1. fixed errors when dragging over map by small distances

js/ui_init.js

@@ -798,6 +798,8 @@ function leaf_mousemove_nohc(e){
     var p0 = new L.LatLng(Data.camera.latitude,Data.camera.longitude);
     var p1 = new L.LatLng(Camera._latlng.lat,Camera._latlng.lng);
 
+    var p_origin = new L.LatLng(Data.camera.kml.latitude,Data.camera.kml.longitude);
+
     var dh = Camera._heading - Math.PI/180*Data.camera.heading;
 
     Data.camera.heading   = Camera._heading*180/Math.PI;
@@ -805,7 +807,9 @@ function leaf_mousemove_nohc(e){
     Data.camera.longitude = Camera._latlng.lng;
 
     if ((p0.lat!=p1.lat)||(p0.lng!=p1.lng)){
-        leaf_translation_v1(p0,p1);
+        // hypothesis: dragging by small distances introduces cumulative errors
+        //leaf_translation_v1(p0,p1);
+        leaf_translation_v1(p_origin,p1);
     }else{
         x3dom_rotation(dh);
     }
@@ -856,6 +860,7 @@ function leaf_update_x3dom_marker(p1_ll,p2_ll,index){
   var dp_w = x3dom_delta_map2scene(p1_ll,p2_ll);
 
   mark.x = dp_w.x;
+  mark.y = dp_w.y;
   mark.z = dp_w.z;
 
   if(!hecs){
@@ -870,13 +875,15 @@ function leaf_translation_v1(p0,p1){
 
     var dp_w = x3dom_delta_map2scene(p0,p1);
 
-    x3dom_translation(dp_w.x,dp_w.y,dp_w.z);
+    x3dom_translation_v2(dp_w.x,dp_w.y,dp_w.z);
 
     // if not updated then moving in 3D scene will make it jump
     Scene.old_view_translation = x3dom_getViewTranslation(Scene.element);
 
 }
 
+
+
 function x3d_mouseMove(){
 
     x3dom_update_map();

js/x3dom_functions.js

@@ -299,6 +299,7 @@ function x3dom_rotation(dangle){
 
 /*
  * translate camera in x3dom space
+ * not in use
  */
 function x3dom_translation(dx,dy,dz){
 
@@ -319,6 +320,28 @@ function x3dom_translation(dx,dy,dz){
 
 }
 
+/*
+ * set camera translation in x3dom space to x,y,z
+ */
+function x3dom_translation_v2(x,y,z){
+
+    var delta = new x3dom.fields.SFVec3f(x,y,z);
+
+    var mat = Scene.element.runtime.viewMatrix().inverse();
+
+    var from = mat.e3();
+    var at = from.subtract(mat.e2());
+    var up = mat.e1();
+
+    var newfrom = delta;
+    var newat = newfrom.subtract(mat.e2());
+
+    var newmat = x3dom.fields.SFMatrix4f.lookAt(newfrom, newat, up);
+
+    x3dom_setViewpoint(newmat);
+
+}
+
 function x3dom_altelev(alt,elev){
 
     //x3dom_matrix_test();