pyqtgraph/GraphicsView.py
Luke Campagnola c55392965f Merge from ACQ4:
- Lots of bug fixes
 - API change in PlotItem.plot(...)
 - Started replacing QObjectWorkaround with QWidget
 - Made plotCurveItems clickable
 - Added curve-following arrows
2011-02-07 19:40:38 -05:00

462 lines
17 KiB
Python

# -*- coding: utf-8 -*-
"""
GraphicsView.py - Extension of QGraphicsView
Copyright 2010 Luke Campagnola
Distributed under MIT/X11 license. See license.txt for more infomation.
"""
from PyQt4 import QtCore, QtGui, QtOpenGL, QtSvg
#from numpy import vstack
#import time
from Point import *
#from vector import *
import sys
class GraphicsView(QtGui.QGraphicsView):
def __init__(self, parent=None, useOpenGL=True):
"""Re-implementation of QGraphicsView that removes scrollbars and allows unambiguous control of the
viewed coordinate range. Also automatically creates a QGraphicsScene and a central QGraphicsWidget
that is automatically scaled to the full view geometry.
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()."""
QtGui.QGraphicsView.__init__(self, parent)
if 'linux' in sys.platform: ## linux has bugs in opengl implementation
useOpenGL = False
self.useOpenGL(useOpenGL)
palette = QtGui.QPalette()
brush = QtGui.QBrush(QtGui.QColor(0,0,0))
brush.setStyle(QtCore.Qt.SolidPattern)
palette.setBrush(QtGui.QPalette.Active,QtGui.QPalette.Base,brush)
brush = QtGui.QBrush(QtGui.QColor(0,0,0))
brush.setStyle(QtCore.Qt.SolidPattern)
palette.setBrush(QtGui.QPalette.Inactive,QtGui.QPalette.Base,brush)
brush = QtGui.QBrush(QtGui.QColor(244,244,244))
brush.setStyle(QtCore.Qt.SolidPattern)
palette.setBrush(QtGui.QPalette.Disabled,QtGui.QPalette.Base,brush)
self.setPalette(palette)
self.setProperty("cursor",QtCore.QVariant(QtCore.Qt.ArrowCursor))
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.setResizeAnchor(QtGui.QGraphicsView.NoAnchor)
self.setViewportUpdateMode(QtGui.QGraphicsView.SmartViewportUpdate)
self.setSceneRect(QtCore.QRectF(-1e10, -1e10, 2e10, 2e10))
#self.setSceneRect(1, 1, 0, 0) ## Set an empty (but non-zero) scene rect so that the view doesn't try to automatically update for us.
#self.setInteractive(False)
self.lockedViewports = []
self.lastMousePos = None
#self.setMouseTracking(False)
self.aspectLocked = False
self.yInverted = True
self.range = QtCore.QRectF(0, 0, 1, 1)
self.autoPixelRange = True
self.currentItem = None
self.clearMouse()
self.updateMatrix()
self.sceneObj = QtGui.QGraphicsScene()
self.setScene(self.sceneObj)
## 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
def useOpenGL(self, b=True):
if b:
v = QtOpenGL.QGLWidget()
else:
v = QtGui.QWidget()
#v.setStyleSheet("background-color: #000000;")
self.setViewport(v)
def keyPressEvent(self, ev):
ev.ignore()
def setCentralItem(self, item):
"""Sets a QGraphicsWidget to automatically fill the entire view."""
if self.centralWidget is not None:
self.scene().removeItem(self.centralWidget)
self.centralWidget = item
self.sceneObj.addItem(item)
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.autoPixelRange:
self.range = QtCore.QRectF(0, 0, self.size().width(), self.size().height())
self.setRange(self.range, padding=0, disableAutoPixel=False)
self.updateMatrix()
def updateMatrix(self, propagate=True):
#print "udpateMatrix:"
translate = Point(self.range.center())
if self.range.width() == 0 or self.range.height() == 0:
return
scale = Point(self.size().width()/self.range.width(), self.size().height()/self.range.height())
m = QtGui.QMatrix()
## First center the viewport at 0
self.resetMatrix()
center = self.viewportTransform().inverted()[0].map(Point(self.width()/2., self.height()/2.))
