269 lines
24 KiB
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269 lines
24 KiB
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Format options for barcodes</title><link rel="stylesheet" type="text/css" href="manual.css"><meta name="generator" content="DocBook XSL Stylesheets V1.76.0"><link rel="home" href="index.html" title="JpGraph Manual"><link rel="up" href="ch24.html" title="Chapter 24. Linear Barcodes (One Dimensional Barcodes)"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Format options for barcodes</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center">Chapter 24. Linear Barcodes (One Dimensional Barcodes)</th><td width="20%" align="right"> </td></tr></table><hr></div><div class="sect1" title="Format options for barcodes"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2596824"></a>Format options for barcodes</h2></div></div></div>
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<div class="sect2" title="Adjusting the encodation process"><div class="titlepage"><div><div><h3 class="title"><a name="id2596909"></a>Adjusting the encodation process</h3></div></div></div>
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<p>For the encoding there is basically only one modification available. </p>
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<p>For those symbologies that include an optional checksum it is possible to
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enable or disable this calculation.</p>
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<p>The following symbologies may have optional checksum character(s)</p>
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<p>
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</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
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<p>Industrial 2 of 5</p>
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</li><li class="listitem">
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<p>Interleaved 2 of 5</p>
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</li><li class="listitem">
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<p>Code 39</p>
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</li><li class="listitem">
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<p>Code 39 Extended</p>
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</li><li class="listitem">
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<p>Code 11</p>
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</li></ol></div><p>
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</p>
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<p>Turning on/off checksum calculation for other symbologies will have no affect.
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Checksum calculation is enabled with a call to <code class="code">AddChecksum()</code> on the
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chosen backend. </p>
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<p>For example to augment the previous "CODE 39" example to include the checksum
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the code would be changed to</p>
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<p>
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</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
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</pre></td><td class="hl-main" valign="top"><pre><span class="hl-inlinetags"><?php</span><span class="hl-code">
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</span><span class="hl-var">$symbology</span><span class="hl-code"> = </span><span class="hl-identifier">BarcodeFactory</span><span class="hl-code">::</span><span class="hl-identifier">Create</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">ENCODING_CODE39</span><span class="hl-code"> </span><span class="hl-brackets">)</span><span class="hl-code">;
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</span><span class="hl-var">$symbology</span><span class="hl-code">-></span><span class="hl-identifier">AddChecksum</span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-code">;
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</span><span class="hl-var">$barcode</span><span class="hl-code"> = </span><span class="hl-identifier">BackendFactory</span><span class="hl-code"> ::</span><span class="hl-identifier">Create</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">IMAGE</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-var">$symbology</span><span class="hl-brackets">)</span><span class="hl-code">;
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</span><span class="hl-var">$barcode</span><span class="hl-code">-></span><span class="hl-identifier">Stroke</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">ABC123</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">;
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</span><span class="hl-inlinetags">?></span></pre></td></tr></table></div><p>
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</p>
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<p>Which would give the result shown in <a class="xref" href="ch24s08.html#fig.adding-chk-c39" title='Figure 24.6. Encoding "ABC123" with CODE 39 adding checksum (checksum=4).'>Figure 24.6. Encoding "ABC123" with CODE 39 adding checksum (checksum=4).</a></p>
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<p>
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</p><div class="figure"><a name="fig.adding-chk-c39"></a><p class="title"><b>Figure 24.6. Encoding "ABC123" with CODE 39 adding checksum (checksum=4).</b></p><div class="figure-contents">
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<div class="mediaobject"><img src="images/barcode_c39_abc123_ex3.png" alt='Encoding "ABC123" with CODE 39 adding checksum (checksum=4).'></div>
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</div></div><p><br class="figure-break">
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</p>
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</div>
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<div class="sect2" title="Selecting output format"><div class="titlepage"><div><div><h3 class="title"><a name="id2597037"></a>Selecting output format</h3></div></div></div>
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<p>The output format can be adjusted by specifying/creating the appropriate
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backend. The library supports image and postscript (and encapsulated postscript)
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backends. </p>
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<p>The backend is created by calling the static factory method </p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">BackendFactory::Create($aBackend,$aEncoder,$aReport=false)</code></p>
