flappy.py

from itertools import cycle
import random
import sys

import pygame
from pygame.locals import *

import numpy as np

from keras.models import Sequential
from keras.layers import Dense, Activation
from keras.optimizers import SGD

FPS = 30
SCREENWIDTH  = 288.0
SCREENHEIGHT = 512.0
# amount by which base can maximum shift to left
PIPEGAPSIZE  = 100 # gap between upper and lower part of pipe
BASEY        = SCREENHEIGHT * 0.79
# image, sound and hitmask  dicts
IMAGES, SOUNDS, HITMASKS = {}, {}, {}

load_saved_pool = 1
save_current_pool = 1
current_pool = []
fitness = []
total_models = 50

next_pipe_x = -1
next_pipe_hole_y = -1
generation = 1

def save_pool():
    for xi in range(total_models):
        current_pool[xi].save_weights("Current_Model_Pool/model_new" + str(xi) + ".keras")
    print("Saved current pool!")

def model_crossover(model_idx1, model_idx2):
    global current_pool
    weights1 = current_pool[model_idx1].get_weights()
    weights2 = current_pool[model_idx2].get_weights()
    weightsnew1 = weights1
    weightsnew2 = weights2
    weightsnew1[0] = weights2[0]
    weightsnew2[0] = weights1[0]
    return np.asarray([weightsnew1, weightsnew2])

def model_mutate(weights):
    for xi in range(len(weights)):
        for yi in range(len(weights[xi])):
            if random.uniform(0, 1) > 0.85:
                change = random.uniform(-0.5,0.5)
                weights[xi][yi] += change
    return weights

def predict_action(height, dist, pipe_height, model_num):
    global current_pool
    # The height, dist and pipe_height must be between 0 to 1 (Scaled by SCREENHEIGHT)
    height = min(SCREENHEIGHT, height) / SCREENHEIGHT - 0.5
    dist = dist / 450 - 0.5 # Max pipe distance from player will be 450
    pipe_height = min(SCREENHEIGHT, pipe_height) / SCREENHEIGHT - 0.5
    neural_input = np.asarray([height, dist, pipe_height])
    neural_input = np.atleast_2d(neural_input)
    output_prob = current_pool[model_num].predict(neural_input, 1)[0]
    if output_prob[0] <= 0.5:
        # Perform the jump action
        return 1
    return 2

# Initialize all models
for i in range(total_models):
    model = Sequential()
    model.add(Dense(output_dim=7, input_dim=3))
    model.add(Activation("sigmoid"))
    model.add(Dense(output_dim=1))
    model.add(Activation("sigmoid"))

    sgd = SGD(lr=0.01, decay=1e-6, momentum=0.9, nesterov=True)
    model.compile(loss="mse", optimizer=sgd, metrics=["accuracy"])
    current_pool.append(model)
    fitness.append(-100)

if load_saved_pool:
    for i in range(total_models):
        current_pool[i].load_weights("Current_Model_Pool/model_new"+str(i)+".keras")

for i in range(total_models):
    print(current_pool[i].get_weights())

# list of all possible players (tuple of 3 positions of flap)
PLAYERS_LIST = (
    # red bird
    (
        'assets/sprites/redbird-upflap.png',
        'assets/sprites/redbird-midflap.png',
        'assets/sprites/redbird-downflap.png',
    ),
    # blue bird
    (
        # amount by which base can maximum shift to left
        'assets/sprites/bluebird-upflap.png',
        'assets/sprites/bluebird-midflap.png',
        'assets/sprites/bluebird-downflap.png',
    ),
    # yellow bird
    (
        'assets/sprites/yellowbird-upflap.png',
        'assets/sprites/yellowbird-midflap.png',
        'assets/sprites/yellowbird-downflap.png',
    ),
)

# list of backgrounds
BACKGROUNDS_LIST = (
    'assets/sprites/background-day.png',
    'assets/sprites/background-night.png',
)

