cfgWindow.py

'''
ConfigFrame is a class that gets packed into the root window. Takes config
settings from the user and passes them into the approrpate functions when the
Go button is pressed
'''
import sys
if sys.version_info[0] < 3:
    #If we're executing with Python 2
    import Tkinter as tk
    import tkMessageBox as messagebox
    import ttk
    import tkFileDialog as filedialog
    import tkColorChooser as colorchooser
else:
    #Otherwise we're using Python 3
    import tkinter as tk
    from tkinter import messagebox
    from tkinter import ttk
    from tkinter import filedialog
    from tkinter import colorchooser

from graphWindow import *  
import serial.tools.list_ports  
import pprint
from defaults import defaults
import os

class ConfigFrame(ttk.Frame):
    """
    Main application Frame. Houses all the individual objects (classes) that
    make up the application
    """
    def __init__(self, parent):
        ttk.Frame.__init__(self, parent)
        self.parent = parent
        self['padding'] = '4'
        
        self.TKvariables = {}
        
        #Read in the defaults
        for key in defaults:
            
            if key[0:5] == 'graph' or key.find('ylims') >= 0:
                self.TKvariables.update({key:[]})
                
                for val in range(len(defaults[key])):
                    self.TKvariables[key].append(tk.StringVar(value=defaults[key][val]))
                    
            else:
                self.TKvariables.update({key:tk.StringVar(value=defaults[key])})      
        
        num_vars = int(self.TKvariables['datalength'].get())
        self.datalist = list(range(1,num_vars+1))
        
        #Create a combobox containing the available COM ports        
        comlst = self.get_comlst()
        self.COMbox = ttk.Labelframe(self, text='COM port to source data from')
        self.COMcombo = ttk.Combobox(self.COMbox,  width=60, values=comlst, \
            state='readonly', textvariable=self.TKvariables['COMport'],\
            postcommand=self.updateCOMbox )
        self.COMbox.grid(row = 0, column = 0, columnspan = 5)
        self.COMcombo.grid()
        
        #Create an "about" text box
        ABOUTframe = ttk.LabelFrame(self, text = 'What it does')
        ABOUTlabel = ttk.Label(ABOUTframe, text= \
            'Graphs data coming in over the serial port in a comma '
            'seperated variable string. Hover over each option to get ' 
            'a description of what the setting does', wraplength = 140)
        ABOUTframe.grid(row=1, column = 0, rowspan = 2, columnspan = 2, \
            sticky = 'nw, se', padx= 3, pady = 5)
        CreateToolTip(ABOUTlabel,\
        "The default values can be changed by opening defaults.py with a text "
        "editor and changing the values")
        ABOUTlabel.pack()        
        
        #Create a Graph! and About buttons
        GObut = ttk.Button(self, text='Go!', command=self.goButton)
        GObut.grid(row=6, column = 0, sticky = 'we')
        ABOUTbut = ttk.Button(self, text='About', command=self.aboutButton) 
        ABOUTbut.grid(row = 6, column = 1, sticky = 'we')
        
        #Create an instance of the class for the config panel
        notebook = ConfigNotebook(self, self)
        
        #Update the state of the graphs based on the defaults and grid
        notebook.updateGraphs()     
        notebook.grid(row=1, column=3, columnspan=2, rowspan=6, sticky = 'nsew', \
                padx = 5, pady = 5)
        
