button.py

import pygame.font

class Button:

    def __init__(self, ai_game, msg):
        """ Initialize  button attribute.""" 
        self.screen = ai_game.screen
        self.screen_rect = self.screen.get_rect()

        #set the dimensions and properties of the button. 
        self.width, self.height = 200, 50
        self.button_color = (0,255,0)
        self.text_color = (255,255, 255)
        self.font = pygame.font.SysFont(None, 48)

        #build the button's rect object and center it. 
        self.rect = pygame.Rect(0,0,self.width, self.height)
        self.rect.center = self.screen_rect.center

        #the button message needs to be prepped only once. 
        self._prep_msg(msg)

    def _prep_msg(self, msg):
        """ Turn msg into a rendered image and center text on the button. """ 
        self.msg_image = self.font.render(msg, True, self.text_color, self.button_color)
        self.msg_image_rect = self.msg_image.get_rect()
        self.msg_image_rect.center = self.rect.center


    def draw_button(self):
        #draw blank button and then draw message. 
        self.screen.fill(self.button_color, self.rect)
        self.screen.blit(self.msg_image, self.msg_image_rect)