if self.yInverted:
m.translate(center.x(), center.y())
#print " inverted; translate", center.x(), center.y()
else:
m.translate(center.x(), -center.y())
#print " not inverted; translate", center.x(), -center.y()
## Now scale and translate properly
if self.aspectLocked:
scale = Point(scale.min())
if not self.yInverted:
scale = scale * Point(1, -1)
m.scale(scale[0], scale[1])
#print " scale:", scale
st = translate
m.translate(-st[0], -st[1])
#print " translate:", st
self.setMatrix(m)
self.currentScale = scale
self.emit(QtCore.SIGNAL('viewChanged'), self.range)
if propagate:
for v in self.lockedViewports:
v.setXRange(self.range, padding=0)
def visibleRange(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 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]
#adj = (self.range.width()*0.5*(1.0-(1.0/scale[0])), self.range.height()*0.5*(1.0-(1.0/scale[1])))
#print "======\n", scale, adj
#print self.range
#self.range.adjust(adj[0], adj[1], -adj[0], -adj[1])
#print self.range
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()
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]
self.range = newRect.adjusted(-pw, -ph, pw, ph)
#print "New Range:", self.range
self.centralWidget.setGeometry(self.range)
self.updateMatrix(propagate)
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())
self.setRange(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())
self.setRange(r1, padding=[0, padding], propagate=False)
def invertY(self, invert=True):
#if self.yInverted != invert:
#self.scale[1] *= -1.
self.yInverted = invert
self.updateMatrix()
def wheelEvent(self, ev):
if not self.mouseEnabled:
return
QtGui.QGraphicsView.wheelEvent(self, ev)
sc = 1.001 ** ev.delta()
#self.scale *= sc
#self.updateMatrix()
self.scale(sc, sc)
def setAspectLocked(self, s):
self.aspectLocked = s
#def mouseDoubleClickEvent(self, ev):
#QtGui.QGraphicsView.mouseDoubleClickEvent(self, ev)
#pass
### This function is here because interactive mode is disabled due to bugs.
#def graphicsSceneEvent(self, ev, pev=None, fev=None):
#ev1 = GraphicsSceneMouseEvent()
#ev1.setPos(QtCore.QPointF(ev.pos().x(), ev.pos().y()))
#ev1.setButtons(ev.buttons())
#ev1.setButton(ev.button())
#ev1.setModifiers(ev.modifiers())
#ev1.setScenePos(self.mapToScene(QtCore.QPoint(ev.pos())))
#if pev is not None:
#ev1.setLastPos(pev.pos())
#ev1.setLastScenePos(pev.scenePos())
#ev1.setLastScreenPos(pev.screenPos())
#if fev is not None:
#ev1.setButtonDownPos(fev.pos())
#ev1.setButtonDownScenePos(fev.scenePos())
#ev1.setButtonDownScreenPos(fev.screenPos())
#return ev1
def mousePressEvent(self, ev):
QtGui.QGraphicsView.mousePressEvent(self, ev)
#print "Press over:"
#for i in self.items(ev.pos()):
# print i.zValue(), int(i.acceptedMouseButtons()), i, i.scenePos()
#print "Event accepted:", ev.isAccepted()
#print "Grabber:", self.scene().mouseGrabberItem()
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..
#self.currentItem = None
#maxZ = None
#for i in self.items(ev.pos()):
#if maxZ is None or maxZ < i.zValue():
#self.currentItem = i
#maxZ = i.zValue()
#print "make event"
#self.pev = self.graphicsSceneEvent(ev)
#self.fev = self.pev
#if self.currentItem is not None:
#self.currentItem.mousePressEvent(self.pev)
##self.clearMouse()
##self.mouseTrail.append(Point(self.mapToScene(ev.pos())))
#self.emit(QtCore.SIGNAL("mousePressed(PyQt_PyObject)"), self.mouseTrail)
def mouseReleaseEvent(self, ev):
QtGui.QGraphicsView.mouseReleaseEvent(self, ev)
if not self.mouseEnabled:
return
#self.mouseTrail.append(Point(self.mapToScene(ev.pos())))
self.emit(QtCore.SIGNAL("mouseReleased"), ev)
self.lastButtonReleased = ev.button()
return ## Everything below disabled for now..
##self.mouseTrail.append(Point(self.mapToScene(ev.pos())))
#self.emit(QtCore.SIGNAL("mouseReleased(PyQt_PyObject)"), self.mouseTrail)
#if self.currentItem is not None:
#pev = self.graphicsSceneEvent(ev, self.pev, self.fev)
#self.pev = pev
#self.currentItem.mouseReleaseEvent(pev)
#self.currentItem = None
def mouseMoveEvent(self, ev):
#if self.lastMousePos is None:
#self.lastMousePos = Point(ev.pos())
#delta = Point(ev.pos()) - self.lastMousePos
#if abs(delta[0]) > 100 or abs(delta[1]) > 100: ## Weird bug generating extra events..