        #Bind the enter key to start the program
        self.parent.bind("<Return>", lambda event:self.goButton())
                
    def getfilename(self):
        if self.TKvariables['log2file'].get() == 'on':
            #Only pop up with the dialog when the box is checked
            options = {}
            options['filetypes'] = [('Comma Seperated Variable', '.csv')]
            options['initialfile'] = 'GraphLog.csv'
            self.TKvariables['filename'].set(filedialog.asksaveasfilename(**options))             
            
    def goButton(self):
        self.parent.variables = {}

        for key in self.TKvariables:
            if key[0:5] == 'graph' or key.find('ylims') >= 0:
                self.parent.variables.update({key:[]})
                for val in range(len(self.TKvariables[key])):
                    self.parent.variables[key].append(self.TKvariables[key][val].get())
            else:
                self.parent.variables.update({key:self.TKvariables[key].get()})
        
        if self.parent.variables['COMport'] == '':
            messagebox.showerror(message='Select a COM port!')
        else:
            try:
                #Try to open the COM port first to make sure it's available                
                if os.name == 'nt':
                    s = serial.Serial(port=self.parent.variables['COMport'][0:4])
                else:
                    first_space = self.parent.variables['COMport'].index(' ')
                    # Parameters necessary due to https://github.com/pyserial/pyserial/issues/59
                    s = serial.Serial(port=self.parent.variables['COMport'][0:first_space], rtscts=True, dsrdtr=True)
                s.close()            
                GraphTopLevel(self.parent)
            except Exception as e:
                #Otherwise the port isn't available, so error out
                messagebox.showerror(message=('COM port not available: ', e))
    
    def aboutButton(self):
        toplvl = tk.Toplevel()
        toplvl.title('About')
      
        txt = ttk.Label(toplvl, wraplength=450, text= \
        "This program was written by Victor Zaccardo as a way to familiarize "
        "myself with Python, and also so I don't have to try and read a serial"
        " terminal every time I want to visualize data coming out of a "
        "microcontroller. It's written in Python 2.7, using tkinter, "
        "matplotlib, and pyserial. \n \n I hope it can be helpful with your "
        "embedded projects. If you have any questions or comments, feel free "
        "to contact me at victorzaccardo@gmail.com. Happy plotting!")
        txt.grid(row=0, column=0, padx=5, pady=5)
        
        closeButton = ttk.Button(toplvl, text='Close', command=toplvl.destroy)
        closeButton.grid(row=1, column=0, pady = 3)
        
        toplvl.update()
        scrwidth = toplvl.winfo_screenwidth()
        scrheight = toplvl.winfo_screenheight()
        winwidth = toplvl.winfo_reqwidth()
        winheight = toplvl.winfo_reqheight()
        winposx = int(round(scrwidth/2 - winwidth/2))
        winposy = int(round(scrheight/2 - winheight/2))
        toplvl.geometry('{}x{}+{}+{}'.format(winwidth, winheight, winposx, winposy))  
        
    def get_comlst(self):  
        """Returns a list of available COM ports with description"""
        comports = serial.tools.list_ports.comports()
        comlst = []    
        
        for item in comports:
            name = item[0]
            
            if len(item[1]) > 50:
                description = item[1][0:44] + "..."
            else:
                description = item[1]
                
            comlst.append(str(name + " - " + description))
        
        return sorted(comlst)
        
    def updateCOMbox(self):
        self.COMcombo['values'] = self.get_comlst()
        
class ConfigNotebook(ttk.Notebook):
    """
    A notebook that houses all the configuration for the program. Calls classes
    that configure each tab individually and places them in the notebook.
    Note on the controller - it's the top level of the application (an instance
    of MainApplication). It will have a dictionary that houses all the
    TKvariables, makes accessing them easier.
    """
    def __init__(self, parent, controller):
        
        ttk.Notebook.__init__(self, parent)
        self.controller = controller

        datalist = list(range(1,7))
        datalist.insert(0,'-')
        
        #Create the pages
        serialcfgframe = SerialTab(self, self.controller)
        datacfgframe = DataTab(self, self.controller)
        graph1frame = GraphTab(self, self.controller, 1)
        graph2frame = GraphTab(self, self.controller, 2)
        graph3frame = GraphTab(self, self.controller, 3)
            