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</li></ul></div><p>
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</p>
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<p>So to create an image backend the following code is needed</p>
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<p>
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</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
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</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$barcode = BackendFactory::Create (BACKEND_IMAGE ,$symbology);</span></pre></td></tr></table></div><p>
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</p>
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<p>Where "<code class="code">$symbology</code>" is the chosen symbology as created by the
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<code class="code">BarcodeFactory::Create()</code> factory method. Please note that both
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factory functions are called as static methods.</p>
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<p>The output format is specified by using one of the following symbolic
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defines</p>
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<p>
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</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
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<p><code class="code">BACKEND_IMAGE</code>, Creates a standard JPEG or PNG
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(default) image</p>
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</li><li class="listitem">
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<p><code class="code">BACKEND_PS</code>, Creates a standard postscript file as
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output. It is possible to modify this output to become EPS
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(Encapsulated postscript) by calling the <code class="code">SetEPS()</code>
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method on the backend as the following code snippet shows</p>
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<p>
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</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
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</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$barcode = BackendFactory::Create (BACKEND_PS,$symbology);
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$barcode->SetEPS()</span></pre></td></tr></table></div><p>
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</p>
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<p>Please note that for the postscript backend the postscript code is
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returned as a string from the <code class="code">Stroke()</code> method. </p>
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</li></ol></div><p>
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</p>
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<p>To send the created stream (either image or postscript) back to the browser or
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to a file the <code class="code">Backend::Stroke()</code> method shall be used. The parameter
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to the Stroke() method shall be the string to be encoded.</p>
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<p>Assume we want to create an image that is sent back to the browser. We would
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then use the following code</p>
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<p>
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</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
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</pre></td><td class="hl-main" valign="top"><pre><span class="hl-inlinetags"><?php</span><span class="hl-code">
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</span><span class="hl-var">$symbology</span><span class="hl-code"> = </span><span class="hl-identifier">BarcodeFactory</span><span class="hl-code">::</span><span class="hl-identifier">Create</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">ENCODING_CODE128</span><span class="hl-code"> </span><span class="hl-brackets">)</span><span class="hl-code">;
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</span><span class="hl-var">$barcode</span><span class="hl-code"> = </span><span class="hl-identifier">BackendFactory</span><span class="hl-code"> ::</span><span class="hl-identifier">Create</span><span class="hl-brackets">(</span><span class="hl-identifier">BACKEND_IMAGE</span><span class="hl-code">, </span><span class="hl-var">$symbology</span><span class="hl-brackets">)</span><span class="hl-code">;
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</span><span class="hl-var">$barcode</span><span class="hl-code">-></span><span class="hl-identifier">Stroke</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">ABC123</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">;
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</span><span class="hl-inlinetags">?></span></pre></td></tr></table></div><p>
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</p>
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<p>It is also possible to write the barcode directly to a file by specifying a
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second argument to the <code class="code">Stroke()</code> method above. So if we instead
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wanted the barcode to be stored in the file
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"<code class="filename">/tmp/barcode.png</code>" we could write </p>
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<p>
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</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
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</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$symbology = BarcodeFactory::Create (ENCODING_CODE128 );
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$barcode = BackendFactory ::Create(BACKEND_IMAGE, $symbology);
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$barcode->Stroke('ABC123','/tmp/barcode.png');</span></pre></td></tr></table></div><p>
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</p>
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<p>
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</p><div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3>
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<p>There is no automatic added extension to the file name.</p>
