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Asymptote FAQ - Section 4
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Asymptote FAQ - Section 4 <br>
Questions about labels
</h1>
<ul>
<li><a href="#greek" rel=subdocument>Q4.1. How do I get Greek letters like omega to show up in my
labels?</a>
<li><a href="#matlabels" rel=subdocument>Q4.2. Can Asymptote use matrices as labels?</a>
<li><a href="#latexpackage" rel=subdocument>Q4.3. How do I tell Asymptote to load a particular LaTeX package, like
<code>mathptmx</code>?</a>
<li><a href="#internatfonts" rel=subdocument>Q4.4. How can I use international fonts in Asymptote
labels?</a>
<li><a href="#Fourier" rel=subdocument>Q4.5. How can I use Fourier fonts? </a>
<li><a href="#decsep" rel=subdocument>Q4.6. Is there any way to change the default appearance of the decimal
separator, using a comma instead of a dot?</a>
<li><a href="#rotatelabel" rel=subdocument>Q4.7. How can I get a rotated label with the filled box rotated as well so
that it fits the text? </a>
<li><a href="#rotatelabel3D" rel=subdocument>Q4.8. How can I rotate labels in a 3D figure?</a>
<li><a href="#fixedsize" rel=subdocument>Q4.9. How can I draw some squares and circles of a fixed size and put a
label in the middle of them?</a>
<li><a href="#colorssaturation" rel=subdocument>Q4.10. The binary operator * can be used to scale the color of a pen by a
real number. Does this scaling factor have to be less than
1?</a>
<li><a href="#commadecimalseparator" rel=subdocument>Q4.11. Why is the space after the comma decimal separator in my locale so
large?</a>
<li><a href="#hyperref" rel=subdocument>Q4.12. How can I prevent <code>texpreamble("\usepackage[pdftex]{hyperref}")</code> from changing the page size?</a>
</ul><hr>
<h2><A name="greek">
Question 4.1. How do I get Greek letters like omega to show up in my
labels?
</A></h2>
In (La)TeX, Greek letters can be obtained in math mode by prepending a
backslash to the letter name. So for a omega symbol, use
"$\omega$". Everything between the dollar signs is considered to be a math formula. Uppercase
Greek letters can be used by capitalizing the first letter of the name:
<pre>
label("$\omega$",(0,0));
label("$\Omega$",(20,0));
</pre>
<h2><A name="matlabels">
Question 4.2. Can Asymptote use matrices as
labels?
</A></h2>
Yes: <pre>
usepackage("amsmath");
label("$\begin{matrix} 1 & 2 \\\ 1 & 1 \end{matrix}$",(0,0));
</pre>
<h2><A name="latexpackage">
Question 4.3. How do I tell Asymptote to load a particular LaTeX
package, like <code>mathptmx</code>?
</A></h2>
Put <pre>
usepackage("mathptmx");
</pre>
at the beginning of your file. Note: to enable the Adobe Times Roman
font for text, you will also need to say: <pre>
defaultpen(TimesRoman());
</pre>
<h2><A name="internatfonts">
Question 4.4. How can I use international fonts in Asymptote
labels?
</A></h2>
See <A href="http://asymptote.sourceforge.net/doc/unicode.html">http://asymptote.sourceforge.net/doc/unicode.html</A>.
<h2><A name="Fourier">
Question 4.5. How can I use Fourier fonts?
</A></h2>
<pre>
usepackage("fourier");
defaultpen(font("T1","fut\textfamilyextension","m","n"));
</pre>
<h2><A name="decsep">
Question 4.6. Is there any way to change the default appearance of
the decimal separator, using a comma instead of a
dot?
</A></h2>
Just set your locale appropriately: <pre>
locale("it_IT");
usepackage("icomma");
label(format(0.5));
</pre>
<h2><A name="rotatelabel">
Question 4.7. How can I get a rotated label with the filled box
rotated as well so that it fits the text?
</A></h2>
<pre>
frame f;
label(f,"This is some text",white,Fill(blue));
add(rotate(65)*f);
</pre>
<h2><A name="rotatelabel3D">
Question 4.8. How can I rotate labels in a 3D
figure?
</A></h2>
You need to first project the triple to a pair like this:
<pre>
import three;
size(100,100);
draw(rotate(90,project(Z))*"A",O--X);
</pre>
<h2><A name="fixedsize">
Question 4.9. How can I draw some squares and circles of a fixed size
and put a label in the middle of them?
</A></h2>
Fixed-size objects should be drawn on a separate picture and then
added to currentpicture. Here is one way (see also
<A href="http://asymptote.sourceforge.net/gallery/subpictures.asy">http://asymptote.sourceforge.net/gallery/subpictures.asy</A> and <A href="http://asymptote.sourceforge.net/gallery/mosquito.asy">http://asymptote.sourceforge.net/gallery/mosquito.asy</A>): <pre>
real u=2cm;
picture square;
draw(square,scale(u)*shift(-0.5,-0.5)*unitsquare);
picture circle;
draw(circle,scale(0.5u)*unitcircle);
void add(picture pic=currentpicture, Label L, picture object, pair z) {
add(pic,object,z);
label(pic,L,z);
}
add("square",square,(0,0));
add("circle",circle,(5cm,0));
</pre>
<h2><A name="colorssaturation">
Question 4.10. The binary operator * can be used to scale the color
of a pen by a real number. Does this scaling factor have to be less
than 1?
</A></h2>
The scaling factor can be greater than 1. But keep in mind that the
rgb color components saturate at 1.
<p>
Try <pre>
write(cyan); write(0.8*cyan); write(1.5*cyan);
</pre>
and you will quickly see what is going on.
<p>
To get a lighter cyan you can say white+cyan,
which yields rgb(0.5,1,1). If you want something even lighter specify
the rgb colors directly, for example, rgb(0.9,1,1).
<p>
Alternatively, work in cmyk colour space, which is nicer in that it
handles saturation separately from hue:
<p>
0.1*Cyan is light and 0.9*Cyan is dark.
You can also say 0.1*cmyk(red).
<h2><A name="commadecimalseparator">
Question 4.11. Why is the space after the comma decimal separator in
my locale so large?
</A></h2>
LaTeX is treating the comma as punctuation and not as a decimal
separator. The solution is to load the <code>icomma</code> package near the beginning of your file:
<pre>
usepackage("icomma");
</pre>
<h2><A name="hyperref">
Question 4.12. How can I prevent <code>texpreamble("\usepackage[pdftex]{hyperref}")</code> from changing the page size?
</A></h2>
<pre>
texpreamble("\usepackage[pdftex,setpagesize=false]{hyperref}");
</pre>
<hr>
Next: <a href="section5.html" rel=precedes>Questions about arrows</a>.<br>
Back: <a href="section3.html" rev=precedes>Questions about paths</a>.<br>
<a href="index.html" rev=subdocument>Return to contents</a>.<p>
<address>
<A href="http://asymptote.sourceforge.net">Asymptote</A>
- 24 March 2017
</address><br>
Extracted from Asymptote Frequently Asked Questions,
Copyright © 2017 .
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