I am writing a code in tkinter to have a meshed plot. To run the code, you can enter 5 for nx and ny entry boxes, and open a text file containing 25 numbers such as: 1 3 5 6 1 0 3 5 6 4 2 4 7 3 0 9 8 3 1 3 5 7 8 8 1, and then by pressing the Plot, the meshed plot generates. and by moving the sliders, and pressing the Plot again, the axis ranges change.
However, there is one issue, I have entered the max_val=5 for the sliders. I want to get this value from the entry fields like: max_val=data.nx.get(). but when the program runs, my entry fields are initially zero, and it raises an error. Is there a way to pass the execution of the slider widgets, after entering the values in entry boxes?
import tkinter as tk
from tkinter import *
from tkinter import filedialog
import numpy as np
import matplotlib
matplotlib.use('TkAgg')
from matplotlib.figure import Figure
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib import cm
from matplotlib.colors import ListedColormap
from RangeSlider.RangeSlider import RangeSliderH, RangeSliderV
global nums
class Data:
def __init__(self):
self.nx = tk.IntVar()
self.ny = tk.IntVar()
class SampleApp(tk.Tk):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
container = tk.Frame(self)
container.pack()
self.data = Data()
self.frames = {}
for F in (PageOne, PageTwo):
frame = F(container, self.data)
self.frames[F] = frame
frame.grid(row=0, column=0, sticky="nsew")
self.frames[PageOne].button3_P1.config(command=self.go_to_page_two)
self.show_frame(PageOne)
def go_to_page_two(self):
self.show_frame(PageTwo)
def show_frame(self, c):
frame = self.frames[c]
frame.tkraise()
class PageOne(tk.Frame):
def __init__(self, parent, data):
super().__init__(parent)
self.data = data
frame_1 = tk.LabelFrame(self, text="Inputs", labelanchor='n', height=400, width=280)
frame_1.grid(row=0, column=0, padx=5, sticky='n')
label_1 = tk.Label(frame_1, text="nx:")
label_1.grid(row=0, column=0)
self.entry_1 = tk.Entry(frame_1, textvariable=data.nx, width=7)
self.entry_1.grid(row=0, column=1)
label_2 = tk.Label(frame_1, text="ny:")
label_2.grid(row=1, column=0)
self.entry_2 = tk.Entry(frame_1, textvariable=data.ny, width=7)
self.entry_2.grid(row=1, column=1, padx= 10, pady=10)
global nums
def opentext():
global nums
my_file = filedialog.askopenfilenames(initialdir="/pycharm", title="Select your file")
for T in my_file:
import re
with open(T, 'r') as infile1:
lines = infile1.readlines()
B = [x for x in lines if not x.startswith('--')]
C = " ".join(B)
nums = []
for n in re.findall(r'\d ', C):
split_by_ast = n.split("*")
if len(split_by_ast) == 1:
nums = [float(split_by_ast[0])]
else:
nums = [float(split_by_ast[1])] * int(split_by_ast[0])
self.button1 = tk.Button(frame_1, text="Open file", command=opentext, width=10)
self.button1.grid(row=2, column=0, pady=10, columnspan=2)
frame_2 = tk.LabelFrame(self, text="Convas", labelanchor='n', height=550, width=800)
frame_2.grid(row=0, column=1, padx=5)
frame_2.grid_propagate(0)
def plot_init():
global H, V
x, y = np.mgrid[slice(0, 6, 1), slice(0, 6, 1)]
z = np.reshape(nums, (5, 5), order='F')
figure = Figure(figsize=(7.3, 4.8))
ax = figure.add_subplot(111)
col_type = cm.get_cmap('rainbow', 256)
newcolors = col_type(np.linspace(0, 1, 1000))
white = np.array([1, 1, 1, 1])
newcolors[:1, :] = white
newcmp = ListedColormap(newcolors)
c = ax.pcolormesh(x, y, z, cmap=newcmp, edgecolor='lightgrey', linewidth=0.003)
ax.figure.colorbar(c)
ax.set_title('Title', fontweight="bold")
ax.set_xlabel("X", fontsize=14)
ax.set_ylabel("Y", fontsize=14)
canvas = FigureCanvasTkAgg(figure, frame_2)
canvas.get_tk_widget().place(x=80, y=0)
figure.patch.set_facecolor('#f0f0f0')
ax.set_xlim(rs1.getValues())
ax.set_ylim(rs2.getValues())
rs1.place(x=150, y=470)
rs2.place(x=0, y=50)
hVar1 = IntVar() # left handle variable
hVar2 = IntVar() # right handle variable
rs1 = RangeSliderH(frame_2, [hVar1, hVar2], Width=500, Height=55, padX=17, min_val=0, max_val=5, font_size=12,
show_value=True, digit_precision='.0f', bgColor='#f0f0f0', line_s_color='black',
line_color='black', bar_color_inner='black', bar_color_outer='#f0f0f0')
vVar1 = IntVar() # top handle variable
vVar2 = IntVar() # down handle variable
rs2 = RangeSliderV(frame_2, [vVar1, vVar2], Width=81, Height=390, padY=11, min_val=0, max_val=5, font_size=12,
show_value=True, digit_precision='.0f', bgColor='#f0f0f0', line_s_color='black',
line_color='black', bar_color_inner='black', bar_color_outer='#f0f0f0')
self.button2 = tk.Button(frame_1, text="Plot", command=plot_init, width=10)
self.button2.grid(row=3, column=0, columnspan=2)
self.button3_P1 = tk.Button(self, text="Continue")
self.button3_P1.grid(row=2, column=0, columnspan=4, pady=5)
class PageTwo(tk.Frame):
def __init__(self, parent, data):
super().__init__(parent)
self.data = data
app = SampleApp()
app.mainloop()
currently, I am getting this error.
