public void calculateVisibleElements(Envelope envelope, int zoom) {
if (zoom < minZoom) {
setVisibleElementsList(null);
return;
}
if (userColumns[0] == null) return;
if (renderOnce) {
renderOnce = false;
List<Geometry> geometries = spatialiteLayer.getVisibleElements();
if (geometries == null || geometries.size() == 0) {
setVisibleElementsList(null);
return;
}
objects = new Vector<Text>();
for (Geometry geom : geometries) {
GeometryData userData = (GeometryData) geom.userData;
String name = userData.label;
MapPos topRight = null;
if (geom instanceof Point) {
topRight = ((Point) geom).getMapPos();
} else if (geom instanceof Line) {
topRight = ((Line) geom).getVertexList().get(0);
} else if (geom instanceof Polygon) {
try {
MapPos center =
SpatialiteUtil.computeCentroid((Polygon) GeometryUtil.convertGeometryToWgs84(geom));
topRight = GeometryUtil.convertFromWgs84(center);
} catch (Exception e) {
topRight = new MapPos(0, 0);
FLog.e("error computing centroid of polygon", e);
}
} else {
FLog.e("invalid geometry type");
}
Text newText = new Text(topRight, name, styleSet, null);
newText.attachToLayer(this);
newText.setActiveStyle(zoom);
objects.add(newText);
}
setVisibleElementsList(objects);
}
}
public void loadData(Envelope envelope, int zoom) {
// long time = System.currentTimeMillis();
try {
ArrayList<MapPos> pts = mapView.getMapBoundaryPts();
Vector<Geometry> objectTemp = null;
Vector<Geometry> objects = new Vector<Geometry>();
GeometryData.Type dataType;
if (type == Type.ENTITY) {
dataType = GeometryData.Type.ENTITY;
objectTemp =
dbmgr.fetchAllVisibleEntityGeometry(
pts, querySql, renderAll ? FaimsSettings.MAX_VECTOR_OBJECTS : maxObjects);
} else if (type == Type.RELATIONSHIP) {
dataType = GeometryData.Type.RELATIONSHIP;
objectTemp =
dbmgr.fetchAllVisibleRelationshipGeometry(
pts, querySql, renderAll ? FaimsSettings.MAX_VECTOR_OBJECTS : maxObjects);
} else {
throw new Exception("database layer has no type");
}
createElementsInLayer(zoom, objectTemp, objects, dataType);
setVisibleElementsList(objects);
} catch (Exception e) {
FLog.e("error rendering database layer", e);
}
if (textLayer != null) {
textLayer.renderOnce();
textLayer.calculateVisibleElements(envelope, zoom);
}
// FLog.d("time: " + (System.currentTimeMillis() - time) / 1000);
}