from pyqtgraph.Qt import QtGui, QtCore from scipy.fftpack import fft import numpy as np import scipy.stats from GraphicsObject import GraphicsObject import pyqtgraph.functions as fn from pyqtgraph import debug from pyqtgraph.Point import Point import struct __all__ = ['PlotCurveItem'] class PlotCurveItem(GraphicsObject): """ Class representing a single plot curve. Instances of this class are created automatically as part of PlotDataItem; these rarely need to be instantiated directly. Features: - Fast data update - FFT display mode (accessed via PlotItem context menu) - Fill under curve - Mouse interaction ==================== =============================================== **Signals:** sigPlotChanged(self) Emitted when the data being plotted has changed sigClicked(self) Emitted when the curve is clicked ==================== =============================================== """ sigPlotChanged = QtCore.Signal(object) sigClicked = QtCore.Signal(object) def __init__(self, *args, **kargs): """ Forwards all arguments to :func:`setData `. Some extra arguments are accepted as well: ============== ======================================================= **Arguments:** parent The parent GraphicsObject (optional) clickable If True, the item will emit sigClicked when it is clicked on. Defaults to False. ============== ======================================================= """ GraphicsObject.__init__(self, kargs.get('parent', None)) self.clear() self.path = None self.fillPath = None self.exportOpts = False self.antialias = False ## this is disastrous for performance. #self.setCacheMode(QtGui.QGraphicsItem.DeviceCoordinateCache) self.metaData = {} self.opts = { 'pen': fn.mkPen('w'), 'shadowPen': None, 'fillLevel': None, 'brush': None, } self.setClickable(kargs.get('clickable', False)) self.setData(*args, **kargs) def implements(self, interface=None): ints = ['plotData'] if interface is None: return ints return interface in ints def setClickable(self, s): """Sets whether the item responds to mouse clicks.""" self.clickable = s def getData(self): return self.xData, self.yData def dataBounds(self, ax, frac=1.0): (x, y) = self.getData() if x is None or len(x) == 0: return (0, 0) if ax == 0: d = x elif ax == 1: d = y if frac >= 1.0: return (d.min(), d.max()) elif frac <= 0.0: raise Exception("Value for parameter 'frac' must be > 0. (got %s)" % str(frac)) else: return (scipy.stats.scoreatpercentile(d, 50 - (frac * 50)), scipy.stats.scoreatpercentile(d, 50 + (frac * 50))) def setPen(self, *args, **kargs): """Set the pen used to draw the curve.""" self.opts['pen'] = fn.mkPen(*args, **kargs) self.update() def setShadowPen(self, *args, **kargs): """Set the shadow pen used to draw behind tyhe primary pen. This pen must have a larger width than the primary pen to be visible. """ self.opts['shadowPen'] = fn.mkPen(*args, **kargs) self.update() def setBrush(self, *args, **kargs): """Set the brush used when filling the area under the curve""" self.opts['brush'] = fn.mkBrush(*args, **kargs) self.update() def setFillLevel(self, level): """Set the level filled to when filling under the curve""" self.opts['fillLevel'] = level self.fillPath = None self.update() #def setColor(self, color): #self.pen.setColor(color) #self.update() #def setAlpha(self, alpha, auto): #self.opts['alphaHint'] = alpha #self.opts['alphaMode'] = auto #self.update() #def setSpectrumMode(self, mode): #self.opts['spectrumMode'] = mode #self.xDisp = self.yDisp = None #self.path = None #self.update() #def setLogMode(self, mode): #self.opts['logMode'] = mode #self.xDisp = self.yDisp = None #self.path = None #self.update() #def setPointMode(self, mode): #self.opts['pointMode'] = mode #self.update() #def setDownsampling(self, ds): #if self.opts['downsample'] != ds: #self.opts['downsample'] = ds #self.xDisp = self.yDisp = None #self.path = None #self.update() def setData(self, *args, **kargs): """ ============== ======================================================= **Arguments:** x, y (numpy arrays) Data to show pen Pen to use when drawing. Any single argument accepted by :func:`mkPen ` is allowed. shadowPen Pen for drawing behind the primary pen. Usually this is used to emphasize the curve by providing a high-contrast border. Any single argument accepted by :func:`mkPen ` is allowed. fillLevel (float or None) Fill the area 'under' the curve to *fillLevel* brush QBrush to use when filling. Any single argument accepted by :func:`mkBrush ` is allowed. ============== ======================================================= If non-keyword arguments are used, they will be interpreted as setData(y) for a single argument and setData(x, y) for two arguments. """ self.updateData(*args, **kargs) def updateData(self, *args, **kargs): prof = debug.Profiler('PlotCurveItem.updateData', disabled=True) if len(args) == 1: kargs['y'] = args[0] elif len(args) == 2: kargs['x'] = args[0] kargs['y'] = args[1] if 'y' not in kargs or kargs['y'] is None: kargs['y'] = np.array([]) if 'x' not in kargs or kargs['x'] is None: kargs['x'] = np.arange(len(kargs['y'])) for k in ['x', 'y']: data = kargs[k] if isinstance(data, list): data = np.array(data) kargs[k] = data if not isinstance(data, np.ndarray) or data.ndim > 1: raise Exception("Plot data must be 1D ndarray.") if 'complex' in str(data.dtype): raise Exception("Can not plot complex data types.") prof.mark("data checks") #self.setCacheMode(QtGui.QGraphicsItem.NoCache) ## Disabling and re-enabling the cache works around a bug in Qt 4.6 causing the cached results to display incorrectly ## Test this bug with test_PlotWidget and zoom in on the animated plot self.prepareGeometryChange() self.yData = kargs['y'].view(np.ndarray) self.xData = kargs['x'].view(np.ndarray) prof.mark('copy') if self.xData.shape != self.yData.shape: raise Exception("X and Y arrays must be the same shape--got %s and %s." % (str(x.shape), str(y.shape))) self.path = None self.fillPath = None #self.xDisp = self.yDisp = None if 'pen' in kargs: self.setPen(kargs['pen']) if 'shadowPen' in kargs: self.setShadowPen(kargs['shadowPen']) if 'fillLevel' in kargs: self.setFillLevel(kargs['fillLevel']) if 'brush' in kargs: self.setBrush(kargs['brush']) prof.mark('set') self.update() prof.mark('update') self.sigPlotChanged.emit(self) prof.mark('emit') prof.finish() def generatePath(self, x, y): prof = debug.Profiler('PlotCurveItem.generatePath', disabled=True) path = QtGui.QPainterPath() ## Create all vertices in path. The method used below creates a binary format so that all ## vertices can be read in at once. This binary format may change in future versions of Qt, ## so the original (slower) method is left here for emergencies: #path.moveTo(x[0], y[0]) #for i in range(1, y.shape[0]): # path.lineTo(x[i], y[i]) ## Speed this up using >> operator ## Format is: ## numVerts(i4) 0(i4) ## x(f8) y(f8) 0(i4) <-- 0 means this vertex does not connect ## x(f8) y(f8) 1(i4) <-- 1 means this vertex connects to the previous vertex ## ... ## 0(i4) ## ## All values are big endian--pack using struct.pack('>d') or struct.pack('>i') n = x.shape[0] # create empty array, pad with extra space on either end arr = np.empty(n+2, dtype=[('x', '>f8'), ('y', '>f8'), ('c', '>i4')]) # write first two integers prof.mark('allocate empty') arr.data[12:20] = struct.pack('>ii', n, 0) prof.mark('pack header') # Fill array with vertex values arr[1:-1]['x'] = x arr[1:-1]['y'] = y arr[1:-1]['c'] = 1 prof.mark('fill array') # write last 0 lastInd = 20*(n+1) arr.data[lastInd:lastInd+4] = struct.pack('>i', 0) prof.mark('footer') # create datastream object and stream into path buf = QtCore.QByteArray(arr.data[12:lastInd+4]) # I think one unnecessary copy happens here prof.mark('create buffer') ds = QtCore.QDataStream(buf) prof.mark('create datastream') ds >> path prof.mark('load') prof.finish() return path def shape(self): if self.path is None: try: self.path = self.generatePath(*self.getData()) except: