comment faire des collisions triangulaires avec pygame?

Question

J'essaie de faire un jeu de plateforme dans pygame et j'ai rencontré un problème. Je peux facilement faire des collisions pour les rectangles et les carrés, mais je ne peux pas le faire pour les triangles rectangles. Est-il possible de faire cela même en utilisant pygame? J'ai pensé à simplement enlever un des coins pour le faire mais je ne suis pas au courant de comment faire ceci et je ne trouve aucune information utile nulle part. une personne a suggéré d'utiliser des collisions rectangulaires plus petites pour faire des collisions de triangles, mais cela n'a pas donné l'effet désiré. le code suivant a été fait par quelqu'un d'autre, mais il est fondamentalement la même que la mienne, la seule différence est la mienne a des animations etc et j'ai changé quelques-uns des chiffres dans la physique de saut etc

#! /usr/bin/python 

import pygame 
from pygame import * 

WIN_WIDTH = 800 
WIN_HEIGHT = 640 
HALF_WIDTH = int(WIN_WIDTH/2) 
HALF_HEIGHT = int(WIN_HEIGHT/2) 

DISPLAY = (WIN_WIDTH, WIN_HEIGHT) 
DEPTH = 32 
FLAGS = 0 
CAMERA_SLACK = 30 

def main(): 
    global cameraX, cameraY 
    pygame.init() 
    screen = pygame.display.set_mode(DISPLAY, FLAGS, DEPTH) 
    pygame.display.set_caption("Use arrows to move!") 
    timer = pygame.time.Clock() 

    up = down = left = right = running = False 
    bg = Surface((32,72)) 
    bg.convert() 
    bg.fill(Color("#000000")) 
    entities = pygame.sprite.Group() 
    player = Player(32, 32) 
    platforms = [] 

    x = y = 0 
    level = [ 
     "PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP", 
     "P           P", 
     "P           P", 
     "P           P", 
     "P     PPPPPPPPPPP   P", 
     "P           P", 
     "P           P", 
     "P           P", 
     "P PPPPPPPP        P", 
     "P           P", 
     "P       PPPPPPP   P", 
     "P     PPPPPP     P", 
     "P           P", 
     "P   PPPPPPP       P", 
     "P           P", 
     "P      PPPPPP    P", 
     "P           P", 
     "P PPPPPPPPPPP       P", 
     "P           P", 
     "P     PPPPPPPPPPP    P", 
     "P           P", 
     "P           P", 
     "P           P", 
     "P           P", 
     "PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP",] 
    # build the level 
    for row in level: 
     for col in row: 
      if col == "P": 
       p = Platform(x, y) 
       platforms.append(p) 
       entities.add(p) 
      if col == "E": 
       e = ExitBlock(x, y) 
       platforms.append(e) 
       entities.add(e) 
      x += 32 
     y += 32 
     x = 0 

    total_level_width = len(level[0])*32 
    total_level_height = len(level)*32 
    camera = Camera(complex_camera, total_level_width, total_level_height) 
    entities.add(player) 

    while 1: 
     timer.tick(60) 

     for e in pygame.event.get(): 
      if e.type == QUIT: raise SystemExit, "QUIT" 
      if e.type == KEYDOWN and e.key == K_ESCAPE: 
       raise SystemExit, "ESCAPE" 
      if e.type == KEYDOWN and e.key == K_UP: 
       up = True 
      if e.type == KEYDOWN and e.key == K_DOWN: 
       down = True 
      if e.type == KEYDOWN and e.key == K_LEFT: 
       left = True 
      if e.type == KEYDOWN and e.key == K_RIGHT: 
       right = True 
      if e.type == KEYDOWN and e.key == K_SPACE: 
       running = True 

      if e.type == KEYUP and e.key == K_UP: 
       up = False 
      if e.type == KEYUP and e.key == K_DOWN: 
       down = False 
      if e.type == KEYUP and e.key == K_RIGHT: 
       right = False 
      if e.type == KEYUP and e.key == K_LEFT: 
       left = False 

