能改变造型的金币，改编：lixingqiu

"""
本程序给coin增加一个标志，让它当被收集后会改变造型
"""

import random
import arcade
import os

SPRITE_SCALING = 1

SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
SCREEN_TITLE = "能改变造型的金币译：lixingqiu"
 


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

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

        # 设置工作目录
        file_path = os.path.dirname(os.path.abspath(__file__))
        os.chdir(file_path)

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

        # 设置玩家
        self.score = 0
        self.player_sprite = None

    def setup(self):
        """设置游戏 """

        # Sprite lists
        self.player_list = arcade.SpriteList()
        self.coin_list = arcade.SpriteList()

        # Set up the player
        self.score = 0
        self.player_sprite = arcade.Sprite("images/character.png", 0.5)
        self.player_sprite.center_x = 50
        self.player_sprite.center_y = 50
        self.player_list.append(self.player_sprite)

        for i in range(50):

            # 创建金币实例
            coin = arcade.Sprite("images/coin_01.png", SPRITE_SCALING)
            coin.append_texture( arcade.load_texture("images/bumper.png") )
            coin.width = 30
            coin.height = 30
            coin.changed = False        # 新增的‘改变了’属性

            # 随机放金币
            coin.center_x = random.randrange(SCREEN_WIDTH)
            coin.center_y = random.randrange(SCREEN_HEIGHT)

            # 增加金币到列表
            self.coin_list.append(coin)

        # 隐藏鼠标
        self.set_mouse_visible(False)

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

    def on_draw(self):
        """
        重画所有对象
        """

        # 开始渲染
        arcade.start_render()

        # 画所有角色
        self.coin_list.draw()
        self.player_list.draw()

        # 画文本 
        output = f"Score: {self.score}"
        arcade.draw_text(output, 10, 20, arcade.color.WHITE, 14)

    def on_mouse_motion(self, x, y, dx, dy):
        """
        鼠标移动事件x,y为坐标,dx和dy应该是每次移动的相对距离
        """
        self.player_sprite.center_x = x
        self.player_sprite.center_y = y

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

        # 更新玩家和金币，如坐标等
        self.player_list.update()
        self.coin_list.update()

        # 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)

        # 遍历每个金币，如果碰到就修改它的造型
        for coin in hit_list:
            
            if not coin.changed:        # 如果这枚金币被捡到 
                # 那么就设置新的纹理
                coin.set_texture( 1 )   # 设置为索引为1的纹理
                coin.changed = True
                coin.width = 30
                coin.height = 30
                self.score += 1


def main():
    """ Main method """
    window = MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
    window.setup()
    arcade.run()

if __name__ == "__main__":
    main()