.
bounds Optional [min, max] bounding values for the region
============== =====================================================================
"""
UIGraphicsItem.__init__(self)
if orientation is None:
orientation = LinearRegionItem.Vertical
self.orientation = orientation
self.bounds = QtCore.QRectF()
self.blockLineSignal = False
self.moving = False
self.mouseHovering = False
if orientation == LinearRegionItem.Horizontal:
self.lines = [
InfiniteLine(QtCore.QPointF(0, values[0]), 0, movable=movable, bounds=bounds),
InfiniteLine(QtCore.QPointF(0, values[1]), 0, movable=movable, bounds=bounds)]
elif orientation == LinearRegionItem.Vertical:
self.lines = [
InfiniteLine(QtCore.QPointF(values[1], 0), 90, movable=movable, bounds=bounds),
InfiniteLine(QtCore.QPointF(values[0], 0), 90, movable=movable, bounds=bounds)]
else:
raise Exception('Orientation must be one of LinearRegionItem.Vertical or LinearRegionItem.Horizontal')
for l in self.lines:
l.setParentItem(self)
l.sigPositionChangeFinished.connect(self.lineMoveFinished)
l.sigPositionChanged.connect(self.lineMoved)
if brush is None:
brush = QtGui.QBrush(QtGui.QColor(0, 0, 255, 50))
self.setBrush(brush)
self.setMovable(movable)
def getRegion(self):
"""Return the values at the edges of the region."""
#if self.orientation[0] == 'h':
#r = (self.bounds.top(), self.bounds.bottom())
#else:
#r = (self.bounds.left(), self.bounds.right())
r = [self.lines[0].value(), self.lines[1].value()]
return (min(r), max(r))
def setRegion(self, rgn):
"""Set the values for the edges of the region.
============== ==============================================
**Arguments:**
rgn A list or tuple of the lower and upper values.
============== ==============================================
"""
if self.lines[0].value() == rgn[0] and self.lines[1].value() == rgn[1]:
return
self.blockLineSignal = True
self.lines[0].setValue(rgn[0])
self.blockLineSignal = False
self.lines[1].setValue(rgn[1])
#self.blockLineSignal = False
self.lineMoved()
self.lineMoveFinished()
def setBrush(self, *br, **kargs):
"""Set the brush that fills the region. Can have any arguments that are valid
for :func:`mkBrush <pyqtgraph.mkBrush>`.
"""
self.brush = fn.mkBrush(*br, **kargs)
self.currentBrush = self.brush
def setBounds(self, bounds):
"""Optional [min, max] bounding values for the region. To have no bounds on the
region use [None, None].
Does not affect the current position of the region unless it is outside the new bounds.
See :func:`setRegion <pyqtgraph.LinearRegionItem.setRegion>` to set the position
of the region."""
for l in self.lines:
l.setBounds(bounds)
def setMovable(self, m):
"""Set lines to be movable by the user, or not. If lines are movable, they will
also accept HoverEvents."""
