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File Name : objects.md

# Barcode Objects

Barcode objects allow you to generate barcodes independently of the rendering
support. After generation, you can retrieve the barcode as an array of drawing
instructions to provide to a renderer.

Objects have a large number of options, most of which are common across all
implementations. These options can be set in three ways:

- As an array or a [Traversable](http://php.net/traversable) object passed to the constructor.
- As an array passed to the `setOptions()` method.
- Via individual setters for each configuration type.

## Different ways to parameterize a barcode object

```php
use Zend\Barcode\Object;

$options = ['text' => 'ZEND-FRAMEWORK', 'barHeight' => 40];

// Case 1: constructor
$barcode = new Object\Code39($options);

// Case 2: setOptions()
$barcode = new Object\Code39();
$barcode->setOptions($options);

// Case 3: individual setters
$barcode = new Object\Code39();
$barcode->setText('ZEND-FRAMEWORK')
    ->setBarHeight(40);
```

## Common Options

In the following list, the values have no units; as such, we will use the
generic term "unit." For example, the default value of the "thin bar" is "1
unit". The real units depend on the rendering support (see the [renderers
documentation] (renderers.md) for more information).

Setters are each named by uppercasing the initial letter of the option and
prefixing the name with "set" (e.g. `barHeight` becomes `setBarHeight`). All
options have a corresponding getter prefixed with "get" (e.g. `getBarHeight`).

Available options are:

### Setting a common font for all objects

You can set a common font for all your objects by using the static method
`Zend\Barcode\Barcode::setBarcodeFont()`. This value can be always be overridden
for individual objects by using the `setFont()` method.

```php
use Zend\Barcode\Barcode;

// In your bootstrap:
Barcode::setBarcodeFont('my_font.ttf');

// Later in your code:
Barcode::render(
    'code39',
    'pdf',
    ['text' => 'ZEND-FRAMEWORK']
); // will use 'my_font.ttf'

// or:
Barcode::render(
    'code39',
    'image',
    [
        'text' => 'ZEND-FRAMEWORK',
        'font' => 3,
    ]
); // will use the 3rd GD internal font
```

## Common Additional Getters

Getter                                | Data Type | Description
:------------------------------------ | :-------: | :----------
`getType()`                           | string    | Return the name of the barcode class without the namespace (e.g. `Zend\Barcode\Object\Code39` returns simply "code39").
`getRawText()`                        | string    | Return the original text provided to the object.
`getTextToDisplay()`                  | string    | Return the text to display, including, if activated, the checksum value.
`getQuietZone()`                      | int       | Return the size of the space needed before and after the barcode without any drawing.
`getInstructions()`                   | array     | Return drawing instructions as an array..
`getHeight($recalculate = false)`     | int       | Return the height of the barcode calculated after possible rotation.
`getWidth($recalculate = false)`      | int       | Return the width of the barcode calculated after possible rotation.
`getOffsetTop($recalculate = false)`  | int       | Return the position of the top of the barcode calculated after possible rotation.
`getOffsetLeft($recalculate = false)` | int       | Return the position of the left of the barcode calculated after possible rotation.

## Description of shipped barcodes

Below is detailed information on all barcode types supported. Unless otherwise
noted, each barcode supports the general options outlined in the previous
section, and no others.

### Zend\\Barcode\\Object\\Error

![error](images/zend.barcode.objects.details.error.png)

This barcode is a special case. It is internally used to automatically render an
exception caught by the component.

### Zend\\Barcode\\Object\\Code128

![image](images/zend.barcode.objects.details.code128.png)

- **Name:** Code 128
- **Allowed characters:** the complete ASCII-character set
- **Checksum:** optional (modulo 103)
- **Length:** variable

### Zend\\Barcode\\Object\\Codabar

![image](images/zend.barcode.objects.details.codabar.png)

* **Name:** Codabar (or Code 2 of 7)
* **Allowed characters:** `0123456789-\$:/.+` with `ABCD` as start and stop characters
* **Checksum:** none
* **Length:** variable

### Zend\\Barcode\\Object\\Code25

![image](images/zend.barcode.objects.details.code25.png)

* **Name:** Code 25 (or Code 2 of 5 or Code 25 Industrial)
* **Allowed characters:** `0123456789`
* **Checksum:** optional (modulo 10)
* **Length:** variable

### Zend\\Barcode\\Object\\Code25interleaved

![image](images/zend.barcode.objects.details.int25.png)

This barcode extends `Zend\Barcode\Object\Code25` (Code 2 of 5), with the
following changes:

* **Name:** Code 2 of 5 Interleaved
* **Allowed characters:** `0123456789`
* **Checksum:** optional (modulo 10)
* **Length:** variable (always even number of characters)

It also defines the following additional option:

If the number of characters is not even, `Zend\Barcode\Object\Code25interleaved`
will automatically prepend the missing zero to the barcode text.

### Zend\\Barcode\\Object\\Ean2

![image](images/zend.barcode.objects.details.ean2.png)

This barcode extends `Zend\Barcode\Object\Ean5` (*EAN* 5), with the following
changes:

* **Name:** *EAN*-2
* **Allowed characters:** `0123456789`
* **Checksum:** Used internally, but not displayed
* **Length:** 2 characters

If the number of characters is lower than 2, `Zend\Barcode\Object\Ean2` will
automatically prepend the missing zero to the barcode text.

### Zend\\Barcode\\Object\\Ean5

![image](images/zend.barcode.objects.details.ean5.png)

This barcode extends `Zend\Barcode\Object\Ean13` (*EAN* 13), with the following
changes:

* **Name:** *EAN*-5
* **Allowed characters:** `0123456789`
* **Checksum:** Used internally, but not displayed
* **Length:** 5 characters

If the number of characters is lower than 5, `Zend\Barcode\Object\Ean5` will
automatically prepend zeroes to the barcode text until it reaches 5 characters.