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</div><p>
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</p>
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<p>Again, please note that for the Postscript background the
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<code class="code">Backend::Stroke()</code> method normally returns the postscript file
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as a string if everything went well.</p>
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</div>
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<div class="sect2" title="Writing barcodes to a file"><div class="titlepage"><div><div><h3 class="title"><a name="id2597044"></a>Writing barcodes to a file</h3></div></div></div>
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<p>This is done by adding a second argument, the file name, to the
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<code class="code">Backend::Stroke()</code> method. This works for all backends. The file
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name should be an absolute path name. Since it is the PHP process that writes
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the file the permissions must allow the PHP process to write to the directory if
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PHP is called from a browser. If the command line version of PHP is used this
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does of course not apply.</p>
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</div>
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<div class="sect2" title="Hiding the human readable text"><div class="titlepage"><div><div><h3 class="title"><a name="id2597234"></a>Hiding the human readable text</h3></div></div></div>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">Backend::HideText($aHide=true)</code></p>
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</li></ul></div><p>
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</p>
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<p>The human readable text is the string that can optionally be displayed at the
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bottom of the bar. By default this is enabled. </p>
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</div>
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<div class="sect2" title="Adjusting the module width"><div class="titlepage"><div><div><h3 class="title"><a name="id2597265"></a>Adjusting the module width</h3></div></div></div>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">Backend::SetModuleWidth($aWidth)</code></p>
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</li></ul></div><p>
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</p>
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<p>There are however some subtle facts regarding the module width and backend
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that needs to be explained. </p>
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<p>
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</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
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<p>For image type backends the module width specifies the number of
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pixels used for a module.</p>
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</li><li class="listitem">
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<p>For Postscript (and Encapsulated PS) backends the module width
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specifies the width in points (i.e. 1/72 inch). </p>
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</li></ol></div><p>
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</p>
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<p>This also means that for image type backends only integer values makes
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sense.</p>
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<p>
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</p><div class="caution" title="Caution" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Caution</h3>
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<p>Depending on the quality of the printer (and paper) very small module
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width might not be readable with all bar code readers. For images it is
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therefore recommended to use "2" pixels as the minimum module width and
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for postscript output the minimum recommended width is "0.8" pt.</p>
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</div><p>
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</p>
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<p>The following code shows how to both change the module width to 2 pixels and
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hide the human readable text </p>
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<p>
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</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
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</pre></td><td class="hl-main" valign="top"><pre><span class="hl-inlinetags"><?php</span><span class="hl-code">
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</span><span class="hl-var">$symbology</span><span class="hl-code"> = </span><span class="hl-identifier">BarcodeFactory</span><span class="hl-code">::</span><span class="hl-identifier">Create</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">ENCODING_CODE39</span><span class="hl-code"> </span><span class="hl-brackets">)</span><span class="hl-code">;
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</span><span class="hl-var">$barcode</span><span class="hl-code"> = </span><span class="hl-identifier">BackendFactory</span><span class="hl-code"> ::</span><span class="hl-identifier">Create</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">IMAGE</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-var">$symbology</span><span class="hl-brackets">)</span><span class="hl-code">;
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</span><span class="hl-var">$barcode</span><span class="hl-code"> -></span><span class="hl-identifier">SetModuleWidth</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-number">2</span><span class="hl-brackets">)</span><span class="hl-code">;
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</span><span class="hl-var">$barcode</span><span class="hl-code"> -></span><span class="hl-identifier">HideText</span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-code">;