# list of pipes
PIPES_LIST = (
    'assets/sprites/pipe-green.png',
    'assets/sprites/pipe-red.png',
)


def main():
    global SCREEN, FPSCLOCK
    pygame.init()
    FPSCLOCK = pygame.time.Clock()
    SCREEN = pygame.display.set_mode((int(SCREENWIDTH), int(SCREENHEIGHT)))
    pygame.display.set_caption('Flappy Bird')

    # numbers sprites for score display
    IMAGES['numbers'] = (
        pygame.image.load('assets/sprites/0.png').convert_alpha(),
        pygame.image.load('assets/sprites/1.png').convert_alpha(),
        pygame.image.load('assets/sprites/2.png').convert_alpha(),
        pygame.image.load('assets/sprites/3.png').convert_alpha(),
        pygame.image.load('assets/sprites/4.png').convert_alpha(),
        pygame.image.load('assets/sprites/5.png').convert_alpha(),
        pygame.image.load('assets/sprites/6.png').convert_alpha(),
        pygame.image.load('assets/sprites/7.png').convert_alpha(),
        pygame.image.load('assets/sprites/8.png').convert_alpha(),
        pygame.image.load('assets/sprites/9.png').convert_alpha()
    )

    # game over sprite
    IMAGES['gameover'] = pygame.image.load('assets/sprites/gameover.png').convert_alpha()
    # message sprite for welcome screen
    IMAGES['message'] = pygame.image.load('assets/sprites/message.png').convert_alpha()
    # base (ground) sprite
    IMAGES['base'] = pygame.image.load('assets/sprites/base.png').convert_alpha()

    # sounds
    if 'win' in sys.platform:
        soundExt = '.wav'
    else:
        soundExt = '.ogg'

    SOUNDS['die']    = pygame.mixer.Sound('assets/audio/die' + soundExt)
    SOUNDS['hit']    = pygame.mixer.Sound('assets/audio/hit' + soundExt)
    SOUNDS['point']  = pygame.mixer.Sound('assets/audio/point' + soundExt)
    SOUNDS['swoosh'] = pygame.mixer.Sound('assets/audio/swoosh' + soundExt)
    SOUNDS['wing']   = pygame.mixer.Sound('assets/audio/wing' + soundExt)

    while True:
        # select random background sprites
        randBg = random.randint(0, len(BACKGROUNDS_LIST) - 1)
        IMAGES['background'] = pygame.image.load(BACKGROUNDS_LIST[randBg]).convert()

        # select random player sprites
        randPlayer = random.randint(0, len(PLAYERS_LIST) - 1)
        IMAGES['player'] = (
            pygame.image.load(PLAYERS_LIST[randPlayer][0]).convert_alpha(),
            pygame.image.load(PLAYERS_LIST[randPlayer][1]).convert_alpha(),
            pygame.image.load(PLAYERS_LIST[randPlayer][2]).convert_alpha(),
        )

        # select random pipe sprites
        pipeindex = random.randint(0, len(PIPES_LIST) - 1)
        IMAGES['pipe'] = (
            pygame.transform.rotate(
                pygame.image.load(PIPES_LIST[pipeindex]).convert_alpha(), 180),
            pygame.image.load(PIPES_LIST[pipeindex]).convert_alpha(),
        )

        # hismask for pipes
        HITMASKS['pipe'] = (
            getHitmask(IMAGES['pipe'][0]),
            getHitmask(IMAGES['pipe'][1]),
        )