### Zend\\Barcode\\Object\\Ean8

![image](images/zend.barcode.objects.details.ean8.png)

This barcode extends `Zend\Barcode\Object\Ean13` (*EAN* 13), with the following
changes:

* **Name:** *EAN*-8
* **Allowed characters:** `0123456789`
* **Checksum:** mandatory (modulo 10)
* **Length:** 8 characters (including checksum)

If the number of characters is lower than 8, `Zend\Barcode\Object\Ean8` will
automatically prepend zeros to the barcode text until it reaches 8 characters.

### Zend\\Barcode\\Object\\Ean13

![image](images/zend.barcode.objects.details.ean13.png)

* **Name:** *EAN*-13
* **Allowed characters:** `0123456789`
* **Checksum:** mandatory (modulo 10)
* **Length:** 13 characters (including checksum)

If the number of characters is lower than 13, `Zend\Barcode\Object\Ean13` will
automatically prepend zeros to the barcode text until it reaches 13 characters.

The option `withQuietZones` has no effect with this barcode.

### Zend\\Barcode\\Object\\Code39

![image](images/zend.barcode.introduction.example-1.png)

* **Name:** Code 39
* **Allowed characters:** `0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ -.\$/+%`
* **Checksum:** optional (modulo 43)
* **Length:** variable

`Zend\Barcode\Object\Code39` automatically adds the start and stop characters
(`*`) for you.

### Zend\\Barcode\\Object\\Identcode

![image](images/zend.barcode.objects.details.identcode.png)

This barcode extends `Zend\Barcode\Object\Code25interleaved` (Code 2 of 5
Interleaved), inheriting its capabilities and defining some of its own.

* **Name:** Identcode (Deutsche Post Identcode)
* **Allowed characters:** `0123456789`
* **Checksum:** mandatory (modulo 10 different from Code25)
* **Length:** 12 characters (including checksum)

If the number of characters is lower than 12, `Zend\Barcode\Object\Identcode`
will automatically prepend missing zeros to the barcode text.

### Zend\\Barcode\\Object\\Itf14

![image](images/zend.barcode.objects.details.itf14.png)

This barcode extends `Zend\Barcode\Object\Code25interleaved` (Code 2 of 5
Interleaved), inheriting its capabilities and defining some of its own.

* **Name:** *ITF*-14
* **Allowed characters:** `0123456789`
* **Checksum:** mandatory (modulo 10)
* **Length:** 14 characters (including checksum)

If the number of characters is lower than 14, `Zend\Barcode\Object\Itf14` will
automatically prepend missing zeros to the barcode text.

### Zend\\Barcode\\Object\\Leitcode

![image](images/zend.barcode.objects.details.leitcode.png)

This barcode extends `Zend\Barcode\Object\Identcode` (Deutsche Post Identcode),
inheriting its capabilities and defining some of its own:

* **Name:** Leitcode (Deutsche Post Leitcode)
* **Allowed characters:** `0123456789`
* **Checksum:** mandatory (modulo 10 different from Code25)
* **Length:** 14 characters (including checksum)

If the number of characters is lower than 14, `Zend\Barcode\Object\Leitcode`
will automatically prepend missing zeros to the barcode text.

### Zend\\Barcode\\Object\\Planet

![image](images/zend.barcode.objects.details.planet.png)

* **Name:** Planet (PostaL Alpha Numeric Encoding Technique)
* **Allowed characters:** `0123456789`
* **Checksum:** mandatory (modulo 10)
* **Length:** 12 or 14 characters (including checksum)

### Zend\\Barcode\\Object\\Postnet

![image](images/zend.barcode.objects.details.postnet.png)

* **Name:** Postnet (POSTal Numeric Encoding Technique)
* **Allowed characters:** `0123456789`
* **Checksum:** mandatory (modulo 10)
* **Length:** 6, 7, 10, or 12 characters (including checksum)

### Zend\\Barcode\\Object\\Royalmail

![image](images/zend.barcode.objects.details.royalmail.png)

* **Name:** Royal Mail or *RM4SCC* (Royal Mail 4-State Customer Code)
* **Allowed characters:** `0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ`
* **Checksum:** mandatory
* **Length:** variable

### Zend\\Barcode\\Object\\Upca

![image](images/zend.barcode.objects.details.upca.png)

This barcode extends `Zend\Barcode\Object\Ean13` (*EAN*-13), inheriting some of
its capabilities and defining some of its own.

* **Name:** *UPC*-A (Universal Product Code)
* **Allowed characters:** `0123456789`
* **Checksum:** mandatory (modulo 10)
* **Length:** 12 characters (including checksum)

If the number of characters is lower than 12, `Zend\Barcode\Object\Upca` will
automatically prepend missing zeros to the barcode text.

The option `withQuietZones` has no effect with this barcode.

### Zend\\Barcode\\Object\\Upce

![image](images/zend.barcode.objects.details.upce.png)

This barcode extends `Zend\Barcode\Object\Upca` (*UPC*-A), inheriting some of
its capabilities and defining some of its own. In particular, the first
character of the text to encode is the system (0 or 1).

* **Name:** *UPC*-E (Universal Product Code)
* **Allowed characters:** `0123456789`
* **Checksum:** mandatory (modulo 10)
* **Length:** 8 characters (including checksum)

If the number of characters is lower than 8, `Zend\Barcode\Object\Upce` will
automatically prepend missing zeros to the barcode text.

If the first character of the text to encode is not 0 or 1, `Zend\Barcode\Object\Upce` will
automatically replace it with 0.

The option `withQuietZones` has no effect with this barcode.

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