IfcSurfaceWeightsPositive

Semantic definitions at the function

Function Definition

NOTE Definition according to ISO/CD 10303-42:1992
This function checks the weights associated with the control points of a rational b-spline surface and returns TRUE if they are all positive.

NOTE Function adapted from surface_weights_positive defined in ISO 10303-42.

HISTORY New function in IFC4

Formal representations

EXPRESS Specification


FUNCTION IfcSurfaceWeightsPositive


( B: IfcRationalBSplineSurfaceWithKnots) 
: BOOLEAN; 

  LOCAL 
    Result : BOOLEAN := TRUE; 
    Weights : ARRAY [ 0 : B\IfcBSplineSurface.UUpper ] OF ARRAY [ 0 : B\IfcBSplineSurface.VUpper ] OF REAL := B.Weights; 
  END_LOCAL; 

  REPEAT i := 0 TO B\IfcBSplineSurface.UUpper; 
    REPEAT j := 0 TO B\IfcBSplineSurface.VUpper; 
      IF (Weights[i][j] <= 0.0) THEN 
        Result := FALSE; 
        RETURN(Result); 
      END_IF; 
    END_REPEAT; 
  END_REPEAT; 
  RETURN(Result);



END_FUNCTION;