unibutton/common/entity.js

class Entity {
    constructor(game) {
        let pos = { x: (Math.random() - 0.5) * (game ? game.width : 1000), y: (Math.random() - 0.5) * (game ? game.height : 1000) };
        let vel = { x: 0, y: 0 };

        this.pos = pos;
        this.vel = vel;
    }
    bounce(game) {
        let ent = this;
        let { width, height } = game;

        let bounced = false;

        if (Math.abs(ent.pos.x) >= width / 2) {
            ent.vel.x = (Math.abs(ent.vel.x) + 10) * -Math.sign(ent.pos.x);
            bounced = true;
        }

        if (Math.abs(ent.pos.y) >= height / 2) {
            ent.vel.y = (Math.abs(ent.vel.y) + 10) * -Math.sign(ent.pos.y);
            bounced = true;
        }

        return bounced;
    }
}

export default Entity;