bool TerrainArea::parseArea()
{
if (!mEntity.hasAttr("area")) {
S_LOG_FAILURE("TerrainArea created for entity with no area attribute");
return false;
}
const Atlas::Message::Element areaElem(mEntity.valueOfAttr("area"));
if (!areaElem.isMap()) {
S_LOG_FAILURE("TerrainArea element ('area') must be of map type.");
return false;
}
const Atlas::Message::MapType& areaData(areaElem.asMap());
int layer = 0;
WFMath::Polygon<2> poly;
TerrainAreaParser parser;
if (parser.parseArea(areaData, poly, layer)) {
if (!mArea) {
mArea = new Mercator::Area(layer, false);
} else {
//A bit of an ugly hack here since the Mercator system doesn't support changing the layer. We need to swap the old area for a new one if the layer has changed.
if (mArea->getLayer() != layer) {
mOldArea = mArea;
mArea = new Mercator::Area(layer, false);
}
}
// transform polygon into terrain coords
WFMath::Vector<3> xVec = WFMath::Vector<3>(1.0, 0.0, 0.0).rotate(mEntity.getOrientation());
double theta = atan2(xVec.y(), xVec.x()); // rotation about Z
WFMath::RotMatrix<2> rm;
poly.rotatePoint(rm.rotation(theta), WFMath::Point<2>(0, 0));
poly.shift(WFMath::Vector<2>(mEntity.getPosition().x(), mEntity.getPosition().y()));
mArea->setShape(poly);
return true;
} else {
return false;
}
}
void TerrainArea::parse(const Atlas::Message::Element& value, Mercator::Area** area)
{
if (!value.isMap()) {
S_LOG_FAILURE("TerrainArea element ('area') must be of map type.");
return;
}
const Atlas::Message::MapType& areaData = value.Map();
TerrainAreaParser parser;
if (!parser.parseArea(areaData, mParsedPoly, mParsedLayer)) {
return;
} else {
WFMath::Polygon<2> poly = mParsedPoly;
if (!placeArea(poly)) {
return;
}
//TODO: handle holes
*area = new Mercator::Area(mParsedLayer, false);
(*area)->setShape(poly);
}
}
