Fix dragging of map rectangle, polygon, polyline items

Now works when dragged across dateline, over min/max latitdues,
and into the screen from screen edges (in which case items were
previous clipped by viewport).

Also made MapRectangle a geographic element, and updated
declarative_ui test to reflect this change. Docs are also updated.

One behaviora1 change - calling x(), y() on map items now returns
the true top left point of map item (which makes more sense)
as opposed to the clipped top left point.

Task-number: QTBUG-25776, QTBUG-25400, QTBUG-25794
Change-Id: I5f8d05103bdcc6ee396dabd0c787ac61861dd9cb
Reviewed-by: Thomas Lowe <thomas.lowe@nokia.com>
Reviewed-by: Alex Wilson <alex.wilson@nokia.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/location/qlocationutils_p.h b/src/location/qlocationutils_p.h
index 54710e42..af63faf3 100644
--- a/src/location/qlocationutils_p.h
+++ b/src/location/qlocationutils_p.h
@@ -69,6 +69,22 @@ public:
         return lng >= -180 && lng <= 180;
     }
 
+    inline static double clipLat(double lat) {
+        if (lat > 90)
+            lat = 90;
+        else if (lat < -90)
+            lat = -90;
+        return lat;
+    }
+
+    inline static double wrapLong(double lng) {
+        if (lng > 180)
+            lng -= 360;
+        else if (lng < -180)
+            lng += 360;
+        return lng;
+    }
+
     /*
         Creates a QGeoPositionInfo from a GGA, GLL, RMC, VTG or ZDA sentence.