Comments on map process and better zoom, centering and display
This commit is contained in:
Carlos Galindo
parent
3c3c1fca33
commit
a8c6e79e2e
GPG key ID:
83E68706DEE119A3
1 changed files with 61 additions and 32 deletions
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@ -239,55 +239,84 @@ public class DashboardController implements Initializable, MapComponentInitializ
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@Override
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public void mapInitialized() {
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System.err.println("mapInitialized begin with " + track.getNumPoints());
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// When the JS init is done
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final int N = 0, S = 1, E = 2, W = 3;
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final double[] coord = new double[4];
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coord[0] = Double.MIN_VALUE;
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coord[1] = Double.MAX_VALUE;
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coord[2] = Double.MIN_VALUE;
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coord[3] = Double.MAX_VALUE;
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MapOptions mapOptions = new MapOptions();
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mapOptions.center(new LatLong(
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track.getChunks().get(track.getNumPoints() / 2).getFirstPoint().getLatitude(),
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track.getChunks().get(track.getNumPoints() / 2).getFirstPoint().getLongitude()))
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// Create a new map with the appropriate options
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GoogleMap map = mapView.createMap(new MapOptions()
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.center(new LatLong(0.0, 0.0))
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.mapType(MapTypeIdEnum.TERRAIN)
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.overviewMapControl(true)
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.panControl(false)
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.rotateControl(false)
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.scaleControl(true)
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.streetViewControl(false)
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.zoomControl(false)
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.zoom(10);
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.zoomControl(true)
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.zoom(0)
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);
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GoogleMap map = mapView.createMap(mapOptions);
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//Add a marker to the map
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// Prepare an array with LatLong objects
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MVCArray pathArray = new MVCArray();
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System.err.println("mapInitialized pathArray created");
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pathArray.push(new LatLong( // first step of the route
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track.getChunks().get(0).getFirstPoint().getLatitude(),
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track.getChunks().get(0).getFirstPoint().getLongitude()
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));
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track.getChunks().forEach(chunk -> {
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double lat = chunk.getFirstPoint().getLatitude();
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double lon = chunk.getFirstPoint().getLongitude();
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coord[0] = Math.max(lat, coord[0]);
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coord[1] = Math.min(lat, coord[1]);
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coord[2] = Math.max(lon, coord[2]);
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coord[3] = Math.min(lon, coord[3]);
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double lat = chunk.getLastPoint().getLatitude();
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double lon = chunk.getLastPoint().getLongitude();
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coord[N] = Math.max(lat, coord[N]);
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coord[S] = Math.min(lat, coord[S]);
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coord[E] = Math.max(lon, coord[E]);
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coord[W] = Math.min(lon, coord[W]);
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pathArray.push(new LatLong(lat, lon));
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});
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pathArray.push(new LatLong(track.getChunks().get(track.getNumPoints() - 1).getLastPoint().getLatitude(),
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track.getChunks().get(track.getNumPoints() - 1).getLastPoint().getLongitude()));
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System.err.println("mapInitialized chunks added");
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map.addMapShape(new Polyline(
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new PolylineOptions()
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.path(pathArray)
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.strokeColor("red")
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.strokeWeight(2)
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.visible(true))
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);
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System.err.println("mapInitialized end");
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System.err.printf("Average coords: %.2fN, %.2S, %.2fE, %.2fW", coord[0], coord[1], coord[2], coord[3]);
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mapView.setCenter((coord[0] + coord[1]) / 2, (coord[2] + coord[3]) / 2);
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// map.fitBounds(new LatLongBounds(new LatLong(coord[1], coord[3]), new LatLong(coord[0], coord[2])));
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// Create and add the polyline using the array
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// This polyline displays instantly with no problem
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// TODO: add color with PolylineOptions.strokeColor("#ffff00") to match the color schemes of the app
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// When using that method, the line does not load properly, it needs an update to the zoom to show up.
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map.addMapShape(new Polyline(new PolylineOptions().path(pathArray)));
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// Adjust the map to the correct center and zoom
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map.fitBounds(new LatLongBounds(
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new LatLong(coord[S], coord[W]),
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new LatLong(coord[N], coord[E])
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));
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map.setZoom(getBoundsZoomLevel(coord, mapView.getHeight(), mapView.getWidth()));
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// Print some debug info
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System.err.printf("Bound to coords: %.2fN, %.2S, %.2fE, %.2fW\n", coord[N], coord[S], coord[E], coord[W]);
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System.err.printf("Selected zoom: %d\n", map.getZoom());
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}
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/**
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* Method to compute properly the amount of zoom in a GMap
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* Many thanks to <a href=http://stackoverflow.com/a/13274361>http://stackoverflow.com/a/13274361</a>
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* @param bound Array with coordinates bounds [N, S, E, W]
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* @return Zoom from 0 to 21
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*/
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private int getBoundsZoomLevel(double[] bound, double mapHeight, double mapWidth) {
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double latFraction = (latRad(bound[0]) - latRad(bound[1])) / Math.PI;
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double lngDiff = bound[2] - bound[3];
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double lngFraction = ((lngDiff < 0) ? (lngDiff + 360) : lngDiff) / 360;
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double latZoom = zoom(mapHeight, 256, latFraction);
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double lngZoom = zoom(mapWidth, 256, lngFraction);
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return (int) Math.min(Math.min(latZoom, lngZoom), 21);
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}
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private double zoom(double mapPx, int worldPx, double fraction) {
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return Math.floor(Math.log(mapPx / worldPx / fraction) / Math.log(2));
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}
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private double latRad(double lat) {
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double sin = Math.sin(lat * Math.PI / 180);
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double radX2 = Math.log((1 + sin) / (1 - sin)) / 2;
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return Math.max(Math.min(radX2, Math.PI), -Math.PI) / 2;
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}
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}
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