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<title>Enlaces y texto flotante</title>
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<h1>Enlaces y texto flotante</h1>
Este tutorial explica cmo incluir enlaces (internos y externos) y muestra una nueva
manera de imprimir texto. Tambin incluye un intrprete rudimentario de HTML.
<div class="source">
<pre><code><?php
<span class="kw">require(</span><span class="str">'fpdf.php'</span><span class="kw">);
class </span>PDF <span class="kw">extends </span>FPDF
<span class="kw">{
var </span>$B<span class="kw">;
var </span>$I<span class="kw">;
var </span>$U<span class="kw">;
var </span>$HREF<span class="kw">;
function </span>PDF<span class="kw">(</span>$orientation<span class="kw">=</span><span class="str">'P'</span><span class="kw">, </span>$unit<span class="kw">=</span><span class="str">'mm'</span><span class="kw">, </span>$size<span class="kw">=</span><span class="str">'A4'</span><span class="kw">)
{
</span><span class="cmt">// Llama al constructor de la clase padre
</span>$<span class="kw">this-></span>FPDF<span class="kw">(</span>$orientation<span class="kw">,</span>$unit<span class="kw">,</span>$size<span class="kw">);
</span><span class="cmt">// Iniciacin de variables
</span>$<span class="kw">this-></span>B <span class="kw">= </span>0<span class="kw">;
</span>$<span class="kw">this-></span>I <span class="kw">= </span>0<span class="kw">;
</span>$<span class="kw">this-></span>U <span class="kw">= </span>0<span class="kw">;
</span>$<span class="kw">this-></span>HREF <span class="kw">= </span><span class="str">''</span><span class="kw">;
}
function </span>WriteHTML<span class="kw">(</span>$html<span class="kw">)
{
</span><span class="cmt">// Intrprete de HTML
</span>$html <span class="kw">= </span>str_replace<span class="kw">(</span><span class="str">"\n"</span><span class="kw">,</span><span class="str">' '</span><span class="kw">,</span>$html<span class="kw">);
</span>$a <span class="kw">= </span>preg_split<span class="kw">(</span><span class="str">'/<(.*)>/U'</span><span class="kw">,</span>$html<span class="kw">,-</span>1<span class="kw">,</span>PREG_SPLIT_DELIM_CAPTURE<span class="kw">);
foreach(</span>$a <span class="kw">as </span>$i<span class="kw">=></span>$e<span class="kw">)
{
if(</span>$i<span class="kw">%</span>2<span class="kw">==</span>0<span class="kw">)
{
</span><span class="cmt">// Text
</span><span class="kw">if(</span>$<span class="kw">this-></span>HREF<span class="kw">)
</span>$<span class="kw">this-></span>PutLink<span class="kw">(</span>$<span class="kw">this-></span>HREF<span class="kw">,</span>$e<span class="kw">);
else
</span>$<span class="kw">this-></span>Write<span class="kw">(</span>5<span class="kw">,</span>$e<span class="kw">);
}
else
{
</span><span class="cmt">// Etiqueta
</span><span class="kw">if(</span>$e<span class="kw">[</span>0<span class="kw">]==</span><span class="str">'/'</span><span class="kw">)
</span>$<span class="kw">this-></span>CloseTag<span class="kw">(</span>strtoupper<span class="kw">(</span>substr<span class="kw">(</span>$e<span class="kw">,</span>1<span class="kw">)));
else
{
</span><span class="cmt">// Extraer atributos
</span>$a2 <span class="kw">= </span>explode<span class="kw">(</span><span class="str">' '</span><span class="kw">,</span>$e<span class="kw">);
</span>$tag <span class="kw">= </span>strtoupper<span class="kw">(</span>array_shift<span class="kw">(</span>$a2<span class="kw">));
</span>$attr <span class="kw">= array();
foreach(</span>$a2 <span class="kw">as </span>$v<span class="kw">)
{
if(</span>preg_match<span class="kw">(</span><span class="str">'/([^=]*)=["\']?([^"\']*)/'</span><span class="kw">,</span>$v<span class="kw">,</span>$a3<span class="kw">))
</span>$attr<span class="kw">[</span>strtoupper<span class="kw">(</span>$a3<span class="kw">[</span>1<span class="kw">])] = </span>$a3<span class="kw">[</span>2<span class="kw">];
