El amanecer

Lección 18 de 20 del curso Proyecto con Pygame: Defiende la fortaleza de Coddy.

Ahora se puede ganar la noche. Cuando night.time llega a NIGHT, sale el sol, el estado pasa a ser "won" y el bucle deja de actualizar, igual que cuando se pierde.

Haz que el jugador vea venir el amanecer. Cubre el patio con una capa azul oscuro semitransparente, con una opacidad de 120 sobre 255 durante toda la noche, y desvanece la capa durante el último minuto. Crea la Surface shade una sola vez, antes del bucle, como la cubierta, y rellénala en cada fotograma:

dark = min(120, max(0, NIGHT - night.time) * 120 // (60 * 60))
shade.fill((10, 10, 40, dark))
screen.blit(shade, (0, 0))

Cuando quedan 30 segundos, 1800 * 120 // 3600 da 60: la mitad de oscuro. Dibuja la sombra después del caballero y las hachas, pero antes de los rayos y la barra superior, para que la magia y los corazones brillen a través de la oscuridad.

Desafío

Intermedio

Al final de update: cuando self.time >= NIGHT mientras se juega, establece self.state = "won".
Antes del bucle, crea shade, una Surface del tamaño de la ventana con SRCALPHA, y dark_cover, una Surface rellenada con (0, 0, 0, 210). Dibuja la sombra como se indicó arriba, después de las hachas y antes de los proyectiles.
En "won" y "lost", dibuja primero dark_cover; en "won", muestra "Dawn! The keep holds" en letras grandes doradas en (360, 200).

Pruébalo tú mismo

import random
import pygame

WIDTH, HEIGHT = 720, 480
TILE = 48
NIGHT = 60 * 60 * 4
BOSS_AT = NIGHT - 60 * 60
WAVES = [
    ["slime"],
    ["slime", "bat"],
    ["slime", "bat", "spider"],
    ["bat", "spider"],
    ["slime", "spider", "ghost"],
    ["bat", "spider", "ghost"],
    ["spider", "ghost"],
    ["bat", "ghost"],
]
UPGRADES = {
    "Quick bolts": "Bolts fire more often",
    "Sharp bolts": "Bolts hit harder",
    "Spinning axe": "One more axe circles you",
    "Swift boots": "You walk faster",
    "Gem magnet": "Gems come from further",
    "Hearty meal": "Get back a heart",
}
WHITE = (240, 240, 240)
BOLT = (120, 200, 255)
GOLD = (250, 200, 60)

pygame.init()
screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("Hold the Keep")
clock = pygame.time.Clock()
font = pygame.font.Font("assets/fonts/pixel.ttf", 24)
small_font = pygame.font.Font("assets/fonts/pixel.ttf", 16)
big_font = pygame.font.Font("assets/fonts/pixel.ttf", 48)


def load(name):
    return pygame.image.load("assets/images/" + name).convert_alpha()


def sound(name):
    return pygame.mixer.Sound("assets/sounds/" + name)


def whiten(image):
    white = image.copy()
    white.fill((255, 255, 255), special_flags=pygame.BLEND_RGB_MAX)
    return white


floor_img = load("floor.png")
wall_img = load("wall.png")
knight_img = load("knight.png")
axe_img = load("axe.png")
gem_img = load("gem.png")
heart_img = load("heart.png")
empty_img = load("heart_empty.png")
MONSTERS = {
    "slime": {"image": load("slime.png"), "speed": 1.0, "hp": 1, "size": 28},
    "bat": {"image": load("dungeon_bat.png"), "speed": 1.6, "hp": 1, "size": 28},
    "spider": {"image": load("spider.png"), "speed": 1.2, "hp": 3, "size": 28},
    "ghost": {"image": load("ghost.png"), "speed": 0.8, "hp": 4, "size": 28},
    "boss": {"image": pygame.transform.scale(load("ghost.png"), (96, 96)), "speed": 0.7, "hp": 120, "size": 64},
}
hit_sound = sound("hit.ogg")
hurt_sound = sound("thud.ogg")
gem_sound = sound("coin.ogg")
level_sound = sound("powerup.ogg")

