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<H2><A NAME="SECTION0001710000000000000000"></A><A NAME="escape-sequence"></A><a id='l2h-290' xml:id='l2h-290'></a>
<BR>
17.1 Escape sequences
</H2>
<P>
A text string may contain escape characters that control its
appearance. The escape sequences all start with the letter
``<code>/</code>''. Thus, to display ``<code>/</code>'' itself, you must write
``<code>//</code>''.
<P>
<BLOCKQUOTE>
<b>Restrictions</b>: <code>/h</code>, <code>/v</code>, and <code>/a</code> <em>must</em>
appear in the beginning of a string.
</BLOCKQUOTE>
<P>
<a id='l2h-293' xml:id='l2h-293'></a>
<P>
<a id='l2h-294' xml:id='l2h-294'></a>
<P>
<DL>
<DT><STRONG><code>/a<var>dd</var></code></STRONG></DT>
<DD>Specifies the angle of the text. Parameter <var>dd</var> is a number
between -360 to 360. Value 0 means left-to-right text, 90 means
bottom-to-up, etc.
If you want to print numbers right after an angle specification, put
<code>{</code> between the angle and the number. For example, the below
code shows string "<code>"100"</code>" at a 60-degree angle.
<P>
<div class="verbatim"><pre>
"/a60{}100"
</pre></div>
<a id='l2h-295' xml:id='l2h-295'></a>
<P>
</DD>
<DT><STRONG><code>/h</code><var>A</var>:</STRONG></DT>
<DD>Specifies horizontal alignment of the text. <var>A</var> is one of
"<code>L</code>" (left alignment), "<code>R</code>" (right alignment), or "<code>C</code>"
(center alignment).
<P>
</DD>
<DT><STRONG><code>/v</code><var>A</var>:</STRONG></DT>
<DD>Specifies vertical alignment of the text. <var>A</var> is one of "<code>B</code>"
(bottom), "<code>T</code>" (top), or "<code>M</code>" (middle).
<P>
</DD>
<DT><STRONG><code>/T</code></STRONG></DT>
<DD>:
Switch to Times font family.
<a id='l2h-296' xml:id='l2h-296'></a>
<P>
</DD>
<DT><STRONG><code>/H</code>:</STRONG></DT>
<DD>Switch to Helvetica font family.
<a id='l2h-297' xml:id='l2h-297'></a>
</DD>
<DT><STRONG><code>/C</code>:</STRONG></DT>
<DD>Switch to Courier font family.
<a id='l2h-298' xml:id='l2h-298'></a>
</DD>
<DT><STRONG><code>/B</code>:</STRONG></DT>
<DD>Switch to Bookman-Demi font family.
<a id='l2h-299' xml:id='l2h-299'></a>
</DD>
<DT><STRONG><code>/A</code>:</STRONG></DT>
<DD>Switch to AvantGarde-Book font family.
<a id='l2h-300' xml:id='l2h-300'></a>
</DD>
<DT><STRONG><code>/P</code>:</STRONG></DT>
<DD>Switch to Palatino font family.
<a id='l2h-301' xml:id='l2h-301'></a>
</DD>
<DT><STRONG><code>/S</code>:</STRONG></DT>
<DD>Switch to Symbol font family.
<a id='l2h-302' xml:id='l2h-302'></a>
</DD>
<DT><STRONG><code>/F{<var>family</var>}</code>:</STRONG></DT>
<DD>Switch to <var>family</var> font family.
The below example draws string "Funny" using ZapfDingbat font
(which produces some meaningless output).
<a id='l2h-303' xml:id='l2h-303'></a>
<P>
<div class="verbatim"><pre>
<a href="module-canvas.html">canvas.</a>show(100, 200, "/F{ZapfDingbat}Funny")
</pre></div>
<P>
The list of available fonts are the following:
<P>
<BLOCKQUOTE>
Bookman-Demi Bookman-Light Courier AvantGarde-Book AvantGarde-Demi
Helvetica Helvetica-Narrow Palatino NewCenturySchlbk Times
Symbol ZapfChancery-MediumItalic ZapfChancery-Medium-Italic ZapfDingbats
</BLOCKQUOTE>
<P>
</DD>
<DT><STRONG><code>/b</code>:</STRONG></DT>
<DD>Switch to bold typeface.
<a id='l2h-304' xml:id='l2h-304'></a>
</DD>
<DT><STRONG><code>/i</code>:</STRONG></DT>
<DD>Switch to italic typeface.
<a id='l2h-305' xml:id='l2h-305'></a>
</DD>
<DT><STRONG><code>/o</code>:</STRONG></DT>
<DD>Switch to oblique typeface.
<a id='l2h-306' xml:id='l2h-306'></a>
</DD>
<DT><STRONG><code>/</code><var>dd</var>:</STRONG></DT>
<DD>Set font size to <var>dd</var> points.
<a id='l2h-291' xml:id='l2h-291'></a><a id='l2h-307' xml:id='l2h-307'></a>
<P>
<div class="verbatim"><pre>
"/20{}2001 space odyssey!"
</pre></div>
<P>
</DD>
<DT><STRONG><code>/c</code><var>dd</var>:</STRONG></DT>
<DD>Set gray-scale to 0.<var>dd</var>.
Gray-scale of 0 means black, 1 means white.
<a id='l2h-292' xml:id='l2h-292'></a>
<P>
</DD>
<DT><STRONG><code>//</code>, <code>/{</code>, <code>/}</code>:</STRONG></DT>
<DD>Display `/', `}', or `{'.
</DD>
<DT><STRONG><code>{ ... }</code>:</STRONG></DT>
<DD>Limit the scope of escape sequences. For example,
<code>"{/10{/20Big text} and small text}"</code>
will display <code>"Big Text"</code> using
a 20-point font, and <code>"and small text"</code> using a 10-point font.
<a id='l2h-308' xml:id='l2h-308'></a>
<P>
</DD>
<DT><STRONG><code><SPAN CLASS="MATH"><IMG
WIDTH="12" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img1.png"
ALT="$\backslash$"></SPAN>n</code>:</STRONG></DT>
<DD>Break the line.
<a id='l2h-309' xml:id='l2h-309'></a>
</DD>
</DL>
<P>
<IMG
WIDTH="944" HEIGHT="614" ALIGN="BOTTOM" BORDER="0"
SRC="./fonttest.png"
ALT="Image fonttest">
<P>
<b> Font usage example </b>
<P>
Below is the source code that produces the above chart.
../demos/fonttest.py
<P>
<div class="verbatim"><pre>
from pychart import *
can = <a href="module-canvas.html">canvas.</a>default_canvas()
x, y = (100, 500)
def show_text(str):
global x, y
can.show(x, y, str)
can.show(x + 200, y, "/12/C" + font.quotemeta(str))
y -= 20
show_text("/12/hLLeft align")
show_text("/12/hRRight align")
show_text("/12/hCCenter align")
show_text("/a20/12/hRAngled text")
def show_textv(str):
global x, y
can.show(x, y, str)
x += 150
y -= 40
x = 100
show_textv("/12/vT//12//vTTop align")
show_textv("/12/vM//12//vT/12Middle align")
show_textv("/12/vB//12//vT/12Bottom align")
y -= 40
x = 100
show_text("/16/HHelvetica")
show_text("/12/CCourier")
show_text("/12/NHelvetica-Narrow")
show_text("/12/PPalatino-Roman")
show_text("/12/AAvantgarde")
show_text("/12/T/iTimes-Italic")
show_text("/12/F{ZapfDingbats}ZapfDingbats")
</pre></div>
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<span class="release-info">Documentation released on July 2, 2005.</span>
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