return QtGui.QPainterPath() return self.path def boundingRect(self): (x, y) = self.getData() if x is None or y is None or len(x) == 0 or len(y) == 0: return QtCore.QRectF() if self.opts['shadowPen'] is not None: lineWidth = (max(self.opts['pen'].width(), self.opts['shadowPen'].width()) + 1) else: lineWidth = (self.opts['pen'].width()+1) pixels = self.pixelVectors() if pixels is None: pixels = [Point(0,0), Point(0,0)] xmin = x.min() - pixels[0].x() * lineWidth xmax = x.max() + pixels[0].x() * lineWidth ymin = y.min() - abs(pixels[1].y()) * lineWidth ymax = y.max() + abs(pixels[1].y()) * lineWidth return QtCore.QRectF(xmin, ymin, xmax-xmin, ymax-ymin) def paint(self, p, opt, widget): prof = debug.Profiler('PlotCurveItem.paint '+str(id(self)), disabled=True) if self.xData is None: return #if self.opts['spectrumMode']: #if self.specPath is None: #self.specPath = self.generatePath(*self.getData()) #path = self.specPath #else: x = None y = None if self.path is None: x,y = self.getData() if x is None or len(x) == 0 or y is None or len(y) == 0: return self.path = self.generatePath(x,y) self.fillPath = None path = self.path prof.mark('generate path') if self.opts['brush'] is not None and self.opts['fillLevel'] is not None: if self.fillPath is None: if x is None: x,y = self.getData() p2 = QtGui.QPainterPath(self.path) p2.lineTo(x[-1], self.opts['fillLevel']) p2.lineTo(x[0], self.opts['fillLevel']) p2.lineTo(x[0], y[0]) p2.closeSubpath() self.fillPath = p2 prof.mark('generate fill path') p.fillPath(self.fillPath, self.opts['brush']) prof.mark('draw fill path') ## Copy pens and apply alpha adjustment sp = QtGui.QPen(self.opts['shadowPen']) cp = QtGui.QPen(self.opts['pen']) #for pen in [sp, cp]: #if pen is None: #continue #c = pen.color() #c.setAlpha(c.alpha() * self.opts['alphaHint']) #pen.setColor(c) ##pen.setCosmetic(True) if self.exportOpts is not False: aa = self.exportOpts['antialias'] else: aa = self.antialias p.setRenderHint(p.Antialiasing, aa) if sp is not None: p.setPen(sp) p.drawPath(path) p.setPen(cp) p.drawPath(path) prof.mark('drawPath') #print "Render hints:", int(p.renderHints()) prof.finish() #p.setPen(QtGui.QPen(QtGui.QColor(255,0,0))) #p.drawRect(self.boundingRect()) def clear(self): self.xData = None ## raw values self.yData = None self.xDisp = None ## display values (after log / fft) self.yDisp = None self.path = None #del self.xData, self.yData, self.xDisp, self.yDisp, self.path #def mousePressEvent(self, ev): ##GraphicsObject.mousePressEvent(self, ev) #if not self.clickable: #ev.ignore() #if ev.button() != QtCore.Qt.LeftButton: #ev.ignore() #self.mousePressPos = ev.pos() #self.mouseMoved = False #def mouseMoveEvent(self, ev): ##GraphicsObject.mouseMoveEvent(self, ev) #self.mouseMoved = True ##print "move" #def mouseReleaseEvent(self, ev): ##GraphicsObject.mouseReleaseEvent(self, ev) #if not self.mouseMoved: #self.sigClicked.emit(self) def mouseClickEvent(self, ev): if not self.clickable or ev.button() != QtCore.Qt.LeftButton: return ev.accept() self.sigClicked.emit(self) def setExportMode(self, export, opts): if export: self.exportOpts = opts if 'antialias' not in opts: self.exportOpts['antialias'] = True else: self.exportOpts = False class ROIPlotItem(PlotCurveItem): """Plot curve that monitors an ROI and image for changes to automatically replot.""" def __init__(self, roi, data, img, axes=(0,1), xVals=None, color=None): self.roi = roi self.roiData = data self.roiImg = img self.axes = axes self.xVals = xVals PlotCurveItem.__init__(self, self.getRoiData(), x=self.xVals, color=color) #roi.connect(roi, QtCore.SIGNAL('regionChanged'), self.roiChangedEvent) roi.sigRegionChanged.connect(self.roiChangedEvent) #self.roiChangedEvent() def getRoiData(self): d = self.roi.getArrayRegion(self.roiData, self.roiImg, axes=self.axes) if d is None: return while d.ndim > 1: d = d.mean(axis=1) return d def roiChangedEvent(self): d = self.getRoiData() self.updateData(d, self.xVals)