#Turtle Graphics Game
import turtle
import math
import random

#Set up screen
wn = turtle.Screen()
wn.bgcolor("lightgreen")
wn.tracer(3)

#Draw border
mypen = turtle.Turtle()
mypen.penup()
mypen.setposition(-300, -300)
mypen.pendown()
mypen.pensize(3)
for side in range(4):
    mypen.forward(600)
    mypen.left(90)
mypen.hideturtle()

#Create player turtle
player = turtle.Turtle()
player.color("blue")
player.shape("triangle")
player.penup()
player.speed(0)

#Create goals
maxGoals = 6
goals = []

for count in range(maxGoals):
    goals.append(turtle.Turtle())
    goals[count].color("red")
    goals[count].shape("circle")
    goals[count].penup()
    goals[count].speed(0)
    goals[count].setposition(random.randint(-300,300), random.randint(-300,300))

#Set speed variable
speed = 1

#Define functions

def turnleft():
    player.left(30)

def turnright():
    player.right(30)

def increasespeed():
    global speed
    speed += 1

def decreasespeed():
    global speed
    speed -= 1
    if speed < 0:
        speed = 0

def isCollision(t1, t2):
    d = math.sqrt(math.pow(t1.xcor() - t2.xcor(),2) + math.pow(t1.ycor() - t2.ycor(),2))
    if d < 20:
        return True
    else:
        return False


#Set keyboard bindings
turtle.listen()
turtle.onkey(turnleft, "Left")
turtle.onkey(turnright, "Right")
turtle.onkey(increasespeed, "Up")
turtle.onkey(decreasespeed, "Down")

while True:
    player.forward(speed)

    #Boundary Checking
    if player.xcor() > 300 or player.xcor() < -300:
        player.right(180)

    #Boundary Checking
    if player.ycor() > 300 or player.ycor() < -300:
        player.right(180)

    
    #Move the goals
    for count in range(maxGoals):
        goals[count].forward(3)

        #Boundary Checking
        if goals[count].xcor() > 290 or goals[count].xcor() <-290:
            goals[count].right(180)

        #Boundary Checking
        if goals[count].ycor() > 290 or goals[count].ycor() <-290:
            goals[count].right(180)

        #Collision checking
        if isCollision(player, goals[count]):
            goals[count].setposition(random.randint(-300,300), random.randint(-300,300))
            goals[count].right(random.randint(0, 360))