03-add-player-movement.py

# this program adds the player, the player can be moved with keys right ,left, up and down.
# in addition to that it can be moved with the keys h for left, j for down, k for up and l for right.

from pygame.constants import K_h, K_k
import pywrap
import random

from pygame.locals import (
    K_UP,
    K_DOWN,
    K_LEFT,
    K_RIGHT,
    K_ESCAPE,
    K_h,
    K_j,
    K_k,
    K_l,
)

# create an instance of the game
game = pywrap.PyGame()


# sprite that draws a cloud, all clouds move with the same speed.
class Player(pywrap.ImageSprite):
    def __init__(self, width, height):
        super(Player, self).__init__(
            "jet.png",  # the picture of the sprite
            (255, 255, 255),  # background color of the sprite
            (width / 3, height / 2),  # initial position of sprite
            2,
        )  # drawn above the clouds and the bullets
        self.screen_width = width
        self.screen_height = height

    def handle_key_up(self, game):
        self.rect.move_ip(0, -5)
        if self.rect.top <= 0:
            self.rect.top = 0

    def handle_key_down(self, game):
        self.rect.move_ip(0, 5)
        if self.rect.bottom >= self.screen_height:
            self.rect.bottom = self.screen_height

    def handle_key_left(self, game):
        self.rect.move_ip(-5, 0)
        if self.rect.left <= 0:
            self.rect.left = 0

    def handle_key_right(self, game):
        self.rect.move_ip(5, 0)
        if self.rect.right > self.screen_width:
            self.rect.right = self.screen_width


player = Player(game.screen_width(), game.screen_height())
game.add_key_pressed_event(K_UP, player.handle_key_up)
game.add_key_pressed_event(K_k, player.handle_key_up)

game.add_key_pressed_event(K_DOWN, player.handle_key_down)
game.add_key_pressed_event(K_j, player.handle_key_down)

game.add_key_pressed_event(K_LEFT, player.handle_key_left)
game.add_key_pressed_event(K_h, player.handle_key_left)

game.add_key_pressed_event(K_RIGHT, player.handle_key_right)
game.add_key_pressed_event(K_l, player.handle_key_right)

game.add_sprite(player)

# sprite that dkraws a cloud, all clouds move with the same speed.
class Cloud(pywrap.ImageSprite):
    def __init__(self, width, height):
        super(Cloud, self).__init__(
            "cloud.png",  # the picture of the sprite
            (0, 0, 0),  # background color of the sprite
            (
                random.randint(width + 20, width + 100),
                random.randint(0, height),
            ),  # initial position of sprite
            1,
        )  # layer

    # Move the cloud based on a constant speed
    # Remove it when it passes the left edge of the screen
    def update(self):
        self.rect.move_ip(-5, 0)
        if self.rect.right < 0:
            self.kill()


# is being called when the time event fires (see call to add_timer_event)
def addCloud(game):
    # create a new cloud sprite
    cloud = Cloud(game.screen_width(), game.screen_height())
    # add the cloud sprite to the game.
    game.add_sprite(cloud)


# add a timer to the game. once per second is is calling the addCloud function
game.add_timer_event(1000, addCloud)

# sprite that draws a missile, missiles have different velocity
class Missile(pywrap.ImageSprite):
    def __init__(self, width, height):
        super(Missile, self).__init__(
            "missile.png",  # the picture of the sprite
            (255, 255, 255),  # background color of the sprite
            (
                random.randint(width + 20, width + 100),
                random.randint(0, height),
            ),  # initial position of sprite
            1,
        )  # drawn above the clouds
        self.speed = random.randint(5, 20)

    # Move the cloud based on a constant speed
    # Remove it when it passes the left edge of the screen
    def update(self):
        self.rect.move_ip(-self.speed, 0)
        if self.rect.right < 0:
            self.kill()


# is being called when the time event fires (see call to add_timer_event)
def add_missile(game):
    missile = Missile(game.screen_width(), game.screen_height())
    game.add_sprite(missile)


# add timer, once every 250 millisecond the add_missile function will be called.
game.add_timer_event(250, add_missile)

# run the game loop
game.run()