Some predefined renderers produce IlvGraphic objects, which are instances of
the IlvMapGraphic class. These renderers include
IlvMapAreaRenderer, IlvMapPointRenderer, IlvMapCurveRenderer and IlvMapTextRenderer. The graphic objects
produced by these renders can be styled by means of an IlvMapStyle object. The predefined data
sources provided by JViews
Maps use these renderers and make it possible to change the style
of a layer without reloading the entire map.
The following code creates an IlvShapeDataSource and sets an
IlvMapAreaRenderer
to render the feature read by the data source. The fill color is
set to red. A button is created whose action sets the color of the
map to blue simply by changing the
Paint
attribute of the layer.
IlvShapeDataSource ds = new IlvShapeDataSource(shapeFile);
ds.setManager(view.getManager());
IlvMapAreaRenderer renderer = new IlvMapAreaRenderer(false, false);
IlvGraphicPathStyle style = new IlvGraphicPathStyle();
ds.getInsertionLayer().setStyle(style);
style.setFilling(true);
style.setPaint(Color.red);
ds.setFeatureRenderer(renderer);
JButton b = new JButton();
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
IlvGraphicPathStyle style = ( (IlvGraphicPathStyle)ds.getInsertionLayer().getStyle();
style.setPaint(Color.blue);
view.repaint();
}
});