summaryrefslogtreecommitdiffstats
path: root/doc/FontId.3
diff options
context:
space:
mode:
authorrjohnson <rjohnson>1998-04-01 09:37:39 (GMT)
committerrjohnson <rjohnson>1998-04-01 09:37:39 (GMT)
commit13242623d2ff3ea02ab6a62bfb48a7dbb5c27e22 (patch)
tree3100714738a7941b590efee466a774862f9671c3 /doc/FontId.3
parente4ab1102029f9ac557ff190bfb9d34408340f345 (diff)
downloadtk-13242623d2ff3ea02ab6a62bfb48a7dbb5c27e22.zip
tk-13242623d2ff3ea02ab6a62bfb48a7dbb5c27e22.tar.gz
tk-13242623d2ff3ea02ab6a62bfb48a7dbb5c27e22.tar.bz2
Initial revision
Diffstat (limited to 'doc/FontId.3')
-rw-r--r--doc/FontId.395
1 files changed, 95 insertions, 0 deletions
diff --git a/doc/FontId.3 b/doc/FontId.3
new file mode 100644
index 0000000..71f39e1
--- /dev/null
+++ b/doc/FontId.3
@@ -0,0 +1,95 @@
+'\"
+'\" Copyright (c) 1996 Sun Microsystems, Inc.
+'\"
+'\" See the file "license.terms" for information on usage and redistribution
+'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+'\"
+'\" SCCS: @(#) FontId.3 1.4 97/11/04 18:03:07
+'\"
+.so man.macros
+.TH Tk_FontId 3 8.0 Tk "Tk Library Procedures"
+.BS
+.SH NAME
+Tk_FontId, Tk_FontMetrics, Tk_PostscriptFontName \- accessor functions for
+fonts
+.SH SYNOPSIS
+.nf
+\fB#include <tk.h>\fR
+.sp
+Font
+\fBTk_FontId(\fItkfont\fB)\fR
+.sp
+void
+\fBTk_GetFontMetrics(\fItkfont, fmPtr\fB)\fR
+.sp
+int
+\fBTk_PostscriptFontName(\fItkfont, dsPtr\fB)\fR
+
+.SH ARGUMENTS
+.AS Tk_FontMetrics *dsPtr
+.AP Tk_Font tkfont in
+Opaque font token being queried. Must have been returned by a previous
+call to \fBTk_GetFont\fR.
+.AP Tk_FontMetrics *fmPtr out
+Pointer to structure in which the font metrics for \fItkfont\fR will
+be stored.
+.AP Tcl_DString *dsPtr out
+Pointer to an initialized \fBTcl_DString\fR to which the name of the
+Postscript font that corresponds to \fItkfont\fR will be appended.
+.BE
+
+.SH DESCRIPTION
+.PP
+Given a \fItkfont\fR, \fBTk_FontId\fR returns the token that should be
+selected into an XGCValues structure in order to construct a graphics
+context that can be used to draw text in the specified font.
+.PP
+\fBTk_GetFontMetrics\fR computes the ascent, descent, and linespace of the
+\fItkfont\fR in pixels and stores those values in the structure pointer to by
+\fIfmPtr\fR. These values can be used in computations such as to space
+multiple lines of text, to align the baselines of text in different
+fonts, and to vertically align text in a given region. See the
+documentation for the \fBfont\fR command for definitions of the terms
+ascent, descent, and linespace, used in font metrics.
+.PP
+\fBTk_PostscriptFontName\fR maps a \fItkfont\fR to the corresponding
+Postcript font name that should be used when printing. The return value
+is the size in points of the \fItkfont\fR and the Postscript font name is
+appended to \fIdsPtr\fR. \fIDsPtr\fR must refer to an initialized
+\fBTcl_DString\fR. Given a ``reasonable'' Postscript printer, the
+following screen font families should print correctly:
+.IP
+\fBAvant Garde\fR, \fBArial\fR, \fBBookman\fR, \fBCourier\fR,
+\fBCourier New\fR, \fBGeneva\fR, \fBHelvetica\fR, \fBMonaco\fR,
+\fBNew Century Schoolbook\fR, \fBNew York\fR, \fBPalatino\fR, \fBSymbol\fR,
+\fBTimes\fR, \fBTimes New Roman\fR, \fBZapf Chancery\fR, and
+\fBZapf Dingbats\fR.
+.PP
+Any other font families may not print correctly because the computed
+Postscript font name may be incorrect or not exist on the printer.
+.VS 8.0 br
+.SH DATA STRUCTURES
+The Tk_FontMetrics data structure is used by Tk_GetFontMetrics to return
+information about a font and is defined as follows:
+.CS
+typedef struct Tk_FontMetrics {
+ int ascent;
+ int descent;
+ int linespace;
+} Tk_FontMetrics;
+.CE
+The \fIlinespace\fR field is the amount in pixels that the tallest
+letter sticks up above the baseline, plus any extra blank space added
+by the designer of the font.
+.PP
+The \fIdescent\fR is the largest amount in pixels that any letter
+sticks below the baseline, plus any extra blank space added by the
+designer of the font.
+.PP
+The \fIlinespace\fR is the sum of the ascent and descent. How far
+apart two lines of text in the same font should be placed so that none
+of the characters in one line overlap any of the characters in the
+other line.
+.VE
+.SH KEYWORDS
+font