simplegame.py

import pygame
import random
import sys
pygame.init()
WIDTH=800
HEIGHT=600
RED=(255,0,0)
BLUE=(0,0,255)
YELLOW=(255,165,0)
player_size=50
player_pos=[WIDTH/2,HEIGHT-2*player_size]
BACKGROUND_COLOR=(11,238,207)
enemy_size=50
enemy_position=[random.randint(0,WIDTH-enemy_size),0]
enemy_list=[enemy_position]
SPEED=10
score=0
screen=pygame.display.set_mode((WIDTH,HEIGHT))
game_over=False
clock=pygame.time.Clock()
myFont=pygame.font.SysFont("monospace",35)

def set_level(score):
    global SPEED
    if score<20:
    	SPEED=5
    elif score<40:
    	SPEED=8
    elif score<50:
    	SPEED=12
    elif score<60:
    	SPEED=15
    return SPEED

def drop_enemies(enemy_list):
	delay=random.random()
	if len(enemy_list)<10 and delay<0.1:
		x_pos=random.randint(0,WIDTH-enemy_size)
		y_pos=0
		enemy_list.append([x_pos,y_pos])

def draw_enemies(enemy_list):
	for enemy_position in enemy_list:
		pygame.draw.rect(screen, BLUE,(enemy_position[0],enemy_position[1],enemy_size,enemy_size))

def update_enemy_position(enemy_list):
	global score
	for idx,enemy_position in enumerate(enemy_list):
		if enemy_position[1]>=0 and enemy_position[1]<HEIGHT:
		    enemy_position[1]+=SPEED
		else:
			enemy_list.pop(idx)
			score+=1
	return score
def collision_check(enemy_list,player_pos):
	for enemy_position in enemy_list:
		if detect_collision(enemy_position,player_pos):
			return True
	return False


def detect_collision(player_pos,enemy_position):
	p_x=player_pos[0]
	p_y=player_pos[1]

	e_x=enemy_position[0]
	e_y=enemy_position[1]

	if (e_x >=p_x and e_x<(p_x+player_size)) or (p_x>= e_x and p_x<(e_x+enemy_size)):
		if (e_y>=p_y and e_y<(p_y+player_size)) or (p_y>=e_y and p_y<(e_y+enemy_size)):
			return 	True
	return False
while not game_over:
	for event in pygame.event.get():
		# print(event)
		if event.type==pygame.QUIT:
			sys.exit()

		if event.type==pygame.KEYDOWN:
			x=player_pos[0]
			y=player_pos[1]
			if event.key==pygame.K_RIGHT:
				x+=player_size
			elif event.key==pygame.K_LEFT:
				x -=player_size
			player_pos=[x,y]
	screen.fill(BACKGROUND_COLOR)
	# if enemy_position[1]>=0 and enemy_position[1]<HEIGHT:
	# 	enemy_position[1]+=SPEED
	# else:
	# 	enemy_position[0]=random.randint(0,WIDTH-enemy_size)
	# 	enemy_position[1]=0
	if detect_collision(player_pos,enemy_position):
		game_over=True
		break
	drop_enemies(enemy_list)
	score=update_enemy_position(enemy_list)
	SPEED=set_level(score)
	print(score)
	text="Score:"+str(score)
	label=myFont.render(text,1,YELLOW)
	screen.blit(label,(WIDTH-200,HEIGHT-40))
	if collision_check(enemy_list,player_pos):
		game_over=True
		break
	draw_enemies(enemy_list)
	pygame.draw.rect(screen, RED,(player_pos[0],player_pos[1],player_size,player_size))
	clock.tick(30)
	pygame.display.update()