收集金币游戏改善下落例子，译：lixingqiu

"""
收集金币游戏改善下落例子，本程序用角色列表的move方法统一移动金币，实现性能提升。
这个游戏需要arcade模块支持。
"""

import random
import arcade
import os

SPRITE_SCALING = 0.5

SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
SCREEN_TITLE = "收集金币游戏改善下落例子，译：lixingqiu"


class Coin(arcade.Sprite):
    """
    继承自角色类的金币类
    """

    def reset_pos(self):

        # 重置坐标
        self.center_y = random.randrange(SCREEN_HEIGHT + 20,SCREEN_HEIGHT + 100)
        self.center_x = random.randrange(SCREEN_WIDTH)

    def update(self):

        # 更新，这里只做个判断，让它移到最上这去
        if self.top < 0:
            self.reset_pos()


class MyGame(arcade.Window):
    """ Main application class. """

    def __init__(self, width, height, title):

        super().__init__(width, height, title)

        # 设置工作目录 ，可以不要此句
        file_path = os.path.dirname(os.path.abspath(__file__))
        os.chdir(file_path)

        # 角色列表定义
        self.all_sprites_list = None
        self.coin_list = None

        # 定义玩家的相关变量 
        self.score = 0
        self.player_sprite = None

    def start_new_game(self):
        """ 设置与初始化游戏 """

        # 实例化所有角色列表
      
        self.coin_list = arcade.SpriteList()

        # 设置玩家
        self.score = 0
        self.player_sprite = arcade.Sprite("images/character.png",SPRITE_SCALING)
        self.player_sprite.center_x = 50
        self.player_sprite.center_y = 70
       

        for i in range(50):

            # 实例化金币
            coin = Coin("images/coin_01.png", SPRITE_SCALING / 3)

            # 设定金币的坐标
            coin.center_x = random.randrange(SCREEN_WIDTH)
            coin.center_y = random.randrange(SCREEN_HEIGHT)

            # 增加到金币角色列表           
            self.coin_list.append(coin)

        # 不显示鼠标指针
        self.set_mouse_visible(False)

        # 设置背景颜色
        arcade.set_background_color(arcade.color.AMAZON)

    def on_draw(self):
        """
        渲染屏幕
        """

        # 开始渲染，此命令要在所有重画命令之前
        arcade.start_render()

        # 画所有的角色
        self.player_sprite.draw()
        self.coin_list.draw()

 
    def on_mouse_motion(self, x, y, dx, dy):
        """
        鼠标移动时这个方法被自动调用
        """
        self.player_sprite.center_x = x
        self.player_sprite.center_y = y

    def update(self, delta_time):
        """ Movement and game logic """

        # 更新坐标等等
        self.player_sprite.update()
        self.coin_list.update()
        self.coin_list.move(0, -1)

        # 玩家和所有金币的碰撞检测.
        hit_list = \
            arcade.check_for_collision_with_list(self.player_sprite,self.coin_list)

        # 遍历碰到的金币列表
        for coin in hit_list:
            coin.reset_pos()#  金币并没有被删除而是移到了最上边
            self.score += 1 


def main():
    window = MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
    window.start_new_game()
    arcade.run()


if __name__ == "__main__":
    main()