Python Turtle Tile类Bug

Question

我正在使用this answer中的代码，用Python Turtle Graphics制作可点击的编号瓦片。由于某些原因，我的代码创建了具有第二个平铺集(红色)而不是第一个平铺集(蓝色)的颜色的平铺，而这些平铺的文本是相同的。

我试着检查不同颜色的瓷砖是否以某种方式引用了同一个对象，但似乎不是这样。有没有人能告诉我怎么解决这个问题？

from tileset_so import TileSet
from turtle import Screen

SIZE = 4
screen = Screen()

# Tiles
tileset1 = TileSet(background_color="blue")
tileset2 = TileSet(background_color="red")

tiles1 = []
tiles2 = []

blue_tile = tileset1.make_tile("here")
red_tile = tileset2.make_tile("here") # works fine with "there"
blue_tile.goto(100, 100)
red_tile.goto(-100, 100)

print(id(blue_tile), id(red_tile))
print(id(tileset1), id(tileset2))

screen.mainloop()

# tileset.py

from turtle import Screen, Turtle, Shape
from PIL import Image, ImageDraw, ImageFont, ImageTk

DEFAULT_FONT_FILE = "C:\Windows\Fonts\courbd.ttf"  # adjust for your system
DEFAULT_POINT_SIZE = 32
DEFAULT_OUTLINE_SIZE = 1
DEFAULT_OUTLINE_COLOR = 'black'
DEFAULT_BACKGROUND_COLOR = 'white'

class Tile(Turtle):
    def __init__(self, shape, size):
        super().__init__(shape)
        self.penup()

        self.size = size

    def tile_size(self):
        return self.size

class TileSet():

    def __init__(self, font_file=DEFAULT_FONT_FILE, point_size=DEFAULT_POINT_SIZE, background_color=DEFAULT_BACKGROUND_COLOR, outline_size=DEFAULT_OUTLINE_SIZE, outline_color=DEFAULT_OUTLINE_COLOR):
        self.font = ImageFont.truetype(font_file, point_size)
        self.image = Image.new("RGB", (point_size, point_size))
        self.draw = ImageDraw.Draw(self.image)

        self.background_color = background_color
        self.outline_size = outline_size
        self.outline_color = outline_color

    def register_image(self, string):
        width, height = self.draw.textsize(string, font=self.font)
        image = Image.new("RGB", (width + self.outline_size*2, height + self.outline_size*2), self.background_color)
        draw = ImageDraw.Draw(image)
        tile_size = (width + self.outline_size, height + self.outline_size)
        draw.rectangle([(0, 0), tile_size], outline=self.outline_color)
        draw.text((0, 0), string, font=self.font, fill="#000000")
        photo_image = ImageTk.PhotoImage(image)
        shape = Shape("image", photo_image)
        Screen()._shapes[string] = shape  # underpinning, not published API

        return tile_size

    def make_tile(self, string):
        tile_size = self.register_image(string)
        return Tile(string, tile_size)

Answer 1

Screen()._shapes[string] = shape  # underpinning, not published API
                                                  ^^^^^^^^^^^^^^^^^

那么当它的行为与你期望的不同时，你就不会抱怨了，对吧？

Screen()实例是单例的。因此，每次到达此行时，都会对相同的字典进行此赋值。因此，如果这两个瓦片-即使在不同的瓦片集中-具有相同的名称，那么第二个瓦片将替换本词典中的第一个瓦片。

至于为什么这很重要，我想，我们必须看一下最初让你产生写这行的想法的地方。

Answer 2

这里有一个解决方法:将TileSet代码中的make_tile()更改为：

def make_tile(self, string, id):
    tile_size = self.register_image(string, id)
    return Tile(string + ':' + id, tile_size)

在TileSet register_image函数中更改这两行：

def register_image(self, string):

    Screen()._shapes[string] = shape  # underpinning, not published API

改为：

def register_image(self, string, id):

    Screen()._shapes[string + ':' + id] = shape  # underpinning, not published API

最后，将您对make_tile()的调用更改为包含唯一的描述：

blue_tile = tileset1.make_tile("here", "blue here")
red_tile = tileset2.make_tile("here", "red here")