game.py

import pygame, sys, math

def rotate2d(pos, rad):
	x,y = pos
	s,c = math.sin(rad),math.cos(rad)
	return x*c-y*s,y*c+x*s

class Cam:
	def __init__(self, pos=(0,0,0), rot=(0,0)):
		self.pos = list(pos)
		self.rot = list(rot)

	def events(self,event):
		if event.type == pygame.MOUSEMOTION:
			x,y = event.rel
			x/=200; y/=200
			self.rot[0]+=y
			self.rot[1]+=x

	def update(self,dt,key):
		s = dt*10
		
		if key[pygame.K_q]: self.pos[1]-=s
		if key[pygame.K_e]: self.pos[1]+=s
		
		x, y = s*math.sin(self.rot[1]),s*math.cos(self.rot[1])

		if key[pygame.K_w]: self.pos[0]+=x;self.pos[2]+=y
		if key[pygame.K_s]: self.pos[0]-=x;self.pos[2]-=y
		if key[pygame.K_a]: self.pos[0]-=y;self.pos[2]+=x
		if key[pygame.K_d]: self.pos[0]+=y;self.pos[2]-=x
pygame.init()
w, h = 400, 400; cx, cy = w//2, h//2
screen = pygame.display.set_mode((w, h))
clock = pygame.time.Clock()

verts = (-1,-1,-1), (1,-1,-1), (1,1,-1), (-1,1,-1), (-1,-1,1), (1, -1, 1), (1,1,1), (-1,1,1)
edges = (0,1),(1,2),(2,3),(3,0),(4,5),(5,6),(6,7),(7,4),(0,4),(1,5),(2,6),(3,7)

cam = Cam((0,0,-5))

pygame.event.get()
pygame.mouse.get_rel()
pygame.mouse.set_visible(0)
pygame.event.set_grab(1)

while True:
	dt = clock.tick()/1000

	for event in pygame.event.get():
		if event.type == pygame.QUIT: pygame.quit(); sys.exit()
		if event.type == pygame.KEYDOWN:
			if event.key == pygame.K_ESCAPE: pygame.quit(); sys.exit()
		cam.events(event)
	screen.fill((255,255,255))
	
	for edge in edges:
		points = []

		for x,y,z in (verts[edge[0]],verts[edge[1]]):
			x-=cam.pos[0]
			y-=cam.pos[1]
			z-=cam.pos[2]

			x,z = rotate2d((x,z), cam.rot[1])
			y,z = rotate2d((y,z), cam.rot[0])
			f = 200/z
			x,y = x*f,y*f
			points+=[(cx+int(x), cy+int(y))]
		pygame.draw.line(screen, (0,0,0), points[0], points[1], 1)
	pygame.display.flip()
	key = pygame.key.get_pressed()
	cam.update(dt,key)