     # draw background 
     for y in range(32): 
      for x in range(32): 
       screen.blit(bg, (x * 32, y * 32)) 

     camera.update(player) 

     # update player, draw everything else 
     player.update(up, down, left, right, running, platforms) 
     for e in entities: 
      screen.blit(e.image, camera.apply(e)) 

     pygame.display.update() 

class Camera(object): 
    def __init__(self, camera_func, width, height): 
     self.camera_func = camera_func 
     self.state = Rect(0, 0, width, height) 

    def apply(self, target): 
     return target.rect.move(self.state.topleft) 

    def update(self, target): 
     self.state = self.camera_func(self.state, target.rect) 

def simple_camera(camera, target_rect): 
    l, t, _, _ = target_rect 
    _, _, w, h = camera 
    return Rect(-l+HALF_WIDTH, -t+HALF_HEIGHT, w, h) 

def complex_camera(camera, target_rect): 
    l, t, _, _ = target_rect 
    _, _, w, h = camera 
    l, t, _, _ = -l+HALF_WIDTH, -t+HALF_HEIGHT, w, h 

    l = min(0, l)       # stop scrolling at the left edge 
    l = max(-(camera.width-WIN_WIDTH), l) # stop scrolling at the right edge 
    t = max(-(camera.height-WIN_HEIGHT), t) # stop scrolling at the bottom 
    t = min(0, t)       # stop scrolling at the top 
    return Rect(l, t, w, h) 

class Entity(pygame.sprite.Sprite): 
    def __init__(self): 
     pygame.sprite.Sprite.__init__(self) 

class Player(Entity): 
    def __init__(self, x, y): 
     Entity.__init__(self) 
     self.xvel = 0 
     self.yvel = 0 
     self.onGround = False 
     self.image = Surface((32,72)) 
     self.image.fill(Color("#0000FF")) 
     self.image.convert() 
     self.rect = Rect(x, y, 32, 72) 

    def update(self, up, down, left, right, running, platforms): 
     if up: 
      # only jump if on the ground 
      if self.onGround: self.yvel -= 10 
     if down: 
      pass 
     if running: 
      self.xvel = 12 
     if left: 
      self.xvel = -8 
     if right: 
      self.xvel = 8 
     if not self.onGround: 
      # only accelerate with gravity if in the air 
      self.yvel += 0.3 
      # max falling speed 
      if self.yvel > 100: self.yvel = 100 
     if not(left or right): 
      self.xvel = 0 
     # increment in x direction 
     self.rect.left += self.xvel 
     # do x-axis collisions 
     self.collide(self.xvel, 0, platforms) 
     # increment in y direction 
     self.rect.top += self.yvel 
     # assuming we're in the air 
     self.onGround = False; 
     # do y-axis collisions 
     self.collide(0, self.yvel, platforms) 

    def collide(self, xvel, yvel, platforms): 
     for p in platforms: 
      if pygame.sprite.collide_rect(self, p): 
       if isinstance(p, ExitBlock): 
        pygame.event.post(pygame.event.Event(QUIT)) 
       if xvel > 0: 
        self.rect.right = p.rect.left 
        print "collide right" 
       if xvel < 0: 
        self.rect.left = p.rect.right 
        print "collide left" 
       if yvel > 0: 
        self.rect.bottom = p.rect.top 
        self.onGround = True 
        self.yvel = 0 
       if yvel < 0: 
        self.rect.top = p.rect.bottom 


class Platform(Entity): 
    def __init__(self, x, y): 
     Entity.__init__(self) 
     self.image = Surface((32, 32)) 
     self.image.convert() 
     self.image.fill(Color("#DDDDDD")) 
     self.rect = Rect(x, y, 32, 32) 

    def update(self): 
     pass 

class ExitBlock(Platform): 
    def __init__(self, x, y): 
     Platform.__init__(self, x, y) 
     self.image.fill(Color("#0033FF")) 

if __name__ == "__main__": 
    main() 

Answer 1

Il est impossible de implémenter une collision triangulaire avec les méthodes du module pygame. Mais recherche sur le module Pylygon.