# Tk_1D_Curvy_Waves.py

# Tk_1D_Curvy_Waves.py

'''
create curvy waves
'''

from tkinter import *
import PIL
import math
import random

ww = 1400
hh = 600

root=Tk()
root.geometry("%dx%d+-10+0"%(ww,hh))
canvas = Canvas(root,width=ww,height=hh,bg='black')
canvas.grid(row=0,column=0,sticky=N+S+E+W)

def oRGB(rgb):
    r,g,b = rgb
    return "#%02x%02x%02x" % (r,g,b)

def plot():
    canvas.create_line((x, 0, x, y), fill=color)

rgb = 255,255,0 # yellow
color = oRGB(rgb)
red = oRGB((255,0,0))
y = hh/2
steps = 20
vel = 0.0 # velocity

def targets(ttt): # display last
    for x1,aim in enumerate(ttt):
        x1 = x1 * steps
        canvas.create_line((x1+steps*0.5, aim, x1+steps*1.5, aim), fill=red)

def init():
    global x, y, vel
    canvas.delete('all')
    ttt = []
    for x1 in range(0,ww,steps):
        aim = max(20,min(hh-20,y+random.randint(-20,20)))
        ttt += [aim]
        for x2 in range(0,steps):
            x = x1+x2
            vel += (aim-y)/120.0
            y += vel
            plot(x)
    # targets(ttt)
    root.after(1000,init)

init()
root.mainloop()