from pyqtgraph.Qt import QtGui, QtCore from pyqtgraph.python2_3 import sortList import numpy as np from pyqtgraph.Point import Point import pyqtgraph.functions as fn from .. ItemGroup import ItemGroup from .. GraphicsWidget import GraphicsWidget from pyqtgraph.GraphicsScene import GraphicsScene import pyqtgraph import weakref from copy import deepcopy __all__ = ['ViewBox'] class ChildGroup(ItemGroup): sigItemsChanged = QtCore.Signal() def itemChange(self, change, value): ret = ItemGroup.itemChange(self, change, value) if change == self.ItemChildAddedChange or change == self.ItemChildRemovedChange: self.sigItemsChanged.emit() return ret class ViewBox(GraphicsWidget): """ **Bases:** :class:`GraphicsWidget ` Box that allows internal scaling/panning of children by mouse drag. This class is usually created automatically as part of a :class:`PlotItem ` or :class:`Canvas ` or with :func:`GraphicsLayout.addViewBox() `. Features: - Scaling contents by mouse or auto-scale when contents change - View linking--multiple views display the same data ranges - Configurable by context menu - Item coordinate mapping methods Not really compatible with GraphicsView having the same functionality. """ sigYRangeChanged = QtCore.Signal(object, object) sigXRangeChanged = QtCore.Signal(object, object) sigRangeChangedManually = QtCore.Signal(object) sigRangeChanged = QtCore.Signal(object, object) #sigActionPositionChanged = QtCore.Signal(object) sigStateChanged = QtCore.Signal(object) sigTransformChanged = QtCore.Signal(object) ## mouse modes PanMode = 3 RectMode = 1 ## axes XAxis = 0 YAxis = 1 XYAxes = 2 ## for linking views together NamedViews = weakref.WeakValueDictionary() # name: ViewBox AllViews = weakref.WeakKeyDictionary() # ViewBox: None def __init__(self, parent=None, border=None, lockAspect=False, enableMouse=True, invertY=False, enableMenu=True, name=None): """ ============= ============================================================= **Arguments** *parent* (QGraphicsWidget) Optional parent widget *border* (QPen) Do draw a border around the view, give any single argument accepted by :func:`mkPen ` *lockAspect* (False or float) The aspect ratio to lock the view coorinates to. (or False to allow the ratio to change) *enableMouse* (bool) Whether mouse can be used to scale/pan the view *invertY* (bool) See :func:`invertY ` ============= ============================================================= """ GraphicsWidget.__init__(self, parent) self.name = None self.linksBlocked = False self.addedItems = [] #self.gView = view #self.showGrid = showGrid self.state = { ## separating targetRange and viewRange allows the view to be resized ## while keeping all previously viewed contents visible 'targetRange': [[0,1], [0,1]], ## child coord. range visible [[xmin, xmax], [ymin, ymax]] 'viewRange': [[0,1], [0,1]], ## actual range viewed 'yInverted': invertY, 'aspectLocked': False, ## False if aspect is unlocked, otherwise float specifies the locked ratio. 'autoRange': [True, True], ## False if auto range is disabled, ## otherwise float gives the fraction of data that is visible 'autoPan': [False, False], ## whether to only pan (do not change scaling) when auto-range is enabled 'autoVisibleOnly': [False, False], ## whether to auto-range only to the visible portion of a plot 'linkedViews': [None, None], ## may be None, "viewName", or weakref.ref(view) ## a name string indicates that the view *should* link to another, but no view with that name exists yet. 'mouseEnabled': [enableMouse, enableMouse], 'mouseMode': ViewBox.PanMode if pyqtgraph.getConfigOption('leftButtonPan') else ViewBox.RectMode, 'enableMenu': enableMenu, 'wheelScaleFactor': -1.0 / 8.0, 'background': None, } self._updatingRange = False ## Used to break recursive loops. See updateAutoRange. self.setFlag(self.ItemClipsChildrenToShape) self.setFlag(self.ItemIsFocusable, True) ## so we can receive key presses ## childGroup is required so that ViewBox has local coordinates similar to device coordinates. ## this is a workaround for a Qt + OpenGL bug that causes improper clipping ## https://bugreports.qt.nokia.com/browse/QTBUG-23723 self.childGroup = ChildGroup(self) self.childGroup.sigItemsChanged.connect(self.itemsChanged) self.background = QtGui.QGraphicsRectItem(self.rect()) self.background.setParentItem(self) self.background.setZValue(-1e6) self.background.setPen(fn.mkPen(None)) self.updateBackground() #self.useLeftButtonPan = pyqtgraph.getConfigOption('leftButtonPan') # normally use left button to pan # this