courtyard = pygame.Rect(TILE, TILE, WIDTH - 2 * TILE, HEIGHT - 2 * TILE)
background = pygame.Surface((WIDTH, HEIGHT))
for row in range(HEIGHT // TILE):
    for col in range(WIDTH // TILE):
        x = col * TILE
        y = row * TILE
        if courtyard.collidepoint(x, y):
            background.blit(floor_img, (x, y))
        else:
            background.blit(wall_img, (x, y))
cover = pygame.Surface((WIDTH, HEIGHT), pygame.SRCALPHA)
cover.fill((0, 0, 0, 150))


def draw(image, center):
    screen.blit(image, image.get_rect(center=center))


def clock_text(frames):
    seconds = frames // 60
    return f"{seconds // 60}:{seconds % 60:02d}"


def edge_point():
    side = random.randint(0, 3)
    if side == 0:
        return (random.randint(0, WIDTH), -24)
    if side == 1:
        return (random.randint(0, WIDTH), HEIGHT + 24)
    if side == 2:
        return (-24, random.randint(0, HEIGHT))
    return (WIDTH + 24, random.randint(0, HEIGHT))


class Knight(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.image = knight_img
        self.rect = pygame.Rect(0, 0, 24, 24)
        self.rect.center = courtyard.center
        self.speed = 3
        self.hearts = 5
        self.max_hearts = 5
        self.hurt = 0
        self.bolt_wait = 30
        self.bolt_damage = 1
        self.axes = 1
        self.magnet = 80

    def move(self, keys):
        if keys[pygame.K_LEFT]:
            self.rect.x -= self.speed
        if keys[pygame.K_RIGHT]:
            self.rect.x += self.speed
        if keys[pygame.K_UP]:
            self.rect.y -= self.speed
        if keys[pygame.K_DOWN]:
            self.rect.y += self.speed
        self.rect.clamp_ip(courtyard)


class Monster(pygame.sprite.Sprite):
    def __init__(self, kind, pos):
        super().__init__()
        self.kind = kind
        self.image = MONSTERS[kind]["image"]
        self.speed = MONSTERS[kind]["speed"]
        self.hp = MONSTERS[kind]["hp"]
        self.axe_wait = 0
        self.flash = 0
        self.pos = pygame.Vector2(pos)
        self.rect = pygame.Rect(0, 0, MONSTERS[kind]["size"], MONSTERS[kind]["size"])
        self.rect.center = self.pos

    def update(self, target):
        step = pygame.Vector2(target) - self.pos
        if step.length() > 0:
            self.pos += step.normalize() * self.speed
        self.rect.center = self.pos
        if self.axe_wait > 0:
            self.axe_wait -= 1
        if self.flash > 0:
            self.flash -= 1

    def hit(self, damage):
        self.hp -= damage
        self.flash = 6
        hit_sound.play()


class Bolt(pygame.sprite.Sprite):
    def __init__(self, start, target, damage):
        super().__init__()
        self.pos = pygame.Vector2(start)
        step = pygame.Vector2(target) - self.pos
        if step.length() == 0:
            step = pygame.Vector2(1, 0)
        self.velocity = step.normalize() * 7
        self.damage = damage
        self.rect = pygame.Rect(0, 0, 10, 10)
        self.rect.center = self.pos

    def update(self):
        self.pos += self.velocity
        self.rect.center = self.pos
        if not screen.get_rect().colliderect(self.rect):
            self.kill()


class Gem(pygame.sprite.Sprite):
    def __init__(self, pos):
        super().__init__()
        self.rect = pygame.Rect(0, 0, 24, 24)
        self.rect.center = pos
        self.rect.clamp_ip(courtyard)
        self.pos = pygame.Vector2(self.rect.center)

    def update(self, knight):
        target = pygame.Vector2(knight.rect.center)
        if self.pos.distance_to(target) < knight.magnet:
            self.pos.move_towards_ip(target, 6)
        self.rect.center = self.pos


class Night:
    def __init__(self):
        self.knight = Knight()
        self.time = 0
        self.monsters = pygame.sprite.Group()
        self.bolts = pygame.sprite.Group()
        self.bolt_timer = 0
        self.spin = 0
        self.gems = pygame.sprite.Group()
        self.xp = 0
        self.level = 1
        self.need = 5
        self.choices = []
        self.pick = 0
        self.boss = None
        self.state = "playing"

    def wave(self):
        return min(len(WAVES), self.time * len(WAVES) // NIGHT + 1)

    def spawn(self):
        wave = self.wave()
        if self.time % max(16, 46 - wave * 5) == 0:
            kind = random.choice(WAVES[wave - 1])
            self.monsters.add(Monster(kind, edge_point()))
        if self.boss is None and self.time >= BOSS_AT:
            self.boss = Monster("boss", (WIDTH // 2, -40))
            self.monsters.add(self.boss)
        boss = self.boss
        if boss and boss.alive() and boss.hp < MONSTERS["boss"]["hp"] // 2:
            if self.time % 120 == 0:
                for _ in range(3):
                    offset = (random.randint(-50, 50), random.randint(-50, 50))
                    self.monsters.add(Monster("bat", boss.pos + offset))

    def nearest(self):
        point = pygame.Vector2(self.knight.rect.center)
        best = None
        for monster in self.monsters:
            if best is None or point.distance_to(monster.pos) < point.distance_to(best.pos):
                best = monster
        return best

    def shoot(self):
        self.bolt_timer += 1
        target = self.nearest()
        if self.bolt_timer >= self.knight.bolt_wait and target is not None:
            self.bolt_timer = 0
            bolt = Bolt(self.knight.rect.center, target.pos, self.knight.bolt_damage)
            self.bolts.add(bolt)

    def axe_spots(self):
        spots = []
        for i in range(self.knight.axes):
            angle = self.spin + i * 360 / self.knight.axes
            offset = pygame.Vector2(70, 0).rotate(angle)
            spots.append(pygame.Vector2(self.knight.rect.center) + offset)
        return spots

    def hurt_monsters(self):
        for bolt in self.bolts:
            target = pygame.sprite.spritecollideany(bolt, self.monsters)
            if target is not None:
                target.hit(bolt.damage)
                bolt.kill()
        for spot in self.axe_spots():
            blade = pygame.Rect(0, 0, 36, 36)
            blade.center = spot
            for monster in self.monsters:
                if monster.axe_wait == 0 and blade.colliderect(monster.rect):
                    monster.hit(1)
                    monster.axe_wait = 20
        for monster in list(self.monsters):
            if monster.hp <= 0:
                monster.kill()
                drops = 8 if monster.kind == "boss" else 1
                for _ in range(drops):
                    self.gems.add(Gem(monster.pos))

    def collect(self):
        for gem in pygame.sprite.spritecollide(self.knight, self.gems, True):
            self.xp += 1
            gem_sound.play()
        if self.xp >= self.need:
            self.xp -= self.need
            self.level += 1
            self.need += 4
            self.choices = random.sample(list(UPGRADES), 3)
            self.pick = 1
            self.state = "levelup"
            level_sound.play()

    def upgrade(self, name):
        knight = self.knight
        if name == "Quick bolts":
            knight.bolt_wait = max(8, knight.bolt_wait - 8)
        elif name == "Sharp bolts":
            knight.bolt_damage += 1
        elif name == "Spinning axe":
            knight.axes += 1
        elif name == "Swift boots":
            knight.speed += 1
        elif name == "Gem magnet":
            knight.magnet += 40
        elif name == "Hearty meal":
            knight.hearts = min(knight.max_hearts, knight.hearts + 1)
        self.state = "playing"

