Teach Your Kids To Code: A Parent-friendly Guide to Python Programming

Game Programming: Coding for Fun 245

if picx + picw / 2 >= paddlex and picx + picw / 2 <= paddlex + \

paddlew:

points += 1

speedy = -speedy

# Draw text on screen

draw_string = "Lives: " + str(lives) + " Points: " + str(points)

text = font.render(draw_string, True, WHITE)

text_rect = text.get_rect()

text_rect.centerx = screen.get_rect().centerx

text_rect.y = 10

screen.blit(text, text_rect)

pygame.display.update()

timer.tick(60)

pygame.quit() # Exit

Our gameplay is nearly complete: the ball bounces off the

paddle, points are awarded, and players lose a life if they miss the

ball and it hits the bottom edge of the screen. All the basic com-

ponents are there to make this an arcade-style game. Now think

about what improvements you would like to see, work out the logic,

and try adding code to version 1.0 to make your game even more

fun. In the next section, we’ll add three more features to create a

fully interactive, video game–like experience that we can share

with others.

a dding difficulty and ending the

Game: Smiley Pong, Version 2.0

Version 1.0 of our Smiley Pong game is playable. Players can score

points, lose lives, and see their progress on the screen. One thing

we don’t have yet is an end to the game. Another is the sense of

greater challenge as the game progresses. We’ll add the following

features to Smiley Pong, version 1.0, to create a more complete

game in version 2.0: a way to show that the game is over when

the last life is lost, a way to play again or start a new game with-

out closing the program, and a way to increase the difficulty as

the game goes on. We’ll add these three features one at a time,

winding up with a fun, challenging, arcade-style game! The final

version is shown on page 250.