8.12.3.9 IfcDraughtingPreDefinedColour

8.12.3.9.1 Semantic definition

The draughting pre defined colour is a pre defined colour for the purpose to identify a colour by name. Allowable names are:

'black',
'red',
'green',
'blue',
'yellow',
'magenta',
'cyan',
'white',
'by layer'

The following table states the RGB values associated with the names given by the IfcDraughtingPreDefinedColour.

Colour name	Red	Green	Blue
black	0	0	0
red	1.0	0	0
green	0	1.0	0
blue	0	0	1.0
yellow	1.0	1.0	0
magenta	1.0	0	1.0
cyan	0	1.0	1.0
white	1.0	1.0	1.0

Table 8.12.3.9.A

If the colour name is 'by layer', colour values obtained from IfcPresentationLayerWithStyle.

Informal Propositions:

The value 'by layer' shall only be inserted, if the geometric representation item using the colour definition has an association to IfcPresentationLayerWithStyle, and if that instance of IfcPresentationLayerWithStyle has a valid colour definition for IfcCurveStyle, IfcSymbolStyle, or IfcSurfaceStyle (depending on what is applicable).

8.12.3.9.2 Entity inheritance

8.12.3.9.3 Attributes

#	Attribute	Type	Description
IfcPreDefinedItem (1)
1	Name	IfcLabel	The string by which the pre defined item is identified. Allowable values for the string are declared at the level of subtypes.

Table 8.12.3.9.B

8.12.3.9.4 Formal propositions

Name	Description
PreDefinedColourNames	The inherited name for pre defined items shall only have the value of one of the following words.
`SELF\IfcPreDefinedItem.Name IN ['black','red','green','blue','yellow', 'magenta','cyan','white','by layer']`

Table 8.12.3.9.C

8.12.3.9.5 Formal representation

ENTITY IfcDraughtingPreDefinedColour
 SUBTYPE OF (IfcPreDefinedColour);
 WHERE
	PreDefinedColourNames : SELF\IfcPreDefinedItem.Name IN ['black','red','green','blue','yellow',
     'magenta','cyan','white','by layer'];
END_ENTITY;

8.12.3.9.6 References

IfcPreDefinedColour