IfcDimensionsForSiUnit

IfcDimensionsForSiUnit

函数定义
ISO/CD 10303-41:1992中的定义：函数返回给定SI单位的尺寸指数。

参数定义：
N：（输入）将返回维度指数的单位的名称。

 

FUNCTION IfcDimensionsForSiUnit
(n : IfcSiUnitName )     : IfcDimensionalExponents;
  CASE n OF
    METRE          : RETURN (IfcDimensionalExponents
                             (1, 0, 0, 0, 0, 0, 0));
    SQUARE_METRE   : RETURN (IfcDimensionalExponents
                             (2, 0, 0, 0, 0, 0, 0));
    CUBIC_METRE    : RETURN (IfcDimensionalExponents
                             (3, 0, 0, 0, 0, 0, 0));
    GRAM           : RETURN (IfcDimensionalExponents
                             (0, 1, 0, 0, 0, 0, 0));
    SECOND         : RETURN (IfcDimensionalExponents
                             (0, 0, 1, 0, 0, 0, 0));
    AMPERE         : RETURN (IfcDimensionalExponents
                             (0, 0, 0, 1, 0, 0, 0));
    KELVIN         : RETURN (IfcDimensionalExponents
                             (0, 0, 0, 0, 1, 0, 0));
    MOLE           : RETURN (IfcDimensionalExponents
                             (0, 0, 0, 0, 0, 1, 0));
    CANDELA        : RETURN (IfcDimensionalExponents
                             (0, 0, 0, 0, 0, 0, 1));
    RADIAN         : RETURN (IfcDimensionalExponents
                             (0, 0, 0, 0, 0, 0, 0));
    STERADIAN      : RETURN (IfcDimensionalExponents
                             (0, 0, 0, 0, 0, 0, 0));
    HERTZ          : RETURN (IfcDimensionalExponents
                             (0, 0, -1, 0, 0, 0, 0));
    NEWTON         : RETURN (IfcDimensionalExponents
                             (1, 1, -2, 0, 0, 0, 0));
    PASCAL         : RETURN (IfcDimensionalExponents
                             (-1, 1, -2, 0, 0, 0, 0));
    JOULE          : RETURN (IfcDimensionalExponents
                             (2, 1, -2, 0, 0, 0, 0));
    WATT           : RETURN (IfcDimensionalExponents
                             (2, 1, -3, 0, 0, 0, 0));
    COULOMB        : RETURN (IfcDimensionalExponents
                             (0, 0, 1, 1, 0, 0, 0));
    VOLT           : RETURN (IfcDimensionalExponents
                             (2, 1, -3, -1, 0, 0, 0));
    FARAD          : RETURN (IfcDimensionalExponents
                             (-2, -1, 4, 2, 0, 0, 0));
    OHM            : RETURN (IfcDimensionalExponents
                             (2, 1, -3, -2, 0, 0, 0));
    SIEMENS        : RETURN (IfcDimensionalExponents
                             (-2, -1, 3, 2, 0, 0, 0));
    WEBER          : RETURN (IfcDimensionalExponents
                             (2, 1, -2, -1, 0, 0, 0));
    TESLA          : RETURN (IfcDimensionalExponents
                             (0, 1, -2, -1, 0, 0, 0));
    HENRY          : RETURN (IfcDimensionalExponents
                             (2, 1, -2, -2, 0, 0, 0));
    DEGREE_CELSIUS : RETURN (IfcDimensionalExponents
                             (0, 0, 0, 0, 1, 0, 0));
    LUMEN          : RETURN (IfcDimensionalExponents
                             (0, 0, 0, 0, 0, 0, 1));
    LUX            : RETURN (IfcDimensionalExponents
                             (-2, 0, 0, 0, 0, 0, 1));
    BECQUEREL      : RETURN (IfcDimensionalExponents
                             (0, 0, -1, 0, 0, 0, 0));
    GRAY           : RETURN (IfcDimensionalExponents
                             (2, 0, -2, 0, 0, 0, 0));
    SIEVERT        : RETURN (IfcDimensionalExponents
                             (2, 0, -2, 0, 0, 0, 0));
    OTHERWISE      : RETURN (IfcDimensionalExponents
                             (0, 0, 0, 0, 0, 0, 0));
  END_CASE;
END_FUNCTION;

 

 

 

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