also enables capture of keyPressEvents. ## Make scale box that is shown when dragging on the view self.rbScaleBox = QtGui.QGraphicsRectItem(0, 0, 1, 1) self.rbScaleBox.setPen(fn.mkPen((255,255,100), width=1)) self.rbScaleBox.setBrush(fn.mkBrush(255,255,0,100)) self.rbScaleBox.hide() self.addItem(self.rbScaleBox) self.axHistory = [] # maintain a history of zoom locations self.axHistoryPointer = -1 # pointer into the history. Allows forward/backward movement, not just "undo" self.setZValue(-100) self.setSizePolicy(QtGui.QSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding)) self.setAspectLocked(lockAspect) self.border = fn.mkPen(border) self.menu = ViewBoxMenu(self) self.register(name) if name is None: self.updateViewLists() def register(self, name): """ Add this ViewBox to the registered list of views. *name* will appear in the drop-down lists for axis linking in all other views. The same can be accomplished by initializing the ViewBox with the *name* attribute. """ ViewBox.AllViews[self] = None if self.name is not None: del ViewBox.NamedViews[self.name] self.name = name if name is not None: ViewBox.NamedViews[name] = self ViewBox.updateAllViewLists() sid = id(self) self.destroyed.connect(lambda: ViewBox.forgetView(sid, name) if (ViewBox is not None and 'sid' in locals() and 'name' in locals()) else None) #self.destroyed.connect(self.unregister) def unregister(self): """ Remove this ViewBox forom the list of linkable views. (see :func:`register() `) """ del ViewBox.AllViews[self] if self.name is not None: del ViewBox.NamedViews[self.name] def close(self): self.unregister() def implements(self, interface): return interface == 'ViewBox' def getState(self, copy=True): """Return the current state of the ViewBox. Linked views are always converted to view names in the returned state.""" state = self.state.copy() views = [] for v in state['linkedViews']: if isinstance(v, weakref.ref): v = v() if v is None or isinstance(v, basestring): views.append(v) else: views.append(v.name) state['linkedViews'] = views if copy: return deepcopy(state) else: return state def setState(self, state): """Restore the state of this ViewBox. (see also getState)""" state = state.copy() self.setXLink(state['linkedViews'][0]) self.setYLink(state['linkedViews'][1]) del state['linkedViews'] self.state.update(state) self.updateMatrix() self.sigStateChanged.emit(self) def setMouseMode(self, mode): """ Set the mouse interaction mode. *mode* must be either ViewBox.PanMode or ViewBox.RectMode. In PanMode, the left mouse button pans the view and the right button scales. In RectMode, the left button draws a rectangle which updates the visible region (this mode is more suitable for single-button mice) """ if mode not in [ViewBox.PanMode, ViewBox.RectMode]: raise Exception("Mode must be ViewBox.PanMode or ViewBox.RectMode") self.state['mouseMode'] = mode self.sigStateChanged.emit(self) #def toggleLeftAction(self, act): ## for backward compatibility #if act.text() is 'pan': #self.setLeftButtonAction('pan') #elif act.text() is 'zoom': #self.setLeftButtonAction('rect') def setLeftButtonAction(self, mode='rect'): ## for backward compatibility if mode.lower() == 'rect': self.setMouseMode(ViewBox.RectMode) elif mode.lower() == 'pan': self.setMouseMode(ViewBox.PanMode) else: raise Exception('graphicsItems:ViewBox:setLeftButtonAction: unknown mode = %s (Options are "pan" and "rect")' % mode) def innerSceneItem(self): return self.childGroup def setMouseEnabled(self, x=None, y=None): """ Set whether each axis is enabled for mouse interaction. *x*, *y* arguments must be True or False. This allows the user to pan/scale one axis of the view while leaving the other axis unchanged. """ if x is not None: self.state['mouseEnabled'][0] = x if y is not None: self.state['mouseEnabled'][1] = y self.sigStateChanged.emit(self) def mouseEnabled(self): return self.state['mouseEnabled'][:] def setMenuEnabled(self, enableMenu=True): self.state['enableMenu'] = enableMenu self.sigStateChanged.emit(self) def menuEnabled(self): return self.state.get('enableMenu', True) def addItem(self, item, ignoreBounds=False): """ Add a QGraphicsItem to this view. The view will include this item when determining how to set its range automatically unless *ignoreBounds* is True. """ if item.zValue() < self.zValue(): item.setZValue(self.zValue()+1) item.setParentItem(self.childGroup) if not ignoreBounds: self.addedItems.append(item) self.updateAutoRange() #print "addItem:", item, item.boundingRect() def removeItem(self, item): """Remove