for l in self.lines:
l.setMovable(m)
self.movable = m
self.setAcceptHoverEvents(m)
def boundingRect(self):
br = UIGraphicsItem.boundingRect(self)
rng = self.getRegion()
if self.orientation == LinearRegionItem.Vertical:
br.setLeft(rng[0])
br.setRight(rng[1])
else:
br.setTop(rng[0])
br.setBottom(rng[1])
return br.normalized()
def paint(self, p, *args):
profiler = debug.Profiler()
UIGraphicsItem.paint(self, p, *args)
p.setBrush(self.currentBrush)
p.setPen(fn.mkPen(None))
p.drawRect(self.boundingRect())
def dataBounds(self, axis, frac=1.0, orthoRange=None):
if axis == self.orientation:
return self.getRegion()
else:
return None
def lineMoved(self):
if self.blockLineSignal:
return
self.prepareGeometryChange()
#self.emit(QtCore.SIGNAL('regionChanged'), self)
self.sigRegionChanged.emit(self)
def lineMoveFinished(self):
#self.emit(QtCore.SIGNAL('regionChangeFinished'), self)
self.sigRegionChangeFinished.emit(self)
#def updateBounds(self):
#vb = self.view().viewRect()
#vals = [self.lines[0].value(), self.lines[1].value()]
#if self.orientation[0] == 'h':
#vb.setTop(min(vals))
#vb.setBottom(max(vals))
#else:
#vb.setLeft(min(vals))
#vb.setRight(max(vals))
#if vb != self.bounds:
#self.bounds = vb
#self.rect.setRect(vb)
#def mousePressEvent(self, ev):
#if not self.movable:
#ev.ignore()
#return
#for l in self.lines:
#l.mousePressEvent(ev) ## pass event to both lines so they move together
##if self.movable and ev.button() == QtCore.Qt.LeftButton:
##ev.accept()
##self.pressDelta = self.mapToParent(ev.pos()) - QtCore.QPointF(*self.p)
##else:
##ev.ignore()
#def mouseReleaseEvent(self, ev):
#for l in self.lines:
#l.mouseReleaseEvent(ev)
#def mouseMoveEvent(self, ev):
##print "move", ev.pos()
#if not self.movable:
#return
#self.lines[0].blockSignals(True) # only want to update once
#for l in self.lines:
#l.mouseMoveEvent(ev)
#self.lines[0].blockSignals(False)
##self.setPos(self.mapToParent(ev.pos()) - self.pressDelta)
##self.emit(QtCore.SIGNAL('dragged'), self)
def mouseDragEvent(self, ev):
if not self.movable or int(ev.button() & QtCore.Qt.LeftButton) == 0:
return
ev.accept()
if ev.isStart():
bdp = ev.buttonDownPos()
self.cursorOffsets = [l.pos() - bdp for l in self.lines]
self.startPositions = [l.pos() for l in self.lines]
self.moving = True
if not self.moving:
return
#delta = ev.pos() - ev.lastPos()
self.lines[0].blockSignals(True) # only want to update once
for i, l in enumerate(self.lines):
l.setPos(self.cursorOffsets[i] + ev.pos())
#l.setPos(l.pos()+delta)
#l.mouseDragEvent(ev)
self.lines[0].blockSignals(False)
self.prepareGeometryChange()
if ev.isFinish():
self.moving = False
self.sigRegionChangeFinished.emit(self)
else:
self.sigRegionChanged.emit(self)
def mouseClickEvent(self, ev):
if self.moving and ev.button() == QtCore.Qt.RightButton:
ev.accept()
for i, l in enumerate(self.lines):
l.setPos(self.startPositions[i])
self.moving = False
self.sigRegionChanged.emit(self)
self.sigRegionChangeFinished.emit(self)
def hoverEvent(self, ev):
if self.movable and (not ev.isExit()) and ev.acceptDrags(QtCore.Qt.LeftButton):
self.setMouseHover(True)
else:
self.setMouseHover(False)
def setMouseHover(self, hover):
## Inform the item that the mouse is(not) hovering over it
if self.mouseHovering == hover:
return
self.mouseHovering = hover
if hover:
c = self.brush.color()
c.setAlpha(c.alpha() * 2)
self.currentBrush = fn.mkBrush(c)
else:
self.currentBrush = self.brush
self.update()
#def hoverEnterEvent(self, ev):
#print "rgn hover enter"
#ev.ignore()
#self.updateHoverBrush()
#def hoverMoveEvent(self, ev):
#print "rgn hover move"
#ev.ignore()
#self.updateHoverBrush()
#def hoverLeaveEvent(self, ev):
#print "rgn hover leave"
#ev.ignore()
#self.updateHoverBrush(False)
#def updateHoverBrush(self, hover=None):
#if hover is None:
#scene = self.scene()
#hover = scene.claimEvent(self, QtCore.Qt.LeftButton, scene.Drag)
#if hover:
#self.currentBrush = fn.mkBrush(255, 0,0,100)
#else:
#self.currentBrush = self.brush
#self.update()
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