}
</span>$<span class="kw">this-></span>OpenTag<span class="kw">(</span>$tag<span class="kw">,</span>$attr<span class="kw">);
}
}
}
}
function </span>OpenTag<span class="kw">(</span>$tag<span class="kw">, </span>$attr<span class="kw">)
{
</span><span class="cmt">// Etiqueta de apertura
</span><span class="kw">if(</span>$tag<span class="kw">==</span><span class="str">'B' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'I' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'U'</span><span class="kw">)
</span>$<span class="kw">this-></span>SetStyle<span class="kw">(</span>$tag<span class="kw">,</span>true<span class="kw">);
if(</span>$tag<span class="kw">==</span><span class="str">'A'</span><span class="kw">)
</span>$<span class="kw">this-></span>HREF <span class="kw">= </span>$attr<span class="kw">[</span><span class="str">'HREF'</span><span class="kw">];
if(</span>$tag<span class="kw">==</span><span class="str">'BR'</span><span class="kw">)
</span>$<span class="kw">this-></span>Ln<span class="kw">(</span>5<span class="kw">);
}
function </span>CloseTag<span class="kw">(</span>$tag<span class="kw">)
{
</span><span class="cmt">// Etiqueta de cierre
</span><span class="kw">if(</span>$tag<span class="kw">==</span><span class="str">'B' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'I' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'U'</span><span class="kw">)
</span>$<span class="kw">this-></span>SetStyle<span class="kw">(</span>$tag<span class="kw">,</span>false<span class="kw">);
if(</span>$tag<span class="kw">==</span><span class="str">'A'</span><span class="kw">)
</span>$<span class="kw">this-></span>HREF <span class="kw">= </span><span class="str">''</span><span class="kw">;
}
function </span>SetStyle<span class="kw">(</span>$tag<span class="kw">, </span>$enable<span class="kw">)
{
</span><span class="cmt">// Modificar estilo y escoger la fuente correspondiente
</span>$<span class="kw">this-></span>$tag <span class="kw">+= (</span>$enable <span class="kw">? </span>1 <span class="kw">: -</span>1<span class="kw">);
</span>$style <span class="kw">= </span><span class="str">''</span><span class="kw">;
foreach(array(</span><span class="str">'B'</span><span class="kw">, </span><span class="str">'I'</span><span class="kw">, </span><span class="str">'U'</span><span class="kw">) as </span>$s<span class="kw">)
{
if(</span>$<span class="kw">this-></span>$s<span class="kw">></span>0<span class="kw">)
</span>$style <span class="kw">.= </span>$s<span class="kw">;
}
</span>$<span class="kw">this-></span>SetFont<span class="kw">(</span><span class="str">''</span><span class="kw">,</span>$style<span class="kw">);
}
function </span>PutLink<span class="kw">(</span>$URL<span class="kw">, </span>$txt<span class="kw">)
{
</span><span class="cmt">// Escribir un hiper-enlace
</span>$<span class="kw">this-></span>SetTextColor<span class="kw">(</span>0<span class="kw">,</span>0<span class="kw">,</span>255<span class="kw">);
</span>$<span class="kw">this-></span>SetStyle<span class="kw">(</span><span class="str">'U'</span><span class="kw">,</span>true<span class="kw">);
</span>$<span class="kw">this-></span>Write<span class="kw">(</span>5<span class="kw">,</span>$txt<span class="kw">,</span>$URL<span class="kw">);
</span>$<span class="kw">this-></span>SetStyle<span class="kw">(</span><span class="str">'U'</span><span class="kw">,</span>false<span class="kw">);
</span>$<span class="kw">this-></span>SetTextColor<span class="kw">(</span>0<span class="kw">);
}
}
</span>$html <span class="kw">= </span><span class="str">'Ahora puede imprimir fcilmente texto mezclando diferentes estilos: <b>negrita</b>, <i>itlica</i>,
<u>subrayado</u>, o <b><i><u>todos a la vez</u></i></b>!<br><br>Tambin puede incluir enlaces en el
texto, como <a href="http://www.fpdf.org">www.fpdf.org</a>, o en una imagen: pulse en el logotipo.'</span><span class="kw">;
