Example script
| Chapter 26. Datamatrix (2D-Barcode) |

## Example script

### Example 1 - Setting the shape

The following example shows how to

- Set the shape to 64x64

- Use ASCII encoding

- Adjust the quiet zone

Example 26.4. Datamatrix example, setting quiet zone and ASCII encoding (`datamatrix_ex4.php`)

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    <?php
    require_once('jpgraph/datamatrix/datamatrix.inc.php');

    $data = 'This is a 64x64 datamatrix symbol';

    // Create and set parameters for the encoder
    $encoder = DatamatrixFactory::Create(DMAT_64x64);
    $encoder->SetEncoding(ENCODING_TEXT);

    // Create the image backend (default)
    $backend = DatamatrixBackendFactory::Create($encoder);
    $backend->SetModuleWidth(3);

    // Adjust the Quiet zone
    $backend->SetQuietZone(10);

    // Create the barcode from the given data string and write to output file
    try {
        $backend->Stroke($data);
    } catch (Exception $e) {
        $errstr = $e->GetMessage();
        echo "Datamatrix error message: $errstr\n";
    }

    ?>

Figure 26.10. Datamatrix example, setting quiet zone and ASCII encoding `(`datamatrix_ex4.php`)`

### Example 2 - Writing to a file

The following example shows how to generate a barcode and write it to a file.

Example 26.5. Datamatrix example, writing to a file (`datamatrix_ex6.php`)

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    <?php
    require_once('jpgraph/datamatrix/datamatrix.inc.php');

    $data = 'This is a datamatrix symbol';

    $outputfile = 'dm_ex6.png';

    // Create and set parameters for the encoder
    $encoder = DatamatrixFactory::Create();
    $encoder->SetEncoding(ENCODING_TEXT);

    // Create the image backend (default)
    $backend = DatamatrixBackendFactory::Create($encoder);
    $backend->SetModuleWidth(5);
    $backend->SetQuietZone(10);

    // Set other than default colors (one, zero, background)
    $backend->SetColor('navy','white');

    // Create the barcode from the given data string and write to output file
    $dir = dirname(__FILE__);
    $file = '<span style="font-weight:bold;">"'.$dir.'/'.$outputfile.'"</span>';
    try {
        $backend->Stroke($data,$outputfile);
        echo 'Barcode sucessfully written to file: '.$file;
    } catch (Exception $e) {
        $errstr = $e->GetMessage();
        $errcode = $e->GetCode();
        echo "Failed writing file: ".$file.'<br>';
        echo "Datamatrix error ($errcode). Message: $errstr\n";
    }

    ?>

### Example 3 - Creating postscript output

The following example shows hot to generate a postscript output.

When

Example 26.6. Datamatrix example, creating postscript output (`datamatrix_ex7.php`)

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    <?php
    require_once('jpgraph/datamatrix/datamatrix.inc.php');

    $data = 'A Datamatrix barcode';

    // Create and set parameters for the encoder
    $encoder = DatamatrixFactory::Create();
    $encoder->SetEncoding(ENCODING_BASE256);

    // Create the image backend (default)
    $backend = DatamatrixBackendFactory::Create($encoder, BACKEND_ASCII);
    $backend->SetModuleWidth(3);

    try {
        $ps_txt = $backend->Stroke($data);
        echo '<pre>'.$ps_txt.'</pre>';
    } catch (Exception $e) {
        $errstr = $e->GetMessage();
        echo "Datamatrix error message: $errstr\n";
    }

    ?>

The resulting output is shown in Figure 26.11. Datamatrix postscript output below

Figure 26.11. Datamatrix postscript output

### Example 4 - Changing background color

The following example shows how to modify the colors in the barcode.

Example 26.7. Datamatrix example, changing colors (`datamatrix_ex5.php`)

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    <?php
    require_once('jpgraph/datamatrix/datamatrix.inc.php');

    $data = 'This is a 20x20 symbol';

    // Create and set parameters for the encoder
    $encoder = DatamatrixFactory::Create(DMAT_20x20);
    $encoder->SetEncoding(ENCODING_TEXT);

    // Create the image backend (default)
    $backend = DatamatrixBackendFactory::Create($encoder);

    // By default the module width is 2 pixel so we increase it a bit
    $backend->SetModuleWidth(4);

    // Set Quiet zone
    $backend->SetQuietZone(10);

    // Set other than default colors (one, zero, quiet zone/background)
    $backend->SetColor('navy','white','lightgray');

    // Create the barcode from the given data string and write to output file
    try {
        $backend->Stroke($data);
    } catch (Exception $e) {
        $errstr = $e->GetMessage();
        echo "Datamatrix error message: $errstr\n";
    }

    ?>

Figure 26.12. Datamatrix example, changing colors `(`datamatrix_ex5.php`)`

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