Source code for pyqtgraph.graphicsItems.ViewBox.ViewBox

import weakref
import sys
from copy import deepcopy
import numpy as np
from ...Qt import QtGui, QtCore
from ...python2_3 import sortList, basestring, cmp
from ...Point import Point
from ... import functions as fn
from .. ItemGroup import ItemGroup
from .. GraphicsWidget import GraphicsWidget
from ... import debug as debug
from ... import getConfigOption
from ...Qt import isQObjectAlive

__all__ = ['ViewBox']

class WeakList(object):

    def __init__(self):
        self._items = []

    def append(self, obj):
        #Add backwards to iterate backwards (to make iterating more efficient on removal).
        self._items.insert(0, weakref.ref(obj))

    def __iter__(self):
        i = len(self._items)-1
        while i >= 0:
            ref = self._items[i]
            d = ref()
            if d is None:
                del self._items[i]
            else:
                yield d
            i -= 1

class ChildGroup(ItemGroup):
    
    def __init__(self, parent):
        ItemGroup.__init__(self, parent)
        
        # Used as callback to inform ViewBox when items are added/removed from 
        # the group. 
        # Note 1: We would prefer to override itemChange directly on the 
        #         ViewBox, but this causes crashes on PySide.
        # Note 2: We might also like to use a signal rather than this callback
        #         mechanism, but this causes a different PySide crash.        
        self.itemsChangedListeners = WeakList()
 
        # excempt from telling view when transform changes
        self._GraphicsObject__inform_view_on_change = False
    
    def itemChange(self, change, value):
        ret = ItemGroup.itemChange(self, change, value)
        if change == self.ItemChildAddedChange or change == self.ItemChildRemovedChange:
            try:
                itemsChangedListeners = self.itemsChangedListeners
            except AttributeError:
                # It's possible that the attribute was already collected when the itemChange happened
                # (if it was triggered during the gc of the object).
                pass
            else:
                for listener in itemsChangedListeners:
                    listener.itemsChanged()
        return ret


[docs]class ViewBox(GraphicsWidget): """ **Bases:** :class:`GraphicsWidget <pyqtgraph.GraphicsWidget>` Box that allows internal scaling/panning of children by mouse drag. This class is usually created automatically as part of a :class:`PlotItem <pyqtgraph.PlotItem>` or :class:`Canvas <pyqtgraph.canvas.Canvas>` or with :func:`GraphicsLayout.addViewBox() <pyqtgraph.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 """ 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) sigResized = 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
[docs] def __init__(self, parent=None, border=None, lockAspect=False, enableMouse=True, invertY=False, enableMenu=True, name=None, invertX=False): """ ============== ============================================================= **Arguments:** *parent* (QGraphicsWidget) Optional parent widget *border* (QPen) Do draw a border around the view, give any single argument accepted by :func:`mkPen <pyqtgraph.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 <pyqtgraph.ViewBox.invertY>` *invertX* (bool) See :func:`invertX <pyqtgraph.ViewBox.invertX>` *enableMenu* (bool) Whether to display a context menu when right-clicking on the ViewBox background. *name* (str) Used to register this ViewBox so that it appears in the "Link axis" dropdown inside other ViewBox context menus. This allows the user to manually link the axes of any other view to this one. ============== ============================================================= """ GraphicsWidget.__init__(self, parent) self.name = None self.linksBlocked = False self.addedItems = [] #self.gView = view #self.showGrid = showGrid self._matrixNeedsUpdate = True ## indicates that range has changed, but matrix update was deferred self._autoRangeNeedsUpdate = True ## indicates auto-range needs to be recomputed. self._lastScene = None ## stores reference to the last known scene this view was a part of. 