LabeledPath (NASA World Wind)

java.lang.Object
- gov.nasa.worldwindx.examples.util.LabeledPath

All Implemented Interfaces:

Renderable
```
public class LabeledPath
extends Object
implements Renderable
```
LabeledPath draws a Annotation on a specified path. The path itself is not drawn. Instead, the annotation is drawn at the location that maximizes the annotation's visible area in the viewport. The annotation is not drawn if the location list is null, or if no location in the list is visible.
The caller must specify the screen annotation used to draw the path's label by calling setAnnotation(gov.nasa.worldwind.render.ScreenAnnotation). The path sets the specified annotation's screen point to control the label's location, but otherwise does not modify the annotation.

Field Summary

Fields
Modifier and Type	Field and Description
`protected int`	`altitudeMode` The altitude mode that defines how to interpret the altitude of locations that have an altitude component.
`protected ScreenAnnotation`	`annotation` The screen annotation to use as a label.
`protected long`	`frameNumber` The frame number used to place the label.
`protected int`	`labelLocationIndex` The index of the label's location in `locations`, or -1 if the path has no label location.
`protected Iterable<? extends LatLon>`	`locations` The labeled path's locations as specified by the application.

Constructor Summary

Constructors
Constructor and Description
`LabeledPath()` Creates a labeled path with no locations and no label annotation.
`LabeledPath(Iterable<? extends LatLon> locations)` Creates a labeled path with specified locations.
`LabeledPath(Iterable<? extends LatLon> locations, ScreenAnnotation annotation)` Creates a labeled path with the specified label annotation and locations.
`LabeledPath(ScreenAnnotation annotation)` Creates a labeled path with the specified label annotation and no locations.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`protected Vec4`	`computePoint(DrawContext dc, LatLon location)` Computes a model-coordinate point from a LatLon or Position, applying the path's altitude mode.
`protected void`	`determineLabelLocation(DrawContext dc)` Determines the screen location to place the label at, and stores the the index of the corresponding location in `labelLocationIndex`.
`protected void`	`drawLabel(DrawContext dc)` Causes the labeled path to draw its label at the path's current label location.
`int`	`getAltitudeMode()` Returns the labeled path's altitude mode.
`ScreenAnnotation`	`getAnnotation()` Returns the `ScreenAnnotation` used to draw the label, or `null` if the path doesn't draw a label.
`protected Vec4`	`getLabelPoint(DrawContext dc)` Returns the label's model-coordinate point form the path's location iterable, applying the path's altitude mode.
`protected double`	`getLabelVisibleArea(DrawContext dc)` Returns the approximate number of square pixels that are visible at the label's current location, or 0 if the label is not visible.
`Iterable<? extends LatLon>`	`getLocations()` Returns the labeled path's locations.
`protected boolean`	`isLabelCompletelyVisible(DrawContext dc)` Returns `true` if the label is completely visible at its current location, and `false` otherwise.
`void`	`render(DrawContext dc)` Causes the labeled path to draw its label at one of the path locations.
`protected void`	`reset()` Resets the labeled path's cached location information.
`void`	`setAltitudeMode(int altitudeMode)` Specifies the labeled path's altitude mode, one of `WorldWind.ABSOLUTE`, `WorldWind.RELATIVE_TO_GROUND` or `WorldWind.CLAMP_TO_GROUND`.
`void`	`setAnnotation(ScreenAnnotation annotation)` Specifies the `ScreenAnnotation` to use for drawing the label.
`protected void`	`setLabelLocation(DrawContext dc, Vec4 screenPoint)` Places the label at the specified screen point.
`void`	`setLocations(Iterable<? extends LatLon> locations)` Specifies the labeled path's locations, which replace the path's current locations, if any.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - altitudeMode
```
protected int altitudeMode
```
    The altitude mode that defines how to interpret the altitude of locations that have an altitude component. Defaults to WorldWind.ABSOLUTE.
  - annotation
```
protected ScreenAnnotation annotation
```
    The screen annotation to use as a label. null if no annotation has been specified.
  - frameNumber
```
protected long frameNumber
```
    The frame number used to place the label.
  - labelLocationIndex
```
protected int labelLocationIndex
```
    The index of the label's location in locations, or -1 if the path has no label location.
  - locations
```
protected Iterable<? extends LatLon> locations
```
    The labeled path's locations as specified by the application. null if no locations have been specified.
- Constructor Detail
  - LabeledPath
```
public LabeledPath()
```
    Creates a labeled path with no locations and no label annotation.
  - LabeledPath
```
public LabeledPath(Iterable<? extends LatLon> locations)
```
    Creates a labeled path with specified locations.
    
    Parameters:
    
    locations - the labeled path's locations.
    
    Throws:
    
    IllegalArgumentException - if locations is null.
  - LabeledPath
```
public LabeledPath(Iterable<? extends LatLon> locations,
                   ScreenAnnotation annotation)
```
    Creates a labeled path with the specified label annotation and locations.
    
    Parameters:
    
    locations - the labeled path's locations.
    
    annotation - the screen annotation to use for drawing the label, or null if no label should be drawn.
    
    Throws:
    
    IllegalArgumentException - if locations is null.
  - LabeledPath
```
public LabeledPath(ScreenAnnotation annotation)
```
    Creates a labeled path with the specified label annotation and no locations.
    
