Question

如果图像检测到鼠标悬停，我需要缩放图像，但是我不知道这样。我认为很难使用pygame.mouse.get_pos()和图像的rect来检测它，因为图像是圆形而不是矩形。即使鼠标位于图像的一角而不触摸它，它也可能检测到鼠标悬停。

Answer 1

您可以使用Pythagorean theorem计算鼠标与圆心之间的距离，也可以仅计算math.hypot。如果距离小于半径，则鼠标和圆会碰撞。

还要为图像创建一个rect，以用作盲点位置，并使其易于获取中心点。

import os
from collections import UserDict


class FolderDict(UserDict):

    def get_absolute_path(self, file_name):
        return os.path.join(self.folder_path, file_name)

    def __init__(self, folder_path, create_new=False):
        super().__init__()
        self._dict = {}
        self.folder_path = folder_path
        if os.path.exists(self.folder_path) and os.path.isdir(self.folder_path):
            for file_name in os.listdir(self.folder_path):
                with open(self.get_absolute_path(file_name), "r") as reader:
                    self[file_name] = reader.read()
        else:
            if create_new:
                os.makedirs(folder_path, exist_ok=True)
            else:
                raise FileNotFoundError("[Errno 2] No such file or directory: '{}'".format(self.folder_path))

    def __getitem__(self, item):
        with open(self.get_absolute_path(item), "r") as reader:
            return reader.read()

    def __setitem__(self, key, value):
        """
        Be careful,it will overwrite the existing file.
        We support w mode not a mode now
        """
        with open(self.get_absolute_path(key), "w") as writer:
            writer.write(value)
        self._dict[key] = value

    def keys(self):
        return self._dict.keys()

    def __iter__(self):
        return iter(self._dict.items())

    def __contains__(self, item):
        return os.path.exists(self.get_absolute_path(item))

    def __missing__(self, key):
        raise FileNotFoundError("[Errno 2] No such file or directory: '{}'".format(self.get_absolute_path(key)))

    def __delitem__(self, key):
        os.remove(self.get_absolute_path(key))

    def get(self, k, default=None):
        return self[k] if k in self else default

    def pop(self, k):
        content = self[k]
        os.remove(self.get_absolute_path(k))
        return content

    def __repr__(self):
        return "FolderDict for folder {}".format(self.folder_path)

    __str__ = __repr__


if __name__ == "__main__":
    d = FolderDict("LALALA", create_new=True)
    d["File1"] = "Content of file 1"
    d["File2"] = "Content of file 2"
    d["File3"] = "Content of file 3"

    for k,v in d:
        print(k,v)
    for k in d.keys():
        print(k)

您还可以使用masks进行像素完美的碰撞检测，如果要处理图片，也可以使用pygame.sprite.collide_circle。

如何在Pygame中检测鼠标悬停在图像上（圆形）

1 个答案: