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<H2><A NAME="sec:B.5"><SPAN class="sec-nr">B.5</SPAN> <SPAN class="sec-title">Accessing
Windows Fonts</SPAN></A></H2>
<A NAME="sec:winfont"></A>
<P>The normal screen, helvetica, roman and times font families available
in the Unix/X11 version are available using the same names. The system
will try to use an as close as possible equivalent Windows TrueType font
for these.
<P>The Windows `stock' fonts as available from the GetStockObject() API
are available under the special `family' "win". They are in
<A class="tab" href="winfont.html#tab:winfonts">table 11</A>
<P>
<CENTER>
<TABLE BORDER=2 FRAME=box RULES=groups>
<TR VALIGN=top><TD><TT>font(win, ansi_fixed)</TT></TD><TD>Default ANSI
encoded fixed font</TD></TR>
<TR VALIGN=top><TD><TT>font(win, ansi_var)</TT></TD><TD>Default ANSI
encoded variable font</TD></TR>
<TR VALIGN=top><TD><TT>font(win, device_default)</TT></TD><TD>Default
device font</TD></TR>
<TR VALIGN=top><TD><TT>font(win, oem_fixed)</TT></TD><TD>Computers
`native' fixed font (PC)</TD></TR>
<TR VALIGN=top><TD><TT>font(win, system)</TT></TD><TD>Variable pitched
system font</TD></TR>
<TR VALIGN=top><TD><TT>font(win, system_fixed)</TT></TD><TD>Fixed system
font</TD></TR>
</TABLE>
</CENTER>
<TABLE ALIGN=center WIDTH="75%"><TR><TD>
<B>Table 11 : </B>Windows font name mapping</TABLE>
<A NAME="tab:winfonts"></A>
<P>Note that these fonts do not have a specified point-size. Their
point-size depends on the Windows installation. The get-method <B><CODE><-</CODE>points</B>
will return the <B><CODE><-</CODE>height</B> of the font.
<P>Other Windows fonts may be accessed using a similar method as in
Unix/X11: provide a fourth argument describing the font using the hosts
conventions. For the Win32 API, this is a textual description of the
Windows API structure LOGFONT passed to CreateFontIndirect(). The
description is a `:' (colon) separated list of attributes of the
structure. The attributes need not be specified in the order of the
structure-layout. Omited attributes are set to their default.
<P>Attributes come in four types: numeric, boolean, enumerated and
string. In general, an attribute is specified as:
<BLOCKQUOTE><<VAR>name</VAR>>(<<VAR>value</VAR>>)</BLOCKQUOTE>
<<VAR>name</VAR>> is matches case-insensitive against the name of
the structure field without the leading `lf' string. For numeric types,
the argument is interpreted as a decimal number (spaces are not
allowed). For a boolean argument, the (value) part is omitted. By
default the boolean attributes are FALSE. Including the attribute name
in the specification sets the field to TRUE. Enumerated fields are
specified using their symbolic name. Name-matching is case-insensitive.
Common parts of the API identifier to make the symbol unique (for
example _CHARSET in ANSI_CHARSET) are removed. String arguments simply
take the value between the brackets. Spaces are included in the output,
case is not changed and there is no escape for the closing-brace.
<P>The default settings are in <A class="tab" href="winfont.html#tab:winfontdefaults">table
12</A>, the attributes are in <A class="tab" href="winfont.html#tab:winfontattributes">table
13</A>.