Traceback (most recent call last):
File "C:\Users\pymnb\Desktop\pycharm\Test.py", line 145, in <module>
app = SampleApp()
File "C:\Users\pymnb\Desktop\pycharm\Test.py", line 30, in __init__
frame = F(container, self.data)
File "C:\Users\pymnb\Desktop\pycharm\Test.py", line 122, in __init__
rs1 = RangeSliderH(frame_2, [hVar1, hVar2], Width=500, Height=55, padX=17, min_val=0, max_val=data.nx.get(), font_size=12,
File "C:\Users\pymnb\AppData\Local\Programs\Python\Python39\lib\site-packages\RangeSlider\RangeSlider.py", line 107, in __init__
pos = (value-min_val)/(max_val-min_val)
ZeroDivisionError: division by zero
CodePudding user response：
Assuming input file, nx and ny are mandatory inputs. You should check its correct values, before passing them to plot function.
If nx and ny equals 0 is illegal, You must check if it's higher than 0 and then check if user selected input file.
You should make three changes in Your code:
- Move Your sliders code inside
plot_initmethod and plot them only once - initiate variable
numstoNone, to make checking ifinput filewas selected possible - Check all mandatory values and display error message if conditions are not met
Additionally You might initialize data to default value different than 0:
class Data:
def __init__(self):
self.nx = tk.IntVar(value=1)
self.ny = tk.IntVar(value=1)
Here is modified plot_init method with nums = None before it.
nums = None
self.rs1, self.rs2 = None, None
def plot_init():
global H, V, nums
x_max = data.nx.get()
y_max = data.ny.get()
if x_max == 0 or y_max == 0:
tk.messagebox.showerror(title="Entry Error", message="Check Your input, nx > 0 and ny > 0!")
return
if nums is None:
tk.messagebox.showerror(title="Entry Error", message="Check Your input, no file was opened!")
return
x, y = np.mgrid[slice(0, 6, 1), slice(0, 6, 1)]
z = np.reshape(nums, (5, 5), order='F')
figure = Figure(figsize=(7.3, 4.8))
ax = figure.add_subplot(111)
col_type = cm.get_cmap('rainbow', 256)
newcolors = col_type(np.linspace(0, 1, 1000))
white = np.array([1, 1, 1, 1])
newcolors[:1, :] = white
newcmp = ListedColormap(newcolors)
c = ax.pcolormesh(x, y, z, cmap=newcmp, edgecolor='lightgrey', linewidth=0.003)
ax.figure.colorbar(c)
ax.set_title('Title', fontweight="bold")
ax.set_xlabel("X", fontsize=14)
ax.set_ylabel("Y", fontsize=14)
canvas = FigureCanvasTkAgg(figure, frame_2)
canvas.get_tk_widget().place(x=80, y=0)
figure.patch.set_facecolor('#f0f0f0')
if self.rs1 is None:
self.rs1 = RangeSliderH(frame_2, [IntVar(), IntVar()], Width=500, Height=55, padX=17, min_val=0, max_val=data.nx.get(),
font_size=12,
show_value=True, digit_precision='.0f', bgColor='#f0f0f0', line_s_color='black',
line_color='black', bar_color_inner='black', bar_color_outer='#f0f0f0')
self.rs1.place(x=150, y=470)
if self.rs2 is None:
self.rs2 = RangeSliderV(frame_2, [IntVar(), IntVar()], Width=81, Height=390, padY=11, min_val=0, max_val=data.ny.get(),
font_size=12,
show_value=True, digit_precision='.0f', bgColor='#f0f0f0', line_s_color='black',
line_color='black', bar_color_inner='black', bar_color_outer='#f0f0f0')
self.rs2.place(x=0, y=50)
ax.set_xlim(self.rs1.getValues())
ax.set_ylim(self.rs2.getValues())