        #Add them to the notebook
        self.add(datacfgframe, text='Data')            
        self.add(serialcfgframe, text='Serial')
        self.add(graph1frame, text='Graph 1')
        self.add(graph2frame, text='Graph 2')
        self.add(graph3frame, text='Graph 3')
        
    def updateGraphs(self, *args, **kwargs):
        num_graphs = int(self.controller.TKvariables['numgraphs'].get())
        
        #First, disable all the graphs
        for i in range(2, 5):
            self.tab(i, state='disabled')
        
        #Now, re-enable based on how many graphs are selected
        if num_graphs >= 1:
            self.tab(2, state='normal')
        if num_graphs >= 2:
            self.tab(3, state='normal')
        if num_graphs >= 3:
            self.tab(4, state='normal')


class SerialTab(ttk.Frame):
    def __init__(self, parent, controller):
        ttk.Frame.__init__(self, parent)
        self.controller = controller
        self['padding'] = [0, 7, 0, 0]
        
        #Populate the serial configuration tab        
        self.baudlist = (4800, 9600, 19200, 38400, 57600, 115200, 230400, 921600)
        self.databitslist = (7, 8)
        self.stopbitslist = (1, 2)
        self.paritylist = ('None', 'Even', 'Odd', 'Mark', 'Space')
        
        baudlabel = ttk.Label(self, text='Baudrate')
        baudbox = ttk.Combobox(self, width=8, values=self.baudlist, 
                        textvariable=self.controller.TKvariables['baud'])
        datalabel = ttk.Label(self, text='Data bits')
        databox = ttk.Combobox(self, width=8, values = self.databitslist, \
                        textvariable=self.controller.TKvariables['databits'])            
        stopbitslabel = ttk.Label(self, text='Stop bits')
        stopbitsbox = ttk.Combobox(self, width=8, values=self.stopbitslist, \
                        textvariable=self.controller.TKvariables['stopbits'])          
        paritylabel = ttk.Label(self, text='Parity')
        paritybox = ttk.Combobox(self, width=8, values=self.paritylist, \
                        textvariable=self.controller.TKvariables['parity'])
        
        #ttk.Label(self, text='            ').grid(row=1, column=0)                
        baudlabel.grid(row=1, column = 1, padx=5)
        baudbox.grid(row=1, column=2, padx=5)
        datalabel.grid(row=2, column = 1, padx=5)
        databox.grid(row=2, column=2,  padx=5)
        stopbitslabel.grid(row=3, column = 1,  padx=5)
        stopbitsbox.grid(row=3, column=2,  padx=5)
        paritylabel.grid(row=4, column = 1,  padx=5)
        paritybox.grid(row=4, column=2,  padx=5)


class DataTab(ttk.Frame):
    """
    Houses configuration for the incoming data
    """
    def __init__(self, parent, controller):
        
        ttk.Frame.__init__(self, parent)
        self['padding'] = 4   
        self.parent = parent
        self.controller = controller
        
        self.datalist = list(range(1,11))       
        self.terminatorlist = ['\\n', ';', '\\n;']  
        self.numgraphslist = list(range(1,4))
        
        #How long is the data coming in?
        datalabel = ttk.Label(self, text='Variables per line')
        databox = ttk.Combobox(self, width=8, values = self.datalist, \
                        textvariable=self.controller.TKvariables['datalength'])
        CreateToolTip(datalabel,\
        "The numbder of variables per line. "
        "A line is a series of variables seperated by a comma, and terminated by a \\n character. "
        "For example, the line: data1, data2, data3\\n would have 3 variables. "
        "All data recieved must be a string, no binary numbers allowed")
        
        maxlabel = ttk.Label(self, text='Max Message Length')
        maxbox = ttk.Entry(self, width=11, \
            textvariable=self.controller.TKvariables['maxlength'])
        CreateToolTip(maxlabel, \
        'The maximum length of one line (in characters). If anything '
        'be conservative with this number, err on the high side. The program reads '
        'lines from the serial buffer until it is below this number of characters, to avoid '
        'a condition where it tries to read a line out of the serial buffer and a \\n '
        "can't be found"
        )
        