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</span><span class="hl-var">$barcode</span><span class="hl-code"> -></span><span class="hl-identifier">Stroke</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">ABC123</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">;
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</span><span class="hl-inlinetags">?></span></pre></td></tr></table></div><p>
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</p>
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<p>which would give the result shown in <a class="xref" href="ch24s08.html#fig.barcode-c39-ex2" title='Figure 24.7. Encoding "ABC123" with CODE 39, hiding the text.'>Figure 24.7. Encoding "ABC123" with CODE 39, hiding the text.</a>
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below</p>
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<p>
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</p><div class="figure"><a name="fig.barcode-c39-ex2"></a><p class="title"><b>Figure 24.7. Encoding "ABC123" with CODE 39, hiding the text.</b></p><div class="figure-contents">
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<div class="mediaobject"><img src="images/barcode_c39_abc123_ex2.png" alt='Encoding "ABC123" with CODE 39, hiding the text.'></div>
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</div></div><p><br class="figure-break">
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</p>
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</div>
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<div class="sect2" title="Setting vertical or horizontal layout"><div class="titlepage"><div><div><h3 class="title"><a name="id2597395"></a> Setting vertical or horizontal layout</h3></div></div></div>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">Backend::SetVertical($aVertical=true)</code></p>
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</li></ul></div><p>
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</p>
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<p>Will rotate the barcode 90 degrees to create a vertical view of the
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barcode.</p>
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</div>
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<div class="sect2" title="Adjusting height of bar code"><div class="titlepage"><div><div><h3 class="title"><a name="id2597418"></a>Adjusting height of bar code</h3></div></div></div>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p>
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<code class="code">Backend::SetHeight($aHeight)</code></p>
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</li></ul></div><p>
|
|||
|
|
</p>
|
|||
|
|
<p>The height of the bar codes is specified with the
|
|||
|
|
<code class="code">Backend::SetHeight()</code> method. For images the height is
|
|||
|
|
interpreted as pixels and for postscript files it is interpreted as points (1 pt
|
|||
|
|
= 1/72 inch)</p>
|
|||
|
|
</div>
|
|||
|
|
<div class="sect2" title="Scaling of bar codes"><div class="titlepage"><div><div><h3 class="title"><a name="id2597385"></a>Scaling of bar codes</h3></div></div></div>
|
|||
|
|
|
|||
|
|
<p>
|
|||
|
|
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
|
|||
|
|
<p><code class="code">Backend::SetScale($aScaleFactor)</code></p>
|
|||
|
|
</li></ul></div><p>
|
|||
|
|
</p>
|
|||
|
|
<p>The scale factor is real number and specifies a scale factor for the overall
|
|||
|
|
barcode image. </p>
|
|||
|
|
</div>
|
|||
|
|
<div class="sect2" title="Add frame around bar code"><div class="titlepage"><div><div><h3 class="title"><a name="id2597465"></a>Add frame around bar code</h3></div></div></div>
|
|||
|
|
|
|||
|
|
<p>
|
|||
|
|
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
|
|||
|
|
<p><code class="code">Backend::ShowFrame($aFlag=true)</code></p>
|
|||
|
|
</li></ul></div><p>
|
|||
|
|
</p>
|
|||
|
|
<p>This method will enable a frame around the edges of the barcode image</p>
|
|||
|
|
</div>
|
|||
|
|
<div class="sect2" title="Examples of adjusting the output"><div class="titlepage"><div><div><h3 class="title"><a name="id2597509"></a>Examples of adjusting the output</h3></div></div></div>
|
|||
|
|
|
|||
|
|
<p>The following example outputs a postscript file representing the bar code with
|
|||
|
|
a module width of 1.2 pt, using a vertical layout and scaling the image 2 times.
|
|||
|
|
For this example we are using CODE 39 with a checksum (which is automatically
|
|||
|
|
generated) </p>
|
|||
|
|
<p>
|
|||
|
|
</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
|
|||
|
|
2
|
|||
|
|
3
|
|||
|
|
4
|
|||
|
|
5
|
|||
|
|
6
|
|||
|
|
7
|
|||
|
|
8
|
|||
|
|
</pre></td><td class="hl-main" valign="top"><pre><span class="hl-inlinetags"><?php</span><span class="hl-code">
|
|||
|
|
</span><span class="hl-var">$symbology</span><span class="hl-code"> = </span><span class="hl-identifier">BarcodeFactory</span><span class="hl-code">::</span><span class="hl-identifier">Create</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">ENCODING_CODE128</span><span class="hl-code"> </span><span class="hl-brackets">)</span><span class="hl-code">;
|
|||
|
|
</span><span class="hl-var">$barcode</span><span class="hl-code"> = </span><span class="hl-identifier">BackendFactory</span><span class="hl-code"> ::</span><span class="hl-identifier">Create</span><span class="hl-brackets">(</span><span class="hl-identifier">BACKEND_PS</span><span class="hl-code">, </span><span class="hl-var">$symbology</span><span class="hl-brackets">)</span><span class="hl-code">;
|
|||
|
|
</span><span class="hl-var">$barcode</span><span class="hl-code">-></span><span class="hl-identifier">SetVertical</span><span class="hl-brackets">(</span><span class="hl-reserved">true</span><span class="hl-brackets">)</span><span class="hl-code">;
|
|||
|
|
</span><span class="hl-var">$barcode</span><span class="hl-code">-></span><span class="hl-identifier">Scale</span><span class="hl-brackets">(</span><span class="hl-number">2</span><span class="hl-brackets">)</span><span class="hl-code">;
|
|||
|
|
</span><span class="hl-var">$barcode</span><span class="hl-code">-></span><span class="hl-identifier">SetModuleWidth</span><span class="hl-brackets">(</span><span class="hl-number">1</span><span class="hl-number">.2</span><span class="hl-brackets">)</span><span class="hl-code">;
|
|||
|
|
</span><span class="hl-var">$barcode</span><span class="hl-code"> -></span><span class="hl-identifier">Stroke</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">ABC123</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code"> ) </span><span class="hl-brackets">{</span><span class="hl-code">
|
|||
|
|
</span><span class="hl-inlinetags">?></span></pre></td></tr></table></div><p>
|
|||
|
|
</p>
|
|||
|
|
</div>
|
|||
|
|
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