Package org.mapsforge.map.layer.labels

Class ThreadedLabelLayer

java.lang.Object

org.mapsforge.map.layer.Layer

org.mapsforge.map.layer.labels.LabelLayer

org.mapsforge.map.layer.labels.ThreadedLabelLayer

public class ThreadedLabelLayer
extends LabelLayer

This ThreadedLabelLayer employs a single thread to request new data from the LabelStore. In case the previously displayed data is still valid for at least some part of the map, the old data is drawn first. When the thread delivers the data for the new area, the layer is redrawn. The layer keeps track of the requested area and will not request the same area multiple times. Also the queue length is limited to one, so outdated requests will not be started.

Field Summary

Fields inherited from class org.mapsforge.map.layer.labels.LabelLayer

elementsToDraw, labelStore, lastLabelStoreVersion, lowerRight, matrix, upperLeft

Fields inherited from class org.mapsforge.map.layer.Layer

displayModel

Constructor Summary

Constructors

Constructor	Description
ThreadedLabelLayer(org.mapsforge.core.graphics.GraphicFactory graphicFactory, LabelStore labelStore)

Method Summary

Modifier and Type	Method	Description
void	draw(org.mapsforge.core.model.BoundingBox boundingBox, byte zoomLevel, org.mapsforge.core.graphics.Canvas canvas, org.mapsforge.core.model.Point topLeftPoint)	Draws this Layer on the given canvas.
protected void	getData(org.mapsforge.core.model.Tile upperLeft, org.mapsforge.core.model.Tile lowerRight)
void	onDestroy()

Methods inherited from class org.mapsforge.map.layer.labels.LabelLayer

draw

Methods inherited from class org.mapsforge.map.layer.Layer

getDisplayModel, getPosition, isVisible, onAdd, onLongPress, onRemove, onScroll, onTap, requestRedraw, setDisplayModel, setVisible, setVisible

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ThreadedLabelLayer

public ThreadedLabelLayer(org.mapsforge.core.graphics.GraphicFactory graphicFactory,
                          LabelStore labelStore)

Method Detail

draw

public void draw(org.mapsforge.core.model.BoundingBox boundingBox,
                 byte zoomLevel,
                 org.mapsforge.core.graphics.Canvas canvas,
                 org.mapsforge.core.model.Point topLeftPoint)

Description copied from class: Layer

Draws this Layer on the given canvas.

Overrides:

draw in class LabelLayer

Parameters:

boundingBox - the geographical area which should be drawn.

zoomLevel - the zoom level at which this Layer should draw itself.

canvas - the canvas on which this Layer should draw itself.

topLeftPoint - the top-left pixel position of the canvas relative to the top-left map position.

getData

protected void getData(org.mapsforge.core.model.Tile upperLeft,
                       org.mapsforge.core.model.Tile lowerRight)

onDestroy

public void onDestroy()

Overrides:

onDestroy in class Layer