        numgraphslabel = ttk.Label(self, text='Number of graphs')
        numgraphsbox = ttk.Combobox(self, width=8, values=self.numgraphslist, \
            textvariable=self.controller.TKvariables['numgraphs'])
        numgraphsbox.bind('<<ComboboxSelected>>', self.parent.updateGraphs)
        CreateToolTip(numgraphslabel,\
        "The number of graphs to plot data on")
        
        maxcheck = ttk.Checkbutton(self, text='Start Maximized?', \
        variable=self.controller.TKvariables['startmax'], \
            onvalue='yes', offvalue='no')
        CreateToolTip(maxcheck, \
        "When the graph is started, the window will be maximized.")
            
        log2filecheck = ttk.Checkbutton(self, text='Log to file?',\
            variable=self.controller.TKvariables['log2file'], onvalue='on', \
            offvalue='off', command=self.controller.getfilename)
        CreateToolTip(log2filecheck, \
        "If checked, all data recieved will also be logged to a CSV file")
        
        AObutton = ttk.Button(self, text='Advanced Options', command=self.AObutton)
                                    
        datalabel.grid(row=1, column = 1, sticky='w')
        databox.grid(row=1, column = 2, sticky='w', padx=7)
        maxlabel.grid(row=2, column=1, sticky='w')
        maxbox.grid(row=2, column=2, sticky='w', padx=7)
        numgraphslabel.grid(row=3, column=1, sticky='w')
        numgraphsbox.grid(row=3, column=2, sticky='w', padx=7)
        maxcheck.grid(row=4, column=1, columnspan=2, sticky='w')
        log2filecheck.grid(row=5, column=1, columnspan=2, sticky='w')
        AObutton.grid(row=6, column=1, columnspan=2, sticky='ew')
        
    def AObutton(self):
        toplvl = tk.Toplevel()
        toplvl.withdraw()
        frame = ttk.Frame(toplvl, padding=[4, 4, 4, 4])
        boxwidth = 8
        boxpadx = 5
        TKvars = self.controller.TKvariables
        
        #Data Depth
        datalabel = ttk.Label(frame, text='Data History Depth')
        databox = ttk.Entry(frame, width=boxwidth, textvariable=TKvars['datadepth'])
        datapostlbl = ttk.Label(frame, text='Lines')
        datalabel.grid(row=0, column=0, sticky='e')
        databox.grid(row=0, column=1, sticky='ew', padx=boxpadx)
        datapostlbl.grid(row=0, column=2, sticky='w')         
        CreateToolTip(datalabel, \
        'How many lines of data to plot on the x axis. More = longer history '
        'displayed on the screen')

        #Refresh Frequency
        refreshlabel = ttk.Label(frame, text='Refresh Frequency')
        refreshbox = ttk.Entry(frame, width=boxwidth, textvariable=TKvars['refreshfreq'])
        refreshpostlbl = ttk.Label(frame, text='Hz')
        refreshlabel.grid(row=1, column=0, sticky='e')
        refreshbox.grid(row=1, column=1, sticky='ew', padx=boxpadx)
        refreshpostlbl.grid(row=1, column=2, sticky='w')   
        CreateToolTip(refreshlabel, \
        'How often to redraw the screen. Any value higher than what your PC '
        'can do will just max out the process. A reasonable value to start '
        'with is 20')

        #Data Width
        widthlabel = ttk.Label(frame, text='Statusbar Data Width')
        widthbox = ttk.Entry(frame, width=boxwidth, textvariable=TKvars['stsbrwdth'])
        widthpostlbl = ttk.Label(frame, text='Chars')
        widthlabel.grid(row=2, column=0, sticky='e')
        widthbox.grid(row=2, column=1, sticky='ew', padx=boxpadx)
        widthpostlbl.grid(row=2, column=2, sticky='w')   
        CreateToolTip(widthlabel, \
        'This is for keeping the "last line recieved" value in the statusbar'
        'a constant width. If you find that the statusbar is jumping around, '
        'increase this value')