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, 'xInverted': invertX, '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 getConfigOption('leftButtonPan') else ViewBox.RectMode, 'enableMenu': enableMenu, 'wheelScaleFactor': -1.0 / 8.0, 'background': None, # Limits 'limits': { 'xLimits': [None, None], # Maximum and minimum visible X values 'yLimits': [None, None], # Maximum and minimum visible Y values 'xRange': [None, None], # Maximum and minimum X range 'yRange': [None, None], # Maximum and minimum Y range } } self._updatingRange = False ## Used to break recursive loops. See updateAutoRange. self._itemBoundsCache = weakref.WeakKeyDictionary() self.locateGroup = None ## items displayed when using ViewBox.locate(item) 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.itemsChangedListeners.append(self) 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.setZValue(1e9) self.rbScaleBox.hide() self.addItem(self.rbScaleBox, ignoreBounds=True) ## show target rect for debugging self.target = QtGui.QGraphicsRectItem(0, 0, 1, 1) self.target.setPen(fn.mkPen('r')) self.target.setParentItem(self) self.target.hide() 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()
[docs] def register(self, name): """ Add this ViewBox to the registered list of views. This allows users to manually link the axes of any other ViewBox to this one. The specified *name* will appear in the drop-down lists for axis linking in the context menus of 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)
[docs] def unregister(self): """ Remove this ViewBox from the list of linkable views. (see :func:`register() <pyqtgraph.ViewBox.register>`) """ del ViewBox.AllViews[self] if self.name is not None: del ViewBox.NamedViews[self.name]
def close(self): self.clear() self.unregister() def implements(self, interface): return interface == 'ViewBox' # removed due to https://bugreports.qt-project.org/browse/PYSIDE-86 #def itemChange(self, change, value): ## Note: Calling QWidget.itemChange causes segv in python 3 + PyQt ##ret = QtGui.QGraphicsItem.itemChange(self, change, value) #ret = GraphicsWidget.itemChange(self, change, value) #if change == self.ItemSceneChange: #scene = self.scene() #if scene is not None and hasattr(scene, 'sigPrepareForPaint'): #scene.sigPrepareForPaint.disconnect(self.prepareForPaint) #elif change == self.ItemSceneHasChanged: #scene = self.scene() #if scene is not None and hasattr(scene, 'sigPrepareForPaint'): #scene.sigPrepareForPaint.connect(self.prepareForPaint) #return ret def checkSceneChange(self): # ViewBox needs to receive sigPrepareForPaint from its scene before # being painted. However, we have no way of being informed when the # scene has changed in order to make this connection. The usual way # to do this is via itemChange(), but bugs prevent this approach # (see above). Instead, we simply check at every paint to see whether # (the scene has changed. scene = self.scene() if scene == self._lastScene: return if self._lastScene is not None and hasattr(self.lastScene, 'sigPrepareForPaint'): self._lastScene.sigPrepareForPaint.disconnect(self.prepareForPaint) if scene is not None and hasattr(scene, 'sigPrepareForPaint'): scene.sigPrepareForPaint.connect(self.prepareForPaint) self.prepareForPaint() self._lastScene = scene def prepareForPaint(self): #autoRangeEnabled = (self.state['autoRange'][0] is not False) or (self.state['autoRange'][1] is not False) # don't check whether auto range is enabled here--only check when setting dirty flag. if self._autoRangeNeedsUpdate: # and autoRangeEnabled: self.updateAutoRange() if self._matrixNeedsUpdate: self.updateMatrix()
[docs] 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
[docs] 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.updateViewRange() self.sigStateChanged.emit(self)
[docs] def setBackgroundColor(self, color): """ Set the background color of the ViewBox. If color is None, then no background will be drawn. Added in version 0.9.9 """ self.background.setVisible(color is not None) self.state['background'] = color self.updateBackground()
[docs] 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
[docs] 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)
[docs] 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) scene = self.scene() if scene is not None and scene is not item.scene(): scene.addItem(item) ## Necessary due to Qt bug: https://bugreports.qt-project.org/browse/QTBUG-18616 item.setParentItem(self.childGroup) if not ignoreBounds: self.addedItems.append(item) self.updateAutoRange()