an item from this view.""" try: self.addedItems.remove(item) except: pass self.scene().removeItem(item) self.updateAutoRange() def resizeEvent(self, ev): #self.setRange(self.range, padding=0) #self.updateAutoRange() self.updateMatrix() self.sigStateChanged.emit(self) self.background.setRect(self.rect()) #self.linkedXChanged() #self.linkedYChanged() def viewRange(self): """Return a the view's visible range as a list: [[xmin, xmax], [ymin, ymax]]""" return [x[:] for x in self.state['viewRange']] ## return copy def viewRect(self): """Return a QRectF bounding the region visible within the ViewBox""" try: vr0 = self.state['viewRange'][0] vr1 = self.state['viewRange'][1] return QtCore.QRectF(vr0[0], vr1[0], vr0[1]-vr0[0], vr1[1] - vr1[0]) except: print("make qrectf failed:", self.state['viewRange']) raise def targetRange(self): return [x[:] for x in self.state['targetRange']] ## return copy def targetRect(self): """ Return the region which has been requested to be visible. (this is not necessarily the same as the region that is *actually* visible-- resizing and aspect ratio constraints can cause targetRect() and viewRect() to differ) """ try: tr0 = self.state['targetRange'][0] tr1 = self.state['targetRange'][1] return QtCore.QRectF(tr0[0], tr1[0], tr0[1]-tr0[0], tr1[1] - tr1[0]) except: print("make qrectf failed:", self.state['targetRange']) raise def setRange(self, rect=None, xRange=None, yRange=None, padding=0.02, update=True, disableAutoRange=True): """ Set the visible range of the ViewBox. Must specify at least one of *range*, *xRange*, or *yRange*. ============= ===================================================================== **Arguments** *rect* (QRectF) The full range that should be visible in the view box. *xRange* (min,max) The range that should be visible along the x-axis. *yRange* (min,max) The range that should be visible along the y-axis. *padding* (float) Expand the view by a fraction of the requested range. By default, this value is 0.02 (2%) ============= ===================================================================== """ changes = {} if rect is not None: changes = {0: [rect.left(), rect.right()], 1: [rect.top(), rect.bottom()]} if xRange is not None: changes[0] = xRange if yRange is not None: changes[1] = yRange if len(changes) == 0: print(rect) raise Exception("Must specify at least one of rect, xRange, or yRange. (gave rect=%s)" % str(type(rect))) changed = [False, False] for ax, range in changes.items(): mn = min(range) mx = max(range) if mn == mx: ## If we requested 0 range, try to preserve previous scale. Otherwise just pick an arbitrary scale. dy = self.state['viewRange'][ax][1] - self.state['viewRange'][ax][0] if dy == 0: dy = 1 mn -= dy*0.5 mx += dy*0.5 padding = 0.0 if any(np.isnan([mn, mx])) or any(np.isinf([mn, mx])): raise Exception("Not setting range [%s, %s]" % (str(mn), str(mx))) p = (mx-mn) * padding mn -= p mx += p if self.state['targetRange'][ax] != [mn, mx]: self.state['targetRange'][ax] = [mn, mx] changed[ax] = True if any(changed) and disableAutoRange: if all(changed): ax = ViewBox.XYAxes elif changed[0]: ax = ViewBox.XAxis elif changed[1]: ax = ViewBox.YAxis self.enableAutoRange(ax, False) self.sigStateChanged.emit(self) if update: self.updateMatrix(changed) for ax, range in changes.items(): link = self.linkedView(ax) if link is not None: link.linkedViewChanged(self, ax) if changed[0] and self.state['autoVisibleOnly'][1]: self.updateAutoRange() elif changed[1] and self.state['autoVisibleOnly'][0]: self.updateAutoRange() def setYRange(self, min, max, padding=0.02, update=True): """ Set the visible Y range of the view to [*min*, *max*]. The *padding* argument causes the range to be set larger by the fraction specified. """ self.setRange(yRange=[min, max], update=update, padding=padding) def setXRange(self, min, max, padding=0.02, update=True): """ Set the visible X range of the view to [*min*, *max*]. The *padding* argument causes the range to be set larger by the fraction specified. """ self.setRange(xRange=[min, max], update=update, padding=padding) def autoRange(self, padding=0.02, item=None): """ Set the range of the view box to make all children visible. Note that this is not the same as enableAutoRange, which causes the view to automatically auto-range whenever its contents are changed. """ if item is None: bounds = self.childrenBoundingRect() else: bounds = self.mapFromItemToView(item, item.boundingRect()).boundingRect() if bounds is not None: self.setRange(bounds, padding=padding) def