go.py 文件源码

def update(self):
        t1,timeTook=time.time(),0
        if len(self.ear.data) and not self.btnPause.isChecked():
            freqHighCutoff=0
            if self.spinLowpass.value()>0:
                freqHighCutoff=self.spinLowpass.value()
            data=self.ear.getFiltered(freqHighCutoff)
            if self.chkInvert.isChecked():
                data=np.negative(data)
            if self.chkAutoscale.isChecked():
                self.Yscale=np.max(np.abs(data))*1.1
            self.grECG.plotItem.setRange(xRange=[0,self.ear.maxMemorySec],
                            yRange=[-self.Yscale,self.Yscale],padding=0)
            self.grECG.plot(np.arange(len(data))/float(self.ear.rate),data,clear=True,
                            pen=pyqtgraph.mkPen(color='r'),antialias=True)
            self.grECG.plotItem.setTitle(self.lineTitle.text(),color=(0,0,0))
            self.stamp.setPos(0,-self.Yscale)
            self.grECG.plotItem.addItem(self.stamp)
            timeTook=(time.time()-t1)*1000
            print("plotting took %.02f ms"%(timeTook))
        msTillUpdate=int(self.ear.chunk/self.ear.rate*1000)-timeTook
        QtCore.QTimer.singleShot(max(0,msTillUpdate), self.update)