#print "addItem:", item, item.boundingRect()
[docs] def removeItem(self, item): """Remove an item from this view.""" try: self.addedItems.remove(item) except: pass self.scene().removeItem(item) self.updateAutoRange()
def clear(self): for i in self.addedItems[:]: self.removeItem(i) for ch in self.childGroup.childItems(): ch.setParentItem(None) def resizeEvent(self, ev): self.linkedXChanged() self.linkedYChanged() self.updateAutoRange() self.updateViewRange() self._matrixNeedsUpdate = True self.sigStateChanged.emit(self) self.background.setRect(self.rect()) self.sigResized.emit(self)
[docs] 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
[docs] 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
[docs] 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 _resetTarget(self): # Reset target range to exactly match current view range. # This is used during mouse interaction to prevent unpredictable # behavior (because the user is unaware of targetRange). if self.state['aspectLocked'] is False: # (interferes with aspect locking) self.state['targetRange'] = [self.state['viewRange'][0][:], self.state['viewRange'][1][:]]
[docs] def setRange(self, rect=None, xRange=None, yRange=None, padding=None, update=True, disableAutoRange=True): """ Set the visible range of the ViewBox. Must specify at least one of *rect*, *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 set between 0.02 and 0.1 depending on the size of the ViewBox. *update* (bool) If True, update the range of the ViewBox immediately. Otherwise, the update is deferred until before the next render. *disableAutoRange* (bool) If True, auto-ranging is diabled. Otherwise, it is left unchanged. ================== ===================================================================== """ #print self.name, "ViewBox.setRange", rect, xRange, yRange, padding #import traceback #traceback.print_stack() changes = {} # axes setRequested = [False, False] if rect is not None: changes = {0: [rect.left(), rect.right()], 1: [rect.top(), rect.bottom()]} setRequested = [True, True] if xRange is not None: changes[0] = xRange setRequested[0] = True if yRange is not None: changes[1] = yRange setRequested[1] = True if len(changes) == 0: print(rect) raise Exception("Must specify at least one of rect, xRange, or yRange. (gave rect=%s)" % str(type(rect))) # Update axes one at a time changed = [False, False] for ax, range in changes.items(): mn = min(range) mx = max(range) # If we requested 0 range, try to preserve previous scale. # Otherwise just pick an arbitrary scale. if mn == mx: dy = self.state['viewRange'][ax][1] - self.state['viewRange'][ax][0] if dy == 0: dy = 1 mn -= dy*0.5 mx += dy*0.5 xpad = 0.0 # Make sure no nan/inf get through if not all(np.isfinite([mn, mx])): raise Exception("Cannot set range [%s, %s]" % (str(mn), str(mx))) # Apply padding if padding is None: xpad = self.suggestPadding(ax) else: xpad = padding p = (mx-mn) * xpad mn -= p mx += p # Set target range if self.state['targetRange'][ax] != [mn, mx]: self.state['targetRange'][ax] = [mn, mx] changed[ax] = True # Update viewRange to match targetRange as closely as possible while # accounting for aspect ratio constraint lockX, lockY = setRequested if lockX and lockY: lockX = False lockY = False self.updateViewRange(lockX, lockY) # Disable auto-range for each axis that was requested to be set if disableAutoRange: xOff = False if setRequested[0] else None yOff = False if setRequested[1] else None self.enableAutoRange(x=xOff, y=yOff) changed.append(True) # If nothing has changed, we are done. if any(changed): #if update and self.matrixNeedsUpdate: #self.updateMatrix(changed) #return self.sigStateChanged.emit(self) # Update target rect for debugging if self.target.isVisible(): self.target.setRect(self.mapRectFromItem(self.childGroup, self.targetRect())) # If ortho axes have auto-visible-only, update them now # Note that aspect ratio constraints and auto-visible probably do not work together.. if changed[0] and self.state['autoVisibleOnly'][1] and (self.state['autoRange'][0] is not False): self._autoRangeNeedsUpdate = True #self.updateAutoRange() ## Maybe just indicate that auto range needs to be updated? elif changed[1] and self.state['autoVisibleOnly'][0] and (self.state['autoRange'][1] is not False): self._autoRangeNeedsUpdate = True
