курсовая работа / game / EventManager

import { Vec } from "../core";

/** @enum {number} */
export const KeyEvents = {
UP: 0,
DOWN: 1,
LEFT: 2,
RIGHT: 3,
SPACE: 4,
};

/** @param {KeyboardEvent} ev
* @returns {KeyEvents} */
export function getKeyEvent(ev) {
return [
KeyEvents.UP,
KeyEvents.LEFT,
KeyEvents.DOWN,
KeyEvents.RIGHT,
KeyEvents.SPACE,
][["w", "a", "s", "d", " "].indexOf(ev.key)];
}

export class InputState {
/** @type {Vec} */
mousePos = new Vec();
/** @type {boolean} */
mouseClick = false;
/** @type {Set<KeyEvents>} */
moves = new Set();
}

export class EventManager {
/** type {InputState} */
state = new InputState();

/** @param {CanvasRenderingContext2D} ctx */
constructor(ctx) {
ctx.canvas.addEventListener("mousemove", (ev) => {
let rect = ctx.canvas.getBoundingClientRect();
this.state.mousePos = new Vec(
ev.clientX - rect.left,
ev.clientY - rect.top
);
});
ctx.canvas.addEventListener("mousedown", (ev) => {
this.state.mouseClick = true;
});
ctx.canvas.addEventListener("mouseup", (ev) => {
this.state.mouseClick = false;
});
window.addEventListener("keydown", (ev) => {
this.state.moves.add(getKeyEvent(ev));
});
window.addEventListener("keyup", (ev) => {
this.state.moves.delete(getKeyEvent(ev));
});
}
}