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/*
* Copyright 2012 osmdroid authors: Viesturs Zarins, Martin Pearman
* Copyright 2012 Hannes Janetzek
* Copyright 2016-2017 devemux86
* Copyright 2016 Pedinel
*
* This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
*
* This program is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with
* this program. If not, see .
*/
package org.oscim.layers.vector;
import com.vividsolutions.jts.geom.LineString;
import org.oscim.core.GeoPoint;
import org.oscim.layers.vector.geometries.LineDrawable;
import org.oscim.layers.vector.geometries.Style;
import org.oscim.map.Map;
import org.oscim.utils.geom.GeomBuilder;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* This class draws a path line in given color or texture.
*/
public class PathLayer extends VectorLayer {
protected final ArrayList mPoints;
protected Style mStyle;
protected LineDrawable mDrawable;
public PathLayer(Map map, Style style) {
super(map);
mStyle = style;
mPoints = new ArrayList<>();
}
public PathLayer(Map map, int lineColor, float lineWidth) {
this(map, Style.builder()
.fixed(true)
.strokeColor(lineColor)
.strokeWidth(lineWidth)
.build());
}
public PathLayer(Map map, int lineColor) {
this(map, lineColor, 2);
}
public void setStyle(Style style) {
mStyle = style;
}
public void clearPath() {
if (!mPoints.isEmpty())
mPoints.clear();
updatePoints();
}
public void setPoints(Collection pts) {
mPoints.clear();
mPoints.addAll(pts);
updatePoints();
}
public void addPoint(GeoPoint pt) {
mPoints.add(pt);
updatePoints();
}
public void addPoint(int latitudeE6, int longitudeE6) {
mPoints.add(new GeoPoint(latitudeE6, longitudeE6));
updatePoints();
}
public void addPoints(Collection pts) {
mPoints.addAll(pts);
updatePoints();
}
private void updatePoints() {
synchronized (this) {
if (mDrawable != null) {
remove(mDrawable);
mDrawable = null;
}
if (!mPoints.isEmpty()) {
mDrawable = new LineDrawable(mPoints, mStyle);
if (mDrawable.getGeometry() == null)
mDrawable = null;
else
add(mDrawable);
}
}
mWorker.submit(0);
}
public List getPoints() {
return mPoints;
}
/**
* Draw a great circle. Calculate a point for every 100km along the path.
*
* @param startPoint start point of the great circle
* @param endPoint end point of the great circle
*/
public void addGreatCircle(GeoPoint startPoint, GeoPoint endPoint) {
synchronized (mPoints) {
/* get the great circle path length in meters */
double length = startPoint.sphericalDistance(endPoint);
/* add one point for every 100kms of the great circle path */
int numberOfPoints = (int) (length / 100000);
addGreatCircle(startPoint, endPoint, numberOfPoints);
}
}
/**
* Draw a great circle.
*
* @param startPoint start point of the great circle
* @param endPoint end point of the great circle
* @param numberOfPoints number of points to calculate along the path
*/
public void addGreatCircle(GeoPoint startPoint, GeoPoint endPoint,
final int numberOfPoints) {
/* adapted from page
* http://compastic.blogspot.co.uk/2011/07/how-to-draw-great-circle-on-map-in.html
* which was adapted from page http://maps.forum.nu/gm_flight_path.html */
GeomBuilder gb = new GeomBuilder();
/* convert to radians */
double lat1 = startPoint.getLatitude() * Math.PI / 180;
double lon1 = startPoint.getLongitude() * Math.PI / 180;
double lat2 = endPoint.getLatitude() * Math.PI / 180;
double lon2 = endPoint.getLongitude() * Math.PI / 180;
double d = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin((lat1 - lat2) / 2), 2)
+ Math.cos(lat1) * Math.cos(lat2)
* Math.pow(Math.sin((lon1 - lon2) / 2), 2)));
double bearing = Math.atan2(
Math.sin(lon1 - lon2) * Math.cos(lat2),
Math.cos(lat1) * Math.sin(lat2) - Math.sin(lat1)
* Math.cos(lat2)
* Math.cos(lon1 - lon2))
/ -(Math.PI / 180);
bearing = bearing < 0 ? 360 + bearing : bearing;
for (int i = 0, j = numberOfPoints + 1; i < j; i++) {
double f = 1.0 / numberOfPoints * i;
double A = Math.sin((1 - f) * d) / Math.sin(d);
double B = Math.sin(f * d) / Math.sin(d);
double x = A * Math.cos(lat1) * Math.cos(lon1) + B * Math.cos(lat2)
* Math.cos(lon2);
double y = A * Math.cos(lat1) * Math.sin(lon1) + B * Math.cos(lat2)
* Math.sin(lon2);
double z = A * Math.sin(lat1) + B * Math.sin(lat2);
double latN = Math.atan2(z, Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)));
double lonN = Math.atan2(y, x);
gb.point(latN / (Math.PI / 180), lonN / (Math.PI / 180));
}
setLineString(gb.toLineString());
}
public void setLineString(LineString path) {
synchronized (this) {
if (mDrawable != null)
remove(mDrawable);
mDrawable = new LineDrawable(path, mStyle);
add(mDrawable);
}
mWorker.submit(0);
}
public void setLineString(double[] lonLat) {
synchronized (this) {
if (mDrawable != null)
remove(mDrawable);
mDrawable = new LineDrawable(lonLat, mStyle);
add(mDrawable);
}
mWorker.submit(0);
}
}
