private void appendLine(Document doc, Element parent, BxLine line, Object... hints) {
Element node = doc.createElement("Line");
appendPropertyIfNotNull(doc, node, "LineID", line.getId());
appendBounds(doc, node, "LineCorners", line.getBounds(), hints);
appendPropertyIfNotNull(doc, node, "LineNext", line.getNextId());
appendProperty(doc, node, "LineNumChars", "");
for (BxWord word : line.getWords()) {
appendWord(doc, node, word, hints);
}
parent.appendChild(node);
}
@Override
public double calculateFeatureValue(BxZone zone, BxPage page) {
double charSpace = 0.0;
for (BxLine line : zone.getLines()) {
for (BxWord word : line.getWords()) {
for (BxChunk chunk : word.getChunks()) {
charSpace += chunk.getArea();
}
}
}
double ret = zone.getArea() - charSpace;
if (ret < 0) {
return 0.0;
} else {
return ret;
}
}