Difference between revisions of "TikZImages"

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<li>The <tt>$graph_image->tikzLibraries("arrows.meta");</tt> will load the <tt>arrows.meta</tt> Tikz library.</li>
 
<li>The <tt>$graph_image->tikzLibraries("arrows.meta");</tt> will load the <tt>arrows.meta</tt> Tikz library.</li>
 
<li>The actual tikz image is built between <tt>$graph_image->BEGIN_TIKZ</tt> and <tt>END_TIKZ</tt> </li>
 
<li>The actual tikz image is built between <tt>$graph_image->BEGIN_TIKZ</tt> and <tt>END_TIKZ</tt> </li>
</p>
 
<p>
 
Notes: on using this and related Contexts.
 
 
</p>
 
</p>
   
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BEGIN_PGML
 
BEGIN_PGML
   
[@ image(insertGraph($graph_image), width => 300, tex_size => 1000) @]*
+
[@ image($graph_image, width => 300, tex_size => 1000) @]*
   
 
END_PGML
 
END_PGML
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<p>
 
<p>
 
<b>Main Text:</b>
 
<b>Main Text:</b>
This is how to insert the tikz image. Note the <tt>width</tt> and <tt>tex_size</tt> parameters can change the size of the image on the web and as hardcopy.
+
This is how to insert the tikz image. Note the <tt>width</tt> and <tt>tex_size</tt> parameters can change the size of the image on the web and as hardcopy.
 
</p>
 
</p>
  +
<p>Note that you may want to call <tt>$image = image($graph_image, width => 300, tex_size => 1000)</tt> above and use <tt>[@ $image @]*</tt> here while developing the problem. If the <tt>image</tt> call occurs inside the BEGIN_PGML/END_PGML section, then you will not get the warnings from failed image generation. You will instead get no image, and no reason as to why.
 
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<ul>
 
<ul>
 
<li>POD documentation: [https://webwork.maa.org/pod/pg/macros/PGtikz.html PGtikz.pl]</li>
 
<li>POD documentation: [https://webwork.maa.org/pod/pg/macros/PGtikz.html PGtikz.pl]</li>
<li>PG macro: [http://cvs.webwork.rochester.edu/viewcvs.cgi/pg/macros/#dirlist nameOfMacro.pl]</li>
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<li>PG macro: [https://github.com/openwebwork/pg/blob/PG-2.16/macros/PGtikz.pl PGtikz.pl]</li>
  +
<!--<li>PG macro: [https://github.com/openwebwork/pg/blob/master/macros/PGtikz.pl PGtikz.pl]</li>-->
 
</ul>
 
</ul>

Latest revision as of 22:35, 28 April 2021

Graphic Images, TikZImages


This example shows how to create an image/plot using Tikz.

Problem Techniques Index

PG problem file Explanation
DOCUMENT();
loadMacros(
"PGstandard.pl",
"MathObjects.pl",
"PGML.pl",
"PGtikz.pl"
);
TEXT(beginproblem());

Initialization: It is important to include the PGtikz.pl macro.

$graph_image = createTikZImage();
$graph_image->tikzLibraries("arrows.meta");

$graph_image->BEGIN_TIKZ
\draw[<->,thick] (-11,0) -- (11,0) node[above left,outer sep=2pt]{\(x\)};
\draw[<->,thick] (0,-11) -- (0,11) node[below right,outer sep=2pt]{\(y\)};
\foreach \x in {-10,-8,...,-2,2,4,...,10} \draw[thin] (\x,5pt) -- (\x,-5pt) node[below]{\(\x\)};
\foreach \y in {-10,-8,...,-2,2,4,...,10} \draw[thin] (5pt,\y) -- (-5pt,\y) node[left]{\(\y\)};
\draw[<->,red] plot[domain={-3.2+$a}:{3.2+$a}] (\x,{pow(\x-$a,2)+$b});
END_TIKZ


Setup:

  • The createTikZImage() function creates an image to be built using tikz.
  • By default an 'svg' image will be generated, which will generally look better than a 'png image.
  • In certain cases the 'svg' creation methods do not give the correct output, and so in those cases a 'png' image may be generated instead by adding $graph_image->ext('png');.
  • The $graph_image->tikzLibraries("arrows.meta"); will load the arrows.meta Tikz library.
  • The actual tikz image is built between $graph_image->BEGIN_TIKZ and END_TIKZ
BEGIN_PGML

[@ image($graph_image, width => 300, tex_size => 1000) @]*

END_PGML

Main Text: This is how to insert the tikz image. Note the width and tex_size parameters can change the size of the image on the web and as hardcopy.

Note that you may want to call $image = image($graph_image, width => 300, tex_size => 1000) above and use [@ $image @]* here while developing the problem. If the image call occurs inside the BEGIN_PGML/END_PGML section, then you will not get the warnings from failed image generation. You will instead get no image, and no reason as to why.

ENDDOCUMENT();

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Problem Techniques Index