SET BACK INTERIOR COLOUR(3P+) — MISC. REFERENCE MANUAL PAGES

NAME

SET BACK INTERIOR COLOUR − create a structure element to set the back interior colour

SYNOPSIS

C Syntax

void
psetbackintcolour ( colour )
Pgcolr∗colour;back interior colour

FORTRAN Syntax

SUBROUTINE psbico ( COLMOD, ICOLR, COLR )
INTEGERCOLMODcolour model
INTEGERICOLRcolour table index
REALCOLR(3)colour triple

Required PHIGS Operating States

(PHOP, ∗, STOP, ∗)

DESCRIPTION

Purpose

SET BACK INTERIOR COLOUR creates a structure element to set the back interior colour.

When the current back interior colour Aspect Source Flag (ASF) is set to INDIVIDUAL, the current value of this attribute defines the back interior colour to be applied to the following output primitives:

• FILL AREA

• FILL AREA 3

• FILL AREA SET

• FILL AREA SET 3

• FILL AREA 3 WITH DATA

• FILL AREA SET 3 WITH DATA

• NON-UNIFORM B-SPLINE SURFACE

• POLYHEDRON 3 WITH DATA

• QUADRILATERAL MESH 3 WITH DATA

• TRIANGLE STRIP 3 WITH DATA

This is a SunPHIGS Extension function based on PHIGS+ and is not part of the PHIGS standard.

C Input Parameters

All of the following data types are predefined in phigs.h.

colourThe colour model. Pgcolr is defined as:

typedef struct {
Pint type;/∗ indirect, RGB, CIE, HSV, HLS ∗/
union {
   Pintindex;/∗ colour table index ∗/
   struct {
Pfloatx;/∗ red, hue, etc. ∗/
Pfloaty;/∗ green, saturation, lightness, etc. ∗/
Pfloatz;/∗ blue, value, saturation, etc. ∗/
   } general;
} val;
} Pgcolr;

FORTRAN Input Parameters

All of the following data types are predefined in phigs77.h.

COLMOD
The colour model. The predefined values are:

0PINDIRColour Index Specified
1PRGBRed, Green, and Blue
2PCIECIE Colour Model
3PHSVHue, Saturation, and Value
4PHLSHue, Lightness, and Saturation

ICOLR
An integer index into the workstation colour table for determining the back interior colour. This value is not used if COLMOD is greater than zero.

COLR(3)
An array of reals containing the back interior colour. This array is unused if COLMOD is equal to zero or PINDIR.

COLR(1) = Red, Hue, etc.
COLR(2) = Green, Saturation, Lightness, etc.
COLR(3) = Blue, Value, Saturation, etc.

Execution

Depending on the edit mode, a SET BACK INTERIOR COLOUR element with the value back interior colour in the specified colour model is inserted into the open structure after the element pointer or replaces the element pointed at by the element pointer. The element pointer is then updated to point to this SET BACK INTERIOR COLOUR element.

Back face attributes (such as back area properties, back interior colour, back interior reflectance equation, back interior shading method, back interior style, and back interior style index) are used only when the face distiguishing mode has the value Yes and are applied to only the back facing portion of area defining primitives. See SET FACE DISTIGUISHING MODE (3P+) for details on front and back face determination.

When the current back interior colour ASF is set to INDIVIDUAL, area-defining output primitives, which follow in the structure network and are subject to back face attributes, are filled using the current back interior colour.

When the current back interior colour ASF is set to BUNDLED, the back interior colour is taken from the workstation extended representation indicated by the current interior index. In this case, the back interior colour set with SET BACK INTERIOR COLOUR has no effect.

ERRORS

005Ignoring function, function requires state (PHOP, ∗, STOP, ∗)

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