# ray_casting_with_turtle.py ZZZ

# ray_casting_with_turtle.py ZZZ

import turtle
from math import *

t=turtle.Turtle()
turtle.speed(0) # 5000
turtle.bgcolor("black")
loc=turtle.Turtle()
px=float(5.5)
py=float(5.5)
pa=float(0)
sw=int(120)
sh=int(40)
my=int(16)
mx=int(16)
fov=float(0.15)
fd=float(10)
tx=0
turtle.setworldcoordinates(-300,200,-72,0)
hit=False
t.pu()
t.pensize(7)
t.goto(-300,200)
t.right(90)
t.pd()
ty=0
t.pendown()
turtle.tracer(120)
h=float(0)
loc.goto(5.5,5.5)
loc.penup()
loc.ht()
t.ht()

ma1 = ['x','x','x','x','x','x','x','x','x','x','x','x','x','x','x','x',

      'x','.','.','.','.','.','.','.','.','.','.','.','.','.','.','x',

      'x','.','.','.','.','.','.','.','.','.','.','.','.','.','.','x',

      'x','.','.','.','.','.','.','.','.','.','x','x','x','x','.','x',

      'x','.','.','.','.','.','.','.','.','.','.','.','.','.','.','x',

      'x','.','.','.','.','.','.','.','.','.','.','.','.','.','.','x',

      'x','x','x','.','.','.','.','.','.','.','.','.','.','.','.','x',

      'x','x','.','.','.','.','.','.','.','.','.','.','.','.','.','x',

      'x','.','.','.','.','.','.','.','.','.','x','.','.','x','x','x',

      'x','.','.','.','.','.','.','.','.','.','x','.','.','.','.','x',

      'x','.','.','.','.','x','.','.','.','.','x','.','.','.','.','x',

      'x','.','.','.','.','x','.','.','.','.','.','.','.','.','.','x',

      'x','.','.','.','.','x','.','.','.','.','.','.','.','.','.','x',

      'x','.','.','.','.','x','.','.','.','.','.','.','.','.','.','x',

      'x','.','.','.','.','.','.','.','.','.','.','.','.','.','.','x',

      'x','x','x','x','x','x','x','x','x','x','x','x','x','x','x','x']


turtle.tracer(0,1)

wn = turtle.Screen()

keyboard = ''
def up():
    global keyboard
    keyboard = 'U'

def down():
    global keyboard
    keyboard = 'D'

def left():
    global keyboard
    keyboard = 'L'

def right():
    global keyboard
    keyboard = 'R'

wn.listen()
wn.onkey(up, 'Up')
wn.onkey(down, 'Down')
wn.onkey(left, 'Left')
wn.onkey(right, 'Right')

def everything():
    global hit
    global py
    global px
    global pa
    global keyboard
    while True:
        for i in range (int(sw)):
            if keyboard == 'L':
                loc.left(0.1)

            elif keyboard == 'R':
                loc.right(0.1)

            elif keyboard == 'U':
                loc.backward(0.01)
                if (ma1[int(px-0.1) * mx + int(py-0.1)] == 'x'):
                    loc.backward(-0.01)

            elif keyboard == 'D':
                loc.forward(0.01)
                if (ma1[int(px-0.1) * mx + int(py-0.1)] == 'x'):
                    loc.forward(-0.01)

            ra=float(((pa-fov/2)+(i)/(mx)*fov))

            ex=float(sin(ra))
            ey=float (cos(ra))
            dis=float (0)
            while hit ==False and dis< fd:

                dis=dis+0.1
                tx=int(px+ex*dis)
                ty=int(py+ey*dis)
                if tx<0 or tx>=mx or ty<0 or ty>= my:
                    hit=True

                else:

                    if(ma1[(tx*mx+ty)]=="x"):
                        hit=True
            if dis>= fd:
                hit=True

            if hit ==True:
                if keyboard in 'UDLR':

                    t.color("black")
                    h=40-(dis*4)
                    t.forward((((40-h)/2)*5))
                    turtle.colormode(255)
                    t.pencolor((255-(int(dis*1.2*12.75))),0,0)

                    t.forward((h)*5)
                    t.color("black")
                    t.fd((((40-h)/2))*5)

                    t.pu()
                    t.goto((-300)+i*2,200)
                    t.pd()
                    dis=0
                    hit=False
                    px=loc.pos()[1]
                    py=loc.pos()[0]
                    pi=22/7
                    radian = (loc.heading()-40)*(pi/180)
                    pa=radian

        if keyboard: print keyboard
        keyboard = ''
        turtle.update()
while True:
    turtle.ontimer(everything(),0)