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.TH "ANNOTATION TEXT RELATIVE" 3P "29 February 1991"
.SH NAME
ANNOTATION TEXT RELATIVE \- create structure element specifying \s-2\&2D\s+2 annotation text primitive
.IX "Primitives, Text Primitives" "ANNOTATION TEXT RELATIVE"
.IX "Text Primitives" "ANNOTATION TEXT RELATIVE"
.SH SYNOPSIS
.SS C Syntax
.ft B
.ta 1.25i 3i
.nf
void
panno_text_rel ( ref_pt, anno_offset, text )
Ppoint	*ref_pt;	\fIreference point\fP
Pvec	*anno_offset;	\fIannotation offset\fP
char	*text;	\fIannotation text string\fP
.fi
.ft R
.SS Required PHIGS Operating States
(PHOP, *, STOP, *)
.SH DESCRIPTION
.SS  Purpose
The \s-2ANNOTATION TEXT RELATIVE\s+2 subroutine puts a structure element 
containing the full specification of a two-dimensional \s-2ANNOTATION TEXT
RELATIVE\s+2 primitive into the currently open structure.
.LP
The \s-2ANNOTATION TEXT RELATIVE\s+2 primitive is a character string.  The 
location of the string in the display is controlled by the \fIreference point\fP and \fIannotation offset\fP subroutine parameters.  \s-2ANNOTATION TEXT 
RELATIVE\s+2 primitives differ from \s-2TEXT\s+2 primitives in that the
reference point is specified in Modelling Coordinates (\s-2MC\s+2).  The \fIz\fP
coordinate is assumed to be 0. The characters are generated in the Normalized
Projection Coordinate (\s-2NPC\s+2) Space. Aspects of the text display,
such as the font, colour, spacing, height, and alignment,
are controlled by the current values 
of the primitive attributes listed below.
.LP
If the current edit mode is \s-2INSERT\s+2, the structure element created by 
the \s-2ANNOTATION TEXT RELATIVE\s+2 subroutine is inserted into the open
structure after the element pointed to by the current element pointer. 
If the
current edit mode is \s-2REPLACE\s+2, the new \s-2ANNOTATION TEXT RELATIVE\s+2
element replaces the element in the structure pointed to by the element pointer.
In either case, the element pointer is updated to point to the new 
\s-2ANNOTATION TEXT RELATIVE\s+2 element.
.SS C Input Parameters
.IP \fIref_pt\fP
A pointer to a Ppoint structure containing the \fIx\fP and \fIy\fP
\s-2MC\s+2 that locate the annotation text.
The Ppoint structure is defined in phigs.h as follows:
.sp .4
.ta .5i +\w'Pfloat     'u +\w'x;  'u
.nf
typedef struct  {
.sp .2
        Pfloat     x;      /* x coordinate */
        Pfloat     y;      /* y coordinate */
.sp .2
} Ppoint;
.sp
.fi
.IP \fIanno_offset\fP
A pointer to a Pvec structure containing the \fIx\fP and \fIy\fP
coordinates of the offset of the text string from the transformed
reference point.  The annotation offset specifies an offset in
\s-2NPC\s+2.
The Pvec structure is defined in phigs.h as follows:
.sp .4
.ta .5i +\w'Pfloat     'u +\w'delta_x;  'u
.nf
typedef struct  {
.sp .2
        Pfloat     delta_x;      /* delta x value */
        Pfloat     delta_y;      /* delta y value */
.sp .2
} Pvec;
.sp
.fi
.IP \fItext\fP
A pointer to the character string to be written into the display.
.SS Execution
When the structure is traversed, the \s-2ANNOTATION TEXT RELATIVE\s+2 element
draws the specified character string on the plane in the \s-2NPC\s+2 System defined by
the reference point and the annotation offset. These parameters define a Text
Local Coordinate (\s-2TLC\s+2) System in the \s-2NPC\s+2 System.
The annotation offset added to the transformed reference
point defines the origin of this \s-2TLC\s+2 System. The 
\fIx\fP and \fIy\fP axes of the \s-2TLC\s+2 System are parallel to and have the same
direction as the \fIx\fP and \fIy\fP axes of the \s-2NPC\s+2 System.
.LP
The precise position of the text is defined in relation to this plane by
the current values of the text primitive attributes \s-2ANNOTATION TEXT 
CHARACTER UP VECTOR\s+2, \s-2ANNOTATION TEXT CHARACTER\s+2, \s-2BASE VECTOR\s+2,
\s-2ANNOTATION TEXT PATH\s+2, and \s-2ANNOTATION TEXT ALIGNMENT\s+2. The reference point is subject to the current transformations in the transformation 
pipeline from the \s-2MC\s+2 System to the workstation display.
The text itself is only subject to the transformations in the
transformation pipeline from the \s-2NPC\s+2
System to the workstation display.
.LP
Other aspects of the appearance of the text are controlled by the attributes 
\s-2TEXT FONT, TEXT PRECISION\s+2, \s-2ANNOTATION STYLE\s+2, \s-2ANNOTATION TEXTCHARACTER HEIGHT\s+2, \s-2ANNOTATION TEXT CHARACTER WIDTH\s+2, \s-2CHARACTER EXPANSION FACTOR\s+2, \s-2CHARACTER SPACING\s+2, and \s-2TEXT COLOUR INDEX\s+2.
.LP
\s-2ANNOTATION TEXT CHARACTER WIDTH\s+2 and \s-2ANNOTATION TEXT BASE VECTOR\s+2
are implicit attributes derived from \s-2ANNOTATION TEXT CHARACTER HEIGHT\s+2
and \s-2ANNOTATION TEXT UP VECTOR\s+2, respectively.
.SS Attributes Applied
The attributes listed below are used to display the
\s-2ANNOTATION TEXT RELATIVE\s+2 primitive when the structure is traversed. The Aspect Source 
Flags (\s-2ASF\s+2s) tell where to access the output display attributes. 
These attributes can come directly from the traversal state list,
or they can be accessed indirectly, using the appropriate index 
in the traversal state list and the corresponding bundled 
representation in the PHIGS workstation state list.
.RS
.nf
.ta .5i +\w'back interior reflectance equation   'u 
.sp
text font			text font \s-2ASF\s+2
text precision			text precision \s-2ASF\s+2
character expansion factor	character expansion factor \s-2ASF\s+2
character spacing		character spacing \s-2ASF\s+2
text colour			text colour index \s-2ASF\s+2
annotation character height
annotation character up vector
annotation text path
annotation text alignment
annotation style
text index
depth cue index
name set
.fi
.RE
.sp .2
.SH ERRORS
.IP 005
Ignoring function, function requires state (\s-2PHOP\s+2, *, \s-2STOP\s+2, *)
.SH SEE ALSO
.nf
.IP
.ta 0.5i
.SM "TEXT (3P)"
.fi
