arrows

read arrow keys and shoot

Installing

component install entity/arrows

Goals

• Should have minimum footprint. Uses 5 bits, 4 directional, 1 to shoot.
• Recent opposite arrows should take precedence over old ones.
• The arrows pressed at any point, after crazy fast combinations, should correctly evaluate to the desired direction.
• Should allow evaluating in a loop, instead of listening to events, but also provide events when needed.
• Should enforce writing a control function that will evaluate the correct state of the player's controls by only sharing those 5 bits at any given point.

Example

var k = arrows();

document.body.onkeydown = k.onkeydown;
document.body.onkeyup = k.onkeyup;

function ctrl(){
  k & k.left  && left();
  k & k.up    && up();
  k & k.right && right();
  k & k.down  && down();
  k & k.shoot && shoot();
}

loop(ctrl);

Also, a real example.

API

arrows()

#onkeydown()

#onkeyup()

Flags

left  = 00001
up    = 00010
right = 00100
down  = 01000
shoot = 10000

License

MIT