Source code for pyqtgraph.widgets.GraphicsView

# -*- coding: utf-8 -*-
"""
GraphicsView.py -   Extension of QGraphicsView
Copyright 2010  Luke Campagnola
Distributed under MIT/X11 license. See license.txt for more infomation.
"""

from ..Qt import QtCore, QtGui, USE_PYSIDE

try:
    from ..Qt import QtOpenGL
    HAVE_OPENGL = True
except ImportError:
    HAVE_OPENGL = False

from ..Point import Point
import sys, os
from .FileDialog import FileDialog
from ..GraphicsScene import GraphicsScene
import numpy as np
from .. import functions as fn
from .. import debug as debug
from .. import getConfigOption

__all__ = ['GraphicsView']

[docs]class GraphicsView(QtGui.QGraphicsView): """Re-implementation of QGraphicsView that removes scrollbars and allows unambiguous control of the viewed coordinate range. Also automatically creates a GraphicsScene and a central QGraphicsWidget that is automatically scaled to the full view geometry. This widget is the basis for :class:`PlotWidget <pyqtgraph.PlotWidget>`, :class:`GraphicsLayoutWidget <pyqtgraph.GraphicsLayoutWidget>`, and the view widget in :class:`ImageView <pyqtgraph.ImageView>`. By default, the view coordinate system matches the widget's pixel coordinates and automatically updates when the view is resized. This can be overridden by setting autoPixelRange=False. The exact visible range can be set with setRange(). The view can be panned using the middle mouse button and scaled using the right mouse button if enabled via enableMouse() (but ordinarily, we use ViewBox for this functionality).""" sigDeviceRangeChanged = QtCore.Signal(object, object) sigDeviceTransformChanged = QtCore.Signal(object) sigMouseReleased = QtCore.Signal(object) sigSceneMouseMoved = QtCore.Signal(object) #sigRegionChanged = QtCore.Signal(object) sigScaleChanged = QtCore.Signal(object) lastFileDir = None
[docs] def __init__(self, parent=None, useOpenGL=None, background='default'): """ ============== ============================================================ **Arguments:** parent Optional parent widget useOpenGL If True, the GraphicsView will use OpenGL to do all of its rendering. This can improve performance on some systems, but may also introduce bugs (the combination of QGraphicsView and QGLWidget is still an 'experimental' feature of Qt) background Set the background color of the GraphicsView. Accepts any single argument accepted by :func:`mkColor <pyqtgraph.mkColor>`. By default, the background color is determined using the 'backgroundColor' configuration option (see :func:`setConfigOptions <pyqtgraph.setConfigOptions>`). ============== ============================================================ """ self.closed = False QtGui.QGraphicsView.__init__(self, parent) # This connects a cleanup function to QApplication.aboutToQuit. It is # called from here because we have no good way to react when the # QApplication is created by the user. # See pyqtgraph.__init__.py from .. import _connectCleanup _connectCleanup() if useOpenGL is None: useOpenGL = getConfigOption('useOpenGL') self.useOpenGL(useOpenGL) self.setCacheMode(self.CacheBackground) ## This might help, but it's probably dangerous in the general case.. #self.setOptimizationFlag(self.DontSavePainterState, True) self.setBackgroundRole(QtGui.QPalette.NoRole) self.setBackground(background) self.setFocusPolicy(QtCore.Qt.StrongFocus) self.setFrameShape(QtGui.QFrame.NoFrame) self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff) self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff) self.setTransformationAnchor(QtGui.QGraphicsView.NoAnchor) self.setResizeAnchor(QtGui.QGraphicsView.AnchorViewCenter) self.setViewportUpdateMode(QtGui.QGraphicsView.MinimalViewportUpdate) self.lockedViewports = [] self.lastMousePos = None self.setMouseTracking(True) self.aspectLocked = False self.range = QtCore.QRectF(0, 0, 1, 1) self.autoPixelRange = True self.currentItem = None self.clearMouse() self.updateMatrix() # GraphicsScene must have parent or expect crashes! self.sceneObj = GraphicsScene(parent=self) self.setScene(self.sceneObj) ## Workaround for PySide crash ## This ensures that the scene will outlive the view. if USE_PYSIDE: self.sceneObj._view_ref_workaround = self ## by default we set up a central widget with a grid layout. ## this can be replaced if needed. self.centralWidget = None self.setCentralItem(QtGui.QGraphicsWidget()) self.centralLayout = QtGui.QGraphicsGridLayout() self.centralWidget.setLayout(self.centralLayout) self.mouseEnabled = False self.scaleCenter = False ## should scaling center around view center (True) or mouse click (False) self.clickAccepted = False