#return
#self.lastMousePos = Point(ev.pos())
#print "move", delta
QtGui.QGraphicsView.mouseMoveEvent(self, ev)
if not self.mouseEnabled:
return
self.emit(QtCore.SIGNAL("sceneMouseMoved(PyQt_PyObject)"), self.mapToScene(ev.pos()))
#print "moved. Grabber:", self.scene().mouseGrabberItem()
if self.clickAccepted: ## Ignore event if an item in the scene has already claimed it.
return
if ev.buttons() == QtCore.Qt.RightButton:
delta = Point(clip(delta[0], -50, 50), clip(-delta[1], -50, 50))
scale = 1.01 ** delta
#if self.yInverted:
#scale[0] = 1. / scale[0]
self.scale(scale[0], scale[1], center=self.mapToScene(self.mousePressPos))
self.emit(QtCore.SIGNAL('regionChanged(QRectF)'), self.range)
elif ev.buttons() in [QtCore.Qt.MidButton, QtCore.Qt.LeftButton]: ## Allow panning by left or mid button.
tr = -delta / self.currentScale
self.translate(tr[0], tr[1])
self.emit(QtCore.SIGNAL('regionChanged(QRectF)'), self.range)
#return ## Everything below disabled for now..
##self.mouseTrail.append(Point(self.mapToScene(ev.pos())))
#if self.currentItem is not None:
#pev = self.graphicsSceneEvent(ev, self.pev, self.fev)
#self.pev = pev
#self.currentItem.mouseMoveEvent(pev)
def writeSvg(self, fileName=None):
if fileName is None:
fileName = str(QtGui.QFileDialog.getSaveFileName())
self.svg = QtSvg.QSvgGenerator()
self.svg.setFileName(fileName)
self.svg.setSize(self.size())
self.svg.setResolution(600)
painter = QtGui.QPainter(self.svg)
self.render(painter)
def writeImage(self, fileName=None):
if fileName is None:
fileName = str(QtGui.QFileDialog.getSaveFileName())
self.png = QtGui.QImage(self.size(), QtGui.QImage.Format_ARGB32)
painter = QtGui.QPainter(self.png)
rh = self.renderHints()
self.setRenderHints(QtGui.QPainter.Antialiasing)
self.render(painter)
self.setRenderHints(rh)
self.png.save(fileName)
def writePs(self, fileName=None):
if fileName is None:
fileName = str(QtGui.QFileDialog.getSaveFileName())
printer = QtGui.QPrinter(QtGui.QPrinter.HighResolution)
printer.setOutputFileName(fileName)
painter = QtGui.QPainter(printer)
self.render(painter)
painter.end()
def dragEnterEvent(self, ev):
ev.ignore() ## not sure why, but for some reason this class likes to consume drag events
#def getFreehandLine(self):
## Wait for click
#self.clearMouse()
#while self.lastButtonReleased != QtCore.Qt.LeftButton:
#QtGui.qApp.sendPostedEvents()
#QtGui.qApp.processEvents()
#time.sleep(0.01)
#fl = vstack(self.mouseTrail)
#return fl
#def getClick(self):
#fl = self.getFreehandLine()
#return fl[-1]
#class GraphicsSceneMouseEvent(QtGui.QGraphicsSceneMouseEvent):
#"""Stand-in class for QGraphicsSceneMouseEvent"""
#def __init__(self):
#QtGui.QGraphicsSceneMouseEvent.__init__(self)
#def setPos(self, p):
#self.vpos = p
#def setButtons(self, p):
#self.vbuttons = p
#def setButton(self, p):
#self.vbutton = p
#def setModifiers(self, p):
#self.vmodifiers = p
#def setScenePos(self, p):
#self.vscenePos = p
#def setLastPos(self, p):
#self.vlastPos = p
#def setLastScenePos(self, p):
#self.vlastScenePos = p
#def setLastScreenPos(self, p):
#self.vlastScreenPos = p
#def setButtonDownPos(self, p):
#self.vbuttonDownPos = p
#def setButtonDownScenePos(self, p):
#self.vbuttonDownScenePos = p
#def setButtonDownScreenPos(self, p):
#self.vbuttonDownScreenPos = p
#def pos(self):
#return self.vpos
#def buttons(self):
#return self.vbuttons
#def button(self):
#return self.vbutton
#def modifiers(self):
#return self.vmodifiers
#def scenePos(self):
#return self.vscenePos
#def lastPos(self):
#return self.vlastPos
#def lastScenePos(self):
#return self.vlastScenePos
#def lastScreenPos(self):
#return self.vlastScreenPos
#def buttonDownPos(self):
#return self.vbuttonDownPos
#def buttonDownScenePos(self):
#return self.vbuttonDownScenePos
#def buttonDownScreenPos(self):
#return self.vbuttonDownScreenPos