        # hitmask for player
        HITMASKS['player'] = (
            getHitmask(IMAGES['player'][0]),
            getHitmask(IMAGES['player'][1]),
            getHitmask(IMAGES['player'][2]),
        )

        movementInfo = showWelcomeAnimation()
        global fitness
        for idx in range(total_models):
            fitness[idx] = 0
        crashInfo = mainGame(movementInfo)
        showGameOverScreen(crashInfo)


def showWelcomeAnimation():
    return {
                'playery': int((SCREENHEIGHT - IMAGES['player'][0].get_height()) / 2),
                'basex': 0,
                'playerIndexGen': cycle([0, 1, 2, 1]),
            }


def mainGame(movementInfo):
    global fitness
    score = playerIndex = loopIter = 0
    playerIndexGen = movementInfo['playerIndexGen']
    playersXList = []
    playersYList = []
    for idx in range(total_models):
        playerx, playery = int(SCREENWIDTH * 0.2), movementInfo['playery']
        playersXList.append(playerx)
        playersYList.append(playery)
    basex = movementInfo['basex']
    baseShift = IMAGES['base'].get_width() - IMAGES['background'].get_width()

    # get 2 new pipes to add to upperPipes lowerPipes list
    newPipe1 = getRandomPipe()
    newPipe2 = getRandomPipe()

    # list of upper pipes
    upperPipes = [
        {'x': SCREENWIDTH + 200, 'y': newPipe1[0]['y']},
        {'x': SCREENWIDTH + 200 + (SCREENWIDTH / 2), 'y': newPipe2[0]['y']},
    ]

    # list of lowerpipe
    lowerPipes = [
        {'x': SCREENWIDTH + 200, 'y': newPipe1[1]['y']},
        {'x': SCREENWIDTH + 200 + (SCREENWIDTH / 2), 'y': newPipe2[1]['y']},
    ]

    global next_pipe_x
    global next_pipe_hole_y

    next_pipe_x = lowerPipes[0]['x']
    next_pipe_hole_y = (lowerPipes[0]['y'] + (upperPipes[0]['y'] + IMAGES['pipe'][0].get_height()))/2

    pipeVelX = -4

    # player velocity, max velocity, downward accleration, accleration on flap
    playersVelY    =  []   # player's velocity along Y, default same as playerFlapped
    playerMaxVelY =  10   # max vel along Y, max descend speed
    playerMinVelY =  -8   # min vel along Y, max ascend speed
    playersAccY    =  []   # players downward accleration
    playerFlapAcc =  -9   # players speed on flapping
    playersFlapped = [] # True when player flaps
    playersState = []

    for idx in range(total_models):
        playersVelY.append(-9)
        playersAccY.append(1)
        playersFlapped.append(False)
        playersState.append(True)

    alive_players = total_models


    while True:
        for idxPlayer in range(total_models):
            if playersYList[idxPlayer] < 0 and playersState[idxPlayer] == True:
                alive_players -= 1
                playersState[idxPlayer] = False
        if alive_players == 0:
            return {
                'y': 0,
                'groundCrash': True,
                'basex': basex,
                'upperPipes': upperPipes,
                'lowerPipes': lowerPipes,
                'score': score,
                'playerVelY': 0,
            }
        for idxPlayer in range(total_models):
            if playersState[idxPlayer] == True:
                fitness[idxPlayer] += 1
        next_pipe_x += pipeVelX
        for idxPlayer in range(total_models):
            if playersState[idxPlayer] == True:
                if predict_action(playersYList[idxPlayer], next_pipe_x, next_pipe_hole_y, idxPlayer) == 1:
                    if playersYList[idxPlayer] > -2 * IMAGES['player'][0].get_height():
                        playersVelY[idxPlayer] = playerFlapAcc
                        playersFlapped[idxPlayer] = True
                        #SOUNDS['wing'].play()
        for event in pygame.event.get():
            if event.type == QUIT or (event.type == KEYDOWN and event.key == K_ESCAPE):
                pygame.quit()
                sys.exit()
            """if (event.type == KEYDOWN and (event.key == K_SPACE or event.key == K_UP)):
                if playery > -2 * IMAGES['player'][0].get_height():
                    playerVelY = playerFlapAcc
                    playerFlapped = True
                    SOUNDS['wing'].play()
            """

