""" This demo demonstrates how to draw a dynamic mpl (matplotlib) plot in a wxPython application. It allows "live" plotting as well as manual zooming to specific regions. Both X and Y axes allow "auto" or "manual" settings. For Y, auto mode sets the scaling of the graph to see all the data points. For X, auto mode makes the graph "follow" the data. Set it X min to manual 0 to always see the whole data from the beginning. Note: press Enter in the 'manual' text box to make a new value affect the plot. Eli Bendersky (eliben@gmail.com) License: this code is in the public domain Additional modifications made to allow TI chronos conectivity Last modified: 31.01.2010 """ import os import pprint import random import sys import wx # The recommended way to use wx with mpl is with the WXAgg # backend. # import matplotlib matplotlib.use('WXAgg') from matplotlib.figure import Figure from matplotlib.backends.backend_wxagg import \ FigureCanvasWxAgg as FigCanvas, \ NavigationToolbar2WxAgg as NavigationToolbar import numpy as np import pylab import serial import array def startAccessPoint(): return array.array('B', [0xFF, 0x07, 0x03]).tostring() def accDataRequest(): return array.array('B', [0xFF, 0x08, 0x07, 0x00, 0x00, 0x00, 0x00]).tostring() ser = serial.Serial("/dev/ttyACM1",115200,timeout=1) class DataGen(object): """ A silly class that generates pseudo-random data for display in the plot. """ def __init__(self, init=50): self.data = self.init = init ser.write(startAccessPoint()) def next(self): self._recalc_data() return self.data def _recalc_data(self): #send request for data ser.write(accDataRequest()) #read seven bytes of data accel = ser.read(7) #check they're valid if len(accel) != 7 or (ord(accel[0]) == 0 and ord(accel[1]) == 0 and ord(accel[2]) == 0): print "invalid input" else: #print values to terminal print "x: " + str(ord(accel[2])) + " y: " + str(ord(accel[1])) + " z: " + str(ord(accel[0])) #send one axis to graph print "Datatype: " + str(ord(accel[3])) #currently this code is plotting the x values, this can be changed by #altering the following line self.data=ord(accel[2]) class BoundControlBox(wx.Panel): # A static box with a couple of radio buttons and a text # box. Allows to switch between an automatic mode and a # manual mode with an associated value. def __init__(self, parent, ID, label, initval): wx.Panel.__init__(self, parent, ID) self.value = initval box = wx.StaticBox(self, -1, label) sizer = wx.StaticBoxSizer(box, wx.VERTICAL) self.radio_auto = wx.RadioButton(self, -1, label="Auto", style=wx.RB_GROUP) self.radio_manual = wx.RadioButton(self, -1, label="Manual") self.manual_text = wx.TextCtrl(self, -1, size=(35,-1), value=str(initval), style=wx.TE_PROCESS_ENTER) self.Bind(wx.EVT_UPDATE_UI, self.on_update_manual_text, self.manual_text) self.Bind(wx.EVT_TEXT_ENTER, self.on_text_enter, self.manual_text) manual_box = wx.BoxSizer(wx.HORIZONTAL) manual_box.Add(self.radio_manual, flag=wx.ALIGN_CENTER_VERTICAL) manual_box.Add(self.manual_text, flag=wx.ALIGN_CENTER_VERTICAL) sizer.Add(self.radio_auto, 0, wx.ALL, 10) sizer.Add(manual_box, 0, wx.ALL, 10) self.SetSizer(sizer) sizer.Fit(self) def on_update_manual_text(self, event): self.manual_text.Enable(self.radio_manual.GetValue()) def on_text_enter(self, event): self.value = self.manual_text.GetValue() def is_auto(self): return self.radio_auto.GetValue() def manual_value(self): return self.value class GraphFrame(wx.Frame): """ The main frame of the application """ title = 'Demo: dynamic matplotlib graph' def __init__(self): wx.Frame.__init__(self, None, -1, self.title) self.datagen = DataGen() self.data = [self.datagen.next()] self.paused = False self.create_menu() self.create_status_bar() self.create_main_panel() self.redraw_timer = wx.Timer(self) self.Bind(wx.EVT_TIMER, self.on_redraw_timer, self.redraw_timer) #Adjust graph refresh rate self.redraw_timer.Start(10) def create_menu(self): self.menubar = wx.MenuBar() menu_file = wx.Menu() m_expt = menu_file.Append(-1, "&Save plot\tCtrl-S", "Save plot to file") self.Bind(wx.EVT_MENU, self.on_save_plot, m_expt) menu_file.AppendSeparator() m_exit = menu_file.Append(-1, "E&xit\tCtrl-X", "Exit") self.Bind(wx.EVT_MENU, self.on_exit, m_exit) self.menubar.Append(menu_file, "&File") self.SetMenuBar(self.menubar) def create_main_panel(self): self.panel = wx.Panel(self) self.init_plot() self.canvas = FigCanvas(self.panel, -1, self.fig) self.xmin_control = BoundControlBox(self.panel, -1, "X min", 0) self.xmax_control = BoundControlBox(self.panel, -1, "X max", 50) self.ymin_control = BoundControlBox(self.panel, -1, "Y min", 0) self.ymax_control = BoundControlBox(self.panel, -1, "Y max", 100) self.pause_button = wx.Button(self.panel, -1, "Pause") self.Bind(wx.EVT_BUTTON, self.on_pause_button, self.pause_button) self.Bind(wx.EVT_UPDATE_UI, self.on_update_pause_button, self.pause_button) self.cb_grid = wx.CheckBox(self.panel, -1, "Show Grid", style=wx.ALIGN_RIGHT) self.Bind(wx.EVT_CHECKBOX, self.on_cb_grid, self.cb_grid) self.cb_grid.SetValue(True) self.cb_xlab = wx.CheckBox(self.panel, -1, "Show X labels", style=wx.ALIGN_RIGHT) self.Bind(wx.EVT_CHECKBOX, self.on_cb_xlab, self.cb_xlab) self.cb_xlab.SetValue(True) self.hbox1 = wx.BoxSizer(wx.HORIZONTAL) self.hbox1.Add(self.pause_button, border=5, flag=wx.ALL | wx.ALIGN_CENTER_VERTICAL) self.hbox1.AddSpacer(20) self.hbox1.Add(self.cb_grid, border=5, flag=wx.ALL | wx.ALIGN_CENTER_VERTICAL) self.hbox1.AddSpacer(10) self.hbox1.Add(self.cb_xlab, border=5, flag=wx.ALL | wx.ALIGN_CENTER_VERTICAL) self.hbox2 = wx.BoxSizer(wx.HORIZONTAL) self.hbox2.Add(self.xmin_control, border=5, flag=wx.ALL) self.hbox2.Add(self.xmax_control, border=5, flag=wx.ALL) self.hbox2.AddSpacer(24) self.hbox2.Add(self.ymin_control, border=5, flag=wx.ALL) self.hbox2.Add(self.ymax_control, border=5, flag=wx.ALL) self.vbox = wx.BoxSizer(wx.VERTICAL) self.vbox.Add(self.canvas, 1, flag=wx.LEFT | wx.TOP | wx.GROW) self.vbox.Add(self.hbox1, 0, flag=wx.ALIGN_LEFT | wx.TOP) self.vbox.Add(self.hbox2, 0, flag=wx.ALIGN_LEFT | wx.TOP) self.panel.SetSizer(self.vbox) self.vbox.Fit(self) def create_status_bar(self): self.statusbar = self.CreateStatusBar() def init_plot(self): self.dpi = 100 self.fig = Figure((3.0, 3.0), dpi=self.dpi) self.axes = self.fig.add_subplot(111) self.axes.set_axis_bgcolor('black') self.axes.set_title('Chronos Sensor Data', size=12) pylab.setp(self.axes.get_xticklabels(), fontsize=8) pylab.setp(self.axes.get_yticklabels(), fontsize=8) # plot the data as a line series, and save the reference # to the plotted line series # self.plot_data = self.axes.plot( self.data, linewidth=1, color=(1, 1, 0), )[0] def draw_plot(self): """ Redraws the plot """ # when xmin is on auto, it "follows" xmax to produce a # sliding window effect. therefore, xmin is assigned after # xmax. # if self.xmax_control.is_auto(): xmax = len(self.data) if len(self.data) > 50 else 50 else: xmax = int(self.xmax_control.manual_value()) if self.xmin_control.is_auto(): xmin = xmax - 50 else: xmin = int(self.xmin_control.manual_value()) # for ymin and ymax, find the minimal and maximal values # in the data set and add a mininal margin. # # note that it's easy to change this scheme to the # minimal/maximal value in the current display, and not # the whole data set. # if self.ymin_control.is_auto(): ymin = round(min(self.data), 0) - 1 else: ymin = int(self.ymin_control.manual_value()) if self.ymax_control.is_auto(): ymax = round(max(self.data), 0) + 1 else: ymax = int(self.ymax_control.manual_value()) self.axes.set_xbound(lower=xmin, upper=xmax) self.axes.set_ybound(lower=ymin, upper=ymax) # anecdote: axes.grid assumes b=True if any other flag is # given even if b is set to False. # so just passing the flag into the first statement won't # work. # if self.cb_grid.IsChecked(): self.axes.grid(True, color='gray') else: self.axes.grid(False) # Using setp here is convenient, because get_xticklabels # returns a list over which one needs to explicitly # iterate, and setp already handles this. # pylab.setp(self.axes.get_xticklabels(), visible=self.cb_xlab.IsChecked()) self.plot_data.set_xdata(np.arange(len(self.data))) self.plot_data.set_ydata(np.array(self.data)) self.canvas.draw() def on_pause_button(self, event): self.paused = not self.paused def on_update_pause_button(self, event): label = "Resume" if self.paused else "Pause" self.pause_button.SetLabel(label) def on_cb_grid(self, event): self.draw_plot() def on_cb_xlab(self, event): self.draw_plot() def on_save_plot(self, event): file_choices = "PNG (*.png)|*.png" dlg = wx.FileDialog( self, message="Save plot as...", defaultDir=os.getcwd(), defaultFile="plot.png", wildcard=file_choices, style=wx.SAVE) if dlg.ShowModal() == wx.ID_OK: path = dlg.GetPath() self.canvas.print_figure(path, dpi=self.dpi) self.flash_status_message("Saved to %s" % path) def on_redraw_timer(self, event): # if paused do not add data, but still redraw the plot # (to respond to scale modifications, grid change, etc.) # if not self.paused: self.data.append(self.datagen.next()) self.draw_plot() def on_exit(self, event): self.Destroy() def flash_status_message(self, msg, flash_len_ms=1500): self.statusbar.SetStatusText(msg) self.timeroff = wx.Timer(self) self.Bind( wx.EVT_TIMER, self.on_flash_status_off, self.timeroff) self.timeroff.Start(flash_len_ms, oneShot=True) def on_flash_status_off(self, event): self.statusbar.SetStatusText('') if __name__ == '__main__': app = wx.PySimpleApp() app.frame = GraphFrame() app.frame.Show() app.MainLoop()