Question

我需要在一些文本后面画一个圆圈。

在棋盘上，我设法显示了三个字母：一个用于长枪兵的P，一个用于骑士的K以及一个用于弓箭手的A。

此刻，我正试图在棋盘上的某个地方显示一个圆圈，一旦我能实际看到它，我将传递正确的坐标。

这些字母是红色的，仅用于测试目的，但是将来，它们将是黑色或白色。因此需要一个圆圈，这样我才能在黑色正方形上看到黑色字母。

我不在乎圆现在是什么颜色，但我也考虑不实际填充圆，而是画轮廓。

Unit是父类，而Pikeman，Archer和Knight是子类。我宁愿从Unit类中画出一个圆，因为这是三个子类共有的一个“变量”（如果需要）。

我试图在Unit类中创建一个曲面，然后从那里绘制一个圆。无法使其正常工作。

我试图在Unit类内部创建一个表面，并从子类中绘制它。无法使其正常工作。

因此，我决定创建一个CircleSurface类，创建该类的实例并将其传递给draw方法。不，不行！

正如我所说，我宁愿从Unit类中绘制圆，也不必创建CircleSurface类。

import pygame
import sys
from coordinator import coordinator

# Sets up the display
pygame.init()
window_size = (800, 800)
game_window = pygame.display.set_mode(size=window_size)
pygame.display.set_caption('My Game')


# Defines classes and related methods
class WhiteSquare:
    def __init__(self):
        self.height = int(window_size[0] / 8)
        self.width = int(window_size[1] / 8)
        self.white_square = pygame.Surface((self.height, self.width))
        self.white_square.fill((255, 255, 255))


class BlackSquare:
    def __init__(self):
        self.height = int(window_size[0] / 8)
        self.width = int(window_size[1] / 8)
        self.black_square = pygame.Surface((self.height, self.width))
        self.black_square.fill((0, 0, 0))


class ChessBoard:
    def __init__(self):
        self.ws = ws
        self.bs = bs
        self.white_columns = white_columns
        self.black_columns = black_columns

    def draw(self):
        for w_columns in self.white_columns:
            game_window.blit(self.ws.white_square, w_columns)

        for b_columns in self.black_columns:
            game_window.blit(self.bs.black_square, b_columns)


# class SquareNames:
#     letters = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H']
#     numbers = ['1', '2', '3', '4', '5', '6', '7', '8']
#     square_names = []
#     for letter in letters:
#         for number in numbers:
#             square_name = letter + number
#             square_names.append(square_name)
#     print((square_names))
#     # for coordinate in
#     # coordinates = (square_name : coordinate)

class CircleSurface:
    def __init__(self):
        self.circle_surface = pygame.Surface((100, 100))
        self.circle_surface.fill((0, 0, 255))


class Unit:
    def __init__(self):
        self.surface = pygame.Surface((100, 100))
        self.my_font = pygame.font.SysFont('Time New Roman', 100)
        self.cs = cs

    def draw_circle(self):
        pygame.draw.circle(self.cs.circle_surface, (0, 255, 0), (200, 200), 50)


class Pikeman(Unit):
    unit_type = 'P'
    destination = (125, 125)

    def __init__(self):
        super().__init__()
        self.img = self.my_font.render(self.unit_type, 1, (255, 0, 0))

    def draw(self, surface):
        surface.blit(self.img, self.destination)


class Archer(Unit):
    unit_type = 'A'
    destination = (525, 525)

    def __init__(self):
        super().__init__()
        self.img = self.my_font.render(self.unit_type, 1, (255, 0, 0))

    def draw(self, surface):
        surface.blit(self.img, self.destination)


class Knight(Unit):
    unit_type = 'K'
    destination = (325, 525)

    def __init__(self):
        super().__init__()
        self.img = self.my_font.render(self.unit_type, 1, (255, 0, 0))

    def draw(self, surface):
        surface.blit(self.img, self.destination)


# Sets and gets the coordinates for black and white squares
coordinator = coordinator()
black_columns = coordinator[2] + coordinator[3]
white_columns = coordinator[0] + coordinator[1]

# Creates needed objects
ws = WhiteSquare()
bs = BlackSquare()
cb = ChessBoard()
p = Pikeman()
a = Archer()
k = Knight()
cs = CircleSurface()


# Event loop (outer)
while 1:

    # Event loop (inner)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
    # Draws needed objects and updates display
    cb.draw()
    p.draw(game_window)
    p.draw_circle()
    k.draw(game_window)
    a.draw(game_window)
    pygame.display.update()

显示的错误如下：

Traceback (most recent call last):
  File "C:/Users/oricc/PycharmProjects/designAChessboardChallange/display.py", line 117, in <module>
    p = Pikeman()
  File "C:/Users/oricc/PycharmProjects/designAChessboardChallange/display.py", line 77, in __init__
    super().__init__()
  File "C:/Users/oricc/PycharmProjects/designAChessboardChallange/display.py", line 66, in __init__
    self.cs = cs
NameError: name 'cs' is not defined

Answer 1

在构造cs，Pikeman和Archer的实例时，未定义对象Knight。

只需创建CircleSurface的实例即可解决此问题。例如：

cs = CircleSurface()
p = Pikeman()
a = Archer()
k = Knight()

但是我建议将CircleSurface对象作为参数传递：

class Unit:
    def __init__(self, cs):
        self.surface = pygame.Surface((100, 100))
        self.my_font = pygame.font.SysFont('Time New Roman', 100)
        self.cs = cs

    def draw_circle(self):
        pygame.draw.circle(self.cs.circle_surface, (0, 255, 0), (200, 200), 50)

class Pikeman(Unit):
    unit_type = 'P'
    destination = (125, 125)

    def __init__(self, cs):
        super().__init__(cs)
        self.img = self.my_font.render(self.unit_type, 1, (255, 0, 0))

    def draw(self, surface):
        surface.blit(self.img, self.destination)

cs = CircleSurface()
p = Pikeman(cs)

对Archer和Knight做同样的事情。

此外，您还必须确保圆形表面的像素格式将包含每个像素的Alpha，并且必须在圆形表面上绘制圆形：

class CircleSurface:
    def __init__(self):
        self.circle_surface = pygame.Surface((100, 100), flags=pygame.SRCALPHA)
        self.circle_surface.fill((0, 0, 0, 0))
        pygame.draw.circle(self.circle_surface, (0, 255, 0), (50, 50), 50)

blit相对于窗口表面的圆形表面

class Unit:
    # [...]

    def draw_circle(self, surface):
        surface.blit(self.cs.circle_surface, (200, 200))

p.draw_circle(game_window)

绘制圆不显示

1 个答案: