tiles.py

import sys
import random
import pygame as pg

from string import ascii_uppercase


SCREEN_SIZE = (500, 500)
CAPTION = "Letter Tiles"
BACKGROUND_COLOR = pg.Color("darkslategray")


class LetterTile(pg.sprite.Sprite):
    SIZE = (50, 50)
    
    def __init__(self, letter, pos, *groups):
        super(LetterTile, self).__init__(*groups)
        self.letter = letter
        self.image = self.make_image(letter)
        self.rect = self.image.get_rect(topleft=pos)
        self.clicked = False

    def make_image(self, letter):
        image = pg.Surface(LetterTile.SIZE).convert()
        rect = image.get_rect()
        image.fill(pg.Color("black"))
        image.fill(pg.Color("beige"), rect.inflate(-4, -4))
        letter = FONT.render(letter, True, pg.Color("black"))
        letter_rect =letter.get_rect(center=rect.center)
        image.blit(letter, letter_rect)
        return image

    def check_click(self, pos):
        hit = self.rect.collidepoint(pos)
        self.clicked = hit
        return hit

    def update(self, screen_rect):
        if self.clicked:
            self.rect.move_ip(pg.mouse.get_rel())
        self.rect.clamp_ip(screen_rect)
        
    def draw(self, surface):
        surface.blit(self.image, self.rect)


class App(object):
    def __init__(self):
        self.screen = pg.display.get_surface()
        self.screen_rect = self.screen.get_rect()
        self.clock = pg.time.Clock()
        self.fps = 60
        self.done = False
        self.dragging = False
        self.tiles = self.make_tiles()

    def make_tiles(self):
        tiles = pg.sprite.Group()
        for letter in ascii_uppercase:
            pos = (random.randrange(self.screen_rect.w),
                   random.randrange(self.screen_rect.h))
            LetterTile(letter, pos, tiles)
        return tiles

    def event_loop(self):
        for event in pg.event.get():
            if event.type == pg.QUIT:
                self.done = True
            elif event.type == pg.MOUSEBUTTONDOWN and event.button == 1:
                self.on_mouse_down(event)
            elif event.type == pg.MOUSEBUTTONUP and event.button == 1:
                self.on_mouse_up(event)

    def on_mouse_down(self, event):
        for tile in self.tiles:
            if not self.dragging and tile.check_click(event.pos):
                self.dragging = True
                pg.mouse.get_rel()
                break

    def on_mouse_up(self, event):
        for tile in self.tiles:
            tile.clicked = False
        self.dragging = False

    def update(self):
        self.tiles.update(self.screen_rect)

    def render(self):
        self.screen.fill(BACKGROUND_COLOR)
        self.tiles.draw(self.screen)
        pg.display.update()

    def main_loop(self):
        while not self.done:
            self.event_loop()
            self.update()
            self.render()
            self.clock.tick(self.fps)


def main():
    global FONT
    pg.init()
    pg.display.set_caption(CAPTION)
    pg.display.set_mode(SCREEN_SIZE)
    FONT = pg.font.Font(None, 50)
    App().main_loop()
    pg.quit()
    sys.exit()


if __name__ == "__main__":
    main()