#self.updateAutoRange() ## Update view matrix only if requested #if update: #self.updateMatrix(changed) ## Otherwise, indicate that the matrix needs to be updated #else: #self.matrixNeedsUpdate = True ## Inform linked views that the range has changed <<This should be moved>> #for ax, range in changes.items(): #link = self.linkedView(ax) #if link is not None: #link.linkedViewChanged(self, ax)
[docs] def setYRange(self, min, max, padding=None, 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. (by default, this value is between 0.02 and 0.1 depending on the size of the ViewBox) """ self.setRange(yRange=[min, max], update=update, padding=padding)
[docs] def setXRange(self, min, max, padding=None, 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. (by default, this value is between 0.02 and 0.1 depending on the size of the ViewBox) """ self.setRange(xRange=[min, max], update=update, padding=padding)
[docs] def autoRange(self, padding=None, items=None, 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. ============== ============================================================ **Arguments:** padding The fraction of the total data range to add on to the final visible range. By default, this value is set between 0.02 and 0.1 depending on the size of the ViewBox. items If specified, this is a list of items to consider when determining the visible range. ============== ============================================================ """ if item is None: bounds = self.childrenBoundingRect(items=items) else: print("Warning: ViewBox.autoRange(item=__) is deprecated. Use 'items' argument instead.") bounds = self.mapFromItemToView(item, item.boundingRect()).boundingRect() if bounds is not None: self.setRange(bounds, padding=padding)
def suggestPadding(self, axis): l = self.width() if axis==0 else self.height() if l > 0: padding = np.clip(1./(l**0.5), 0.02, 0.1) else: padding = 0.02 return padding
[docs] def setLimits(self, **kwds): """ Set limits that constrain the possible view ranges. **Panning limits**. The following arguments define the region within the viewbox coordinate system that may be accessed by panning the view. =========== ============================================================ xMin Minimum allowed x-axis value xMax Maximum allowed x-axis value yMin Minimum allowed y-axis value yMax Maximum allowed y-axis value =========== ============================================================ **Scaling limits**. These arguments prevent the view being zoomed in or out too far. =========== ============================================================ minXRange Minimum allowed left-to-right span across the view. maxXRange Maximum allowed left-to-right span across the view. minYRange Minimum allowed top-to-bottom span across the view. maxYRange Maximum allowed top-to-bottom span across the view. =========== ============================================================ Added in version 0.9.9 """ update = False allowed = ['xMin', 'xMax', 'yMin', 'yMax', 'minXRange', 'maxXRange', 'minYRange', 'maxYRange'] for kwd in kwds: if kwd not in allowed: raise ValueError("Invalid keyword argument '%s'." % kwd) #for kwd in ['xLimits', 'yLimits', 'minRange', 'maxRange']: #if kwd in kwds and self.state['limits'][kwd] != kwds[kwd]: #self.state['limits'][kwd] = kwds[kwd] #update = True for axis in [0,1]: for mnmx in [0,1]: kwd = [['xMin', 'xMax'], ['yMin', 'yMax']][axis][mnmx] lname = ['xLimits', 'yLimits'][axis] if kwd in kwds and self.state['limits'][lname][mnmx] != kwds[kwd]: self.state['limits'][lname][mnmx] = kwds[kwd] update = True kwd = [['minXRange', 'maxXRange'], ['minYRange', 'maxYRange']][axis][mnmx] lname = ['xRange', 'yRange'][axis] if kwd in kwds and self.state['limits'][lname][mnmx] != kwds[kwd]: self.state['limits'][lname][mnmx] = kwds[kwd] update = True if update: self.updateViewRange()
[docs] def scaleBy(self, s=None, center=None, x=None, y=None): """ Scale by *s* around given center point (or center of view). *s* may be a Point or tuple (x, y). Optionally, x or y may be specified individually. This allows the other axis to be left unaffected (note that using a scale factor of 1.0 may cause slight changes due to floating-point error). """ if s is not None: scale = Point(s) else: scale = [x, y] affect = [True, True] if scale[0] is None and scale[1] is None: return elif scale[0] is None: affect[0] = False scale[0] = 1.0 elif scale[1] is None: affect[1] = False scale[1] = 1.0 scale = Point(scale) if self.state['aspectLocked'] is not False: scale[0] = 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 if not affect[0]: self.setYRange(tl.y(), br.y(), padding=0) elif not affect[1]: self.setXRange(tl.x(), br.x(), padding=0) else: self.setRange(QtCore.QRectF(tl, br), padding=0)
[docs] def translateBy(self, t=None, x=None, y=None): """ Translate the view by *t*, which may be a Point or tuple (x, y). Alternately, x or y may be specified independently, leaving the other axis unchanged (note that using a translation of 0 may still cause small changes due to floating-point error). """ vr = self.targetRect() if t is not None: t = Point(t) self.setRange(vr.translated(t), padding=0) else: if x is not None: x = vr.left()+x, vr.right()+x if y is not None: y = vr.top()+y, vr.bottom()+y if x is not None or y is not None: self.setRange(xRange=x, yRange=y, padding=0)
[docs] def enableAutoRange(self, axis=None, enable=True, x=None, y=None): """ 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() # support simpler interface: if x is not None or y is not None: if x is not None: self.enableAutoRange(ViewBox.XAxis, x) if y is not None: self.enableAutoRange(ViewBox.YAxis, y) return if enable is True: enable = 1.0 if axis is None: axis = ViewBox.XYAxes needAutoRangeUpdate = False if axis == ViewBox.XYAxes or axis == 'xy': axes = [0, 1] elif axis == ViewBox.XAxis or axis == 'x': axes = [0] elif axis == ViewBox.YAxis or axis == 'y': axes = [1] else: raise Exception('axis argument must be ViewBox.XAxis, ViewBox.YAxis, or ViewBox.XYAxes.') for ax in axes: if self.state['autoRange'][ax] != enable: # If we are disabling, do one last auto-range to make sure that # previously scheduled auto-range changes are enacted if enable is False and self._autoRangeNeedsUpdate: self.updateAutoRange() self.state['autoRange'][ax] = enable self._autoRangeNeedsUpdate |= (enable is not False) self.update() #if needAutoRangeUpdate: # self.updateAutoRange() self.sigStateChanged.emit(self)
[docs] 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 w2 = (targetRect[ax][1]-targetRect[ax][0]) / 2. childRange[ax] = [x-w2, x+w2] else: padding = self.suggestPadding(ax) wp = (xr[1] - xr[0]) * padding childRange[ax][0] -= wp childRange[ax][1] += wp targetRect[ax] = childRange[ax] args['xRange' if ax == 0 else 'yRange'] = targetRect[ax] if len(args) == 0: return args['padding'] = 0 args['disableAutoRange'] = False # check for and ignore bad ranges for k in ['xRange', 'yRange']: if k in args: if not np.all(np.isfinite(args[k])): r = args.pop(k) #print("Warning: %s is invalid: %s" % (k, str(r)) self.setRange(**args) finally: self._autoRangeNeedsUpdate = False self._updatingRange = False
[docs] 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) oldLink.sigResized.disconnect(slot) except (TypeError, RuntimeError): ## 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) view.sigResized.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 #print self.name, "ViewBox.linkedViewChanged", axis, view.viewRange()[axis] 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() if self.xInverted(): x1 = vr.left() + (sg.right()-vg.right()) * upp else: 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() if self.yInverted(): y2 = vr.bottom() + (sg.bottom()-vg.bottom()) * upp else: y2 = vr.bottom() + (sg.top()-vg.top()) * upp y1 = y2 - sg.height() * upp self.enableAutoRange(ViewBox.YAxis, False) self.setYRange(y1, y2, padding=0) finally: view.blockLink(False)
[docs] 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._itemBoundsCache.pop(item, None) if (self.state['autoRange'][0] is not False) or (self.state['autoRange'][1] is not False): self._autoRangeNeedsUpdate = True self.update() #self.updateAutoRange() def _invertAxis(self, ax, inv): key = 'xy'[ax] + 'Inverted' if self.state[key] == inv: return self.state[key] = inv self._matrixNeedsUpdate = True # updateViewRange won't detect this for us self.updateViewRange() self.update() self.sigStateChanged.emit(self) self.sigYRangeChanged.emit(self, tuple(self.state['viewRange'][ax]))
[docs] 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._invertAxis(1, b)