    Parameters:
    
    annotation - the screen annotation to use for drawing the label, or null if no label should be drawn.
- Method Detail
  - computePoint
```
protected Vec4 computePoint(DrawContext dc,
                            LatLon location)
```
    Computes a model-coordinate point from a LatLon or Position, applying the path's altitude mode. If the location is a LatLon it's assumed to have an elevation of 0.
    
    Parameters:
    
    dc - the current draw context.
    
    location - the location to compute a point for.
    
    Returns:
    
    the model-coordinate point corresponding to the position and the path's path type.
  - determineLabelLocation
```
protected void determineLabelLocation(DrawContext dc)
```
    Determines the screen location to place the label at, and stores the the index of the corresponding location in labelLocationIndex. This assigns labelLocationIndex to null if the label cannot be placed at any screen location corresponding to the path.
    
    Parameters:
    
    dc - the current draw context.
  - drawLabel
```
protected void drawLabel(DrawContext dc)
```
    Causes the labeled path to draw its label at the path's current label location.
    
    Parameters:
    
    dc - the current draw context.
  - getAltitudeMode
```
public int getAltitudeMode()
```
    Returns the labeled path's altitude mode.
    
    Returns:
    
    the labeled path's altitude mode.
    
    See Also:
    
    setAltitudeMode(int)
  - getAnnotation
```
public ScreenAnnotation getAnnotation()
```
    Returns the ScreenAnnotation used to draw the label, or null if the path doesn't draw a label.
    
    Returns:
    
    the screen annotation used for drawing the label, or null if no label is drawn.
  - getLabelPoint
```
protected Vec4 getLabelPoint(DrawContext dc)
```
    Returns the label's model-coordinate point form the path's location iterable, applying the path's altitude mode. If the location is a LatLon it's assumed to have an elevation of 0. This returns null if the path has no label location, or if the path's locations have changed and no longer contain a value at the cached location index.
    
    Parameters:
    
    dc - the current draw context.
    
    Returns:
    
    a model-coordinate point corresponding to the label's position and the path's path type.
  - getLabelVisibleArea
```
protected double getLabelVisibleArea(DrawContext dc)
```
    Returns the approximate number of square pixels that are visible at the label's current location, or 0 if the label is not visible.
    
    Parameters:
    
    dc - the current draw context.
    
    Returns:
    
    the number of square pixels visible.
  - getLocations
```
public Iterable<? extends LatLon> getLocations()
```
    Returns the labeled path's locations.
    
    Returns:
    
    the labeled path's locations. Will be null if no locations have been specified.
  - isLabelCompletelyVisible
```
protected boolean isLabelCompletelyVisible(DrawContext dc)
```
    Returns true if the label is completely visible at its current location, and false otherwise.
    
    Parameters:
    
    dc - the current draw context.
    
    Returns:
    
    true if the label is completely visible at its current location, and false otherwise.
  - render
```
public void render(DrawContext dc)
```
    Causes the labeled path to draw its label at one of the path locations.
    
    Specified by:
    
    render in interface Renderable
    
    Parameters:
    
    dc - the DrawContext to be used.
    
    Throws:
    
    IllegalArgumentException - if dc is null.
    
    See Also:
    
    DrawContext
  - reset
```
protected void reset()
```
    Resets the labeled path's cached location information.
  - setAltitudeMode
```
public void setAltitudeMode(int altitudeMode)
```
    Specifies the labeled path's altitude mode, one of WorldWind.ABSOLUTE, WorldWind.RELATIVE_TO_GROUND or WorldWind.CLAMP_TO_GROUND.
    Note: If the altitude mode is unrecognized, WorldWind.ABSOLUTE is used.
    
    Parameters:
    
    altitudeMode - the altitude mode. The default value is WorldWind.ABSOLUTE.
  - setAnnotation
```
public void setAnnotation(ScreenAnnotation annotation)
```
    Specifies the ScreenAnnotation to use for drawing the label. The specified screen annotation's screen point is controlled by the labled path. Otherwise the screen annotation's attributes are not modified.
    
    Parameters:
    
    annotation - the screen annotation to use for drawing the label, or null if no label should be drawn.
  - setLabelLocation
```
protected void setLabelLocation(DrawContext dc,
                                Vec4 screenPoint)
```
    Places the label at the specified screen point.
    
    Parameters:
    
    dc - the current draw context.
    
    screenPoint - the screen point to use.
  - setLocations
```
public void setLocations(Iterable<? extends LatLon> locations)
```
    Specifies the labeled path's locations, which replace the path's current locations, if any.
    
    Parameters:
    
    locations - the labeled path's locations.
    
    Throws:
    
    IllegalArgumentException - if locations is null.

Class LabeledPath

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

altitudeMode

annotation

frameNumber

labelLocationIndex

locations

Constructor Detail

LabeledPath

LabeledPath

LabeledPath

LabeledPath

Method Detail

computePoint

determineLabelLocation

drawLabel

getAltitudeMode

getAnnotation

getLabelPoint

getLabelVisibleArea

getLocations

isLabelCompletelyVisible

render

reset

setAltitudeMode

setAnnotation

setLabelLocation

setLocations