toColumnSpaceCoordinate(x) {
        let spacing = (CIRCUIT_OP_HORIZONTAL_SPACING + Config.GATE_RADIUS * 2);
        let left = CIRCUIT_OP_LEFT_SPACING - CIRCUIT_OP_HORIZONTAL_SPACING / 2;
        return (x - left) / spacing - 0.5;
    }
@param {!number} x
@returns {!number} The continuous column-space coordinate corresponding to the given display-space coordinate.
@private