Halo (Geotools modules 31-SNAPSHOT API)

All Known Implementing Classes:

HaloImpl
```
public interface Halo
```
A Halo is a type of Fill that is applied to the backgrounds of font glyphs. The use of halos greatly improves the readability of text labels.

Since:

GeoAPI 2.2

Author:

Open Geospatial Consortium, Johann Sorel (Geomatys), Chris Dillard (SYS Technologies)

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`accept(StyleVisitor visitor)`
`Object`	`accept(TraversingStyleVisitor visitor, Object extraData)`	calls the visit method of a StyleVisitor
`Fill`	`getFill()`	Returns the object that indicates how the halo area around the text should be filled.
`Expression`	`getRadius()`	Returns the expression that will be evaluated to get the pixel radius of the halo around the text.
`void`	`setFill(Fill fill)`	The fill (color) of the halo
`void`	`setRadius(Expression radius)`	Expression that represents the the distance the halo extends from the text

- Method Detail
  - setRadius
```
void setRadius(Expression radius)
```
    Expression that represents the the distance the halo extends from the text
  - getFill
```
Fill getFill()
```
    Returns the object that indicates how the halo area around the text should be filled.
    The default halo fill is solid white (Color “#FFFFFF”). The glyph’s fill is plotted on top of the halo. The default font fill is solid black (Color “#000000”).
    
    Returns:
    
    Fill or null
  - getRadius
```
Expression getRadius()
```
    Returns the expression that will be evaluated to get the pixel radius of the halo around the text.
    The Radius element gives the absolute size of a halo radius in pixels encoded as a floating-point number. The radius is taken from the outside edge of a font glyph to extend the area of coverage of the glyph (and the inside edge of “holes” in the glyphs). The halo of a text label is considered to be a single shape. The default radius is one pixel. Negative values are not allowed.
    
    Returns:
    
    Expression or null
  - accept
```
Object accept(TraversingStyleVisitor visitor,
              Object extraData)
```
    calls the visit method of a StyleVisitor
    
    Parameters:
    
    visitor - the style visitor
  - setFill
```
void setFill(Fill fill)
```
    The fill (color) of the halo
  - accept
```
void accept(StyleVisitor visitor)
```