Pygame鼠标点击检测

Question

我想知道如何编写检测鼠标点击精灵的代码。例如：

if #Function that checks for mouse clicked on Sprite:
    print ("You have opened a chest!")

Answer 1

The pygame documentation for mouse events is here.

您可以将pygame.mouse.get_pressed 方法与pygame.mouse.get_pos 结合使用（如果需要）。

请记住通过主事件循环使用鼠标单击事件。事件循环更好的原因是“短点击”。在普通机器上您可能不会注意到这些，但在触控板上使用轻击点击的计算机的点击周期过短。使用鼠标事件可以防止这种情况发生。

编辑： 要执行像素完美碰撞，请使用their docs for sprites 上的pygame.sprite.collide_rect()。

Answer 2

我假设你的游戏有一个主循环，你所有的精灵都在一个名为sprites的列表中。

在您的主循环中，获取所有事件，并检查 MOUSEBUTTONDOWN 或 MOUSEBUTTONUP 事件。

while ... # your main loop
  # get all events
  ev = pygame.event.get()

  # proceed events
  for event in ev:

    # handle MOUSEBUTTONUP
    if event.type == pygame.MOUSEBUTTONUP:
      pos = pygame.mouse.get_pos()

      # get a list of all sprites that are under the mouse cursor
      clicked_sprites = [s for s in sprites if s.rect.collidepoint(pos)]
      # do something with the clicked sprites...

所以基本上你必须在主循环的每次迭代中自己检查一个精灵的点击。你会想要使用mouse.get_pos() 和rect.collidepoint()。

Pygame 不提供事件驱动编程，例如cocos2d 会。

另一种方法是检查鼠标光标的位置和按下按钮的状态，但这种方法存在一些问题。

if pygame.mouse.get_pressed()[0] and mysprite.rect.collidepoint(pygame.mouse.get_pos()):
  print ("You have opened a chest!")

如果你处理这种情况，你必须引入某种标志，否则这段代码将打印“你已经打开了一个箱子！”主循环的每次迭代。

handled = False

while ... // your loop

  if pygame.mouse.get_pressed()[0] and mysprite.rect.collidepoint(pygame.mouse.get_pos()) and not handled:
    print ("You have opened a chest!")
    handled = pygame.mouse.get_pressed()[0]

当然你可以继承Sprite 并添加一个名为is_clicked 的方法，如下所示：

class MySprite(Sprite):
  ...

  def is_clicked(self):
    return pygame.mouse.get_pressed()[0] and self.rect.collidepoint(pygame.mouse.get_pos())

所以，恕我直言，最好使用第一种方法。

Answer 3

我一直在寻找这个问题的相同答案，经过一番摸索，这是我想出的答案：

# Python 3.4.3 with Pygame
from sys import exit
import pygame
pygame.init()

WIDTH = HEIGHT = 300
window = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption('Crash!')

# Draw Once
rectangle = pygame.draw.rect(window, (255, 0, 0), (100, 100, 100, 100))
pygame.display.update()

# Main Loop
while True:
    # Mouse position and button clicking
    pos = pygame.mouse.get_pos()
    pressed1 = pygame.mouse.get_pressed()[0]

    # Check if rectangle collided with pos and if the left mouse button was pressed
    if rectangle.collidepoint(pos) and pressed1:
        print("You have opened a chest!")

    # Quit pygame
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            exit()

Answer 4

单击鼠标按钮时会发生一次MOUSEBUTTONDOWN 事件，松开鼠标按钮时会发生一次MOUSEBUTTONUP 事件。 pygame.event.Event() 对象有两个属性提供有关鼠标事件的信息。 pos 是一个存储被点击位置的元组。 button 存储被点击的按钮。每个鼠标按钮都关联一个值。例如，鼠标左键、鼠标中键、鼠标右键、鼠标滚轮向上和鼠标滚轮向下的属性值为 1、2、3、4、5。当按下多个键时，会发生多个鼠标按钮事件。进一步的解释可以在模块pygame.event的文档中找到。

使用pygame.sprite.Sprite 对象的rect 属性和collidepoint 方法查看Sprite 是否被点击。 将事件列表传递给pygame.sprite.Group 的update 方法，以便您可以在Sprite 类中处理事件：

class SpriteObject(pygame.sprite.Sprite):
    # [...]

    def update(self, event_list):

        for event in event_list:
            if event.type == pygame.MOUSEBUTTONDOWN:
                if self.rect.collidepoint(event.pos):
                    # [...]

my_sprite = SpriteObject()
group = pygame.sprite.Group(my_sprite)

# [...]

run = True
while run:
    event_list = pygame.event.get()
    for event in event_list:
        if event.type == pygame.QUIT:
            run = False 

    group.update(event_list)

