Special Ranges#

When using a range such as -1 to 1 then expect the range in the for loop to give an error. This can be solved by using numpy arange. The relative positions of the minimum and maximum tick values can be made into variables:

rel_min = ((slider_val - from_size) / 2 + bw_val) / len_val
rel_max = 1 - ((slider_val - to_size) / 2 - bw_val) / len_val

Create a numpy array of the data in our range:

data = np.arange(from_val, to_val+tick_val, tick_val)

the construction is similar to the range. To ensure the maximum value is included add the tick value to the to_val. As the data is an array of floats round the values, then convert to a tuple:

data = np.round(data,1)
range_vals = tuple(data)
len_rvs = len(range_vals)

numpy round does not round to the floor but rounds to the nearest digit.

The tick placement was changed slightly to accomodate the negative values and small tick intervals:

for i, rv in enumerate(range_vals):
    item = ttk.Label(root, text=rv)
    item.place(in_=scth, bordermode='outside',
            relx=(rel_min + i / (len_rvs - 1) * (rel_max - rel_min)) ,
            rely=1, anchor='n')

Show/Hide Code 06ttk_tkinter_range.py

import tkinter as tk
from tkinter import font
import tkinter.ttk as ttk
import numpy as np

from_val = 0
to_val = 100
len_val = 500
res_val = 10
tick_val = 10
dig_val = 2
bw_val = 1 # trough border width
slider_val = 36
sc_range = abs(to_val - from_val) # scale range

def selh(val):
    labh.config(text=round(float(scth.get())+0.0049,2))
    print('horiz', scth.get(), val.x)

root = tk.Tk()
root.geometry(str(len_val+100)+"x200+500+500")
s = ttk.Style()
s.theme_use('default')

def_font = font.nametofont('TkDefaultFont')
from_size = def_font.measure(from_val)
to_size = def_font.measure(to_val)

sch = tk.Scale(root, from_=from_val, to=to_val, label='Bogusstuinuous', orient='horizontal',
            resolution=res_val, showvalue=1, tickinterval=tick_val, digits=dig_val,
            length=len_val)
sch.grid(sticky='ew')

sep = ttk.Separator(root, orient='horizontal')
sep.grid(row=1, column=0, columnspan=2)

scth = ttk.Scale(root, from_=from_val, to=to_val, length=len_val)
scth.bind("<ButtonRelease-1>", selh)
scth.grid(row=2, column=0, sticky='ew')

rel_min = ((slider_val - from_size) / 2 + bw_val) / len_val
rel_max = 1 - (slider_val /2 - bw_val) / len_val

# using numpy arange instead of range so tick intervals less than 1 can be used
data = np.arange(from_val, to_val+tick_val, tick_val)
data = np.round(data,1)
range_vals = tuple(data)
len_rvs = len(range_vals)

mult = (1 if tick_val >= 1 else (len_rvs - 1) / sc_range)
for i, rv in enumerate(range_vals):
    item = ttk.Label(root, text=rv)
    item.place(in_=scth, bordermode='outside',
                relx=(rel_min + i / (len_rvs - 1) / mult * (rel_max - rel_min)) ,
                rely=1, anchor='n')

labh = ttk.Label(root, text=str(scth.get()))
labh.grid(row=2, column=1)

root.mainloop()

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