My name: Rob Russell
I created a basic framework for a game and experimented with changing game states and creating classes with closures to instantiate game objects that will be updated and their positions used to re-render the scene.
I got some help from the examples and documentation on the universe library.
I basically started with this example from the documentation above:
(define (create-UFO-scene height)
(underlay/xy (rectangle 100 100 "solid" "white") 50 height UFO))
(define UFO
(underlay/align "center"
"center"
(circle 10 "solid" "green")
(rectangle 40 4 "solid" "green")))
(animate create-UFO-scene)And then re-wrote and extended it once I read through the docs a little more and understood what was going on.
####My basic player class:
;;player class
(define (player x y speed health)
(define (dispatch id)
(cond
[(equal? id 'x) x]
[(equal? id 'y) y]
[(equal? id 'speed) speed]
[(equal? id 'health) health]
[(equal? id 'move-left) (set! x (- x 2))]
[(equal? id 'move-right) (set! x (+ x 2))]
[(equal? id 'move-down) (set! y (+ y speed))]
[else (error "PLAYER -- no match for: " id)]))
dispatch)####I also imported an image to use for the player:
(define bob-sprite (rotate 180 (bitmap "Plane.png")))####And added some input handling:
;;handle input
(define (handle-key-down world key)
(cond
[(key=? key "left") (bob 'move-left)]
[(key=? key "right") (bob 'move-right)]
[else world]
)
)
(define (handle-key-up world key)
(cond
[(key=? key "left") bob]
[(key=? key "right") bob]
[else world]
))This library makes input handling super easy, and now that I understand the game cycle, I can quickly add a lot more functionality to this. Currently the ship just goes from the top to the bottom of the screen, and you can press the arrow keys to make it go a little left or a little right as it travels down. Definitely gonna mess with this some more over the break, finally having fun in Racket!
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent