# tk_s_curve.py

# tk_s_curve.py

import tkinter as tk
import random
import math

steps_value = 500
start_y = 200
end_y = 50

def draw_s_curve():
    canvas.delete("all")
    canvas_width = canvas.winfo_width()
    start_x = (canvas_width - steps_value) // 2
    end_x = start_x + steps_value
    for i in range(start_x, end_x + 1):
        x = i - start_x
        y = start_y + (end_y - start_y) * (math.sin((x / steps_value) * math.pi - (math.pi / 2)) + 1) / 2 + 30
        canvas.create_oval(i, y, i, y, fill='black')

def get_steps_value(event):
    global steps_value
    steps_value = int(steps_scale.get())
    draw_s_curve()

def get_start_y(event):
    global start_y
    start_y = 255 - int(start_scale.get())
    draw_s_curve()

def get_end_y(event):
    global end_y
    end_y = 255 - int(end_scale.get())
    draw_s_curve()

root = tk.Tk()
root.title("S-Curve Generator")

canvas = tk.Canvas(root, width=600, height=300, bg="white")
canvas.pack()

steps_scale = tk.Scale(root, from_=8, to=600, orient=tk.HORIZONTAL, label="Steps", command=get_steps_value)
steps_scale.set(steps_value)  # Set default length to 500
steps_scale.pack(fill='x')

start_scale = tk.Scale(root, from_=0, to=255, orient=tk.HORIZONTAL, label="Start Point", command=get_start_y)
start_scale.set(start_y)  # Set default start to 200
start_scale.pack(fill='x')

end_scale = tk.Scale(root, from_=0, to=255, orient=tk.HORIZONTAL, label="End Point", command=get_end_y)
end_scale.set(end_y)  # Set default end to 50
end_scale.pack(fill='x')

root.mainloop()