        # check for crash here, returns status list
        crashTest = checkCrash({'x': playersXList, 'y': playersYList, 'index': playerIndex},
                               upperPipes, lowerPipes)

        for idx in range(total_models):
            if playersState[idx] == True and crashTest[idx] == True:
                alive_players -= 1
                playersState[idx] = False
        if alive_players == 0:
            return {
                'y': playery,
                'groundCrash': crashTest[1],
                'basex': basex,
                'upperPipes': upperPipes,
                'lowerPipes': lowerPipes,
                'score': score,
                'playerVelY': 0,
            }

        # check for score
        for idx in range(total_models):
            if playersState[idx] == True:
                pipe_idx = 0
                playerMidPos = playersXList[idx]
                for pipe in upperPipes:
                    pipeMidPos = pipe['x'] + IMAGES['pipe'][0].get_width()
                    if pipeMidPos <= playerMidPos < pipeMidPos + 4:
                        next_pipe_x = lowerPipes[pipe_idx+1]['x']
                        next_pipe_hole_y = (lowerPipes[pipe_idx+1]['y'] + (upperPipes[pipe_idx+1]['y'] + IMAGES['pipe'][pipe_idx+1].get_height())) / 2
                        score += 1
                        fitness[idx] += 25
                        # SOUNDS['point'].play()
                    pipe_idx += 1

        # playerIndex basex change
        if (loopIter + 1) % 3 == 0:
            playerIndex = next(playerIndexGen)
        loopIter = (loopIter + 1) % 30
        basex = -((-basex + 100) % baseShift)

        # player's movement
        for idx in range(total_models):
            if playersState[idx] == True:
                if playersVelY[idx] < playerMaxVelY and not playersFlapped[idx]:
                    playersVelY[idx] += playersAccY[idx]
                if playersFlapped[idx]:
                    playersFlapped[idx] = False
                playerHeight = IMAGES['player'][playerIndex].get_height()
                playersYList[idx] += min(playersVelY[idx], BASEY - playersYList[idx] - playerHeight)

        # move pipes to left
        for uPipe, lPipe in zip(upperPipes, lowerPipes):
            uPipe['x'] += pipeVelX
            lPipe['x'] += pipeVelX

        # add new pipe when first pipe is about to touch left of screen
        if 0 < upperPipes[0]['x'] < 5:
            newPipe = getRandomPipe()
            upperPipes.append(newPipe[0])
            lowerPipes.append(newPipe[1])

        # remove first pipe if its out of the screen
        if upperPipes[0]['x'] < -IMAGES['pipe'][0].get_width():
            upperPipes.pop(0)
            lowerPipes.pop(0)

        # draw sprites
        SCREEN.blit(IMAGES['background'], (0,0))

        for uPipe, lPipe in zip(upperPipes, lowerPipes):
            SCREEN.blit(IMAGES['pipe'][0], (uPipe['x'], uPipe['y']))
            SCREEN.blit(IMAGES['pipe'][1], (lPipe['x'], lPipe['y']))

        SCREEN.blit(IMAGES['base'], (basex, BASEY))
        # print score so player overlaps the score
        showScore(score)
        for idx in range(total_models):
            if playersState[idx] == True:
                SCREEN.blit(IMAGES['player'][playerIndex], (playersXList[idx], playersYList[idx]))

        pygame.display.update()
        FPSCLOCK.tick(FPS)


def showGameOverScreen(crashInfo):
    """Perform genetic updates here"""
    global current_pool
    global fitness
    global generation
    new_weights = []
    total_fitness = 0
    for select in range(total_models):
        total_fitness += fitness[select]
    for select in range(total_models):
        fitness[select] /= total_fitness
        if select > 0:
            fitness[select] += fitness[select-1]
    for select in range(int(total_models/2)):
        parent1 = random.uniform(0, 1)
        parent2 = random.uniform(0, 1)
        idx1 = -1
        idx2 = -1
        for idxx in range(total_models):
            if fitness[idxx] >= parent1:
                idx1 = idxx
                break
        for idxx in range(total_models):
            if fitness[idxx] >= parent2:
                idx2 = idxx
                break
        new_weights1 = model_crossover(idx1, idx2)
        updated_weights1 = model_mutate(new_weights1[0])
        updated_weights2 = model_mutate(new_weights1[1])
        new_weights.append(updated_weights1)
        new_weights.append(updated_weights2)
    for select in range(len(new_weights)):
        fitness[select] = -100
        current_pool[select].set_weights(new_weights[select])
    if save_current_pool == 1:
        save_pool()
    generation = generation + 1
    return