def yInverted(self): return self.state['yInverted']
[docs] def invertX(self, b=True): """ By default, the positive x-axis points rightward on the screen. Use invertX(True) to reverse the x-axis. """ self._invertAxis(0, b)
def xInverted(self): return self.state['xInverted']
[docs] 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 (xScale/yScale), or use None to lock in the current ratio. """ if not lock: if self.state['aspectLocked'] == False: return self.state['aspectLocked'] = False else: rect = self.rect() vr = self.viewRect() if rect.height() == 0 or vr.width() == 0 or vr.height() == 0: currentRatio = 1.0 else: currentRatio = (rect.width()/float(rect.height())) / (vr.width()/vr.height()) if ratio is None: ratio = currentRatio if self.state['aspectLocked'] == ratio: # nothing to change return 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.updateViewRange() self.updateAutoRange() self.updateViewRange() self.sigStateChanged.emit(self)
[docs] 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) """ if self._matrixNeedsUpdate: self.updateMatrix() m = self.childGroup.transform() #m1 = QtGui.QTransform() #m1.translate(self.childGroup.pos().x(), self.childGroup.pos().y()) return m #*m1
[docs] 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)
[docs] 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)
[docs] def mapSceneToView(self, obj): """Maps from scene coordinates to the coordinate system displayed inside the ViewBox""" return self.mapToView(self.mapFromScene(obj))
[docs] def mapViewToScene(self, obj): """Maps from the coordinate system displayed inside the ViewBox to scene coordinates""" return self.mapToScene(self.mapFromView(obj))
[docs] 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))
[docs] 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))
[docs] 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())
[docs] 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._resetTarget() 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): menu = self.getMenu(ev) self.scene().addParentContextMenus(self, menu, ev) menu.popup(ev.screenPos().toPoint()) def getMenu(self, ev): return self.menu def getContextMenus(self, event): return self.menu.actions() if self.menuEnabled() else [] 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 mouseEnabled = np.array(self.state['mouseEnabled'], dtype=np.float) mask = mouseEnabled.copy() 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)) x = tr.x() if mask[0] == 1 else None y = tr.y() if mask[1] == 1 else None self._resetTarget() if x is not None or y is not None: self.translateBy(x=x, y=y) 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) x = s[0] if mouseEnabled[0] == 1 else None y = s[1] if mouseEnabled[1] == 1 else None center = Point(tr.map(ev.buttonDownPos(QtCore.Qt.RightButton))) self._resetTarget() self.scaleBy(x=x, y=y, center=center) self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
[docs] 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): if len(self.axHistory) == 0: return 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)
[docs] 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
[docs] def childrenBounds(self, frac=None, orthoRange=(None,None), items=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. """ profiler = debug.Profiler() if items is None: items = self.addedItems ## measure pixel dimensions in view box px, py = [v.length() if v is not None else 0 for v in self.childGroup.pixelVectors()] ## First collect all boundary information itemBounds = [] for item in items: if not item.isVisible(): continue useX = True useY = True if hasattr(item, 'dataBounds'): #bounds = self._itemBoundsCache.get(item, None) #if bounds is None: 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]) pxPad = 0 if not hasattr(item, 'pixelPadding') else item.pixelPadding() if xr is None or (xr[0] is None and xr[1] is None) or np.isnan(xr).any() or np.isinf(xr).any(): useX = False xr = (0,0) if yr is None or (yr[0] is None and yr[1] is None) or np.isnan(yr).any() or np.isinf(yr).any(): useY = False yr = (0,0) bounds = QtCore.QRectF(xr[0], yr[0], xr[1]-xr[0], yr[1]-yr[0]) bounds = self.mapFromItemToView(item, bounds).boundingRect() if not any([useX, useY]): continue ## If we are ignoring only one axis, we need to check for rotations if useX != useY: ## != means xor ang = round(item.transformAngle()) if ang == 0 or ang == 180: pass elif ang == 90 or ang == 270: useX, useY = useY, useX else: ## Item is rotated at non-orthogonal angle, ignore bounds entirely. ## Not really sure what is the expected behavior in this case. continue ## need to check for item rotations and decide how best to apply this boundary. itemBounds.append((bounds, useX, useY, pxPad)) #self._itemBoundsCache[item] = (bounds, useX, useY) #else: #bounds, useX, useY = bounds else: if int(item.flags() & item.ItemHasNoContents) > 0: continue else: bounds = item.boundingRect() bounds = self.mapFromItemToView(item, bounds).boundingRect() itemBounds.append((bounds, True, True, 0)) #print itemBounds ## determine tentative new range range = [None, None] for bounds, useX, useY, px in itemBounds: 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()] profiler() #print "range", range ## Now expand any bounds that have a pixel margin ## This must be done _after_ we have a good estimate of the new range ## to ensure that the pixel size is roughly accurate. w = self.width() h = self.height() #print "w:", w, "h:", h if w > 0 and range[0] is not None: pxSize = (range[0][1] - range[0][0]) / w for bounds, useX, useY, px in itemBounds: if px == 0 or not useX: continue range[0][0] = min(range[0][0], bounds.left() - px*pxSize) range[0][1] = max(range[0][1], bounds.right() + px*pxSize) if h > 0 and range[1] is not None: pxSize = (range[1][1] - range[1][0]) / h for bounds, useX, useY, px in itemBounds: if px == 0 or not useY: continue range[1][0] = min(range[1][0], bounds.top() - px*pxSize) range[1][1] = max(range[1][1], bounds.bottom() + px*pxSize) 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 updateViewRange(self, forceX=False, forceY=False): ## Update viewRange to match targetRange as closely as possible, given ## aspect ratio constraints. The *force* arguments are used to indicate ## which axis (if any) should be unchanged when applying constraints. viewRange = [self.state['targetRange'][0][:], self.state['targetRange'][1][:]] changed = [False, False] #-------- Make correction for aspect ratio constraint ---------- # aspect is (widget w/h) / (view range w/h) aspect = self.state['aspectLocked'] # size ratio / view ratio tr = self.targetRect() bounds = self.rect() if aspect is not False and 0 not in [aspect, tr.height(), bounds.height(), bounds.width()]: ## This is the view range aspect ratio we have requested targetRatio = tr.width() / tr.height() if tr.height() != 0 else 1 ## This is the view range aspect ratio we need to obey aspect constraint viewRatio = (bounds.width() / bounds.height() if bounds.height() != 0 else 1) / aspect viewRatio = 1 if viewRatio == 0 else viewRatio # Decide which range to keep unchanged #print self.name, "aspect:", aspect, "changed:", changed, "auto:", self.state['autoRange'] if forceX: ax = 0 elif forceY: ax = 1 else: # if we are not required to keep a particular axis unchanged, # then make the entire target range visible ax = 0 if targetRatio > viewRatio else 1 if ax == 0: ## view range needs to be taller than target dy = 0.5 * (tr.width() / viewRatio - tr.height()) if dy != 0: changed[1] = True viewRange[1] = [self.state['targetRange'][1][0] - dy, self.state['targetRange'][1][1] + dy] else: ## view range needs to be wider than target dx = 0.5 * (tr.height() * viewRatio - tr.width()) if dx != 0: changed[0] = True viewRange[0] = [self.state['targetRange'][0][0] - dx, self.state['targetRange'][0][1] + dx] # ----------- Make corrections for view limits ----------- limits = (self.state['limits']['xLimits'], self.state['limits']['yLimits']) minRng = [self.state['limits']['xRange'][0], self.state['limits']['yRange'][0]] maxRng = [self.state['limits']['xRange'][1], self.state['limits']['yRange'][1]] for axis in [0, 1]: if limits[axis][0] is None and limits[axis][1] is None and minRng[axis] is None and maxRng[axis] is None: continue # max range cannot be larger than bounds, if they are given if limits[axis][0] is not None and limits[axis][1] is not None: if maxRng[axis] is not None: maxRng[axis] = min(maxRng[axis], limits[axis][1]-limits[axis][0]) else: maxRng[axis] = limits[axis][1]-limits[axis][0] #print "\nLimits for axis %d: range=%s min=%s max=%s" % (axis, limits[axis], minRng[axis], maxRng[axis]) #print "Starting range:", viewRange[axis] # Apply