Gelombang yang Bertambah Besar

Termasuk bagian Aturan Game dalam perjalanan Pygame di Coddy. Pelajaran 13 dari 29.

Banyak game memiliki gelombang: sekelompok musuh, jeda singkat saat musuh terakhir pergi, lalu kelompok yang lebih besar. Ini memberi tahu pemain bahwa game semakin sulit dan memberi mereka waktu untuk bernapas.

Dua angka mengatur ini: wave, gelombang yang sedang kamu hadapi, dan to_spawn, jumlah batu pada gelombang ini yang masih akan dijatuhkan. Timer pemunculan hanya menjatuhkan batu saat to_spawn lebih dari 0:

if event.type == SPAWN and state == "play" and to_spawn > 0:
    rocks.append(pygame.Rect(random.randint(0, 456), -24, 24, 24))
    to_spawn -= 1

Gelombang berakhir saat tidak ada lagi batu yang akan dijatuhkan dan tidak ada batu yang masih jatuh. Lalu gelombang berikutnya dimulai dengan satu batu tambahan:

if to_spawn == 0 and not rocks:
    wave += 1
    to_spawn = wave + 2

not rocks bernilai true untuk list kosong. Gelombang 1 menjatuhkan 3 batu, gelombang 2 menjatuhkan 4 batu, gelombang 3 menjatuhkan 5 batu.

Tantangan

Sulit

Di reset(), atur wave = 1 dan to_spawn = 3.
Jatuhkan batu saat SPAWN hanya jika to_spawn lebih dari 0, lalu kurangi nilainya.
Di play_frame(), setelah menghapus batu yang sudah keluar: saat to_spawn bernilai 0 dan rocks kosong, tambahkan 1 ke wave dan atur to_spawn = wave + 2.
Tampilkan Wave 1, Wave 2, dan seterusnya dengan midtop=(240, 10).

Coba sendiri

import random
import pygame

pygame.init()
screen = pygame.display.set_mode((480, 360))
pygame.display.set_caption("Meteor Dodge")
clock = pygame.time.Clock()
heart = pygame.image.load("assets/images/heart.png").convert_alpha()
heart_empty = pygame.image.load("assets/images/heart_empty.png").convert_alpha()
font = pygame.font.Font("assets/fonts/pixel.ttf", 24)
big_font = pygame.font.Font("assets/fonts/pixel.ttf", 48)
WHITE = (240, 240, 240)
PLATE = (60, 60, 90)
POINT = pygame.USEREVENT + 1
SPAWN = pygame.USEREVENT + 2


def reset():
    global player, rocks, score, lives, hit_time
    player = pygame.Rect(220, 300, 40, 40)
    rocks = []
    score = 0
    lives = 3
    hit_time = -2000
    pygame.time.set_timer(POINT, 1000)
    pygame.time.set_timer(SPAWN, 800)


def draw_menu():
    screen.fill((30, 30, 46))
    title = big_font.render("Meteor Dodge", True, WHITE)
    title_rect = title.get_rect(center=(240, 140))
    pygame.draw.rect(screen, PLATE, title_rect.inflate(24, 12))
    screen.blit(title, title_rect)
    hint = font.render("Press Enter to play", True, WHITE)
    screen.blit(hint, hint.get_rect(center=(240, 200)))


def draw_game():
    screen.fill((30, 30, 46))
    safe = pygame.time.get_ticks() - hit_time < 1000
    if not safe or pygame.time.get_ticks() // 100 % 2 == 0:
        pygame.draw.rect(screen, (255, 196, 0), player)
    for rock in rocks:
        pygame.draw.rect(screen, (235, 80, 80), rock)
    score_text = font.render(f"{score:05}", True, WHITE)
    score_rect = score_text.get_rect(topright=(470, 10))
    pygame.draw.rect(screen, PLATE, score_rect.inflate(12, 8))
    screen.blit(score_text, score_rect)
    for i in range(3):
        if i < lives:
            screen.blit(heart, (10 + i * 40, 10))
        else:
            screen.blit(heart_empty, (10 + i * 40, 10))


def play_frame():
    global score, lives, state, hit_time, rocks
    keys = pygame.key.get_pressed()
    if keys[pygame.K_LEFT]:
        player.x -= 6
    if keys[pygame.K_RIGHT]:
        player.x += 6
    player.clamp_ip(screen.get_rect())

    for rock in rocks:
        rock.y += 4
    rocks = [rock for rock in rocks if rock.top <= 360]
    now = pygame.time.get_ticks()
    for rock in rocks:
        if rock.colliderect(player) and now - hit_time > 1000:
            hit_time = now
            lives -= 1
            if lives == 0:
                state = "over"
    draw_game()


def draw_over():
    draw_game()
    message = big_font.render("Game over", True, WHITE)
    screen.blit(message, message.get_rect(center=(240, 160)))
    hint = font.render("Press R to play again", True, WHITE)
    screen.blit(hint, hint.get_rect(center=(240, 200)))


reset()
state = "menu"

running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        if event.type == POINT and state == "play":
            score += 1
        if event.type == SPAWN and state == "play":
            rocks.append(pygame.Rect(random.randint(0, 456), -24, 24, 24))
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_RETURN and state == "menu":
                state = "play"
            elif event.key == pygame.K_r and state == "over":
                reset()
                state = "play"

    if state == "menu":
        draw_menu()
    elif state == "play":
        play_frame()
    else:
        draw_over()
    pygame.display.flip()
    clock.tick(60)

pygame.quit()