def getRandomPipe():
    """returns a randomly generated pipe"""
    # y of gap between upper and lower pipe
    gapY = random.randrange(0, int(BASEY * 0.6 - PIPEGAPSIZE))
    gapY += int(BASEY * 0.2)
    pipeHeight = IMAGES['pipe'][0].get_height()
    pipeX = SCREENWIDTH + 10

    return [
        {'x': pipeX, 'y': gapY - pipeHeight},  # upper pipe
        {'x': pipeX, 'y': gapY + PIPEGAPSIZE}, # lower pipe
    ]


def showScore(score):
    """displays score in center of screen"""
    scoreDigits = [int(x) for x in list(str(score))]
    totalWidth = 0 # total width of all numbers to be printed

    for digit in scoreDigits:
        totalWidth += IMAGES['numbers'][digit].get_width()

    Xoffset = (SCREENWIDTH - totalWidth) / 2

    for digit in scoreDigits:
        SCREEN.blit(IMAGES['numbers'][digit], (Xoffset, SCREENHEIGHT * 0.1))
        Xoffset += IMAGES['numbers'][digit].get_width()


def checkCrash(players, upperPipes, lowerPipes):
    """returns True if player collders with base or pipes."""
    statuses = []
    for idx in range(total_models):
        statuses.append(False)

    for idx in range(total_models):
        statuses[idx] = False
        pi = players['index']
        players['w'] = IMAGES['player'][0].get_width()
        players['h'] = IMAGES['player'][0].get_height()
        # if player crashes into ground
        if players['y'][idx] + players['h'] >= BASEY - 1:
            statuses[idx] = True
        playerRect = pygame.Rect(players['x'][idx], players['y'][idx],
                      players['w'], players['h'])
        pipeW = IMAGES['pipe'][0].get_width()
        pipeH = IMAGES['pipe'][0].get_height()

        for uPipe, lPipe in zip(upperPipes, lowerPipes):
            # upper and lower pipe rects
            uPipeRect = pygame.Rect(uPipe['x'], uPipe['y'], pipeW, pipeH)
            lPipeRect = pygame.Rect(lPipe['x'], lPipe['y'], pipeW, pipeH)

            # player and upper/lower pipe hitmasks
            pHitMask = HITMASKS['player'][pi]
            uHitmask = HITMASKS['pipe'][0]
            lHitmask = HITMASKS['pipe'][1]

            # if bird collided with upipe or lpipe
            uCollide = pixelCollision(playerRect, uPipeRect, pHitMask, uHitmask)
            lCollide = pixelCollision(playerRect, lPipeRect, pHitMask, lHitmask)

            if uCollide or lCollide:
                statuses[idx] = True
    return statuses

def pixelCollision(rect1, rect2, hitmask1, hitmask2):
    """Checks if two objects collide and not just their rects"""
    rect = rect1.clip(rect2)

    if rect.width == 0 or rect.height == 0:
        return False

    x1, y1 = rect.x - rect1.x, rect.y - rect1.y
    x2, y2 = rect.x - rect2.x, rect.y - rect2.y

    for x in range(rect.width):
        for y in range(rect.height):
            if hitmask1[x1+x][y1+y] and hitmask2[x2+x][y2+y]:
                return True
    return False

def getHitmask(image):
    """returns a hitmask using an image's alpha."""
    mask = []
    for x in range(image.get_width()):
        mask.append([])
        for y in range(image.get_height()):
            mask[x].append(bool(image.get_at((x,y))[3]))
    return mask

if __name__ == '__main__':
    main()