<P>
<CENTER>
<TABLE BORDER=2 FRAME=box RULES=groups>
<TR VALIGN=top><TD><CODE>charset</CODE> </TD><TD>ansi </TD></TR>
<TR VALIGN=top><TD><CODE>height</CODE> </TD><TD><VAR><<VAR>points</VAR>> ×
font.scale</VAR> </TD></TR>
<TR VALIGN=top><TD><CODE>weigth</CODE> </TD><TD>bold if <<VAR>style</VAR>>
is bold, normal otherwise </TD></TR>
<TR VALIGN=top><TD><CODE>italic</CODE> </TD><TD>TRUE if <<VAR>style</VAR>>
is italic or oblique </TD></TR>
<TR VALIGN=top><TD><CODE>pitch</CODE> </TD><TD>fixed if <<VAR>family</VAR>>
is screen </TD></TR>
<TR VALIGN=top><TD><CODE>family</CODE> </TD><TD>swiss if <<VAR>family</VAR>>
is helvetica, roman if <<VAR>family</VAR>> is times, modern if <<VAR>family</VAR>>
is screen dontcare otherwise. </TD></TR>
<TR VALIGN=top><TD><CODE>face</CODE> </TD><TD><<VAR>family</VAR>> </TD></TR>
</TABLE>
</CENTER>
<TABLE ALIGN=center WIDTH="75%"><TR><TD>
<B>Table 12 : </B>Windows font defaults</TABLE>
<A NAME="tab:winfontdefaults"></A>
<P>
<CENTER>
<TABLE BORDER=2 FRAME=box RULES=groups>
<TR VALIGN=top><TD><CODE>height</CODE>(int)</TD><TD>point-size of the
requested font </TD></TR>
<TR VALIGN=top><TD><CODE>width</CODE>(int)</TD><TD>average width of the
characters </TD></TR>
<TR VALIGN=top><TD><CODE>escapement</CODE>(int)</TD><TD>angle in 1/10
degrees of the baseline </TD></TR>
<TR VALIGN=top><TD><CODE>orientation</CODE>(int)</TD><TD>angle for each
character </TD></TR>
<TR VALIGN=top><TD><CODE>weigth</CODE>(int)</TD><TD>0..1000 scale for
thickness </TD></TR>
<TR VALIGN=top><TD><CODE>italic</CODE> </TD><TD>request italic look </TD></TR>
<TR VALIGN=top><TD><CODE>underline</CODE> </TD><TD>underline all
characters </TD></TR>
<TR VALIGN=top><TD><CODE>strikeout</CODE> </TD><TD>use strikeout-fonts </TD></TR>
<TR VALIGN=top><TD><CODE>charset</CODE>(enum)</TD><TD>character encoding
{<CODE>ansi, oem, symbol</CODE>} </TD></TR>
<TR VALIGN=top><TD><CODE>outprecision</CODE>(enum)</TD><TD>accurate
aspects
{<CODE>character, default, string, stroke</CODE>} </TD></TR>
<TR VALIGN=top><TD><CODE>clipprecision</CODE>(enum)</TD><TD>how the
characters clip
{<CODE>character, default, stroke</CODE>} </TD></TR>
<TR VALIGN=top><TD><CODE>quality</CODE>(enum)</TD><TD>Quality of output
{<CODE>default, draft, proof</CODE>} </TD></TR>
<TR VALIGN=top><TD><CODE>pitch</CODE>(enum)</TD><TD>Spacing attributes
{<CODE>default, fixed, variable</CODE>} </TD></TR>
<TR VALIGN=top><TD><CODE>family</CODE>(enum)</TD><TD>Style of the
characters
{<CODE>decorative, dontcare, modern, roman, script, swiss</CODE>}</TD></TR>
<TR VALIGN=top><TD><CODE>face</CODE>(string)</TD><TD>Use specific font
database </TD></TR>
</TABLE>
</CENTER>
<TABLE ALIGN=center WIDTH="75%"><TR><TD>
<B>Table 13 : </B>Windows font attributes</TABLE>
<A NAME="tab:winfontattributes"></A>
<P>The following example binds the Windows `WingDings' symbol-font:
<PRE class="code">
1 ?- new(F, font(wingdings, roman, 20, 'charset(symbol)')).
</PRE>
<P>The following example uses this font to create an image from such a
character:
<PRE class="code">
:- send(@display, font_alias, wingdings,
font(wingdings, roman, 20, 'charset(symbol)')).
wingding_image(Index, Image) :-
new(Image, image(@nil, 32, 32)),
new(T, text(string('%c', Index), center, wingdings)),
send(T, center, point(16, 16)),
send(Image, draw_in, T),
send(T, done).
test :-
wingding_image(60, Floppy),
send(label(test, Floppy), open).
</PRE>
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