altosui: Display data for point nearest cursor in map view

[fw/altos] / altoslib / AltosMapPath.java

diff --git a/altoslib/AltosMapPath.java b/altoslib/AltosMapPath.java
index 7104b2f63767eede8705e61190a1d96a3572f156..54ff51fc11eb59dfcd257f39300acd8bd430e81b 100644 (file)
--- a/altoslib/AltosMapPath.java
+++ b/altoslib/AltosMapPath.java
@@ -32,8 +32,8 @@ public abstract class AltosMapPath {
 
        public abstract void paint(AltosMapTransform t);
 
-       public AltosMapRectangle add(double lat, double lon, int state) {
-               AltosMapPathPoint               point = new AltosMapPathPoint(new AltosLatLon (lat, lon), state);
+       public AltosMapRectangle add(double lat, double lon, double time, int state) {
+               AltosMapPathPoint               point = new AltosMapPathPoint(new AltosLatLon (lat, lon), time, state);
                AltosMapRectangle       rect = null;
 
                if (!point.equals(last_point)) {
@@ -45,6 +45,31 @@ public abstract class AltosMapPath {
                return rect;
        }
 
+       private double dist(AltosLatLon lat_lon, AltosMapPathPoint point) {
+               return (new AltosGreatCircle(lat_lon.lat,
+                                            lat_lon.lon,
+                                            point.lat_lon.lat,
+                                            point.lat_lon.lon)).distance;
+       }
+
+       public AltosMapPathPoint nearest(AltosLatLon lat_lon) {
+               AltosMapPathPoint nearest = null;
+               double nearest_dist = 0;
+               for (AltosMapPathPoint point : points) {
+                       if (nearest == null) {
+                               nearest = point;
+                               nearest_dist = dist(lat_lon, point);
+                       } else {
+                               double d = dist(lat_lon, point);
+                               if (d < nearest_dist) {
+                                       nearest = point;
+                                       nearest_dist = d;
+                               }
+                       }
+               }
+               return nearest;
+       }
+
        public void clear () {
                points = new LinkedList<AltosMapPathPoint>();
        }