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Pygameで簡単なスペースインベーダーゲームを作る方法

Last updated at Posted at 2020-07-22

#0.はじめに
今回作るものがどういう感じで動くのか見てみたい、この記事を読むのが面倒くさい方はこちら(Youtubeの動画)をご覧ください。長くなってしまったので記事を読んだ方が早いかもしれません。

#1.実装

space_invader.py
import pygame
import math
import numpy as np

win = pygame.display.set_mode((600,400))

class Ship:
    def __init__(self,win):
        self.x = 300
        self.y = 350
        self.width = 20
        self.height = 40
        self.vel = 1
        self.win = win

    def draw(self):
        pygame.draw.rect(self.win,(255,255,255),(self.x,self.y,self.width,self.height),0)

    def move(self,keys):
        if keys[pygame.K_RIGHT] and self.x < 600 - self.width - self.vel:
            self.x += self.vel
        elif keys[pygame.K_LEFT] and self.x > self.vel:
            self.x -= self.vel

class Flower:
    def __init__(self,win,x):
        self.x = x
        self.y = 100
        self.radius = 30
        self.win = win
        self.hitcircle = (self.x,self.y)
        self.xdir = 1
        self.ydir = 0
        self.edge = False
        self.moveloop = 0

    def draw(self):
        pygame.draw.circle(self.win,(255,0,200), (self.x,self.y), self.radius)
        self.hitcircle = (self.x,self.y)

    def grow(self,flower):
        self.radius += 2

    def move(self):
        self.x += self.xdir

    def shiftDown(self):
        self.xdir *= -1
        self.y += self.radius
        self.edge = False


class Drop:
    def __init__(self,win,x):
        self.win = win
        self.y =  350
        self.vel = 10
        self.x = x
        self.r = 8

    def draw(self):
        pygame.draw.rect(self.win,(150,0,255),(self.x,self.y,self.r*2,self.r*2),0)

    def collide(self,drop,flower):
        dist = math.sqrt(np.abs(flower.hitcircle[0]-drop.x)**2+np.abs(flower.hitcircle[1]-drop.y)**2)
        if dist < 38:
            return True
        return False 

def drawWindow(ship,drops):
    ship.draw()

    for i in drops:
        i.draw()

    for b in flowers:
        b.draw()
        b.move()  

    pygame.display.update()

drops = []
flowers = []
shootloop = 0
for i in range(6):
    x = i*80 + 80
    flowers.append(Flower(win,x))
ship = Ship(win)
run = True
while run:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False   
    
    keys = pygame.key.get_pressed()

    if shootloop > 0:
        shootloop += 1
    if shootloop > 20:
        shootloop = 0

    if keys[pygame.K_SPACE] and shootloop == 0:
        if len(drops) <= 10:
            drops.append(Drop(win,ship.x))
        
        shootloop = 1

    for drop in drops:
        if drop.y > 0:
            drop.y -= 1
        else:
            drops.pop(drops.index(drop))    
        
        for flower in flowers:
            if drop.collide(drop,flower):
                flower.grow(flower)
                drops.pop(drops.index(drop))

    for flower in flowers:
        if flower.x > 600 or flower.x < 0:
            flower.edge = True

        if flower.edge:
            flower.shiftDown()

    ship.move(keys)
    win.fill((51,51,51))
    drawWindow(ship,drops)

pygame.quit()

ここでは敵(Flower)、玉(Drop)、自分の船(Ship)の3つのクラスを作って動かしています。船は左右に動き、玉はスペースキーで発射され当たったかどうかの判定もし敵はだんだん近づいて来るようになっています。敵の近づいてくる処理は少し難しいかもしれませんがよく考えて見れば分かると思います。
#最後に
今回作ったものはYoutubeでも解説しているのでそちらも良かったらご覧ください。質問、アドバイスがあればぜひコメントをよろしくお願いします。

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