/**
* Adds a <tt>Theme</tt> that the <tt>Optimizer</tt> should consider.
*
* @param theme
*/
public void addTheme(Theme theme) {
if (!themes.contains(theme)) {
ArrayList themeElements = theme.getDisplayElements();
for (int i = 0; i < themeElements.size(); i++) {
Object o = themeElements.get(i);
if (o instanceof LabelDisplayElement) {
LabelDisplayElement element = (LabelDisplayElement) o;
TextSymbolizer symbolizer = (TextSymbolizer) element.getSymbolizer();
// only add element if "auto" is set
if (symbolizer.getLabelPlacement() != null) {
if (symbolizer.getLabelPlacement().getPointPlacement() != null
&& symbolizer.getLabelPlacement().getPointPlacement().isAuto()) {
displayElements.add(o);
// } else if (symbolizer.getLabelPlacement().getLinePlacement() != null) {
// displayElements.add (o);
}
}
}
}
themes.add(theme);
}
}
/**
* Finds optimized <tt>Label</tt> representations for the registered
* <tt>LabelDisplayElement</tt>s.
*
* <p>
*
* @param g
*/
public void optimize(Graphics2D g) throws Exception {
choices.clear();
double scale = mapView.getScale(g);
GeoTransform projection = mapView.getProjection();
// used to signal the LabelDisplayElement that it should
// not create Labels itself (in any case)
Label[] dummyLabels = new Label[0];
// collect LabelChoices for all LabelDisplayElements
for (int i = 0; i < displayElements.size(); i++) {
LabelDisplayElement element = (LabelDisplayElement) displayElements.get(i);
if (!element.doesScaleConstraintApply(scale)) continue;
element.setLabels(dummyLabels);
choices.addAll(LabelChoiceFactory.createLabelChoices(element, g, projection));
}
buildCollisionMatrix();
// do the magic
try {
anneal();
} catch (Exception e) {
e.printStackTrace();
}
// sets the optimized labels to the LabelDisplayElements, so
// they are considered when the DisplayElements are painted the next
// time
for (int i = 0; i < choices.size(); i++) {
LabelChoice choice = (LabelChoice) choices.get(i);
choice.getElement().addLabel(choice.getSelectedLabel());
}
}