scaleBy(self, s, center=None): """ Scale by *s* around given center point (or center of view). *s* may be a Point or tuple (x, y) """ scale = Point(s) if self.state['aspectLocked'] is not False: scale[0] = self.state['aspectLocked'] * scale[1] vr = self.targetRect() if center is None: center = Point(vr.center()) else: center = Point(center) tl = center + (vr.topLeft()-center) * scale br = center + (vr.bottomRight()-center) * scale self.setRange(QtCore.QRectF(tl, br), padding=0) def translateBy(self, t): """ Translate the view by *t*, which may be a Point or tuple (x, y). """ t = Point(t) #if viewCoords: ## scale from pixels #o = self.mapToView(Point(0,0)) #t = self.mapToView(t) - o vr = self.targetRect() self.setRange(vr.translated(t), padding=0) def enableAutoRange(self, axis=None, enable=True): """ Enable (or disable) auto-range for *axis*, which may be ViewBox.XAxis, ViewBox.YAxis, or ViewBox.XYAxes for both (if *axis* is omitted, both axes will be changed). When enabled, the axis will automatically rescale when items are added/removed or change their shape. The argument *enable* may optionally be a float (0.0-1.0) which indicates the fraction of the data that should be visible (this only works with items implementing a dataRange method, such as PlotDataItem). """ #print "autorange:", axis, enable #if not enable: #import traceback #traceback.print_stack() if enable is True: enable = 1.0 if axis is None: axis = ViewBox.XYAxes if axis == ViewBox.XYAxes or axis == 'xy': self.state['autoRange'][0] = enable self.state['autoRange'][1] = enable elif axis == ViewBox.XAxis or axis == 'x': self.state['autoRange'][0] = enable elif axis == ViewBox.YAxis or axis == 'y': self.state['autoRange'][1] = enable else: raise Exception('axis argument must be ViewBox.XAxis, ViewBox.YAxis, or ViewBox.XYAxes.') if enable: self.updateAutoRange() self.sigStateChanged.emit(self) def disableAutoRange(self, axis=None): """Disables auto-range. (See enableAutoRange)""" self.enableAutoRange(axis, enable=False) def autoRangeEnabled(self): return self.state['autoRange'][:] def setAutoPan(self, x=None, y=None): if x is not None: self.state['autoPan'][0] = x if y is not None: self.state['autoPan'][1] = y if None not in [x,y]: self.updateAutoRange() def setAutoVisible(self, x=None, y=None): if x is not None: self.state['autoVisibleOnly'][0] = x if x is True: self.state['autoVisibleOnly'][1] = False if y is not None: self.state['autoVisibleOnly'][1] = y if y is True: self.state['autoVisibleOnly'][0] = False if x is not None or y is not None: self.updateAutoRange() def updateAutoRange(self): ## Break recursive loops when auto-ranging. ## This is needed because some items change their size in response ## to a view change. if self._updatingRange: return self._updatingRange = True try: targetRect = self.viewRange() if not any(self.state['autoRange']): return fractionVisible = self.state['autoRange'][:] for i in [0,1]: if type(fractionVisible[i]) is bool: fractionVisible[i] = 1.0 childRange = None order = [0,1] if self.state['autoVisibleOnly'][0] is True: order = [1,0] args = {} for ax in order: if self.state['autoRange'][ax] is False: continue if self.state['autoVisibleOnly'][ax]: oRange = [None, None] oRange[ax] = targetRect[1-ax] childRange = self.childrenBounds(frac=fractionVisible, orthoRange=oRange) else: if childRange is None: childRange = self.childrenBounds(frac=fractionVisible) ## Make corrections to range xr = childRange[ax] if xr is not None: if self.state['autoPan'][ax]: x = sum(xr) * 0.5 #x = childRect.center().x() w2 = (targetRect[ax][1]-targetRect[ax][0]) / 2. #childRect.setLeft(x-w2) #childRect.setRight(x+w2) childRange[ax] = [x-w2, x+w2] else: #wp = childRect.width() * 0.02 wp = (xr[1] - xr[0]) * 0.02 #childRect = childRect.adjusted(-wp, 0, wp, 0) childRange[ax][0] -= wp childRange[ax][1] += wp #targetRect[ax][0] = childRect.left() #targetRect[ax][1] = childRect.right() targetRect[ax] = childRange[ax] args['xRange' if ax == 0 else 'yRange'] = targetRect[ax] #else: ### Make corrections to Y range #if self.state['autoPan'][1]: #y = childRect.center().y() #h2 = (targetRect[1][1]-targetRect[1][0]) / 2. #childRect.setTop(y-h2) #childRect.setBottom(y+h2) #else: #hp = childRect.height() * 0.02 #childRect = childRect.adjusted(0, -hp, 0, hp) #targetRect[1][0] = childRect.top() #targetRect[1][1] = childRect.bottom() #args['yRange'] = targetRect[1] if len(args) == 0: return args['padding'] = 0 args['disableAutoRange'] = False #self.setRange(xRange=targetRect[0], yRange=targetRect[1], padding=0, disableAutoRange=False) self.setRange(**args) finally: self._updatingRange = False def setXLink(self, view): """Link this view's X axis to another view. (see LinkView)""" self.linkView(self.XAxis, view) def setYLink(self, view): """Link this view's Y axis to another view. (see LinkView)""" self.linkView(self.YAxis, view) def linkView(self, axis, view): """ Link X or Y axes of two views and unlink any previously connected axes. *axis* must be ViewBox.XAxis or ViewBox.YAxis. If view is None, the axis is left unlinked. """ if isinstance(view, basestring): if view == '': view = None else: view = ViewBox.NamedViews.get(view, view) ## convert view name to ViewBox if possible if hasattr(view, 'implements') and view.implements('ViewBoxWrapper'): view = view.getViewBox() ## used to connect/disconnect signals between a pair of views if axis == ViewBox.XAxis: signal = 'sigXRangeChanged' slot = self.linkedXChanged else: signal = 'sigYRangeChanged' slot = self.linkedYChanged oldLink = self.linkedView(axis) if oldLink is not None: try: getattr(oldLink, signal).disconnect(slot) except TypeError: ## This can occur if the view has been deleted already pass if view is None or isinstance(view, basestring): self.state['linkedViews'][axis] = view else: self.state['linkedViews'][axis] = weakref.ref(view) getattr(view, signal).connect(slot) if view.autoRangeEnabled()[axis] is not False: self.enableAutoRange(axis, False) slot() else: if self.autoRangeEnabled()[axis] is False: slot() self.sigStateChanged.emit(self) def blockLink(self, b): self.linksBlocked = b ## prevents recursive plot-change propagation def linkedXChanged(self): ## called when x range of linked view has changed view = self.linkedView(0) self.linkedViewChanged(view, ViewBox.XAxis) def linkedYChanged(self): ## called when y range of linked view has changed view = self.linkedView(1) self.linkedViewChanged(view, ViewBox.YAxis) def linkedView(self, ax): ## Return the linked view for axis *ax*. ## this method _always_ returns either a ViewBox or None. v = self.state['linkedViews'][ax] if v is None or isinstance(v, basestring): return None else: return v() ## dereference weakref pointer. If the reference is dead, this returns None def linkedViewChanged(self, view, axis): if self.linksBlocked or view is None: return vr = view.viewRect() vg = view.screenGeometry() sg = self.screenGeometry() if vg is None or sg is None: return view.blockLink(True) try: if axis == ViewBox.XAxis: overlap = min(sg.right(), vg.right()) - max(sg.left(), vg.left()) if overlap < min(vg.width()/3, sg.width()/3): ## if less than 1/3 of views overlap, ## then just replicate the view x1 = vr.left() x2 = vr.right() else: ## views overlap; line them up upp = float(vr.width()) / vg.width() x1 = vr.left() + (sg.x()-vg.x()) * upp x2 = x1 + sg.width() * upp self.enableAutoRange(ViewBox.XAxis, False) self.setXRange(x1, x2, padding=0) else: overlap = min(sg.bottom(), vg.bottom()) - max(sg.top(), vg.top()) if overlap < min(vg.height()/3, sg.height()/3): ## if less than 1/3 of views overlap, ## then just replicate the view y1 = vr.top() y2 = vr.bottom() else: ## views overlap; line them up upp = float(vr.height()) / vg.height() y2 = vr.bottom() - (sg.y()-vg.y()) * upp y1 = y2 - sg.height() * upp self.enableAutoRange(ViewBox.YAxis, False) self.setYRange(y1, y2, padding=0) finally: view.blockLink(False) def screenGeometry(self): """return the screen geometry of the viewbox""" v = self.getViewWidget() if v is None: return None b = self.sceneBoundingRect() wr = v.mapFromScene(b).boundingRect() pos = v.mapToGlobal(v.pos()) wr.adjust(pos.x(), pos.y(), pos.x(), pos.y()) return wr def itemsChanged(self): ## called when items are added/removed from self.childGroup self.updateAutoRange() def itemBoundsChanged(self, item): self.updateAutoRange() def invertY(self, b=True): """ By default, the positive y-axis points upward on the screen. Use invertY(True) to reverse the y-axis. """ self.state['yInverted'] = b self.updateMatrix(changed=(False, True)) self.sigStateChanged.emit(self) def yInverted(self): return self.state['yInverted'] def setAspectLocked(self, lock=True, ratio=1): """ If the aspect ratio is locked, view scaling must always preserve the aspect ratio. By default, the ratio is set to 1; x and y both have the same scaling. This ratio can be overridden (width/height), or use None to lock in the current ratio. """ if not lock: self.state['aspectLocked'] = False else: vr = self.viewRect() currentRatio = vr.width() / vr.height() if