from gturtle import *
from java.awt.event import KeyAdapter, KeyEvent

makeTurtle()
hideTurtle()

# Linie
setPenColor("black")
setPenWidth(10)

oben = False
unten = False
links = False
rechts = False
stift_an = True

# Rand
RAND_X = 390
RAND_Y = 290

# Geschwindigkeit
GESCHWINDIGKEIT = 2


class Tastatur(KeyAdapter):

    def keyPressed(self, event):
        global oben, unten, links, rechts, stift_an

        taste = event.getKeyCode()

        if taste == KeyEvent.VK_UP:
            oben = True
        elif taste == KeyEvent.VK_DOWN:
            unten = True
        elif taste == KeyEvent.VK_LEFT:
            links = True
        elif taste == KeyEvent.VK_RIGHT:
            rechts = True

        # SPACE = Stift an/aus
        elif taste == KeyEvent.VK_SPACE:
            stift_an = not stift_an

            if stift_an:
                penDown()
            else:
                penUp()

    def keyReleased(self, event):
        global oben, unten, links, rechts

        taste = event.getKeyCode()

        if taste == KeyEvent.VK_UP:
            oben = False
        elif taste == KeyEvent.VK_DOWN:
            unten = False
        elif taste == KeyEvent.VK_LEFT:
            links = False
        elif taste == KeyEvent.VK_RIGHT:
            rechts = False


listener = Tastatur()

getPlayground().addKeyListener(listener)
getPlayground().setFocusable(True)
getPlayground().requestFocus()


# Startposition
setPos(0, 0)
setHeading(0)

# Kleiner Pfeil an der Startposition
penUp()
setPenColor("red")
setPenWidth(3)

forward(15)
left(150)
forward(8)
back(8)
right(300)
forward(8)
back(8)

# Zurück zur Startposition
setPos(0, 0)
setHeading(0)

setPenColor("black")
setPenWidth(10)

if stift_an:
    penDown()


def bewegen():

    while True:

        x = getX()
        y = getY()

        # UP = oben
        if oben and y < RAND_Y:
            setHeading(0)
            forward(GESCHWINDIGKEIT)

        # DOWN = unten
        if unten and y > -RAND_Y:
            setHeading(180)
            forward(GESCHWINDIGKEIT)

        # LEFT = links
        if links and x > -RAND_X:
            setHeading(270)
            forward(GESCHWINDIGKEIT)

        # RIGHT = rechts
        if rechts and x < RAND_X:
            setHeading(90)
            forward(GESCHWINDIGKEIT)

        delay(10)


bewegen()