233 lines
7.7 KiB
Python
233 lines
7.7 KiB
Python
from pyqtgraph.Qt import QtGui, QtCore
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from UIGraphicsItem import UIGraphicsItem
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from InfiniteLine import InfiniteLine
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import pyqtgraph.functions as fn
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__all__ = ['LinearRegionItem']
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class LinearRegionItem(UIGraphicsItem):
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"""
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Used for marking a horizontal or vertical region in plots.
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The region can be dragged and is bounded by lines which can be dragged individually.
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"""
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sigRegionChangeFinished = QtCore.Signal(object)
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sigRegionChanged = QtCore.Signal(object)
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Vertical = 0
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Horizontal = 1
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def __init__(self, values=[0,1], orientation=None, brush=None, movable=True, bounds=None):
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UIGraphicsItem.__init__(self)
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if orientation is None:
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orientation = LinearRegionItem.Vertical
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self.orientation = orientation
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self.bounds = QtCore.QRectF()
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self.blockLineSignal = False
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self.moving = False
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if orientation == LinearRegionItem.Horizontal:
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self.lines = [
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InfiniteLine(QtCore.QPointF(0, values[0]), 0, movable=movable, bounds=bounds),
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InfiniteLine(QtCore.QPointF(0, values[1]), 0, movable=movable, bounds=bounds)]
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elif orientation == LinearRegionItem.Vertical:
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self.lines = [
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InfiniteLine(QtCore.QPointF(values[1], 0), 90, movable=movable, bounds=bounds),
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InfiniteLine(QtCore.QPointF(values[0], 0), 90, movable=movable, bounds=bounds)]
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else:
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raise Exception('Orientation must be one of LinearRegionItem.Vertical or LinearRegionItem.Horizontal')
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for l in self.lines:
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l.setParentItem(self)
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l.sigPositionChangeFinished.connect(self.lineMoveFinished)
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l.sigPositionChanged.connect(self.lineMoved)
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if brush is None:
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brush = QtGui.QBrush(QtGui.QColor(0, 0, 255, 50))
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self.setBrush(brush)
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self.setMovable(movable)
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def getRegion(self):
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"""Return the values at the edges of the region."""
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#if self.orientation[0] == 'h':
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#r = (self.bounds.top(), self.bounds.bottom())
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#else:
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#r = (self.bounds.left(), self.bounds.right())
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r = [self.lines[0].value(), self.lines[1].value()]
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return (min(r), max(r))
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def setRegion(self, rgn):
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if self.lines[0].value() == rgn[0] and self.lines[1].value() == rgn[1]:
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return
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self.blockLineSignal = True
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self.lines[0].setValue(rgn[0])
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self.blockLineSignal = False
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self.lines[1].setValue(rgn[1])
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#self.blockLineSignal = False
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self.lineMoved()
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self.lineMoveFinished()
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def setBrush(self, br):
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self.brush = fn.mkBrush(br)
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self.currentBrush = self.brush
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def setBounds(self, bounds):
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for l in self.lines:
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l.setBounds(bounds)
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def setMovable(self, m):
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for l in self.lines:
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l.setMovable(m)
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self.movable = m
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self.setAcceptHoverEvents(m)
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def boundingRect(self):
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br = UIGraphicsItem.boundingRect(self)
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rng = self.getRegion()
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if self.orientation == LinearRegionItem.Vertical:
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br.setLeft(rng[0])
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br.setRight(rng[1])
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else:
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br.setTop(rng[0])
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br.setBottom(rng[1])
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return br.normalized()
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def paint(self, p, *args):
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UIGraphicsItem.paint(self, p, *args)
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p.setBrush(self.currentBrush)
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p.drawRect(self.boundingRect())
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def dataBounds(self, axis, frac=1.0):
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if axis == self.orientation:
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return self.getRegion()
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else:
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return None
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def lineMoved(self):
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if self.blockLineSignal:
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return
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self.prepareGeometryChange()
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#self.emit(QtCore.SIGNAL('regionChanged'), self)
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self.sigRegionChanged.emit(self)
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def lineMoveFinished(self):
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#self.emit(QtCore.SIGNAL('regionChangeFinished'), self)
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self.sigRegionChangeFinished.emit(self)
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#def updateBounds(self):
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#vb = self.view().viewRect()
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#vals = [self.lines[0].value(), self.lines[1].value()]
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#if self.orientation[0] == 'h':
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#vb.setTop(min(vals))
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#vb.setBottom(max(vals))
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#else:
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#vb.setLeft(min(vals))
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#vb.setRight(max(vals))
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#if vb != self.bounds:
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#self.bounds = vb
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#self.rect.setRect(vb)
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#def mousePressEvent(self, ev):
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#if not self.movable:
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#ev.ignore()
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#return
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#for l in self.lines:
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#l.mousePressEvent(ev) ## pass event to both lines so they move together
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##if self.movable and ev.button() == QtCore.Qt.LeftButton:
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##ev.accept()
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##self.pressDelta = self.mapToParent(ev.pos()) - QtCore.QPointF(*self.p)
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##else:
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##ev.ignore()
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#def mouseReleaseEvent(self, ev):
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#for l in self.lines:
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#l.mouseReleaseEvent(ev)
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#def mouseMoveEvent(self, ev):
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##print "move", ev.pos()
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#if not self.movable:
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#return
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#self.lines[0].blockSignals(True) # only want to update once
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#for l in self.lines:
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#l.mouseMoveEvent(ev)
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#self.lines[0].blockSignals(False)
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##self.setPos(self.mapToParent(ev.pos()) - self.pressDelta)
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##self.emit(QtCore.SIGNAL('dragged'), self)
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def mouseDragEvent(self, ev):
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if not self.movable or int(ev.button() & QtCore.Qt.LeftButton) == 0:
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return
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ev.accept()
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if ev.isStart():
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bdp = ev.buttonDownPos()
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self.cursorOffsets = [l.pos() - bdp for l in self.lines]
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self.startPositions = [l.pos() for l in self.lines]
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self.moving = True
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if not self.moving:
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return
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#delta = ev.pos() - ev.lastPos()
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self.lines[0].blockSignals(True) # only want to update once
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for i, l in enumerate(self.lines):
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l.setPos(self.cursorOffsets[i] + ev.pos())
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#l.setPos(l.pos()+delta)
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#l.mouseDragEvent(ev)
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self.lines[0].blockSignals(False)
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self.prepareGeometryChange()
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if ev.isFinish():
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self.moving = False
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self.sigRegionChangeFinished.emit(self)
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else:
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self.sigRegionChanged.emit(self)
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def mouseClickEvent(self, ev):
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if self.moving and ev.button() == QtCore.Qt.RightButton:
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ev.accept()
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for i, l in enumerate(self.lines):
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l.setPos(self.startPositions[i])
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self.moving = False
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self.sigRegionChanged.emit(self)
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self.sigRegionChangeFinished.emit(self)
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def hoverEvent(self, ev):
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if (not ev.isExit()) and ev.acceptDrags(QtCore.Qt.LeftButton):
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c = self.brush.color()
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c.setAlpha(c.alpha() * 2)
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self.currentBrush = fn.mkBrush(c)
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else:
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self.currentBrush = self.brush
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self.update()
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#def hoverEnterEvent(self, ev):
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#print "rgn hover enter"
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#ev.ignore()
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#self.updateHoverBrush()
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#def hoverMoveEvent(self, ev):
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#print "rgn hover move"
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#ev.ignore()
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#self.updateHoverBrush()
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#def hoverLeaveEvent(self, ev):
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#print "rgn hover leave"
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#ev.ignore()
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#self.updateHoverBrush(False)
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#def updateHoverBrush(self, hover=None):
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#if hover is None:
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#scene = self.scene()
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#hover = scene.claimEvent(self, QtCore.Qt.LeftButton, scene.Drag)
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#if hover:
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#self.currentBrush = fn.mkBrush(255, 0,0,100)
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#else:
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#self.currentBrush = self.brush
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#self.update()
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