</span>$pdf <span class="kw">= new </span>PDF<span class="kw">();
</span><span class="cmt">// Primera pgina
</span>$pdf<span class="kw">-></span>AddPage<span class="kw">();
</span>$pdf<span class="kw">-></span>SetFont<span class="kw">(</span><span class="str">'Arial'</span><span class="kw">,</span><span class="str">''</span><span class="kw">,</span>20<span class="kw">);
</span>$pdf<span class="kw">-></span>Write<span class="kw">(</span>5<span class="kw">,</span><span class="str">'Para saber qu hay de nuevo en este tutorial, pulse '</span><span class="kw">);
</span>$pdf<span class="kw">-></span>SetFont<span class="kw">(</span><span class="str">''</span><span class="kw">,</span><span class="str">'U'</span><span class="kw">);
</span>$link <span class="kw">= </span>$pdf<span class="kw">-></span>AddLink<span class="kw">();
</span>$pdf<span class="kw">-></span>Write<span class="kw">(</span>5<span class="kw">,</span><span class="str">'aqu'</span><span class="kw">,</span>$link<span class="kw">);
</span>$pdf<span class="kw">-></span>SetFont<span class="kw">(</span><span class="str">''</span><span class="kw">);
</span><span class="cmt">// Segunda pgina
</span>$pdf<span class="kw">-></span>AddPage<span class="kw">();
</span>$pdf<span class="kw">-></span>SetLink<span class="kw">(</span>$link<span class="kw">);
</span>$pdf<span class="kw">-></span>Image<span class="kw">(</span><span class="str">'logo.png'</span><span class="kw">,</span>10<span class="kw">,</span>12<span class="kw">,</span>30<span class="kw">,</span>0<span class="kw">,</span><span class="str">''</span><span class="kw">,</span><span class="str">'http://www.fpdf.org'</span><span class="kw">);
</span>$pdf<span class="kw">-></span>SetLeftMargin<span class="kw">(</span>45<span class="kw">);
</span>$pdf<span class="kw">-></span>SetFontSize<span class="kw">(</span>14<span class="kw">);
</span>$pdf<span class="kw">-></span>WriteHTML<span class="kw">(</span>$html<span class="kw">);
</span>$pdf<span class="kw">-></span>Output<span class="kw">();
</span>?></code></pre>
</div>
<p class='demo'><a href='tuto6.php' target='_blank' class='demo'>[Demo]</a></p>
El nuevo mtodo para imprimir texto es <a href='../doc/write.htm'>Write()</a>.
Se parece mucho a <a href='../doc/multicell.htm'>MultiCell()</a>; las diferencias son:
<ul>
<li>El lmite de la lnea est en el margen derecho y la siguiente lnea
empieza en el izquierdo</li>
<li>La posicin actual se establece al final del texto</li>
</ul>
As que le permite escribir un texto, alterar el estilo de la fuente, y continuar
en el punto exacto donde lo dej. Sin embargo, no puede justificar el texto simultneamente
a derecha y a izquierda.
<br>
<br>
Este mtodo se usa en la primera pgina para aadir un enlace que apunta a la segunda pgina.
El principio de la frase se escribe en un estilo normal, despus cambiamos a subrayado y la
terminamos. El enlace se crea con <a href='../doc/addlink.htm'>AddLink()</a>, que devuelve el identificador del enlace.
El identificador se pasa como tercer parmetro a Write(). Una vez que la segunda pgina se
ha creado, usamos <a href='../doc/setlink.htm'>SetLink()</a> para hacer que el enlace apunte al principio de la
pgina actual.
<br>
<br>
Deespus ponemos una imagen con un enlace en ella. Un enlace externo apunta a una URL.
La URL se pasa como el ltimo parmetro de <a href='../doc/image.htm'>Image()</a>.
<br>
<br>
Finalmente, el margen izquierdo se modifica despus de la imagen con <a href='../doc/setleftmargin.htm'>SetLeftMargin()</a> y se
escribe texto en formato HTML. Se utiliza un intrprete HTML para esto, basado en les expresiones
regulares. Las etiquetas reconocidas son <b>, <i>, <u>, <a> y <br>;
las dems se ignoran. El intrprete tambin usa el mtodo Write(). Se pone un enlace externo de la
misma manera que uno interno (como tercer parmetro de Write()). Observe que <a href='../doc/cell.htm'>Cell()</a> tambin
permite incluir enlaces.
</body>
</html>