# setup4cloth_sim.py

# cloth_simulation.py
# a very simplified cloth simulation

# do not import  numpy
# do not import  PyQt5
# do not import pygame
# do not include os
# do not include sleep
# do not include class
# do not include win32com
# do not import gui
# do not import ttk
# do not import matplotlib
from tkinter import *
from time import *
from random import *
from math import *

# window size
nx = 500
ny = 500

# mouse variables
xm = None
ym = None

win = Tk()
win.title("Cloth Simulation")

canvas = Canvas(win)
canvas.pack()

# set parameters
xy_max = [0, 0]
xy_min = [0, 0]
cloth = {}
vel = {} # velocities
mdrag = {} # mouse drag
prox = {} # proximity
cloth = {}
for iy in range(20, ny-60, nsteps):
 for ix in range(20, nx, nsteps):
  if iy == 20:
   TRC = i
  cloth[i] = (ix,iy)
  prox[i] = int(ix/vp), int(iy/vp)
  vel[i] = 0, 0
  mdrag[i] = 0, 0
  i += 1

 # create velocity list
 vx = [0,0]
 vy = [0,0]

 # define cloth dynamics
 def cloth_dynamics(t, xi, yi, vx, vy, r):
  if ((xi - vx[0]) < 0):
   xi = vx[0]
  elif ((xi - vx[1]) < 0):
   xi = vx[1]
  if ((yi - vy[0]) < 0):
   yi = vy[0]
  elif ((yi - vy[1]) < 0):
   yi = vy[1]

   # calculate
   xi = (xi - vx[0])/r
   yi = (yi - vy[0])/r

   # update
   vx[0] = xi
   vy[0] = yi

   return (xi, yi)

 # define cloth motion
 def cloth_motion(t, xi, yi, vx, vy):
  if ((xi-vx[0]) < 0):
   vx[0] = xi
  elif ((xi-vx[1]) < 0):
   vx[1] = xi
  if ((yi-vy[0]) < 0):
   vy[0] = yi
  elif ((yi-vy[1]) < 0):
   vy[1] = yi

   # calculate
   xi = (xi-vx[0])/r
   yi = (yi-vy[0])/r

   # update
   vx[0] = xi
   vy[0] = yi

   return (xi, yi)

 # define mouse cloth drag
 def mouse_cloth_drag(x, y):
  if (x > 0):
   x -= xm
  else:
   x += xm
  if (y > 0):
   y -= ym
  else:
   y += ym

 # update
 if (x > 0):
  x -= xm
 else:
  x += xm
 if (y > 0):
  y -= ym
 else:
  y += ym

 return x, y