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69 lines
16 KiB
HTML
69 lines
16 KiB
HTML
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<HTML>
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<HEAD>
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1">
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<TITLE>Links and flowing text</TITLE>
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<LINK TYPE="text/css" REL="stylesheet" HREF="../fpdf.css">
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</HEAD>
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<BODY>
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<H2>Links and flowing text</H2>
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This tutorial explains how to insert links (internal and external) and shows a new text writing
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mode. It also contains a rudimentary HTML parser.
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<BR>
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<BR>
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<TABLE WIDTH="100%" STYLE="color:#4040C0; border-style:ridge" BORDERCOLORLIGHT="#B0B0E0" BORDERCOLORDARK="#000000" BORDER="2" CELLPADDING=6 CELLSPACING=0 BGCOLOR="#F0F5FF"><TR><TD style="border-width:0px">
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<NOBR><code><font color="#000000">
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<?php<br>define<font class="kw">(</font><font class="str">'FPDF_FONTPATH'</font><font class="kw">,</font><font class="str">'font/'</font><font class="kw">);<br>require(</font><font class="str">'fpdf.php'</font><font class="kw">);<br><br>class </font>PDF <font class="kw">extends </font>FPDF<br><font class="kw">{<br>var </font>$B<font class="kw">;<br>var </font>$I<font class="kw">;<br>var </font>$U<font class="kw">;<br>var </font>$HREF<font class="kw">;<br><br>function </font>PDF<font class="kw">(</font>$orientation<font class="kw">=</font><font class="str">'P'</font><font class="kw">,</font>$unit<font class="kw">=</font><font class="str">'mm'</font><font class="kw">,</font>$format<font class="kw">=</font><font class="str">'A4'</font><font class="kw">)<br>{<br> </font><font class="cmt">//Call parent constructor<br> </font>$<font class="kw">this-></font>FPDF<font class="kw">(</font>$orientation<font class="kw">,</font>$unit<font class="kw">,</font>$format<font class="kw">);<br> </font><font class="cmt">//Initialization<br> </font>$<font class="kw">this-></font>B<font class="kw">=</font>0<font class="kw">;<br> </font>$<font class="kw">this-></font>I<font class="kw">=</font>0<font class="kw">;<br> </font>$<font class="kw">this-></font>U<font class="kw">=</font>0<font class="kw">;<br> </font>$<font class="kw">this-></font>HREF<font class="kw">=</font><font class="str">''</font><font class="kw">;<br>}<br><br>function </font>WriteHTML<font class="kw">(</font>$html<font class="kw">)<br>{<br> </font><font class="cmt">//HTML parser<br> </font>$html<font class="kw">=</font>str_replace<font class="kw">(</font><font class="str">"\n"</font><font class="kw">,</font><font class="str">' '</font><font class="kw">,</font>$html<font class="kw">);<br> </font>$a<font class="kw">=</font>preg_split<font class="kw">(</font><font class="str">'/<(.*)>/U'</font><font class="kw">,</font>$html<font class="kw">,-</font>1<font class="kw">,</font>PREG_SPLIT_DELIM_CAPTURE<font class="kw">);<br> foreach(</font>$a <font class="kw">as </font>$i<font class="kw">=></font>$e<font class="kw">)<br> {<br> if(</font>$i<font class="kw">%</font>2<font class="kw">==</font>0<font class="kw">)<br> {<br> </font><font class="cmt">//Text<br> </font><font class="kw">if(</font>$<font class="kw">this-></font>HREF<font class="kw">)<br> </font>$<font class="kw">this-></font>PutLink<font class="kw">(</font>$<font class="kw">this-></font>HREF<font class="kw">,</font>$e<font class="kw">);<br> else<br> </font>$<font class="kw">this-></font>Write<font class="kw">(</font>5<font class="kw">,</font>$e<font class="kw">);<br> }<br> else<br> {<br> </font><font class="cmt">//Tag<br> </font><font class="kw">if(</font>$e<font class="kw">{</font>0<font class="kw">}==</font><font class="str">'/'</font><font class="kw">)<br> </font>$<font class="kw">this-></font>CloseTag<font class="kw">(</font>strtoupper<font class="kw">(<
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</font>
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</code></NOBR></TD></TR></TABLE><P></P>
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<SCRIPT>
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<!--
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if(document.location.href.indexOf('http:')==0)
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{
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document.write("<P CLASS='demo'><A HREF='tuto6.php' TARGET='_blank' CLASS='demo'>[Demo]</A></P>");
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}
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//-->
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</SCRIPT>
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The new method to print text is <A HREF='../doc/write.htm'>Write()</A>. It is very close to <A HREF='../doc/multicell.htm'>MultiCell()</A>; the differences
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are:
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<UL>
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<LI>The end of line is at the right margin and the next line begins at the left one
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<LI>The current position moves at the end of the text
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</UL>
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So it allows to write a chunk of text, alter the font style, then continue from the exact
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place we left it. On the other hand, you cannot full justify it.
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<BR>
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<BR>
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The method is used on the first page to put a link pointing to the second one. The beginning of
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the sentence is written in regular style, then we switch to underline and finish it. The link
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is created with <A HREF='../doc/addlink.htm'>AddLink()</A>, which returns a link identifier. The identifier is
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passed as third parameter of Write(). Once the second page is created, we use <A HREF='../doc/setlink.htm'>SetLink()</A> to
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make the link point to the beginning of the current page.
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<BR>
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<BR>
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Then we put an image with a link on it. An external link points to an URL (HTTP, mailto...).
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The URL is simply passed as last parameter of <A HREF='../doc/image.htm'>Image()</A>.
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Note that external links do not work when the PDF is displayed inside Netscape's plug-in.
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<BR>
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<BR>
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Finally, the left margin is moved after the image with <A HREF='../doc/setleftmargin.htm'>SetLeftMargin()</A> and some text in
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HTML format is output. An HTML parser is used for this, based on the regular expression splitting
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function preg_split() and the option PREG_SPLIT_DELIM_CAPTURE (introduced in PHP 4.0.5) which
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allows to fetch the separators as well (in this case the tags). If you use an older version of
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PHP, replace the line with this one:
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<BR>
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<BR>
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<TABLE WIDTH="100%" STYLE="color:#4040C0; border-style:ridge" BORDERCOLORLIGHT="#B0B0E0" BORDERCOLORDARK="#000000" BORDER="2" CELLPADDING=6 CELLSPACING=0 BGCOLOR="#F0F5FF"><TR><TD style="border-width:0px">
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<NOBR><code><font color="#000000">
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$a<font class="kw">=</font>preg_split<font class="kw">(</font><font class="str">'/[<>]/'</font><font class="kw">,</font>$html<font class="kw">);</font><br>
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</font>
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</code></NOBR></TD></TR></TABLE><P></P>
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which is less strict but gives the same results with valid HTML.
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<BR>
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Recognized tags are <B>, <I>, <U>, <A> and <BR>; the others are
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ignored. The parser also makes use of the Write() method. An external link is put the same way as
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an internal one (third parameter of Write()).
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<BR>
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Note that <A HREF='../doc/cell.htm'>Cell()</A> also allows to put links.
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</BODY>
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</HTML>
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