add distanceFromTo block

2 files changed, 12 insertions, 0 deletions

diff --git a/objects.js b/objects.js
index e76992b..f757ea4 100644
--- a/objects.js
+++ b/objects.js
@@ -881,6 +881,11 @@ SpriteMorph.prototype.initBlocks = function () {
             category: 'sensing',
             spec: 'distance to %dst'
         },
+        reportDistanceFromTo: {
+            type: 'reporter',
+            category: 'sensing',
+            spec: 'distance from longitude: %n latitude: %n to lon: %n lat: %n'
+        },
         doResetTimer: {
             type: 'command',
             category: 'sensing',
@@ -2038,6 +2043,7 @@ SpriteMorph.prototype.blockTemplates = function (category) {
         blocks.push(block('reportKeyPressed'));
         blocks.push('-');
         blocks.push(block('reportDistanceTo'));
+        blocks.push(block('reportDistanceFromTo'));
         blocks.push('-');
         blocks.push(block('doResetTimer'));
         blocks.push(watcherToggle('getTimer'));
diff --git a/threads.js b/threads.js
index 519922c..2817144 100644
--- a/threads.js
+++ b/threads.js
@@ -2509,6 +2509,12 @@ Process.prototype.reportDistanceTo = function (name) {
     return 0;
 };
 
+Process.prototype.reportDistanceFromTo = function (lon1, lat1, lon2, lat2) {
+    var thisPoint = L.latLng(lat1, lon1),
+        thatPoint = L.latLng(lat2, lon2);
+    return thisPoint.distanceTo(thatPoint);
+};
+
 Process.prototype.reportAttributeOf = function (attribute, name) {
     var thisObj = this.blockReceiver(),
         thatObj,