class GameOver {
    constructor() {
        this.w = 240;
        this.h = 120;

        this.cx = 360 / 2;
        this.cy = 640 / 2;

        this.x = this.cx - this.w/2;
        this.y = this.cy - this.h/2;
    }
    update(ctx) {
        ctx.fillStyle = "rgba(0, 0, 0, 0.5)";
        ctx.fillRect(this.x, this.y, this.w, this.h);

        this.centerText(ctx, 'GAME OVER', this.cy, '48px', 'Consolas', 'Black');
        this.centerText(ctx, '(Press "N" to start)', this.cy + 48, '24px', 'Consolas', 'Black');
    }
    centerText(ctx, txt, y, s, f, c) {
        ctx.font = s + ' ' + f;
        ctx.fillStyle = 'Black';
        let x = (ctx.canvas.width - ctx.measureText(txt).width) / 2;
        ctx.fillText(txt, x, y);
    }
}