rolling examples

examples/rolling1.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Sun May 12 20:54:18 2019
+
+@author: martindrech
+"""
+# -*- coding: utf-8 -*-
+"""
+Various methods of drawing scrolling plots.
+"""
+
+import pyqtgraph as pg
+from pyqtgraph.Qt import QtCore, QtGui
+import numpy as np
+from PyQt5 import QtGui
+import sys
+
+app = QtGui.QApplication(sys.argv)
+
+win = pg.GraphicsLayoutWidget()
+win.setWindowTitle('pyqtgraph example: Scrolling Plots')
+
+
+# 1) Simplest approach -- update data in the array such that plot appears to scroll
+#    In these examples, the array size is fixed.
+p1 = win.addPlot()
+p2 = win.addPlot()
+#data1 = np.random.normal(size=2000)
+data1 = np.zeros(1000)
+curve1 = p1.plot(data1)
+curve2 = p2.plot(data1)
+ptr1 = 0
+def update1():
+    global data1, ptr1
+    data1 = np.roll(data1, -1)  # shift data in the array one sample left
+    data1[-1] = 5+np.random.rand()                        # (see also: np.roll)
+    curve1.setData(data1)
+    ptr1 += 1
+    curve2.setData(data1)
+    curve2.setPos(ptr1, 0)
+
+def update():
+    update1()
+    
+timer = pg.QtCore.QTimer()
+timer.timeout.connect(update)
+timer.start(50)
+win.show()
+
+## Start Qt event loop unless running in interactive mode or using pyside.
+if __name__ == '__main__':
+    import sys
+    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
+        QtGui.QApplication.instance().exec_()
+

examples/rolling_rois.py

+# -*- coding: utf-8 -*-
+"""
+Various methods of drawing scrolling plots.
+"""
+
+import pyqtgraph as pg
+from pyqtgraph.Qt import QtCore, QtGui
+import numpy as np
+from PyQt5 import QtGui
+import sys
+
+app = QtGui.QApplication(sys.argv)
+
+win = pg.GraphicsLayoutWidget()
+win.setWindowTitle('pyqtgraph example: Scrolling Plots')
+
+
+
+    
+
+# 2) Allow data to accumulate. In these examples, the array doubles in length
+#    whenever it is full. 
+win.nextRow()
+p3 = win.addPlot()
+p4 = win.addPlot()
+# Use automatic downsampling and clipping to reduce the drawing load
+p3.setDownsampling(mode='peak')
+p4.setDownsampling(mode='peak')
+p3.setClipToView(True)
+p4.setClipToView(True)
+p3.setRange(xRange=[-200, 0])
+p3.setLimits(xMax=0)
+curve3 = p3.plot()
+curve4 = p4.plot()
+
+data3 = np.empty(200)
+ptr3 = 0
+
+
+def update1():
+    global data3, ptr3
+    data3[ptr3] = 5*np.sin(ptr3/5)+np.random.normal()
+    ptr3 += 1
+    if ptr3 >= data3.shape[0]:
+        tmp = data3
+        data3 = np.empty(data3.shape[0] * 2)
+        data3[:tmp.shape[0]] = tmp
+    curve3.setData(data3[:ptr3])
+    curve3.setPos(-ptr3, 0)
+    if ptr3 < 100:
+            curve4.setData(data3[:ptr3])
+    else:
+        curve4.setData(data3[ptr3-100:ptr3])
+
+
+timer = pg.QtCore.QTimer()
+timer.timeout.connect(update1)
+timer.start(50)
+
+win.show()
+
+## Start Qt event loop unless running in interactive mode or using pyside.
+if __name__ == '__main__':
+    import sys
+    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
+        QtGui.QApplication.instance().exec_()