CloudInvaders/js/entity.js

class Entity {
    constructor(x, y, w, h) {
        this.x = x;
        this.y = y;
        this.w = w;
        this.h = h;
        this.element = document.createElement('div');
        ROOT.appendChild(this.element);
        this.draw();
        this.alive = true;
    }

    draw() {
        if (this.alive) {
            this.element.style.left = `${this.x * 100}%`;
            this.element.style.top = `${this.y * 100}%`;
            this.element.style.width = `${this.w * 100}%`;
            this.element.style.height = `${this.h * 100}%`;
        }
    }

    destroy() {
        this.element.remove();
        this.alive = false;
    }

    isOverlapped(other) {
        if (!this.alive || !other.alive) return false;
        if (other.x + other.w / 2 < this.x - this.w / 2) return false;
        if (other.x - other.w / 2 > this.x + this.w / 2) return false;
        if (other.y + other.h / 2 < this.y - this.h / 2) return false;
        if (other.y - other.h / 2 > this.y + this.h / 2) return false;

        return true;
    }
}