如何在掩模图像上创建鼠标点击事件 [Pygame]

Question

我刚开始学习编程，正在做一个类似于《Cookie Clicker》的游戏，不过有点不同，是关于挖矿的。这个游戏是用python和pygame做的。我有一张岩石的图片，每次点击它的时候，我想把一块石头加到我的游戏库存里。

之前有人帮我设置了一个叫point_collide的东西在我的类里。老实说，我不太明白它是怎么工作的，但它的作用是检测我的鼠标是否在岩石图片的非透明部分。

我希望游戏只有在你点击岩石图片的非透明部分时，才会给你一块石头。我把岩石图片放在屏幕中间。

简短的问题是：我该怎么设置游戏，让它只在我的遮罩图片上注册点击呢？

顺便说一下，我知道先学好编程基础会更好，但我通过直接投入项目学到了很多（这让我更有动力，也比看书有趣多了）。

代码链接：https://www.refheap.com/88634

代码：

import pygame, sys
from pygame.locals import *
from datetime import datetime

if (__name__ == "__main__"):

pygame.init()
pygame.font.init()
pygame.display.set_caption("Miner Click")

clock = pygame.time.Clock()
screen = pygame.display.set_mode((960,600))
width = 960
height = 600

GREEN = (0,255,0)
RED = (255,0,0)
BLUE = (0,0,255)
BLACK = (0,0,0)
WHITE = (255,255,255)
BROWN = (84,27,1) 
GREY = (198,198,198)

greenbg = pygame.image.load("greenbg.jpg").convert()
rockbutton = pygame.image.load("rockbutton.png").convert_alpha()
woodbutton = pygame.image.load("woodbutton.png").convert_alpha()

pygame.mouse.set_visible(True)
pick = pygame.image.load("pick.png").convert_alpha()
axe = pygame.image.load("axesmall.png").convert_alpha()

rockwidth = 544
rockheight = 274

clicks = 0
wood = 0

stonefont = pygame.font.SysFont("verdana", 29, True)
woodfont = pygame.font.SysFont("verdana", 29, True)
clicktext = stonefont.render('Rock: ' +str(clicks), 2, (GREY))
woodtext = woodfont.render('Wood: ' +str(wood), 2, (BROWN))
boxsize = clicktext.get_rect()
RocksX = 125
WoodX = 113

class Rock(pygame.sprite.Sprite):

def __init__(self, color = BLUE, width = 544, height = 274):
    super(Rock, self ).__init__()

    self.image = pygame.Surface((width, height))
    self.set_properties()
    self.image.fill(color)

def set_properties(self):
    self.rect = self.image.get_rect()
    self.origin_x = self.rect.centerx
    self.origin_y = self.rect.centery

def set_position(self, x, y):
    self.rect.x = 250
    self.rect.y = 230

def set_image(self, filename = None):
    if (filename != None):
        self.image = pygame.image.load(filename).convert_alpha()

def point_collide(self, point):
    x, y = point
    x -= self.rect.x
    y -= self.rect.y
    try:
        return self.mask.get_at((x,y))
    except IndexError:
        return False

#below is my clueless attempt at getting it to work
def checkForCursorPressed(x,y):
    if pygame.mouse.get_pressed() and pygame.mouse.get_pos() == (x,y):
        clicks+=1

coordfont = pygame.font.SysFont("verdana", 12, True)
rock_group = pygame.sprite.Group()
rock = Rock()
rock.set_image("rock.png")
rock.set_position(width/2, height/2)
rock_group.add(rock)

while True:
    clock.tick(60)
    screen.fill((255,255,255))
    screen.blit(greenbg, (0,0))
    x,y = pygame.mouse.get_pos()
    coords = x,y
    now = datetime.now()
    date = '%s/%s/%s' % (now.month, now.day, now.year)
    label = coordfont.render("Coordinates: "+str(coords), 1, (GREY))
    date = coordfont.render("Date: "+str(date), 1, (GREY))
    screen.blit(date, (650,10))
    screen.blit(label, (790, 10))
    screen.blit(rockbutton, (25,25))
    screen.blit(woodbutton, (25,100))
    clicktext = stonefont.render(' ' +str(clicks), 2, (GREY))
    woodtext = woodfont.render(' ' +str(wood), 2, (BROWN))
    screen.blit(clicktext, [RocksX,38])
    screen.blit(woodtext, [139,WoodX])
    rock_group.draw(screen)
    screen.blit(pick, (x-10,y-50))
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
           sys.exit()
        elif event.type == KEYDOWN and event.key == K_ESCAPE: 
           sys.exit()


        pygame.display.update()

   #in case i need the below again
   #if x>249 and x<(795) and y>210 and y<(484):

pygame 游戏开发编程基础事件检测库存管理掩模图像鼠标点击事件非透明部分

如何在掩模图像上创建鼠标点击事件 [Pygame]

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