realpythonmaterials/build-python-turtle-game-space-invaders-clone/source_code_step_3/turtle_invaders.py at master · ReaperGameStudio/realpythonmaterials · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
import turtle

CANNON_STEP = 10
LASER_LENGTH = 20
LASER_SPEED = 10

window = turtle.Screen()
window.tracer(0)
window.setup(0.5, 0.75)
window.bgcolor(0.2, 0.2, 0.2)
window.title("The Real Python Space Invaders")

LEFT = -window.window_width() / 2
RIGHT = window.window_width() / 2
TOP = window.window_height() / 2
BOTTOM = -window.window_height() / 2
FLOOR_LEVEL = 0.9 * BOTTOM
GUTTER = 0.025 * window.window_width()

# Create laser cannon
cannon = turtle.Turtle()
cannon.penup()
cannon.color(1, 1, 1)
cannon.shape("square")
cannon.setposition(0, FLOOR_LEVEL)

lasers = []


def draw_cannon():
    cannon.clear()
    cannon.turtlesize(1, 4)  # Base
    cannon.stamp()
    cannon.sety(FLOOR_LEVEL + 10)
    cannon.turtlesize(1, 1.5)  # Next tier
    cannon.stamp()
    cannon.sety(FLOOR_LEVEL + 20)
    cannon.turtlesize(0.8, 0.3)  # Tip of cannon
    cannon.stamp()
    cannon.sety(FLOOR_LEVEL)


def move_left():
    new_x = cannon.xcor() - CANNON_STEP
    if new_x >= LEFT + GUTTER:
        cannon.setx(new_x)
        draw_cannon()


def move_right():
    new_x = cannon.xcor() + CANNON_STEP
    if new_x <= RIGHT - GUTTER:
        cannon.setx(new_x)
        draw_cannon()


def create_laser():
    laser = turtle.Turtle()
    laser.penup()
    laser.color(1, 0, 0)
    laser.hideturtle()
    laser.setposition(cannon.xcor(), cannon.ycor())
    laser.setheading(90)
    # Move laser to just above cannon tip
    laser.forward(20)
    # Prepare to draw the laser
    laser.pendown()
    laser.pensize(5)

    lasers.append(laser)


def move_laser(laser):
    laser.clear()
    laser.forward(LASER_SPEED)
    # Draw the laser
    laser.forward(LASER_LENGTH)
    laser.forward(-LASER_LENGTH)


# Key bindings
window.onkeypress(move_left, "Left")
window.onkeypress(move_right, "Right")
window.onkeypress(create_laser, "space")
window.onkeypress(turtle.bye, "q")
window.listen()

draw_cannon()

# Game loop
while True:
    # Move all lasers
    for laser in lasers.copy():
        move_laser(laser)
        # Remove laser if it goes off screen
        if laser.ycor() > TOP:
            laser.clear()
            laser.hideturtle()
            lasers.remove(laser)
            turtle.turtles().remove(laser)
    window.update()

turtle.done()