The Altitude Visibility Chart bean

Programmer's documentation > Programming with JViews Maps for Defense > Using the GUI beans > The Altitude Visibility Chart bean

Describes the Altitude Visibility Chart bean and how to use it.

Overview

Describes the Altitude Visibility Chart bean.

Integrating the Altitude Visibility Chart bean into an Application

Explains how to integrate the Altitude Visibility chart bean into your application.

Overview

The Altitude Visibility Chart bean is represented by the IlvAltitudeVisibilityChart class. This bean is used by the Line of Sight interactor. The Line of Sight interactor is a graphic object displayed in one of the layers of a view and represented by the IlvLineOfVisibility class, see Line of Sight interactor.

To create the Altitude Visibility Chart, you can either use the Line of Sight interactor, see Creating and Installing the Area of Sight interactor, or, for more precise control, write the lines of code given in this section.

The following figure shows an example of an Altitude Visibility Chart.

Altitude Visibility Chart

The source code for the Map Builder demonstration, which contains all of the code described in this section, can be found at <installdir> /jviews-maps/samples/mapbuilder/index.html.

Integrating the Altitude Visibility Chart bean into an Application

To integrate the Altitude Visibility Chart bean into your application, you must first create the Line of Sight object in your program:

Setting the Line of Sight interactor parameters

Set the points defining the Line of Sight polyline for which the altitudes will be displayed:

IlvPoint[] points = new IlvPoint[] {

// Define your points as view coordinates here.

};

// Transform the points into manager coordinates.

// You can also define your points directly in

// manager coordinates.

for(int i = 0; i < points.length; i++)

view.getTransformer().inverse(points[i]);

// Create the line of visibility

IlvLineOfVisibility lineofvisibility = new

IlvLineOfVisibility(manager,100,1000,points[0],points[2]);

Creating a data source and map layer

To manage the Line of Sight in standard JViews Maps beans, you also need to create a data source and Map Layer, and link them with the manager properties.

IlvMapLayerTreeModel ltm =

IlvMapLayerTreeProperty.GetMapLayerTreeModel(manager);

IlvMapDataSourceModel dsm =

IlvMapDataSourceProperty.GetMapDataSourceModel(manager);

IlvGraphicLayerDataSource dataSource=new IlvGraphicLayerDataSource();

dsm.insert(dataSource);

IlvMapLayer mapLayer = dataSource.getInsertionLayer();

mapLayer.setAllowingMoveObjects(true);

mapLayer.setStyle(new IlvLineOfVisibilityStyle());

ltm.addChild(null, mapLayer);

Adding the Line of Sight to the data source

Add the Line of Sight object to the data source so that it can be managed by the data source, for example, to change the representation when the coordinate system changes.

dataSource.add(lineofvisibility);

Creating an Altitude Visibility chart

Create the Altitude Visibility chart from a Line of Sight:

IlvAltitudeVisibilityChart avc = new

IlvAltitudeVisibilityChart(manager,lineofvisibility);

Recomputing the Altitude Visibility chart

Recompute the chart when it has been resized:

avc.addComponentListener(new ComponentAdapter() {

public void componentResized(ComponentEvent e) {

avc.updateChart();

}

});