    # [...]

最小示例： repl.it/@Rabbid76/PyGame-MouseClick

import pygame

class SpriteObject(pygame.sprite.Sprite):
    def __init__(self, x, y, color):
        super().__init__() 
        self.original_image = pygame.Surface((50, 50), pygame.SRCALPHA)
        pygame.draw.circle(self.original_image, color, (25, 25), 25)
        self.click_image = pygame.Surface((50, 50), pygame.SRCALPHA)
        pygame.draw.circle(self.click_image, color, (25, 25), 25)
        pygame.draw.circle(self.click_image, (255, 255, 255), (25, 25), 25, 4)
        self.image = self.original_image 
        self.rect = self.image.get_rect(center = (x, y))
        self.clicked = False

    def update(self, event_list):
        for event in event_list:
            if event.type == pygame.MOUSEBUTTONDOWN:
                if self.rect.collidepoint(event.pos):
                    self.clicked = not self.clicked

        self.image = self.click_image if self.clicked else self.original_image

pygame.init()
window = pygame.display.set_mode((300, 300))
clock = pygame.time.Clock()

sprite_object = SpriteObject(*window.get_rect().center, (128, 128, 0))
group = pygame.sprite.Group([
    SpriteObject(window.get_width() // 3, window.get_height() // 3, (128, 0, 0)),
    SpriteObject(window.get_width() * 2 // 3, window.get_height() // 3, (0, 128, 0)),
    SpriteObject(window.get_width() // 3, window.get_height() * 2 // 3, (0, 0, 128)),
    SpriteObject(window.get_width() * 2// 3, window.get_height() * 2 // 3, (128, 128, 0)),
])

run = True
while run:
    clock.tick(60)
    event_list = pygame.event.get()
    for event in event_list:
        if event.type == pygame.QUIT:
            run = False 

    group.update(event_list)

    window.fill(0)
    group.draw(window)
    pygame.display.flip()

pygame.quit()
exit()

进一步查看Creating multiple sprites with different update()'s from the same sprite class in Pygame

---

可以通过pygame.mouse.get_pos() 确定鼠标的当前位置。返回值是一个元组，表示鼠标光标的 x 和 y 坐标。 pygame.mouse.get_pressed() 返回一个布尔值列表，代表所有鼠标按钮的状态（True 或False）。只要按下按钮，按钮的状态就是True。当按下多个按钮时，列表中的多个项目为True。列表中的第 1、2、3 个元素分别代表鼠标左键、中键和右键。

Detect 在pygame.sprite.Sprite 对象的Update 方法中评估鼠标状态：

class SpriteObject(pygame.sprite.Sprite):
    # [...]

    def update(self, event_list):

        mouse_pos = pygame.mouse.get_pos()
        mouse_buttons = pygame.mouse.get_pressed()

        if  self.rect.collidepoint(mouse_pos) and any(mouse_buttons):
            # [...]

my_sprite = SpriteObject()
group = pygame.sprite.Group(my_sprite)

# [...]

run = True
while run:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    group.update(event_list)

    # [...]

最小示例： repl.it/@Rabbid76/PyGame-MouseHover

import pygame

class SpriteObject(pygame.sprite.Sprite):
    def __init__(self, x, y, color):
        super().__init__() 
        self.original_image = pygame.Surface((50, 50), pygame.SRCALPHA)
        pygame.draw.circle(self.original_image, color, (25, 25), 25)
        self.hover_image = pygame.Surface((50, 50), pygame.SRCALPHA)
        pygame.draw.circle(self.hover_image, color, (25, 25), 25)
        pygame.draw.circle(self.hover_image, (255, 255, 255), (25, 25), 25, 4)
        self.image = self.original_image 
        self.rect = self.image.get_rect(center = (x, y))
        self.hover = False

    def update(self):
        mouse_pos = pygame.mouse.get_pos()
        mouse_buttons = pygame.mouse.get_pressed()

        #self.hover = self.rect.collidepoint(mouse_pos)
        self.hover = self.rect.collidepoint(mouse_pos) and any(mouse_buttons)

        self.image = self.hover_image if self.hover else self.original_image

pygame.init()
window = pygame.display.set_mode((300, 300))
clock = pygame.time.Clock()

sprite_object = SpriteObject(*window.get_rect().center, (128, 128, 0))
group = pygame.sprite.Group([
    SpriteObject(window.get_width() // 3, window.get_height() // 3, (128, 0, 0)),
    SpriteObject(window.get_width() * 2 // 3, window.get_height() // 3, (0, 128, 0)),
    SpriteObject(window.get_width() // 3, window.get_height() * 2 // 3, (0, 0, 128)),
    SpriteObject(window.get_width() * 2// 3, window.get_height() * 2 // 3, (128, 128, 0)),
])

run = True
while run:
    clock.tick(60)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False 

    group.update()

    window.fill(0)
    group.draw(window)
    pygame.display.flip()

pygame.quit()
exit()