python - My matplotlib bar-chart duplicates every time a function is run, how can I refresh my bar-chart? -
my bar chart created looking around internet here , bar chart seems stack same result on top of previous plot function run instead of changing values while taking data database.
the code below utilizes classes , consists of page created in tkinter alongside use of sqlite3 , function:
class viewtrackdata(tkinter.frame): def __init__(self, parent, controller): tkinter.frame.__init__(self, parent) # label1 = tkinter.label(self, text="this page track data shown.") # label1.grid(row=50, column=70, sticky="nsew") self.athletedata = "" self.athlete = "" self.position = 1 self.times = {} self.roundfigup = "" self.roundfigdown = "" self.x = [] self.y = [] self.text = "" self.trackname = tkinter.spinbox(self, values=tracktables, width=50, justify="center", font=entry_font, foreground="#000000", background="#ffffff") self.trackname.place(relx=0.15, rely=0.1) self.eventyear = tkinter.entry(self, width=50, justify="center", font=entry_font, foreground="#000000", background="#ffffff") self.eventyear.insert(0, "the year event took place.") self.eventyear.place(relx=0.15, rely=0.41) self.yeargroup = tkinter.spinbox(self, from_=7, to=11, width=50, justify="center", font=entry_font, foreground="#000000", background="#ffffff") self.yeargroup.place(relx=0.15, rely=0.70) self.filterbutton = tkinter.button(self, text="filter", bg="#383a39", fg="#ab97bd", width=15, height=3, command=self.show_graph) self.filterbutton.place(relx=0.24, rely=0.82) self.infolabel = tkinter.label(self, height=25, width=40, wraplength=300, anchor="center", relief="groove", font=font_use) self.infolabel.place(relx=0.52, rely=0.1) def show_graph(self): self.infolabel.configure(text="") c.execute("select * " + self.trackname.get() + " year_of_event = ? , athlete_year_group = ? " "order athlete_time asc", (self.eventyear.get(), self.yeargroup.get())) self.athletedata = c.fetchall() if self.athletedata none: self.infolabel.configure(text="there no records in year year group.") else: self.item in self.athletedata: self.athlete = self.item self.times.update({self.athlete[1] : self.position}) # adds data name of athlete key , position athlete placed value. self.position += 1 # increments position value self.x.append(self.times[self.athlete[1]]) # adds position in athlete placed argument x axis self.truncatedtime = str(self.athlete[3]).replace((self.athlete[3])[5:],"") # turns value seconds athlete has run under string , slices off " seconds" print(self.truncatedtime) if int((self.truncatedtime)[3]) >= 5: # if statement rounds or down depending on first value after decimal point. self.roundfigup = math.ceil(float(self.truncatedtime)) self.y.append(int(self.roundfigup)) else: self.roundfigdown = math.floor(float(self.truncatedtime)) self.y.append(int(self.roundfigdown)) self.text += ("representing number " + str(self.times[self.athlete[1]]) + " " + str(self.athlete[1]) + ", ") self.infolabel.configure(text=self.text) print(self.athlete) plt.bar(self.x, self.y, label="athlete time bars", color="green") plt.xlabel("athlete positions") plt.ylabel("athlete time") plt.title("bar chart, representing times of athletes.") plt.legend() plt.show() i have tried search answer can't seem able implement see program.
i apologize beforehand if question seems noob-ish you.
there 1 last thing request.
could explain me how should go using plt.xticks? in order change labels numbers actual names of athletes. denoted self.athlete[1].
every time show_graph called more data appended self.x , self.y:
self.x.append(self.times[self.athlete[1]]) ... if int((self.truncatedtime)[3]) >= 5: self.roundfigup = math.ceil(float(self.truncatedtime)) self.y.append(int(self.roundfigup)) else: self.roundfigdown = math.floor(float(self.truncatedtime)) self.y.append(int(self.roundfigdown)) the fix re-initialize self.x , self.y @ beginning of show_graph:
def show_graph(self): self.x = [] self.y = [] ... the initialization of self.x , self.y happens within __init__ method happens once, when viewtrackdata frame instantiated.
ps. may interested in seeing this example shows how embed matplotlib figure inside tk app. 1 advantage of doing way showing graph not freeze rest of app's graphical user interface (e.g. menus , buttons).
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