ratio is None: ratio = currentRatio self.state['aspectLocked'] = ratio if ratio != currentRatio: ## If this would change the current range, do that now #self.setRange(0, self.state['viewRange'][0][0], self.state['viewRange'][0][1]) self.updateMatrix() self.sigStateChanged.emit(self) def childTransform(self): """ Return the transform that maps from child(item in the childGroup) coordinates to local coordinates. (This maps from inside the viewbox to outside) """ m = self.childGroup.transform() #m1 = QtGui.QTransform() #m1.translate(self.childGroup.pos().x(), self.childGroup.pos().y()) return m #*m1 def mapToView(self, obj): """Maps from the local coordinates of the ViewBox to the coordinate system displayed inside the ViewBox""" m = fn.invertQTransform(self.childTransform()) return m.map(obj) def mapFromView(self, obj): """Maps from the coordinate system displayed inside the ViewBox to the local coordinates of the ViewBox""" m = self.childTransform() return m.map(obj) def mapSceneToView(self, obj): """Maps from scene coordinates to the coordinate system displayed inside the ViewBox""" return self.mapToView(self.mapFromScene(obj)) def mapViewToScene(self, obj): """Maps from the coordinate system displayed inside the ViewBox to scene coordinates""" return self.mapToScene(self.mapFromView(obj)) def mapFromItemToView(self, item, obj): """Maps *obj* from the local coordinate system of *item* to the view coordinates""" return self.childGroup.mapFromItem(item, obj) #return self.mapSceneToView(item.mapToScene(obj)) def mapFromViewToItem(self, item, obj): """Maps *obj* from view coordinates to the local coordinate system of *item*.""" return self.childGroup.mapToItem(item, obj) #return item.mapFromScene(self.mapViewToScene(obj)) def mapViewToDevice(self, obj): return self.mapToDevice(self.mapFromView(obj)) def mapDeviceToView(self, obj): return self.mapToView(self.mapFromDevice(obj)) def viewPixelSize(self): """Return the (width, height) of a screen pixel in view coordinates.""" o = self.mapToView(Point(0,0)) px, py = [Point(self.mapToView(v) - o) for v in self.pixelVectors()] return (px.length(), py.length()) def itemBoundingRect(self, item): """Return the bounding rect of the item in view coordinates""" return self.mapSceneToView(item.sceneBoundingRect()).boundingRect() #def viewScale(self): #vr = self.viewRect() ##print "viewScale:", self.range #xd = vr.width() #yd = vr.height() #if xd == 0 or yd == 0: #print "Warning: 0 range in view:", xd, yd #return np.array([1,1]) ##cs = self.canvas().size() #cs = self.boundingRect() #scale = np.array([cs.width() / xd, cs.height() / yd]) ##print "view scale:", scale #return scale def wheelEvent(self, ev, axis=None): mask = np.array(self.state['mouseEnabled'], dtype=np.float) if axis is not None and axis >= 0 and axis < len(mask): mv = mask[axis] mask[:] = 0 mask[axis] = mv s = ((mask * 0.02) + 1) ** (ev.delta() * self.state['wheelScaleFactor']) # actual scaling factor center = Point(fn.invertQTransform(self.childGroup.transform()).map(ev.pos())) #center = ev.pos() self.scaleBy(s, center) self.sigRangeChangedManually.emit(self.state['mouseEnabled']) ev.accept() def mouseClickEvent(self, ev): if ev.button() == QtCore.Qt.RightButton and self.menuEnabled(): ev.accept() self.raiseContextMenu(ev) def raiseContextMenu(self, ev): #print "viewbox.raiseContextMenu called." #menu = self.getMenu(ev) menu = self.getMenu(ev) self.scene().addParentContextMenus(self, menu, ev) #print "2:", [str(a.text()) for a in self.menu.actions()] pos = ev.screenPos() #pos2 = ev.scenePos() #print "3:", [str(a.text()) for a in self.menu.actions()] #self.sigActionPositionChanged.emit(pos2) menu.popup(QtCore.QPoint(pos.x(), pos.y())) #print "4:", [str(a.text()) for a in self.menu.actions()] def getMenu(self, ev): self._menuCopy = self.menu.copy() ## temporary storage to prevent menu disappearing return self._menuCopy def getContextMenus(self, event): if self.menuEnabled(): return self.menu.subMenus() else: return None #return [self.getMenu(event)] def mouseDragEvent(self, ev, axis=None): ## if axis is specified, event will only affect that axis. ev.accept() ## we accept all buttons pos = ev.pos() lastPos = ev.lastPos() dif = pos - lastPos dif = dif * -1 ## Ignore axes if mouse is disabled mask = np.array(self.state['mouseEnabled'], dtype=np.float) if axis is not None: mask[1-axis] = 0.0 ## Scale or translate based on mouse button if ev.button() & (QtCore.Qt.LeftButton | QtCore.Qt.MidButton): if self.state['mouseMode'] == ViewBox.RectMode: if ev.isFinish(): ## This is the final move in the drag; change the view scale now #print "finish" self.rbScaleBox.hide() #ax = QtCore.QRectF(Point(self.pressPos), Point(self.mousePos)) ax = QtCore.QRectF(Point(ev.buttonDownPos(ev.button())), Point(pos)) ax = self.childGroup.mapRectFromParent(ax) self.showAxRect(ax) self.axHistoryPointer += 1 self.axHistory = self.axHistory[:self.axHistoryPointer] + [ax] else: ## update shape of scale box self.updateScaleBox(ev.buttonDownPos(), ev.pos()) else: tr = dif*mask tr = self.mapToView(tr) - self.mapToView(Point(0,0)) self.translateBy(tr) self.sigRangeChangedManually.emit(self.state['mouseEnabled']) elif ev.button() & QtCore.Qt.RightButton: #print "vb.rightDrag" if self.state['aspectLocked'] is not False: mask[0] = 0 dif = ev.screenPos() - ev.lastScreenPos() dif = np.array([dif.x(), dif.y()]) dif[0] *= -1 s = ((mask * 0.02) + 1) ** dif tr = self.childGroup.transform() tr = fn.invertQTransform(tr) center = Point(tr.map(ev.buttonDownPos(QtCore.Qt.RightButton))) self.scaleBy(s, center) self.sigRangeChangedManually.emit(self.state['mouseEnabled']) def keyPressEvent(self, ev): """ This routine should capture key presses in the current view box. Key presses are used only when mouse mode is RectMode The following events are implemented: ctrl-A : zooms out to the default "full" view of the plot ctrl-+ : moves forward in the zooming stack (if it exists) ctrl-- : moves backward in the zooming stack (if it exists) """ #print ev.key() #print 'I intercepted a key press, but did not accept it' ## not implemented yet ? #self.keypress.sigkeyPressEvent.emit() ev.accept() if ev.text() == '-': self.scaleHistory(-1) elif ev.text() in ['+', '=']: self.scaleHistory(1) elif ev.key() == QtCore.Qt.Key_Backspace: self.scaleHistory(len(self.axHistory)) else: ev.ignore() def scaleHistory(self, d): ptr = max(0, min(len(self.axHistory)-1, self.axHistoryPointer+d)) if ptr != self.axHistoryPointer: self.axHistoryPointer = ptr self.showAxRect(self.axHistory[ptr]) def updateScaleBox(self, p1, p2): r = QtCore.QRectF(p1, p2) r = self.childGroup.mapRectFromParent(r) self.rbScaleBox.setPos(r.topLeft()) self.rbScaleBox.resetTransform() self.rbScaleBox.scale(r.width(), r.height()) self.rbScaleBox.show() def showAxRect(self, ax): self.setRange(ax.normalized()) # be sure w, h are correct coordinates self.sigRangeChangedManually.emit(self.state['mouseEnabled']) #def mouseRect(self): #vs = self.viewScale() #vr = self.state['viewRange'] ## Convert positions from screen (view) pixel coordinates to axis coordinates #ax = QtCore.QRectF(self.pressPos[0]/vs[0]+vr[0][0], -(self.pressPos[1]/vs[1]-vr[1][1]), #(self.mousePos[0]-self.pressPos[0])/vs[0], -(self.mousePos[1]-self.pressPos[1])/vs[1]) #return(ax) def allChildren(self, item=None): """Return a list of all children and grandchildren of this ViewBox""" if item is None: item = self.childGroup children = [item] for ch in item.childItems(): children.extend(self.allChildren(ch)) return children def childrenBounds(self, frac=None, orthoRange=(None,None)): """Return the bounding range of all children. [[xmin, xmax], [ymin, ymax]] Values may be None if there are no specific bounds for an axis. """ #items = self.allChildren() items = self.addedItems #if item is None: ##print "children bounding rect:" #item = self.childGroup range = [None, None] for item in items: if not item.isVisible(): continue #print "=========", item useX = True useY = True if hasattr(item, 'dataBounds'): if frac is None: frac = (1.0, 1.0) xr = item.dataBounds(0, frac=frac[0], orthoRange=orthoRange[0]) yr = item.dataBounds(1, frac=frac[1], orthoRange=orthoRange[1]) #print " xr:", xr, " yr:", yr if xr is None or xr == (None, None): useX = False xr = (0,0) if yr is None or yr == (None, None): useY = False yr = (0,0) bounds = QtCore.QRectF(xr[0], yr[0], xr[1]-xr[0], yr[1]-yr[0]) #print " xr:", xr, " yr:", yr #print " item real:", bounds else: if int(item.flags() & item.ItemHasNoContents) > 0: continue #print " empty" else: bounds = item.boundingRect() #bounds = [[item.left(), item.top()], [item.right(), item.bottom()]] #print " item:", bounds #bounds = QtCore.QRectF(bounds[0][0], bounds[1][0], bounds[0][1]-bounds[0][0], bounds[1][1]-bounds[1][0]) bounds = self.mapFromItemToView(item, bounds).boundingRect() #print " ", bounds #print " useX:", useX, " useY:", useY if not any([useX, useY]): continue if useX != useY: ## != means xor ang = item.transformAngle() if ang == 0 or ang == 180: pass elif ang == 90 or ang == 270: useX, useY = useY, useX else: continue ## need to check for item rotations and decide how best to apply this boundary. #print " useX:", useX, " useY:", useY #print " range:", range #print " bounds (r,l,t,b):", bounds.right(), bounds.left(), bounds.top(), bounds.bottom() if useY: if range[1] is not None: range[1] = [min(bounds.top(), range[1][0]), max(bounds.bottom(), range[1][1])] else: range[1] = [bounds.top(), bounds.bottom()] if useX: if range[0] is not None: range[0] = [min(bounds.left(), range[0][0]), max(bounds.right(), range[0][1])] else: range[0] = [bounds.left(), bounds.right()] #print " range:", range return range def childrenBoundingRect(self, *args, **kwds): range = self.childrenBounds(*args, **kwds) tr = self.targetRange() if range[0] is None: range[0] = tr[0] if range[1] is None: range[1] = tr[1] bounds = QtCore.QRectF(range[0][0], range[1][0], range[0][1]-range[0][0], range[1][1]-range[1][0]) return bounds def updateMatrix(self, changed=None): if changed is None: changed = [False, False] changed = list(changed) #print "udpateMatrix:" #print " range:", self.range tr = self.targetRect() bounds = self.rect() #boundingRect() #print bounds ## set viewRect, given targetRect and possibly aspect ratio constraint if self.state['aspectLocked'] is False or bounds.height() == 0: self.state['viewRange'] = [self.state['targetRange'][0][:], self.state['targetRange'][1][:]] else: viewRatio = bounds.width() / bounds.height() targetRatio = self.state['aspectLocked'] * tr.width() / tr.height() if targetRatio > viewRatio: ## target is wider than view dy = 0.5 * (tr.width() / (self.state['aspectLocked'] * viewRatio) - tr.height()) if dy != 0: changed[1] = True self.state['viewRange'] = [self.state['targetRange'][0][:], [self.state['targetRange'][1][0] - dy, self.state['targetRange'][1][1] + dy]] else: dx = 0.5 * (tr.height() * viewRatio * self.state['aspectLocked'] - tr.width()) if dx != 0: changed[0] = True self.state['viewRange'] = [[self.state['targetRange'][0][0] - dx, self.state['targetRange'][0][1] + dx], self.state['targetRange'][1][:]] vr = self.viewRect() #print " bounds:", bounds if vr.height() == 0 or vr.width() == 0: return scale = Point(bounds.width()/vr.width(), bounds.height()/vr.height()) if not self.state['yInverted']: scale = scale * Point(1, -1) m = QtGui.QTransform() ## First center the viewport at 0 center = bounds.center() m.translate(center.x(), center.y()) ## Now scale and translate properly m.scale(scale[0], scale[1]) st = Point(vr.center()) m.translate(-st[0], -st[1]) self.childGroup.setTransform(m) if changed[0]: self.sigXRangeChanged.emit(self, tuple(self.state['viewRange'][0])) if changed[1]: self.sigYRangeChanged.emit(self, tuple(self.state['viewRange'][1])) if any(changed): self.sigRangeChanged.emit(self, self.state['viewRange']) self.sigTransformChanged.emit(self) ## segfaults here: 1 def paint(self, p, opt, widget): if self.border is not None: bounds = self.shape() p.setPen(self.border) #p.fillRect(bounds, QtGui.QColor(0, 0, 0)) p.drawPath(bounds) def updateBackground(self): bg = self.state['background'] if bg is None: self.background.hide() else: self.background.show() self.background.setBrush(fn.mkBrush(bg)) def updateViewLists(self): try: self.window() except RuntimeError: ## this view has already been deleted; it will probably be collected shortly. return def cmpViews(a, b): wins = 100 * cmp(a.window() is self.window(), b.window() is self.window()) alpha = cmp(a.name, b.name) return wins + alpha ## make a sorted list of all named views nv = list(ViewBox.NamedViews.values()) #print "new view list:", nv sortList(nv, cmpViews) ## see pyqtgraph.python2_3.sortList if self in nv: nv.remove(self) self.menu.setViewList(nv) for ax in [0,1]: link = self.state['linkedViews'][ax] if isinstance(link, basestring): ## axis has not been linked yet; see if it's possible now for v in nv: if link == v.name: self.linkView(ax, v) #print "New view list:", nv #print "linked views:", self.state['linkedViews'] @staticmethod def updateAllViewLists(): #print "Update:", ViewBox.AllViews.keys() #print "Update:", ViewBox.NamedViews.keys() for v in ViewBox.AllViews: v.updateViewLists() @staticmethod def forgetView(vid, name): if ViewBox is None: ## can happen as python is shutting down return ## Called with ID and name of view (the view itself is no longer available) for v in ViewBox.AllViews.iterkeys(): if id(v) == vid: ViewBox.AllViews.pop(v) break ViewBox.NamedViews.pop(name, None) ViewBox.updateAllViewLists() from .ViewBoxMenu import ViewBoxMenu