        #Set as defaults
        defaultbutton = ttk.Button(frame, text='Set selections as defaults', \
            command=self.setDefaults)
        defaultbutton.grid(row=3, column=0, columnspan=1, pady=1, sticky='ww')
        CreateToolTip(defaultbutton, \
        'Set ALL the current settings as the defaults')
        
        #OK button
        OKbutton = ttk.Button(frame, text='OK', width=10, command=toplvl.destroy)
        OKbutton.grid(row=3, column=1, columnspan=2, pady=1, sticky='e')
        
        frame.grid()
        toplvl.update()
        scrwidth = toplvl.winfo_screenwidth()
        scrheight = toplvl.winfo_screenheight()
        winwidth = toplvl.winfo_reqwidth()
        winheight = toplvl.winfo_reqheight()
        winposx = int(round(scrwidth/2 - winwidth/2))
        winposy = int(round(scrheight/2 - winheight/2))
        toplvl.geometry('{}x{}+{}+{}'.format(winwidth, winheight, winposx, winposy))
        toplvl.deiconify()        
        
    def setDefaults(self):
        defaultstmp = {}
        TKvars = self.controller.TKvariables

        for key in TKvars:
            if key[0:5] == 'graph' or key.find('ylims') >= 0:
                defaultstmp.update({key:[]})
                for val in range(len(TKvars[key])):
                    try:
                        defaultstmp[key].append(int(TKvars[key][val].get()))
                    except:
                        defaultstmp[key].append(TKvars[key][val].get())
                        
            elif key == 'filename':
                #There is a bug with pprint that puts a u in front of the
                #filename, so convert it to a string first
                defaultstmp.update({key:str(TKvars[key].get())})                   
            else:
                try:
                    defaultstmp.update({key:int(TKvars[key].get())}) 
                except:    
                    defaultstmp.update({key:TKvars[key].get()})   
        
        fileobj = open('defaults.py', 'w')
        header = \
        "'''\n" \
        "Be careful when modifying these values - if they aren't set correctly, \n" \
        "the program won't run. As a precaution if you modify it, it's a good idea to \n" \
        "save a copy first. serialplot just looks for a file in the same directory \n" \
        "called 'defaults.py'\n \n" \
        "The format for graphXlineX properties is:\n"\
        "[datalabel,\ndatapos,\nlinecolor,\ndashed,\nmultiplier,\noffset]\n"\
        "'''\n\n"

        fileobj.write(header)
        fileobj.write('defaults = ' + pprint.pformat(defaultstmp) + '\n')
        fileobj.close()
        
        
class GraphTab(ttk.Frame):
    def __init__(self, parent, controller, graphnum):
        
        ttk.Frame.__init__(self, parent)
        self.controller = controller
        self['padding'] = [4, 4, 0, 0]
        
        key1 = 'graph' + str(graphnum) + 'line1'
        key2 = 'graph' + str(graphnum) + 'line2'
        key3 = 'graph' + str(graphnum) + 'line3'

        data1 = self.controller.TKvariables[key1][1]
        color1 = self.controller.TKvariables[key1][2]   
            
        data2 = self.controller.TKvariables[key2][1]
        color2 = self.controller.TKvariables[key2][2]        
        
        data3 = self.controller.TKvariables[key3][1] 
        color3 = self.controller.TKvariables[key3][2]        
        
        #Create 3 comboboxes to select up to 3 datas to plot
        data1label = ttk.Label(self, text='Data 1 position in string')
        self.data1box = ttk.Combobox(self, width=3, values=self.controller.datalist, \
                        textvariable=data1, postcommand=self.updatecblist)            
        data1color = tk.Button(self, bg=color1.get(), width=1,\
            command=lambda:self.setcolor(data1color,1,1,color1))
        CreateToolTip(data1label,\
        "The position of the first value to plot in the incoming line. It is one indexed, so "
        "the first value is in position 1")
        
        data2label = ttk.Label(self, text='Data 2 position in string')
        self.data2box = ttk.Combobox(self, width=3, values=self.controller.datalist, \
                        textvariable=data2, postcommand=self.updatecblist)
        data2color = tk.Button(self, bg=color2.get(), width=1,\
            command=lambda:self.setcolor(data2color,1,2,color2))                                    
        CreateToolTip(data2label,\
        "The position of the second value in the incoming line. It is one indexed, so "
        "the first value is in position 1")       
        
        data3label = ttk.Label(self, text='Data 3 position in string')
        self.data3box = ttk.Combobox(self, width=3, values=self.controller.datalist, \
                        textvariable=data3, postcommand=self.updatecblist)
        data3color = tk.Button(self, bg=color3.get(), width=1,\
            command=lambda:self.setcolor(data3color,1,3,color3))                        
        CreateToolTip(data3label,\
        "The position of the third value in the incoming line. It is one indexed, so "
        "the first value is in position 1")   
        
        #Create an advanced options button
        AObutton = ttk.Button(self, text='Advanced Options', \
            command=lambda:self.AObutton(graphnum))
        
        data1label.grid(row=1, column = 1, columnspan=3, sticky='w', pady = 3)
        self.data1box.grid(row=1, column=4, sticky='w', padx = 5)  
        data1color.grid(row=1, column=5, padx=2)
        
        data2label.grid(row=2, column = 1, columnspan=3, sticky='w', pady = 3)
        self.data2box.grid(row=2, column=4, sticky='w', padx = 5)
        data2color.grid(row=2, column=5)   
        
        data3label.grid(row=3, column=1, columnspan=3, sticky='w', pady = 3)
        self.data3box.grid(row=3, column=4, sticky='w', padx = 5)
        data3color.grid(row=3, column=5)       
        
        #Ymin\Ymax
        key = 'g'+str(graphnum)+'ylims'
        ttk.Label(self, text='Ymin').grid(row=4, column=1, sticky='w')
        ttk.Entry(self, width=5, textvariable=self.controller.TKvariables[key][0] \
            ).grid(row=4, column=2, sticky='ew')
        ttk.Label(self, text='Ymax').grid(row=4, column=3, sticky='e', padx=3)
        ttk.Entry(self, width=6, textvariable=self.controller.TKvariables[key][1] \
            ).grid(row=4, column=4, sticky='ew', padx=5)
        
        AObutton.grid(row=5, column=1, columnspan=5, sticky='nsew', pady=6)
        
    def updatecblist(self):
        num_vars = int(self.controller.TKvariables['datalength'].get())
        self.controller.datalist = list(range(1,num_vars+1))
        self.controller.datalist.insert(0, '-')        
        self.data1box['values'] = self.controller.datalist
        self.data2box['values'] = self.controller.datalist
        self.data3box['values'] = self.controller.datalist
        
    def setcolor(self, button, graph, line, initialcolor):
        color = colorchooser.askcolor(initialcolor=initialcolor.get())
        #If the user hits cancel, the dialog returns a "Nonetype" object
        #which causes issues, so check for it:
        if isinstance(color[1], str):
            button['bg'] = color[1]
            key = 'graph'+str(graph)+'line'+str(line)
            self.controller.TKvariables[key][2].set(value=color[1])
            
    def AObutton(self, graphnum):
        toplvl = tk.Toplevel()
        toplvl.withdraw()
        frame = ttk.Frame(toplvl, padding=[2, 3, 3, 0])
        
        boxwidth = 15
        
        #Create the labels
        lbl = ttk.Label(frame, text='Label')
        CreateToolTip(lbl, \
        'This text will show up in the legend and the log file')
        lbl.grid(row=0, column=1)
        
