ls-cam-smith / snake Goto Github PK

Recently changed to use event system, and tri-state game state variable.

Worked earlier, may have broken with subsequent tweaking of something...

just like fruit, but worth more points and they move randomly every 3 or 4 ticks

put a movement handler on the player, and have main game call that instead of directly setting the facing attribute.

use sqlite maybe?

• sdl2
• recommend asdf
• figure out how bundler should work, then document it

Either as a gem, or perhaps as a bundled application including a Ruby interpreter.

1, 2, 3, have a thing to show the current speed.

Could make an enum of common events like fruit generated fruit picked up snake collision detected etc.

Then write an event dispatcher which methods/functions can assign themselves to as a listener eg

def play_pickup_sound(event_context)
    @sound.play
end

# think notation for passing reference to function is different, &play_pickup_sound ?
EventHandler.register(Events::FRUIT_PICKED_UP, play_pickup_sound)

The register method would add the method reference to a list, and when the event is fired, all handlers called one by one with the event context (a hash of details, e.g. x,y coords (this means in the future it would be easy to extend the sound handler to pan the sound left and right in response to gameplay!))

Where I see this being useful:

• scoreboard
• regenerating fruit
• sounds
• game reset / initialisation

In order to solve #4 I put in a basic flag to prevent fast players turning to an allowed direction, then to the opposite facing before the end of the tick.

The flag blocks input until the next movement tick is completed.

However I think a better solution is to keep track of the facing from the last movement, i.e last_moved_facing and prevent switching to the opposite of that.

see: https://ruby-doc.org/stdlib-2.5.3/libdoc/observer/rdoc/Observable.html

This is because I am using sleeps in a single-threaded application, instead of checking a timer in the update method of the game object.

just to make debugging, reading, and tracing easier.

make like tron basically