IfcCorrectFillAreaStyle

Semantic definitions at the function

Function Definition

This function returns true if the different fill area styles are assigned correctly to the IfcFillAreaStyle. Only certain combinations of the entity types provided by the IfcFillStyleSelect are allowed.

Return false:

if more then one externally defined style is assigned
if an externally defined style is given and any other internal style definition is attached additionally
if more then one background colour is assigned
if both, a hatching and a tiling is assigned

otherwise return true

HISTORY New function in Release IFC2x3 TC1.

Formal representations

EXPRESS Specification


FUNCTION IfcCorrectFillAreaStyle


  (Styles : SET[1:?] OF IfcFillStyleSelect)
  :LOGICAL;

LOCAL
   Hatching : INTEGER := 0;
   Tiles    : INTEGER := 0;
   Colour   : INTEGER := 0;
   External : INTEGER := 0;
END_LOCAL;


External := SIZEOF(QUERY(Style <* Styles |
  'IFCPRESENTATIONAPPEARANCERESOURCE.IfcExternallyDefinedHatchStyle' IN
   TYPEOF(Style)));

Hatching  := SIZEOF(QUERY(Style <* Styles |
  'IFCPRESENTATIONAPPEARANCERESOURCE.IfcFillAreaStyleHatching' IN
   TYPEOF(Style)));

Tiles     := SIZEOF(QUERY(Style <* Styles |
  'IFCPRESENTATIONAPPEARANCERESOURCE.IfcFillAreaStyleTiles' IN
   TYPEOF(Style)));

Colour    := SIZEOF(QUERY(Style <* Styles |
  'IFCPRESENTATIONAPPEARANCERESOURCE.IfcColour' IN
   TYPEOF(Style)));


IF (External > 1) THEN
  RETURN (FALSE);
END_IF;


IF ((External = 1) AND ((Hatching > 0) OR (Tiles > 0) OR (Colour > 0))) THEN
  RETURN (FALSE);
END_IF;


IF (Colour > 1) THEN
  RETURN (FALSE);
END_IF;

IF ((Hatching > 0) AND (Tiles >0)) THEN
  RETURN (FALSE);
END_IF;

RETURN(TRUE);



END_FUNCTION;