sprites.py

# Sprite classes
from settings import *
import pygame
from random import choice

vec = pygame.math.Vector2


class SpriteSheet:
    # utility class for loading and parsing spritesheets
    def __init__(self, filename):
        self.spritesheet1 = pygame.image.load(filename).convert()
        self.spritesheet1 = pygame.image.load(filename).convert()

    def get_image(self, x, y, width, height):
        # grab single image out of a spritesheet
        image = pygame.Surface((width, height))
        image.blit(self.spritesheet1, (0, 0), (x, y, width, height))
        image = pygame.transform.scale(image, (width // 2, height // 2))
        return image


class Player(pygame.sprite.Sprite):
    def __init__(self, game):
        pygame.sprite.Sprite.__init__(self)
        self.game = game
        self.walking = False
        self.jumping = False
        self.current_frame = 0
        self.last_update = 0
        self.load_images()
        self.image = self.standing_frames[0]
        self.image.set_colorkey((0, 0, 0))
        self.rect = self.image.get_rect()
        self.rect.center = (width / 2, height / 2)
        self.pos = vec(width / 2, height / 2)  # x and y position
        self.vel = vec(0, 0)  # velocity in x and y axis
        self.acc = vec(0, 0)  # acceleration in x and y axis

    def load_images(self):
        self.standing_frames = [self.game.spritesheet1.get_image(67, 190, 66, 92),
                                self.game.spritesheet1.get_image(0, 190, 66, 92)]
        for frame in self.standing_frames:
            frame.set_colorkey((0, 0, 0))
        self.walk_frames_r = [self.game.spritesheet1.get_image(0, 0, 70, 94),
                              self.game.spritesheet1.get_image(71, 0, 70, 94),
                              self.game.spritesheet1.get_image(142, 0, 70, 94),
                              self.game.spritesheet1.get_image(0, 95, 70, 94),
                              self.game.spritesheet1.get_image(71, 95, 70, 94),
                              self.game.spritesheet1.get_image(142, 95, 70, 94),
                              self.game.spritesheet1.get_image(213, 0, 70, 94),
                              self.game.spritesheet1.get_image(284, 0, 70, 94),
                              self.game.spritesheet1.get_image(213, 95, 70, 94),
                              self.game.spritesheet1.get_image(355, 0, 70, 94),
                              self.game.spritesheet1.get_image(284, 95, 70, 94)]
        self.walk_frames_l = []
        for frame in self.walk_frames_r:
            self.walk_frames_l.append(pygame.transform.flip(frame, True, False))
            frame.set_colorkey((0, 0, 0))
        for frame in self.walk_frames_l:
            frame.set_colorkey((0, 0, 0))
        self.jump_frame_r = self.game.spritesheet1.get_image(423, 95, 66, 94)
        self.jump_frame_r.set_colorkey((0, 0, 0))
        self.jump_frame_l = pygame.transform.flip(self.jump_frame_r, True, False)
        self.jump_frame_l.set_colorkey((0, 0, 0))

    def jump(self):
        # jump only if standing on a platform
        self.rect.y += 2
        hits = pygame.sprite.spritecollide(self, self.game.platforms, False)
        self.rect.y -= 2
        if hits and not self.jumping:
            self.game.jump_sound.play()
            self.jumping = True
            self.vel.y = -player_jump


    def jump_cut(self):
        if self.jumping:
            if self.vel.y < -3:
                self.vel.y = -3

    def update(self):
        self.animate()
        self.acc = vec(0, player_gravity)
        keys = pygame.key.get_pressed()
        if keys[pygame.K_LEFT]:
            self.acc.x = -player_acc
        if keys[pygame.K_RIGHT]:
            self.acc.x = player_acc

        # applies friction
        self.acc.x += self.vel.x * player_friction
        # equations of motion
        self.vel += self.acc
        if abs(self.vel.x) < 0.1:
            self.vel.x = 0
        self.pos += self.vel + 0.5 * self.acc

        self.rect.midbottom = self.pos

    def animate(self):
        now = pygame.time.get_ticks()
        if self.vel.x != 0:
            self.walking = True
        else:
            self.walking = False
        if self.walking:
            if (now - self.last_update) > 100:
                self.last_update = now
                self.current_frame = (self.current_frame + 1) % len(self.walk_frames_l)
                bottom = self.rect.bottom
                if self.vel.x > 0:
                    self.image = self.walk_frames_r[self.current_frame]
                else:
                    self.image = self.walk_frames_l[self.current_frame]
                self.rect = self.image.get_rect()
                self.rect.bottom = bottom
        if not self.jumping and not self.walking:
            if (now - self.last_update) > 400:
                self.last_update = now
                self.current_frame = (self.current_frame + 1) % len(self.standing_frames)
                bottom = self.rect.bottom
                self.image = self.standing_frames[self.current_frame]
                self.rect = self.image.get_rect()
                self.rect.bottom = bottom


class Platform(pygame.sprite.Sprite):
    def __init__(self, game, x, y):
        pygame.sprite.Sprite.__init__(self)
        self.game = game
        images = [self.game.spritesheet2.get_image(576, 792, 70, 70),
                  self.game.spritesheet2.get_image(720, 792, 70, 70)]
        self.image = choice(images)
        self.image.set_colorkey((0, 0, 0))
        self.rect = self.image.get_rect()
        self.rect.x = x
        self.rect.y = y