DynaBlaster: Htdp version of Dynablaster game

1 How to play

To run the game, type

(require (planet "dynablaster.rkt" ("jeeve" "dynablaster.plt" 1 11)))

(run) ; or (run #:sound #f) to play without sound effect

Use left, right, up and down keys to move blue player in the scene.

Drop bombs with space key and attack the red player.

Good luck !

If you want to see the computer play alone, type

(require (planet "dynablaster.rkt" ("jeeve" "dynablaster.plt" 1 11)))

(run move-robot-default move-robot-default)

2 Customize the behavior of the robot

(run my-move-robot-function)

Before, define a custom move-robot function. For example :

(define (my-move-robot-function f-r d)

(let ([r (f-r d)])

(if (empty? r) ; robot is not dead ?

d

(if (empty? (sprite-left r (lambda (x) #t) d)) ; something at left of robot ?

(go-left r d) ; go to left !

d))))

Also, you can start the game in automatically mode, the blue player is controlled by a function like the robot. So you can easily compare the behavior of two algorithms.

(run my-move-robot-function my-move-player-function)

You can use these functions and predicates :

• The player and robot sprite : player robot

• Sprite informations : sprite-x sprite-y sprite-dx sprite-dy sprite-energy

• Sprite actions : go-left go-right go-up go-down drop-bomb

• Sprite predicates : bomb? fire? player? robot? blocked? brick? rock?

• Sprite search : sprite-left sprite-right sprite-up sprite-down search-sprite

• Distance between two sprites : distance

• Default move robot function : move-robot-default

Do not hesitate to send me your move-robot functions (jeeve <[email protected]>)

3 Default move-robot function

For information, the default move-robot has only random and defensive behavior. The code corresponding is

(define (move-robot-default f-r d)

(let* ([r (f-r d)]; robot in decor d

[x (random 100)]

[danger? (lambda (x) (or (bomb? x) (fire? x)))]

[something? (lambda (x) #t)]

[escape (lambda (r d)

(cond [(not (empty? (sprite-left r danger? d))) (go-right r d)]

[(not (empty? (sprite-right r danger? d))) (go-left r d)]

[(not (empty? (sprite-up r danger? d))) (go-down r d)]

[(not (empty? (sprite-down r danger? d))) (go-up r d)]

[(not (empty? (search-sprite (sprite-x r) (sprite-y r) bomb? d)))

(cond  [(empty? (sprite-left r something? d)) (go-left r d)]

[(empty? (sprite-right r something? d)) (go-right r d)]

[(empty? (sprite-up r something? d)) (go-up r d)]

[(empty? (sprite-down r something? d)) (go-down r d)]

[else d])]))])

(if (empty? r)

d

(cond

; fear of fire

[(or (not (empty? (sprite-left r danger? d)))

(not (empty? (sprite-right r danger? d)))

(not (empty? (search-sprite (sprite-x r) (sprite-y r) bomb? d))))

(if (empty? (sprite-up r something? d))

(go-up r d)

(if (empty? (sprite-down r something? d))

(go-down r d)

(escape r d)))]

[(or (not (empty? (sprite-up r danger? d)))

(not (empty? (sprite-down r danger? d)))

(not (empty? (search-sprite (sprite-x r) (sprite-y r) bomb? d))))

(if (empty? (sprite-left r something? d))

(go-left r d)

(if (empty? (sprite-right r something? d))

(go-right r d)

(escape r d)))]

; intention

[(and (> x 0) (<= x 10) (empty? (sprite-up r fire? d))) (go-up r d)]

[(and (> x 10) (<= x 20) (empty? (sprite-down r fire? d))) (go-down r d)]

[(and (> x 20) (<= x 30) (empty? (sprite-left r fire? d))) (go-left r d)]

[(and (> x 30) (<= x 40) (empty? (sprite-right r fire? d))) (go-right r d)]

[(and (> x 40) (<= x 42) (not (blocked? r d))) (drop-bomb r d)]

[else d]))))