    def take_hits(self):
        knight = self.knight
        if knight.hurt > 0:
            knight.hurt -= 1
        elif pygame.sprite.spritecollideany(knight, self.monsters):
            knight.hearts -= 1
            knight.hurt = 75
            hurt_sound.play()
            if knight.hearts <= 0:
                self.state = "lost"

    def update(self, keys):
        self.time += 1
        self.spin = (self.spin + 4) % 360
        self.knight.move(keys)
        self.spawn()
        self.monsters.update(self.knight.rect.center)
        self.bolts.update()
        self.gems.update(self.knight)
        self.shoot()
        self.hurt_monsters()
        self.collect()
        self.take_hits()


night = Night()

running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.KEYDOWN:
            if night.state == "levelup":
                if event.key == pygame.K_LEFT:
                    night.pick = (night.pick - 1) % 3
                elif event.key == pygame.K_RIGHT:
                    night.pick = (night.pick + 1) % 3
                elif event.key == pygame.K_SPACE:
                    night.upgrade(night.choices[night.pick])

    if night.state == "playing":
        night.update(pygame.key.get_pressed())

    screen.blit(background, (0, 0))
    knight = night.knight
    for gem in night.gems:
        draw(gem_img, gem.rect.center)
    for monster in night.monsters:
        if monster.flash > 0:
            draw(whiten(monster.image), monster.rect.center)
        else:
            draw(monster.image, monster.rect.center)
    if knight.hurt % 10 < 5:
        draw(knight.image, knight.rect.center)
    for spot in night.axe_spots():
        draw(pygame.transform.rotate(axe_img, -night.spin * 3), spot)
    for bolt in night.bolts:
        pygame.draw.circle(screen, BOLT, bolt.rect.center, 5)
    for i in range(knight.max_hearts):
        if i < knight.hearts:
            screen.blit(heart_img, (8 + i * 34, 6))
        else:
            screen.blit(empty_img, (8 + i * 34, 6))
    left = font.render(clock_text(max(0, NIGHT - night.time)) + " until dawn", True, WHITE)
    screen.blit(left, left.get_rect(center=(WIDTH // 2, 24)))
    label = font.render(f"Level {night.level}", True, WHITE)
    screen.blit(label, label.get_rect(topright=(WIDTH - 10, 4)))
    pygame.draw.rect(screen, (40, 40, 60), (WIDTH - 160, 30, 150, 10))
    pygame.draw.rect(screen, GOLD, (WIDTH - 160, 30, 150 * night.xp // night.need, 10))
    if night.state == "levelup":
        screen.blit(cover, (0, 0))
        title = big_font.render("Level up! Pick one", True, GOLD)
        screen.blit(title, title.get_rect(center=(WIDTH // 2, 130)))
        for i, name in enumerate(night.choices):
            card = pygame.Rect(60 + i * 210, 190, 180, 120)
            pygame.draw.rect(screen, (40, 40, 60), card)
            if i == night.pick:
                pygame.draw.rect(screen, GOLD, card, 4)
            else:
                pygame.draw.rect(screen, WHITE, card, 2)
            text = font.render(name, True, WHITE)
            screen.blit(text, text.get_rect(center=(card.centerx, card.y + 40)))
            about = small_font.render(UPGRADES[name], True, WHITE)
            screen.blit(about, about.get_rect(center=(card.centerx, card.y + 80)))
        hint = font.render("Left and Right to choose, Space to take it", True, WHITE)
        screen.blit(hint, hint.get_rect(center=(WIDTH // 2, 360)))
    if night.state == "lost":
        message = big_font.render("The keep has fallen", True, WHITE)
        screen.blit(message, message.get_rect(center=(WIDTH // 2, 200)))
    pygame.display.flip()
    clock.tick(60)

pygame.quit()