python - 绘制一个显示直到下次单击的形状

Question

我试图通过用绿色勾勒出棋盘上的棋子来表明棋盘上的棋子已被选中。

当点击特定的图 block 区域时，我设法绘制了轮廓，但轮廓在几毫秒后消失了。

所以，我认为与更新显示有关(我已经在 highlight_tile() 方法中调用的函数)。

这是主循环

for event in pygame.event.get():
    if event.type == pygame.QUIT:
        sys.exit()

    # mouse handling
    for unit in white_army:
        if event.type == pygame.MOUSEBUTTONDOWN:
            mouse_position = pygame.mouse.get_pos()
            if unit.tile_area.collidepoint(mouse_position):
                highlight_tile(unit.tile_area)
            else:
                pygame.display.update()

这里是完整的代码

import pygame
import sys
from coordinator import coordinator

# set 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)


# declare letters and numbers
letters = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H']
numbers = ['1', '2', '3', '4', '5', '6', '7', '8']

# create coordinates
coordinates = []
for item_letter in letters:
    letter = item_letter
    for item_number in numbers:
        number = item_number
        coordinates.append(letter + number)

# create coordinates values components
x_values = []
for number in range(0, 800, 100):
    x = number
    x_values.append(x)

y_values = []
for number in range(0, 800, 100):
    y = number
    y_values.append(y)

# create coordinate values
coordinate_values = []
for x in x_values:
    for y in y_values:
        coordinate_values.append((x, y))

# assign values to coordinates
squares_coordinates = dict(zip(coordinates, coordinate_values))


# Background for units
class CircleSurface:
    def __init__(self):
        self.circle_surface = pygame.Surface((100, 100), flags=pygame.SRCALPHA)
        pygame.draw.circle(self.circle_surface, (255, 0, 0), (50, 50), 45)


# define colours
black = (0, 0, 0)
white = (255, 255, 255)
gold = (153, 153, 0)
green = (0, 255, 0)
dark_green = (0, 200, 0)


class Unit:
    def __init__(self, colour, position):

        # define Unit colour
        self.colour = colour

        # define Unit position
        self.position = position


class Knight(Unit):
    def __init__(self, colour, position):
        # draw circle, inline, and outline
        super().__init__(colour, position)
        self.center_x = position[0]
        self.center_y = position[1]
        self.colour = colour
        self.position = position
        # define tile position
        self.tile_area = pygame.Rect(position[0] - 50, position[1] - 50, 100, 100)

        circle_radius = 40
        self.circle = pygame.draw.circle(game_window, colour, self.position, circle_radius)
        self.circle_outline = pygame.draw.circle(game_window, gold, self.position, circle_radius, 5)
        self.circle_inline = pygame.draw.circle(game_window, gold, self.position, (circle_radius - 7), 2)

        # draw letter
        pygame.font.init()
        my_font_size = 50
        my_font = pygame.font.SysFont('Time New Roman', my_font_size)
        text_surface = my_font.render('K', 1, gold)
        center_text = text_surface.get_rect(center=(self.center_x, self.center_y))
        game_window.blit(text_surface, center_text)


class Archer(Unit):
    def __init__(self, colour, first_point, second_point, third_point):
        self.colour = colour
        self.first_point = first_point
        self.second_point = second_point
        self.third_point = third_point
        self.position = [self.first_point, self.second_point, self.third_point]
        super().__init__(colour, self.position)
        self.center_x = self.second_point[0]
        self.center_y = (self.second_point[1] + ((self.first_point[1] - self.second_point[1]) / 2)) + 10
        self.inline_position = [(self.first_point[0] + 10, self.first_point[1] - 5),
                                (self.second_point[0], self.second_point[1] + 10),
                                (self.third_point[0] - 10, self.third_point[1] - 5)]
        # define_tile_centre
        self.tile_area = pygame.Rect(self.first_point[0] - 10, self.second_point[1] - 10, 100, 100)

        if self.colour == black:
            self.first_point = self.first_point[0], self.first_point[1] - 80
            self.second_point = self.second_point[0], self.second_point[1] + 80
            self.third_point = self.third_point[0], self.third_point[1] - 80
            self.position = [self.first_point, self.second_point, self.third_point]

            self.center_y = (self.second_point[1] + ((self.first_point[1] - self.second_point[1])
                                                     / 2)) - 10
            self.inline_position = [(self.first_point[0] + 10, self.first_point[1] + 5),
                                    (self.second_point[0], self.second_point[1] - 10),
                                    (self.third_point[0] - 10, self.third_point[1] + 5)]
        self.triangle = pygame.draw.polygon(game_window, colour, self.position)
        self.triangle_outline = pygame.draw.polygon(game_window, gold, self.position, 5)
        self.triangle_inline = pygame.draw.polygon(game_window, gold, self.inline_position, 2)

        # draw letter
        pygame.font.init()
        my_font_size = 50
        my_font = pygame.font.SysFont('Time New Roman', my_font_size)
        text_surface = my_font.render('A', 1, gold)
        center_text = text_surface.get_rect(center=(self.center_x, self.center_y))
        game_window.blit(text_surface, center_text)


class Pikeman(Unit):
    def __init__(self, colour, position):

        # draw circle, inline, and outline
        super().__init__(colour, position)
        self.dimension = (80, 80)
        self.center_x = position[0] + self.dimension[0] / 2
        self.center_y = position[1] + self.dimension[1] / 2
        self.colour = colour
        self.position = position

        # define_tile_centre
        self.tile_area = pygame.Rect(position[0] - 10, position[1] - 10, 100, 100)

        self.position_and_dimension = self.position + self.dimension
        self.inline_position_and_dimension = (self.position[0] + 5, self.position[1] + 5),\
                                             (self.dimension[0] - 10, self.dimension[1] - 10)
        self.square = pygame.draw.rect(game_window, colour, self.position_and_dimension, )
        self.square_outline = pygame.draw.rect(game_window, gold, self.position_and_dimension, 5)
        self.square_inline = pygame.draw.rect(game_window, gold, self.inline_position_and_dimension, 2)

        # draw letter
        pygame.font.init()
        my_font_size = 50
        my_font = pygame.font.SysFont('Time New Roman', my_font_size)
        text_surface = my_font.render('P', 1, gold)
        center_text = text_surface.get_rect(center=(self.center_x, self.center_y))
        game_window.blit(text_surface, center_text)


def highlight_tile(tile_area):
    pygame.draw.rect(game_window, dark_green, tile_area, 5)
    pygame.display.update()


# 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()
cs = CircleSurface()


# Event loop (outer)
while 1:

    # Draws the chessboard
    cb.draw()

    # set up white units
    white_knight_1 = Knight(white, (150, 650))
    white_knight_2 = Knight(white, (650, 650))
    white_archer_1 = Archer(white, (210, 790), (250, 710), (290, 790))
    white_archer_2 = Archer(white, (310, 790), (350, 710), (390, 790))
    white_archer_3 = Archer(white, (410, 790), (450, 710), (490, 790))
    white_archer_4 = Archer(white, (510, 790), (550, 710), (590, 790))
    white_pikeman_1 = Pikeman(white, (210, 610))
    white_pikeman_2 = Pikeman(white, (310, 610))
    white_pikeman_3 = Pikeman(white, (410, 610))
    white_pikeman_4 = Pikeman(white, (510, 610))

    white_army = [white_knight_1, white_knight_2,
                  white_archer_1, white_archer_2, white_archer_3, white_archer_4,
                  white_pikeman_1, white_pikeman_2, white_pikeman_3, white_pikeman_4]

    # set up black units
    black_knight_1 = Knight(black, (150, 150))
    black_knight_2 = Knight(black, (650, 150))
    black_archer_1 = Archer(black, (210, 90), (250, 10), (290, 90))
    black_archer_2 = Archer(black, (310, 90), (350, 10), (390, 90))
    black_archer_3 = Archer(black, (410, 90), (450, 10), (490, 90))
    black_archer_4 = Archer(black, (510, 90), (550, 10), (590, 90))
    black_pikeman_1 = Pikeman(black, (210, 110))
    black_pikeman_2 = Pikeman(black, (310, 110))
    black_pikeman_3 = Pikeman(black, (410, 110))
    black_pikeman_4 = Pikeman(black, (510, 110))

    # Event loop (inner)

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()

        # mouse handling
        for unit in white_army:
            if event.type == pygame.MOUSEBUTTONDOWN:
                mouse_position = pygame.mouse.get_pos()
                if unit.tile_area.collidepoint(mouse_position):
                    highlight_tile(unit.tile_area)
                else:
                    pygame.display.update()

    pygame.display.update()

编辑

我设法让它不消失，但现在我希望它在再次单击鼠标时消失。

这里是更新的新代码块

if event.type == pygame.MOUSEBUTTONDOWN:
            for unit in white_army:
                mouse_position = pygame.mouse.get_pos()
                if unit.tile_area.collidepoint(mouse_position):
                    print(mouse_position)
                    highlight_tile(unit.tile_area)

我尝试使用 while 循环，但这只会让游戏崩溃，这看起来不是个好主意。

Answer 1

So, I thought had something to do with updating the display (a function that I am already calling inside the highlight_tile() method)

当然。

创建一个变量 (selected_unit) 来说明当前选择的单位。如果按下鼠标按钮，则清除状态并根据鼠标位置设置新的选择状态。
选择变量后，在主应用程序循环而不是事件循环中突出显示形状。例如:

selected_unit = None
while 1:

    # Draws the chessboard
    cb.draw()

    # set up white units
    # [...] 

    # set up black units
    # [...]

    # Event loop (inner)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()

        # mouse handling
        if event.type == pygame.MOUSEBUTTONDOWN:
            mouse_position = pygame.mouse.get_pos()

            if selected_unit:
                # reset the selection
                selected_unit = None
            else:
                # select a new unit
                for unit in white_army:
                    if unit.tile_area.collidepoint(mouse_position):
                        selected_unit = unit

    # highlight the selected unit
    if selected_unit:
        highlight_tile(selected_unit.tile_area)

    # update the dispaly
    pygame.display.update()