// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.data.osm.visitor;
import java.util.Collection;
import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.Bounds;
import org.openstreetmap.josm.data.ProjectionBounds;
import org.openstreetmap.josm.data.coor.CachedLatLon;
import org.openstreetmap.josm.data.coor.EastNorth;
import org.openstreetmap.josm.data.coor.LatLon;
import org.openstreetmap.josm.data.osm.Node;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.data.osm.Relation;
import org.openstreetmap.josm.data.osm.RelationMember;
import org.openstreetmap.josm.data.osm.Way;
/**
* Calculates the total bounding rectangle of a series of {@link OsmPrimitive} objects, using the
* EastNorth values as reference.
* @author imi
*/
public class BoundingXYVisitor extends AbstractVisitor {
private ProjectionBounds bounds = null;
@Override
public void visit(Node n) {
visit(n.getEastNorth());
}
@Override
public void visit(Way w) {
if (w.isIncomplete()) return;
for (Node n : w.getNodes()) {
visit(n);
}
}
@Override
public void visit(Relation e) {
// only use direct members
for (RelationMember m : e.getMembers()) {
if (!m.isRelation()) {
m.getMember().accept(this);
}
}
}
public void visit(Bounds b) {
if(b != null)
{
visit(b.getMin());
visit(b.getMax());
}
}
public void visit(ProjectionBounds b) {
if(b != null)
{
visit(b.getMin());
visit(b.getMax());
}
}
public void visit(LatLon latlon) {
if(latlon != null)
{
if(latlon instanceof CachedLatLon) {
visit(((CachedLatLon)latlon).getEastNorth());
} else {
visit(Main.getProjection().latlon2eastNorth(latlon));
}
}
}
public void visit(EastNorth eastNorth) {
if (eastNorth != null) {
if (bounds == null) {
bounds = new ProjectionBounds(eastNorth);
} else {
bounds.extend(eastNorth);
}
}
}
public boolean hasExtend()
{
return bounds != null && !bounds.getMin().equals(bounds.getMax());
}
/**
* @return The bounding box or <code>null</code> if no coordinates have passed
*/
public ProjectionBounds getBounds() {
return bounds;
}
/**
* Enlarges the calculated bounding box by 0.002 degrees.
* If the bounding box has not been set (<code>min</code> or <code>max</code>
* equal <code>null</code>) this method does not do anything.
*/
public void enlargeBoundingBox() {
enlargeBoundingBox(Main.pref.getDouble("edit.zoom-enlarge-bbox", 0.002));
}
/**
* Enlarges the calculated bounding box by the specified number of degrees.
* If the bounding box has not been set (<code>min</code> or <code>max</code>
* equal <code>null</code>) this method does not do anything.
*
* @param enlargeDegree
*/
public void enlargeBoundingBox(double enlargeDegree) {
if (bounds == null)
return;
LatLon minLatlon = Main.getProjection().eastNorth2latlon(bounds.getMin());
LatLon maxLatlon = Main.getProjection().eastNorth2latlon(bounds.getMax());
bounds = new ProjectionBounds(
Main.getProjection().latlon2eastNorth(new LatLon(minLatlon.lat() - enlargeDegree, minLatlon.lon() - enlargeDegree)),
Main.getProjection().latlon2eastNorth(new LatLon(maxLatlon.lat() + enlargeDegree, maxLatlon.lon() + enlargeDegree)));
}
/**
* Enlarges the bounding box up to <code>maxEnlargePercent</code>, depending on
* its size. If the bounding box is small, it will be enlarged more in relation
* to its beginning size. The larger the bounding box, the smaller the change,
* down to the minimum of 1% enlargement.
*
* Warning: if the bounding box only contains a single node, no expansion takes
* place because a node has no width/height. Use <code>enlargeToMinDegrees</code>
* instead.
*
* Example: You specify enlargement to be up to 100%.
*
* Bounding box is a small house: enlargement will be 95–100%, i.e.
* making enough space so that the house fits twice on the screen in
* each direction.
*
* Bounding box is a large landuse, like a forest: Enlargement will
* be 1–10%, i.e. just add a little border around the landuse.
*
* If the bounding box has not been set (<code>min</code> or <code>max</code>
* equal <code>null</code>) this method does not do anything.
*
* @param maxEnlargePercent
*/
public void enlargeBoundingBoxLogarithmically(double maxEnlargePercent) {
if (bounds == null)
return;
double diffEast = bounds.getMax().east() - bounds.getMin().east();
double diffNorth = bounds.getMax().north() - bounds.getMin().north();
double enlargeEast = Math.min(maxEnlargePercent - 10*Math.log(diffEast), 1)/100;
double enlargeNorth = Math.min(maxEnlargePercent - 10*Math.log(diffNorth), 1)/100;
visit(bounds.getMin().add(-enlargeEast/2, -enlargeNorth/2));
visit(bounds.getMax().add(+enlargeEast/2, +enlargeNorth/2));
}
/**
* Specify a degree larger than 0 in order to make the bounding box at least
* the specified size in width and height. The value is ignored if the
* bounding box is already larger than the specified amount.
*
* If the bounding box has not been set (<code>min</code> or <code>max</code>
* equal <code>null</code>) this method does not do anything.
*
* If the bounding box contains objects and is to be enlarged, the objects
* will be centered within the new bounding box.
*
* @param size minimum width and height in meter
*/
public void enlargeToMinSize(double size) {
if (bounds == null)
return;
// convert size from meters to east/north units
double en_size = size * Main.map.mapView.getScale() / Main.map.mapView.getDist100Pixel() * 100;
visit(bounds.getMin().add(-en_size/2, -en_size/2));
visit(bounds.getMax().add(+en_size/2, +en_size/2));
}
@Override public String toString() {
return "BoundingXYVisitor["+bounds+"]";
}
public void computeBoundingBox(Collection<? extends OsmPrimitive> primitives) {
if (primitives == null) return;
for (OsmPrimitive p: primitives) {
if (p == null) {
continue;
}
p.accept(this);
}
}
}