Plotting lines with pyplot when button clicked with values from tkinter spinbox

Question

This is a follow up question to the one asked before. I have a code below:

from tkinter import *

from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg
from matplotlib.figure import Figure

class PlotClass():
    def __init__(self):
         fig = Figure(figsize=(5,5),dpi=70,facecolor='cyan')
         ax = fig.subplots()
         ax.set_title("Ttile")
         ax.set_ylabel("y")
         ax.set_xlabel("x")
         ax.set_xlim(100,9000)
         ax.set_ylim(130,-10)
         ax.set_facecolor("cyan")

         x = [125,250,500,1000,2000,4000,8000]
         ticks = [125,250,500,"1K","2K","4K","8K"]
         xm = [750,1500,3000,6000]

         ax.set_xscale('log', basex=2)
         ax.set_xticks(x)
         ax.set_xticks(xm, minor=True)
         ax.set_xticklabels(ticks)
         ax.set_xticklabels([""]*len(xm), minor=True)

         ax.yaxis.set_ticks([120,110,100,90,80,70,60,50,40,30,20,10,0,-10])

         self.line, = ax.plot([],[],'r+',markersize=15.0,mew=2)
         self.line2,= ax.plot([],[],'-o',markersize=15.0,mew=2)
         ax.grid(color="grey")
         ax.grid(axis="x", which='minor',color="grey", linestyle="--")
         self.canvas = canvas = FigureCanvasTkAgg(fig, master=master)
         canvas.show()
         canvas.get_tk_widget().grid(column=0,row=2,columnspan=3,rowspan=15)
         self.spin = Spinbox(master, from_=125,to=8000,command=self.action)
         self.spin.grid(column=5,row=2)

         self.spin2 = Spinbox(master, from_=-10,to=125,command=self.action)
         self.spin2.grid(column=5,row=3)

         self.button = Button(master, text="plot here",command=self.plot)
         self.button.grid(column=5,row=4)
    def ok(self, x=1000,y=20):
        self.line.set_data([x],[y])
        self.canvas.draw_idle()

    def action(self):
        self.ok(float(self.spin.get()),float(self.spin2.get()))

    def linecreate(self, x=1000,y=20):
        self.line2.set_data([x],[y])
        self.canvas.draw_idle()

    def plot(self):
        self.linecreate(float(self.spin.get()),float(self.spin2.get()))

master = Tk()
plotter = PlotClass()
plotter.ok(125,10)
master.mainloop()

It plots graph by feeding the x and y axis with values from two tkinter spinbox, as the value in spinbox changes the plot redraws and changes the markers location based on the values provided by the spinboxes. Now, I have added a tkinter button and linked it to a function that would draw another plot using the same values coming from the spinboxes but now I could not understand how to draw the new plot without removing the previous plots when the button is pressed. What I mean is, plotting on new locations (adding more markers) on the graph without removing the previous plot locations (previous markers) that has been added by the button press. Like when button clicks it keeps adding the new markers based on the spinbox values without removing the previous ones. In the previous question it was removing the existing plots and adding new ones every time the spinbox value changes but now I could not understand how to plot on new location without removing the previous plot.

ImportanceOfBeingErnest · Accepted Answer · 2017-12-16 07:33:34Z

0

You may append you new point to the data of the existing line.

def linecreate(self, x=1000,y=20):
    X,Y = self.line2.get_data()
    X = np.append(X,[x])
    Y = np.append(Y,[y])
    self.line2.set_data(X,Y)
    self.canvas.draw_idle()

answered Dec 16, 2017 at 7:33

ImportanceOfBeingErnest

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7 Comments

Gobinda Sinha Over a year ago

Actually I forgot to add something in the question. facepalm If consider this: x = [125] and y = [50], the question was suppose to be if initially the x and y was x[125] and y[50] then whenever the value changes to x[125] and y[90] then instead of plotting it again is it possible to change the value of just y only if the x is same.

ImportanceOfBeingErnest Over a year ago

Well then find out if that value is already being in the array, if so, replace the y value, if not append it.

Gobinda Sinha Over a year ago

I did it but seems like it is also changing the plot for those that are not same as x. Could you please provide me with a sample code? Very much appreciated. :)

ImportanceOfBeingErnest Over a year ago

What exactly did you try? (How can I know what's wrong without knowing that?)

Gobinda Sinha Over a year ago

if x in X: to detect if value exists but cannot implement, I mean replace the y value corresponding to that x, could you help me out.

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