        mult = ttk.Label(frame, text='Multiplier')
        CreateToolTip(mult, \
        'Multiply by this value')
        mult.grid(row=0, column=2)
        
        offset = ttk.Label(frame, text='Offset') 
        CreateToolTip(offset, \
        'Add this value. Happens AFTER the data is multiplied')
        offset.grid(row=0, column=3)  
        
        dashed = ttk.Label(frame, text='Dashed')
        CreateToolTip(dashed, \
        'If checked, the line will be dashed')
        dashed.grid(row=0, column=4)  
        
        ttk.Label(frame, text='Line 1').grid(row=1, column=0, padx=2)
        ttk.Label(frame, text='Line 2').grid(row=2, column=0, padx=2)
        ttk.Label(frame, text='Line 3').grid(row=3, column=0, padx=2) 

        for row in range(1,3+1):
            key = 'graph'+str(graphnum)+'line'+str(row)
            #Label
            ttk.Entry(frame, width=boxwidth, \
                textvariable=self.controller.TKvariables[key][0]).grid(row=row, column=1)
            #Multiplier
            ttk.Entry(frame, width=boxwidth, \
                textvariable=self.controller.TKvariables[key][4]).grid(row=row, column=2)
            #Offset
            ttk.Entry(frame, width=boxwidth, \
                textvariable=self.controller.TKvariables[key][5]).grid(row=row, column=3) 
            #Dashed
            ttk.Checkbutton(frame, onvalue='--', offvalue='-', \
                variable=self.controller.TKvariables[key][3]).grid(row=row, column=4)
        ttk.Button(frame, text='OK', command=toplvl.destroy).grid(row=5,\
            column=3, columnspan=2, sticky='ew', pady=4)
        
        #Center the window
        frame.grid()
        toplvl.update()
        scrwidth = toplvl.winfo_screenwidth()
        scrheight = toplvl.winfo_screenheight()
        winwidth = toplvl.winfo_reqwidth()
        winheight = toplvl.winfo_reqheight()
        winposx = int(round(scrwidth/2 - winwidth/2))
        winposy = int(round(scrheight/2 - winheight/2))
        toplvl.geometry('{}x{}+{}+{}'.format(winwidth, winheight, winposx, winposy))
        toplvl.deiconify()
        
        
class CreateToolTip(object):
    """
    create a tooltip for a given widget
    """
    def __init__(self, widget, text='widget info'):
        self.waittime = 500     #miliseconds
        self.wraplength = 180   #pixels
        self.widget = widget
        self.text = text
        self.widget.bind("<Enter>", self.enter)
        self.widget.bind("<Leave>", self.leave)
        self.widget.bind("<ButtonPress>", self.leave)
        self.id = None
        self.tw = None

    def enter(self, event=None):
        self.schedule()

    def leave(self, event=None):
        self.unschedule()
        self.hidetip()

    def schedule(self):
        self.unschedule()
        self.id = self.widget.after(self.waittime, self.showtip)

    def unschedule(self):
        id = self.id
        self.id = None
        if id:
            self.widget.after_cancel(id)

    def showtip(self, event=None):
        x = y = 0
        x, y, cx, cy = self.widget.bbox("insert")
        x += self.widget.winfo_rootx() + 25
        y += self.widget.winfo_rooty() + 20
        # creates a toplevel window
        self.tw = tk.Toplevel(self.widget)
        # Leaves only the label and removes the app window
        self.tw.wm_overrideredirect(True)
        self.tw.wm_geometry("+%d+%d" % (x, y))
        label = ttk.Label(self.tw, text=self.text, justify='left',
                       background="#ffffff", relief='solid', borderwidth=1,
                       wraplength = self.wraplength)
        label.pack(ipadx=1)

    def hidetip(self):
        tw = self.tw
        self.tw = None
        if tw:
            tw.destroy()
            
#If this script is executed, just run the main script
if __name__ == '__main__':
    os.system("serialplot.py")