altosuilib: Rewrite map GUI bits

[fw/altos] / altosuilib / AltosUIMapTransform.java

diff --git a/altosuilib/AltosUIMapTransform.java b/altosuilib/AltosUIMapTransform.java
new file mode 100644 (file)
index 0000000..e6f1ffe
--- /dev/null
+++ b/altosuilib/AltosUIMapTransform.java
@@ -0,0 +1,106 @@
+/*
+ * 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_2;
+
+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_4.*;
+
+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;
+       }
+}