from pyqtgraph.Qt import QtGui, QtCore from UIGraphicsItem import UIGraphicsItem from InfiniteLine import InfiniteLine import pyqtgraph.functions as fn import pyqtgraph.debug as debug __all__ = ['LinearRegionItem'] class LinearRegionItem(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. """ 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): 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): 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): self.brush = fn.mkBrush(br) self.currentBrush = self.brush def setBounds(self, bounds): for l in self.lines: l.setBounds(bounds) def setMovable(self, m): 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): #prof = debug.Profiler('LinearRegionItem.paint') UIGraphicsItem.paint(self, p, *args) p.setBrush(self.currentBrush) p.drawRect(self.boundingRect()) #prof.finish() def dataBounds(self, axis, frac=1.0): 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 (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()