xRange, yRange diff = viewRange[axis][1] - viewRange[axis][0] if maxRng[axis] is not None and diff > maxRng[axis]: delta = maxRng[axis] - diff changed[axis] = True elif minRng[axis] is not None and diff < minRng[axis]: delta = minRng[axis] - diff changed[axis] = True else: delta = 0 viewRange[axis][0] -= delta/2. viewRange[axis][1] += delta/2. #print "after applying min/max:", viewRange[axis] # Apply xLimits, yLimits mn, mx = limits[axis] if mn is not None and viewRange[axis][0] < mn: delta = mn - viewRange[axis][0] viewRange[axis][0] += delta viewRange[axis][1] += delta changed[axis] = True elif mx is not None and viewRange[axis][1] > mx: delta = mx - viewRange[axis][1] viewRange[axis][0] += delta viewRange[axis][1] += delta changed[axis] = True #print "after applying edge limits:", viewRange[axis] changed = [(viewRange[i][0] != self.state['viewRange'][i][0]) or (viewRange[i][1] != self.state['viewRange'][i][1]) for i in (0,1)] self.state['viewRange'] = viewRange # emit range change signals 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.update() self._matrixNeedsUpdate = True # Inform linked views that the range has changed for ax in [0, 1]: if not changed[ax]: continue link = self.linkedView(ax) if link is not None: link.linkedViewChanged(self, ax) def updateMatrix(self, changed=None): ## Make the childGroup's transform match the requested viewRange. bounds = self.rect() vr = self.viewRect() 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) if self.state['xInverted']: 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) self.sigTransformChanged.emit(self) ## segfaults here: 1 self._matrixNeedsUpdate = False def paint(self, p, opt, widget): self.checkSceneChange() if self.border is not None: bounds = self.shape() p.setPen(self.border) #p.fillRect(bounds, QtGui.QColor(0, 0, 0)) p.drawPath(bounds) #p.setPen(fn.mkPen('r')) #path = QtGui.QPainterPath() #path.addRect(self.targetRect()) #tr = self.mapFromView(path) #p.drawPath(tr) 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 if QtGui.QApplication.instance() is None: return ## Called with ID and name of view (the view itself is no longer available) for v in list(ViewBox.AllViews.keys()): if id(v) == vid: ViewBox.AllViews.pop(v) break ViewBox.NamedViews.pop(name, None) ViewBox.updateAllViewLists() @staticmethod def quit(): ## called when the application is about to exit. ## this disables all callbacks, which might otherwise generate errors if invoked during exit. for k in ViewBox.AllViews: if isQObjectAlive(k) and getConfigOption('crashWarning'): sys.stderr.write('Warning: ViewBox should be closed before application exit.\n') try: k.destroyed.disconnect() except RuntimeError: ## signal is already disconnected. pass except TypeError: ## view has already been deleted (?) pass except AttributeError: # PySide has deleted signal pass
[docs] def locate(self, item, timeout=3.0, children=False): """ Temporarily display the bounding rect of an item and lines connecting to the center of the view. This is useful for determining the location of items that may be out of the range of the ViewBox. if allChildren is True, then the bounding rect of all item's children will be shown instead. """ self.clearLocate() if item.scene() is not self.scene(): raise Exception("Item does not share a scene with this ViewBox.") c = self.viewRect().center() if children: br = self.mapFromItemToView(item, item.childrenBoundingRect()).boundingRect() else: br = self.mapFromItemToView(item, item.boundingRect()).boundingRect() g = ItemGroup() g.setParentItem(self.childGroup) self.locateGroup = g g.box = QtGui.QGraphicsRectItem(br) g.box.setParentItem(g) g.lines = [] for p in (br.topLeft(), br.bottomLeft(), br.bottomRight(), br.topRight()): line = QtGui.QGraphicsLineItem(c.x(), c.y(), p.x(), p.y()) line.setParentItem(g) g.lines.append(line) for item in g.childItems(): item.setPen(fn.mkPen(color='y', width=3)) g.setZValue(1000000) if children: g.path = QtGui.QGraphicsPathItem(g.childrenShape()) else: g.path = QtGui.QGraphicsPathItem(g.shape()) g.path.setParentItem(g) g.path.setPen(fn.mkPen('g')) g.path.setZValue(100) QtCore.QTimer.singleShot(timeout*1000, self.clearLocate)
def clearLocate(self): if self.locateGroup is None: return self.scene().removeItem(self.locateGroup) self.locateGroup = None
from .ViewBoxMenu import ViewBoxMenu