[docs] def setAntialiasing(self, aa): """Enable or disable default antialiasing. Note that this will only affect items that do not specify their own antialiasing options.""" if aa: self.setRenderHints(self.renderHints() | QtGui.QPainter.Antialiasing) else: self.setRenderHints(self.renderHints() & ~QtGui.QPainter.Antialiasing)
[docs] def setBackground(self, background): """ Set the background color of the GraphicsView. To use the defaults specified py pyqtgraph.setConfigOption, use background='default'. To make the background transparent, use background=None. """ self._background = background if background == 'default': background = getConfigOption('background') brush = fn.mkBrush(background) self.setBackgroundBrush(brush)
def paintEvent(self, ev): self.scene().prepareForPaint() return QtGui.QGraphicsView.paintEvent(self, ev) def render(self, *args, **kwds): self.scene().prepareForPaint() return QtGui.QGraphicsView.render(self, *args, **kwds) def close(self): self.centralWidget = None self.scene().clear() self.currentItem = None self.sceneObj = None self.closed = True self.setViewport(None) super(GraphicsView, self).close() def useOpenGL(self, b=True): if b: if not HAVE_OPENGL: raise Exception("Requested to use OpenGL with QGraphicsView, but QtOpenGL module is not available.") v = QtOpenGL.QGLWidget() else: v = QtGui.QWidget() self.setViewport(v) def keyPressEvent(self, ev): self.scene().keyPressEvent(ev) ## bypass view, hand event directly to scene ## (view likes to eat arrow key events) def setCentralItem(self, item): return self.setCentralWidget(item)
[docs] def setCentralWidget(self, item): """Sets a QGraphicsWidget to automatically fill the entire view (the item will be automatically resize whenever the GraphicsView is resized).""" if self.centralWidget is not None: self.scene().removeItem(self.centralWidget) self.centralWidget = item if item is not None: self.sceneObj.addItem(item) self.resizeEvent(None)
def addItem(self, *args): return self.scene().addItem(*args) def removeItem(self, *args): return self.scene().removeItem(*args) def enableMouse(self, b=True): self.mouseEnabled = b self.autoPixelRange = (not b) def clearMouse(self): self.mouseTrail = [] self.lastButtonReleased = None def resizeEvent(self, ev): if self.closed: return if self.autoPixelRange: self.range = QtCore.QRectF(0, 0, self.size().width(), self.size().height()) GraphicsView.setRange(self, self.range, padding=0, disableAutoPixel=False) ## we do this because some subclasses like to redefine setRange in an incompatible way. self.updateMatrix() def updateMatrix(self, propagate=True): self.setSceneRect(self.range) if self.autoPixelRange: self.resetTransform() else: if self.aspectLocked: self.fitInView(self.range, QtCore.Qt.KeepAspectRatio) else: self.fitInView(self.range, QtCore.Qt.IgnoreAspectRatio) self.sigDeviceRangeChanged.emit(self, self.range) self.sigDeviceTransformChanged.emit(self) if propagate: for v in self.lockedViewports: v.setXRange(self.range, padding=0)
[docs] def viewRect(self): """Return the boundaries of the view in scene coordinates""" ## easier to just return self.range ? r = QtCore.QRectF(self.rect()) return self.viewportTransform().inverted()[0].mapRect(r)
