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/*
* Copyright © 2014 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
package org.altusmetrum.altosuilib_3;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.lang.Math;
import java.awt.geom.*;
import java.util.*;
import java.util.concurrent.*;
import org.altusmetrum.altoslib_5.*;
public class AltosUIMapTransform {
double scale_x, scale_y;
double offset_x, offset_y;
public AltosUILatLon lat_lon (Point2D.Double point) {
double lat, lon;
double rads;
lon = point.x/scale_x;
rads = 2 * Math.atan(Math.exp(-point.y/scale_y));
lat = Math.toDegrees(rads - Math.PI/2);
return new AltosUILatLon(lat,lon);
}
public Point2D.Double screen_point(Point screen) {
return new Point2D.Double(screen.x + offset_x, screen.y + offset_y);
}
public AltosUILatLon screen_lat_lon(Point screen) {
return lat_lon(screen_point(screen));
}
public Point2D.Double point(AltosUILatLon lat_lon) {
double x, y;
double e;
x = lat_lon.lon * scale_x;
e = Math.sin(Math.toRadians(lat_lon.lat));
e = Math.max(e,-(1-1.0E-15));
e = Math.min(e, 1-1.0E-15 );
y = 0.5*Math.log((1+e)/(1-e))*-scale_y;
return new Point2D.Double(x, y);
}
public Point2D.Double screen(Point2D.Double point) {
return new Point2D.Double(point.x - offset_x, point.y - offset_y);
}
public Point screen(Point point) {
return new Point((int) (point.x - offset_x + 0.5),
(int) (point.y - offset_y + 0.5));
}
public Rectangle screen(AltosUIMapRectangle map_rect) {
Point2D.Double ul = screen(map_rect.ul);
Point2D.Double lr = screen(map_rect.lr);
return new Rectangle((int) ul.x, (int) ul.y, (int) (lr.x - ul.x), (int) (lr.y - ul.y));
}
public Point2D.Double screen(AltosUILatLon lat_lon) {
return screen(point(lat_lon));
}
private boolean has_location;
public boolean has_location() {
return has_location;
}
public AltosUIMapTransform(int width, int height, int zoom, AltosUILatLon centre_lat_lon) {
scale_x = 256/360.0 * Math.pow(2, zoom);
scale_y = 256/(2.0*Math.PI) * Math.pow(2, zoom);
Point2D.Double centre_pt = point(centre_lat_lon);
has_location = (centre_lat_lon.lat != 0 || centre_lat_lon.lon != 0);
offset_x = centre_pt.x - width / 2.0;
offset_y = centre_pt.y - height / 2.0;
}
}
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