witchday/DirectionInput.js

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class DirectionInput {
constructor() {
this.heldDirections = [];
this.map = {
"ArrowUp": "up",
"KeyW": "up",
"ArrowDown": "down",
"KeyS": "down",
"ArrowLeft": "left",
"KeyA": "left",
"ArrowRight": "right",
"KeyD": "right",
}
}
get direction() {
return this.heldDirections[0];
}
init() {
document.addEventListener("keydown", e => {
const dir = this.map[e.code];
if (dir && this.heldDirections.indexOf(dir) === -1) {
this.heldDirections.unshift(dir);
}
});
document.addEventListener("keyup", e => {
const dir = this.map[e.code];
const index = this.heldDirections.indexOf(dir);
if (index > -1) {
this.heldDirections.splice(index, 1);
}
});
}
}