def visibleRange(self): ## for backward compatibility return self.viewRect() def translate(self, dx, dy): self.range.adjust(dx, dy, dx, dy) self.updateMatrix() def scale(self, sx, sy, center=None): scale = [sx, sy] if self.aspectLocked: scale[0] = scale[1] if self.scaleCenter: center = None if center is None: center = self.range.center() w = self.range.width() / scale[0] h = self.range.height() / scale[1] self.range = QtCore.QRectF(center.x() - (center.x()-self.range.left()) / scale[0], center.y() - (center.y()-self.range.top()) /scale[1], w, h) self.updateMatrix() self.sigScaleChanged.emit(self) def setRange(self, newRect=None, padding=0.05, lockAspect=None, propagate=True, disableAutoPixel=True): if disableAutoPixel: self.autoPixelRange=False if newRect is None: newRect = self.visibleRange() padding = 0 padding = Point(padding) newRect = QtCore.QRectF(newRect) pw = newRect.width() * padding[0] ph = newRect.height() * padding[1] newRect = newRect.adjusted(-pw, -ph, pw, ph) scaleChanged = False if self.range.width() != newRect.width() or self.range.height() != newRect.height(): scaleChanged = True self.range = newRect #print "New Range:", self.range if self.centralWidget is not None: self.centralWidget.setGeometry(self.range) self.updateMatrix(propagate) if scaleChanged: self.sigScaleChanged.emit(self)
[docs] def scaleToImage(self, image): """Scales such that pixels in image are the same size as screen pixels. This may result in a significant performance increase.""" pxSize = image.pixelSize() image.setPxMode(True) try: self.sigScaleChanged.disconnect(image.setScaledMode) except (TypeError, RuntimeError): pass tl = image.sceneBoundingRect().topLeft() w = self.size().width() * pxSize[0] h = self.size().height() * pxSize[1] range = QtCore.QRectF(tl.x(), tl.y(), w, h) GraphicsView.setRange(self, range, padding=0) self.sigScaleChanged.connect(image.setScaledMode)
def lockXRange(self, v1): if not v1 in self.lockedViewports: self.lockedViewports.append(v1) def setXRange(self, r, padding=0.05): r1 = QtCore.QRectF(self.range) r1.setLeft(r.left()) r1.setRight(r.right()) GraphicsView.setRange(self, r1, padding=[padding, 0], propagate=False) def setYRange(self, r, padding=0.05): r1 = QtCore.QRectF(self.range) r1.setTop(r.top()) r1.setBottom(r.bottom()) GraphicsView.setRange(self, r1, padding=[0, padding], propagate=False) def wheelEvent(self, ev): QtGui.QGraphicsView.wheelEvent(self, ev) if not self.mouseEnabled: ev.ignore() return sc = 1.001 ** ev.delta() #self.scale *= sc #self.updateMatrix() self.scale(sc, sc) def setAspectLocked(self, s): self.aspectLocked = s def leaveEvent(self, ev): self.scene().leaveEvent(ev) ## inform scene when mouse leaves def mousePressEvent(self, ev): QtGui.QGraphicsView.mousePressEvent(self, ev) if not self.mouseEnabled: return self.lastMousePos = Point(ev.pos()) self.mousePressPos = ev.pos() self.clickAccepted = ev.isAccepted() if not self.clickAccepted: self.scene().clearSelection() return ## Everything below disabled for now.. def mouseReleaseEvent(self, ev): QtGui.QGraphicsView.mouseReleaseEvent(self, ev) if not self.mouseEnabled: return self.sigMouseReleased.emit(ev) self.lastButtonReleased = ev.button() return ## Everything below disabled for now.. def mouseMoveEvent(self, ev): if self.lastMousePos is None: self.lastMousePos = Point(ev.pos()) delta = Point(ev.pos() - self.lastMousePos) self.lastMousePos = Point(ev.pos()) QtGui.QGraphicsView.mouseMoveEvent(self, ev) if not self.mouseEnabled: return self.sigSceneMouseMoved.emit(self.mapToScene(ev.pos())) if self.clickAccepted: ## Ignore event if an item in the scene has already claimed it. return if ev.buttons() == QtCore.Qt.RightButton: delta = Point(np.clip(delta[0], -50, 50), np.clip(-delta[1], -50, 50)) scale = 1.01 ** delta self.scale(scale[0], scale[1], center=self.mapToScene(self.mousePressPos)) self.sigDeviceRangeChanged.emit(self, self.range) elif ev.buttons() in [QtCore.Qt.MidButton, QtCore.Qt.LeftButton]: ## Allow panning by left or mid button. px = self.pixelSize() tr = -delta * px self.translate(tr[0], tr[1]) self.sigDeviceRangeChanged.emit(self, self.range)
[docs] def pixelSize(self): """Return vector with the length and width of one view pixel in scene coordinates""" p0 = Point(0,0) p1 = Point(1,1) tr = self.transform().inverted()[0] p01 = tr.map(p0) p11 = tr.map(p1) return Point(p11 - p01)
def dragEnterEvent(self, ev): ev.ignore() ## not sure why, but for some reason this class likes to consume drag events