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# Auxiliares

Neste apartado falamos de clases auxiliares que van a facilitar a nosa implementación das interfaces:

## Dimension

`Dimension` en Swing é unha **clase que representa un tamaño (ancho e alto) en píxeles**.

* Úsase principalmente cos **componentes gráficos** para indicar:
  * **`setPreferredSize(Dimension d)`** → tamaño preferido
  * **`setMinimumSize(Dimension d)`** → tamaño mínimo
  * **`setMaximumSize(Dimension d)`** → tamaño máximo

{% hint style="info" %}
**Documentación oficial:** <https://docs.oracle.com/javase/8/docs/api/java/awt/Dimension.html>
{% endhint %}

```java
JPanel panel = new JPanel();
panel.setPreferredSize(new Dimension(300, 100));
```

## Border

`Border` é unha **interface de Swing** que define un **borde ou marco decorativo** arredor dun compoñente (`JPanel`, `JLabel`, etc.).

* Pode ser **visible** (liñas, relevo, títulos) ou **invisible** (soamente padding).
* Exemplos de bordes: `LineBorder`, `BevelBorder`, `TitledBorder`, etc.

{% hint style="info" %}
**Documentación oficial:** <https://docs.oracle.com/javase/8/docs/api/javax/swing/border/Border.html>
{% endhint %}

## BorderFactory

`BorderFactory` é unha **clase de utilidade** que crea instancias de `Border` de forma sinxela.

* Nunca se instancian bordes directamente; sempre se usan os métodos estáticos de `BorderFactory`.
* Permite crear todo tipo de bordes: liñas, relevo, compostos, con títulos, etc.

{% hint style="info" %}
**Documentación oficial:** <https://docs.oracle.com/javase/8/docs/api/javax/swing/BorderFactory.html>
{% endhint %}

```java
JPanel panel = new JPanel();
Border marginBorder = BorderFactory.createEmptyBorder(10, 10, 10, 10);
Border lineBorder = BorderFactory.createLineBorder(Color.DARK_GRAY, 4);
panel.setBorder(BorderFactory.createCompoundBorder(lineBorder, marginBorder));
```

## ImageIO

É unha **clase utilitaria de Java** que permite **ler e escribir imaxes** en diferentes formatos (`PNG`, `JPG`, `GIF`, etc.).

No noso caso imos a empregala unicamente para lectura mediante un metodo read que recibe un obxecto File

{% hint style="info" %}
Documentación oficial: <https://docs.oracle.com/javase/8/docs/api/javax/imageio/ImageIO.html>
{% endhint %}

## Image

Clase que representa unha imaxe.

{% hint style="info" %}
Doucmenatción oficial: <https://docs.oracle.com/javase/8/docs/api/java/awt/Image.html>
{% endhint %}

```java
Image imagenLeida = ImageIO.read(new File("C://Usuarios//...//Imagen.png"));
```


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