290 lines
7.8 KiB
Groff
290 lines
7.8 KiB
Groff
.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining
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.\" a copy of this software and associated documentation files (the
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.\" "Software"), to deal in the Software without restriction, including
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.\" without limitation the rights to use, copy, modify, merge, publish,
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.\" distribute, sublicense, and/or sell copies of the Software, and to
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.\" permit persons to whom the Software is furnished to do so, subject to
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.\" the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be included
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.\" in all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
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.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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.\" OTHER DEALINGS IN THE SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall
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.\" not be used in advertising or otherwise to promote the sale, use or
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.\" other dealings in this Software without prior written authorization
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.\" from the X Consortium.
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.\"
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.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by
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.\" Digital Equipment Corporation
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.\"
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.\" Portions Copyright \(co 1990, 1991 by
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.\" Tektronix, Inc.
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.\"
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.\" Permission to use, copy, modify and distribute this documentation for
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.\" any purpose and without fee is hereby granted, provided that the above
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.\" copyright notice appears in all copies and that both that copyright notice
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.\" and this permission notice appear in all copies, and that the names of
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.\" Digital and Tektronix not be used in in advertising or publicity pertaining
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.\" to this documentation without specific, written prior permission.
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.\" Digital and Tektronix makes no representations about the suitability
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.\" of this documentation for any purpose.
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.\" It is provided ``as is'' without express or implied warranty.
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.\"
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.\"
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.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xW Athena X Widgets \- C Language X Toolkit Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.na
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.de Ds
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.nf
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.\\$1D \\$2 \\$1
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.ft 1
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.\".ps \\n(PS
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.\" choose appropriate monospace font
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.\" the imagen conditional, 480,
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.\" may be changed to L if LB is too
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.\" heavy for your eyes...
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.\"
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.ie "\\*(.T"480" .ft L
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.ny0
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.TH XDrawText __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
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.SH NAME
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XDrawText, XDrawText16, XTextItem, XTextItem16 \- draw polytext text and text drawing structures
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.SH SYNTAX
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.HP
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int XDrawText\^(\^Display *\fIdisplay\fP\^, Drawable \fId\fP\^, GC \fIgc\fP\^,
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int \fIx\fP\^, int \fIy\fP\^, XTextItem *\fIitems\fP\^, int \fInitems\fP\^);
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.HP
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int XDrawText16\^(\^Display *\fIdisplay\fP\^, Drawable \fId\fP\^, GC
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\fIgc\fP\^, int \fIx\fP\^, int \fIy\fP\^, XTextItem16 *\fIitems\fP\^, int
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\fInitems\fP\^);
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.SH ARGUMENTS
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.IP \fId\fP 1i
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Specifies the drawable.
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.IP \fIdisplay\fP 1i
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Specifies the connection to the X server.
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.IP \fIgc\fP 1i
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Specifies the GC.
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.IP \fIitems\fP 1i
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Specifies an array of text items.
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.IP \fInitems\fP 1i
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Specifies the number of text items in the array.
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.ds Xy , which are relative to the origin of the specified drawable \
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and define the origin of the first character
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.IP \fIx\fP 1i
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.br
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.ns
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.IP \fIy\fP 1i
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Specify the x and y coordinates\*(Xy.
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.SH DESCRIPTION
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The
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.ZN XDrawText16
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function is similar to
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.ZN XDrawText
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except that it uses 2-byte or 16-bit characters.
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Both functions allow complex spacing and font shifts between counted strings.
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.LP
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Each text item is processed in turn.
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A font member other than
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.ZN None
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in an item causes the font to be stored in the GC
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and used for subsequent text.
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A text element delta specifies an additional change
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in the position along the x axis before the string is drawn.
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The delta is always added to the character origin
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and is not dependent on any characteristics of the font.
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Each character image, as defined by the font in the GC, is treated as an
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additional mask for a fill operation on the drawable.
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The drawable is modified only where the font character has a bit set to 1.
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If a text item generates a
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.ZN BadFont
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error, the previous text items may have been drawn.
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.LP
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For fonts defined with linear indexing rather than 2-byte matrix indexing,
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each
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.ZN XChar2b
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structure is interpreted as a 16-bit number with byte1 as the
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most significant byte.
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.LP
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Both functions use these GC components:
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function, plane-mask, fill-style, font, subwindow-mode,
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clip-x-origin, clip-y-origin, and clip-mask.
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They also use these GC mode-dependent components:
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foreground, background, tile, stipple, tile-stipple-x-origin,
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and tile-stipple-y-origin.
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.LP
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.ZN XDrawText
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and
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.ZN XDrawText16
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can generate
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.ZN BadDrawable ,
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.ZN BadFont ,
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.ZN BadGC ,
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and
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.ZN BadMatch
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errors.
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.SH STRUCTURES
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The
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.ZN XTextItem
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and
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.ZN XTextItem16
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structures contain:
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.LP
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.Ds 0
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.TA .5i 3i
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.ta .5i 3i
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typedef struct {
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char *chars; /\&* pointer to string */
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int nchars; /\&* number of characters */
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int delta; /\&* delta between strings */
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Font font; /\&* Font to print it in, None don't change */
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} XTextItem;
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.De
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.LP
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.Ds 0
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.TA .5i 3i
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.ta .5i 3i
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typedef struct {
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XChar2b *chars; /\&* pointer to two-byte characters */
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int nchars; /\&* number of characters */
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int delta; /\&* delta between strings */
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Font font; /\&* font to print it in, None don't change */
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} XTextItem16;
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.De
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.LP
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If the font member is not
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.ZN None ,
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the font is changed before printing and also is stored in the GC.
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If an error was generated during text drawing,
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the previous items may have been drawn.
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The baseline of the characters are drawn starting at the x and y
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coordinates that you pass in the text drawing functions.
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.LP
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For example, consider the background rectangle drawn by
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.ZN XDrawImageString .
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If you want the upper-left corner of the background rectangle
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to be at pixel coordinate (x,y), pass the (x,y + ascent)
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as the baseline origin coordinates to the text functions.
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The ascent is the font ascent, as given in the
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.ZN XFontStruct
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structure.
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If you want the lower-left corner of the background rectangle
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to be at pixel coordinate (x,y), pass the (x,y \- descent + 1)
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as the baseline origin coordinates to the text functions.
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The descent is the font descent, as given in the
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.ZN XFontStruct
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structure.
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.SH DIAGNOSTICS
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.TP 1i
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.ZN BadDrawable
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A value for a Drawable argument does not name a defined Window or Pixmap.
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.TP 1i
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.ZN BadFont
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A value for a Font or GContext argument does not name a defined Font.
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.TP 1i
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.ZN BadGC
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A value for a GContext argument does not name a defined GContext.
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.TP 1i
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.ZN BadMatch
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An
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.ZN InputOnly
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window is used as a Drawable.
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.SH "SEE ALSO"
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XDrawImageString(__libmansuffix__),
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XDrawString(__libmansuffix__),
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XLoadFont(__libmansuffix__)
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.br
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\fI\*(xL\fP
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