spaceinvaders

import turtle
import os

wn = turtle.Screen()
wn.bgcolor("black")
wn.title("Space Invaders")

#De Game screen maken
border_pen = turtle.Turtle()
border_pen.speed(0)
border_pen.color("white")
border_pen.penup()

border_pen.setposition(-300, -300)
border_pen.pendown()
border_pen.pensize(3)
for side in range(4):
    border_pen.fd(600)
    border_pen.lt(90)
border_pen.hideturtle()

#De speler maken

player = turtle.Turtle()
player.color("blue")
player.shape("triangle")
player.penup()
player.speed(0)
player.setposition(0, -250)
player.setheading(90)


playerspeed = 15
# De spaceinvaders
enemy = turtle.Turtle()
enemy.color("red")
enemy.shape("circle")
enemy.penup()
enemy.speed(0)
enemy.setpos(-200, 250)

enemyspeed = 2

#Het wapen van de speler
bullet = turtle.Turtle()
bullet.color("yellow")
bullet.shape("triangle")
bullet.penup()
bullet.speed(0)
bullet.setheading(90)
bullet.shapesize(0.5, 0.5)
bullet.hideturtle()

bulletspeed = 30

#de state waarin de kogel zich bevindt
#gereed- klaar om te schieten
#schieten- de kogel word geschoten
bulletstate = "gereed"

#beweging van de speler
def move_left(event):
    x = player.xcor()
    x -= playerspeed
    if x < -280:
        x = -280
    player.setx(x)
def move_right(event):
    x = player.xcor()
    x += playerspeed
    if x > 280:
        x = 280
    player.setx(x)

def fire_bullet():
    global bulletstate
    #de kogel net boven de speler
    x = player.xcor()
    y = player.ycor() +10
    bullet.setposition(x, y)
    bullet.showturtle()


##Keybinding

turtle.listen()
turtle.getcanvas().bind("<Left>", move_left)
turtle.getcanvas().bind("<Right>", move_right)
turtle.getcanvas().bind("<space>", fire_bullet)


#main game loop
while True:

    #beweging van de spaceinvader
    x = enemy.xcor()
    x += enemyspeed
    enemy.setx(x)

    #Beweging van de spaceinvader terug en naar beneden
    if enemy.xcor() > 280:
        y = enemy.ycor()
        y -= 40          #hoeveel picsels hij dropt per bounce
        enemyspeed *= -1
        enemy.sety(y)
    if enemy.xcor() < -280:
        y = enemy.ycor()
        y -= 40             #hoeveel picsels hij dropt per bounce
        enemyspeed *= -1
        enemy.sety(y)