colisiones.js

/**
 *
 * @param point An object that has x and y properties; the coordinates shouldn't be global, but relative to the point
 * @returns {boolean}
 */
relativePointOutOfLimits(point) {
    const absoluteX = point.x + this.globalX;
    const absoluteY = point.y + this.globalY;
    return this.absolutePointOutOfLimits(absoluteX, absoluteY);
}

/**
 * @param absoluteX
 * @param absoluteY
 * @returns {boolean}
 */
absolutePointOutOfLimits(absoluteX, absoluteY) {
    return absoluteX < 0 || absoluteX > Game.COLUMNS - 1 || absoluteY < 0 || absoluteY > Game.ROWS - 1;
}

// It returns true even if the point is not valid (for example if it is out of limit, because it is not the function's responsibility)
isEmptyPoint(x, y) {
    if (!this.existingPieces[y]) return true;
    if (!this.existingPieces[y][x]) return true;
    if (this.existingPieces[y][x].taken) {
        return false;
    } else {
        return true;
    }
}

/**
 * Check if a point (in the game board) is valid to put another point there.
 * @param point the point to check, with relative coordinates
 * @param points an array of points that conforms a figure
 */
isValidPoint(point, points) {
    const emptyPoint = this.isEmptyPoint(this.globalX + point.x, this.globalY + point.y);
    const hasSameCoordinateOfFigurePoint = points.findIndex(p => {
        return p.x === point.x && p.y === point.y;
    }) !== -1;
    const outOfLimits = this.relativePointOutOfLimits(point);
    if ((emptyPoint || hasSameCoordinateOfFigurePoint) && !outOfLimits) {
        return true;
    } else {
        return false;
    }
}