radioButton.py

import pygame
from pygame.constants import MOUSEBUTTONDOWN,MOUSEBUTTONUP

pygame.init()

class RadioButton:
    def __init__(self,surface: pygame.Surface, position: tuple, color: tuple, radius: int, label: str) -> None:
        super().__init__()

        #out line
        self.position = position
        self.color = color
        self.radius = radius
        self.width = 1
        self.surface = surface

        #center circle
        self.center_circle_proportion = 1.9
        self.center_circle_color = (0,255,0)

        #label
        self.label = label
        self.font = "monospace"
        self.font_size = 25
        self.font_color = (255,255,255)

        #state
        self.on_focus = False
        self.selected = True
        self.label_is_visibel = True

    def mouse_trigger(self, event) -> None:
        if event.type == MOUSEBUTTONDOWN and event.button == 1:
         if self.on_focus: self.selected = not self.selected
   

    def is_on_focus(self, position) -> bool:
        deltaX = (self.position[0] - position[0])**2
        deltaY = (self.position[1] - position[1])**2

        self.on_focus = self.radius > (deltaX + deltaY)**0.5 
        return self.on_focus

    def draw_label(self) -> None:
        text_font = pygame.font.SysFont(self.font, self.font_size)
        text = text_font.render(self.label, 1, self.font_color)
        text_rect = text.get_rect()
        text_rect.topleft = (self.position[0] + self.radius + 10, self.position[1] - self.font_size / 2)
        self.surface.blit(text,text_rect)


    def draw_button(self) -> None:
        if self.label_is_visibel : self.draw_label()

        radius = self.radius + 2 if self.on_focus  else self.radius 

        if self.selected: 
            pygame.draw.circle(self.surface, self.center_circle_color, self.position, radius / self.center_circle_proportion)

        pygame.draw.circle(self.surface, self.color, self.position, radius, self.width)       

    def get_state(self) ->bool:
        return self.selected

    def update(self,mouse_position) -> None:
        self.draw_button()
        self.on_focus = self.is_on_focus(mouse_position)