Cliffs now appear more or less correctly.

Added cliffs to default_priorities
Ignore cliff files when constructing terrain
Use cliff files when calculating elevations
Set up chopper to allow file extension to be specified
Specify cliff file name when chopping
Allow chopper to chop lines as well as polygons.

src/BuildTiles/Main/default_priorities.txt

@@ -30,7 +30,7 @@ River			stream
 IntermittentStream	stream
 Watercourse		stream
 Canal			stream
-Cliff                   cliff   # A cliff face
+Cliffs                  cliff   # A cliff face
 Glacier			other	# Solid ice/snow
 PackIce			other	# Water with ice packs
 PolarIce		other
@@ -86,7 +86,9 @@ ShrubGrassCover		other	# Mixed Shrubland/Grassland
 SavannaCover		other	# Savanna
 Orchard			other	# Orchard
 DeciduousForest		other	# Deciduous Forest
+DeciduousBroadCover	other	# Deciduous Forest
 EvergreenForest		other	# Evergreen Forest
+EvergreenBroadCover	other	# Evergreen Forest
 MixedForest		other	# Mixed Forest
 RainForest		other	# Rain Forest
 BarrenCover		other	# Barren or Sparsely Vegetated

src/BuildTiles/Main/tgconstruct_poly.cxx

@@ -67,8 +67,10 @@ int TGConstruct::LoadLandclassPolys( void ) {
             }
 
             string lext = p.complete_lower_extension();
+            string lastext = p.extension();
             if ((lext == "arr") || (lext == "arr.gz") || (lext == "btg.gz") ||
-                (lext == "fit") || (lext == "fit.gz") || (lext == "ind"))
+                (lext == "fit") || (lext == "fit.gz") || (lext == "ind") ||
+                (lastext == "cliffs"))
             {
                 // skipped!
             } else {

src/Lib/Array/array.cxx

@@ -24,6 +24,7 @@
 #endif
 
 #include <cstring>
+#include <iomanip>   //for setprecision
 
 #include <simgear/compiler.h>
 #include <simgear/io/iostreams/sgstream.hxx>
@@ -120,12 +121,8 @@ bool TGArray::load_cliffs(const string & height_base)
       continue;
     }
 
-    string lext = p.complete_lower_extension();
+    string lext = p.lower_extension();
-    if ((lext == "arr") || (lext == "arr.gz") || (lext == "btg.gz") ||
+    if (lext == "cliffs") {
-        (lext == "fit") || (lext == "fit.gz") || (lext == "ind"))
-      {
-        // skipped!
-      } else {
       gzFile fp = gzopen( p.c_str(), "rb" );
       unsigned int count;
       sgReadUInt( fp, &count );
@@ -572,7 +569,8 @@ double TGArray::altitude_from_grid( double lon, double lat ) const {
         elev = get_array_elev(corners[0][0],corners[0][1]);
         break;
       case 0:    // all points on wrong side, fall through to normal calc
-        SG_LOG(SG_GENERAL, SG_WARN, "All elevation grid points on wrong side of cliff for " << londeg << "," << latdeg );
+        SG_LOG(SG_GENERAL, SG_WARN, "All elevation grid points on wrong side of cliff for " << std::setprecision(10) << londeg << "," << latdeg );
+        SG_LOG(SG_GENERAL, SG_WARN, "Grid points ("<< std::setprecision(9) << lon1 << "," << lat1 << "),("<<lon2<<","<<lat2<<")");
       default:                // all corners
         dx = xlocal - xindex;
         dy = ylocal - yindex;

src/Lib/terragear/tg_chopper.cxx

@@ -11,8 +11,7 @@
 #include "tg_misc.hxx"
 
 tgPolygon tgChopper::Clip( const tgPolygon& subject,
-                      const std::string& type,
+                      const std::string& type, SGBucket& b)
-                      SGBucket& b )
 {
     tgPolygon base, result;
 
@@ -63,6 +62,7 @@ void tgChopper::ClipRow( const tgPolygon& subject, const double& center_lat, con
     }
 }
 
+
 void tgChopper::Add( const tgPolygon& subject, const std::string& type)
 {
     // bail out immediately if polygon is empty
@@ -205,7 +205,7 @@ void tgChopper::Save( bool DebugShapefiles )
         long int poly_index = GenerateIndex( path );
 
         sprintf( poly_ext, "%ld", poly_index );
-        polyfile = polyfile + "." + poly_ext;
+        polyfile = polyfile + "." + poly_ext + "." + extra_extension;
 
         gzFile fp;
         if ( (fp = gzopen( polyfile.c_str(), "wb9" )) == NULL ) {

src/Lib/terragear/tg_chopper.hxx

@@ -11,10 +11,14 @@ class tgChopper
 public:
     tgChopper( const std::string& path ) {
         root_path = path;
+        extra_extension = "";
     }
 
     void Add( const tgPolygon& poly, const std::string& type );
     void Save( bool DebugShapes );
+  void Add_Extension( const std::string& extension) {
+    extra_extension = extension;
+  }
 
 private:
     long int GenerateIndex( std::string path );
@@ -25,4 +29,5 @@ private:
     std::string      root_path;
     bucket_polys_map bp_map;
     SGMutex          lock;
+    std::string      extra_extension; //add at end of file name
 };

src/Lib/terragear/tg_contour.cxx

@@ -111,7 +111,11 @@ Then the line segments intersect if 0 <= t,u <= 1.
         double crossx = x1-nx1; double crossy = y1-ny1;
         double t = (crossx*nydif - crossy*nxdif)/denom;
         double u = -1*(xdif*crossy - ydif*crossx)/denom;
-        if (t >= 0.0 && t <= 1.0 && u >= 0.0 && u <= 1.0) intersect_ct++;
+        // We consider that an intersection at the edge of the line have
+        // not crossed
+        // over, that is, they lie on the same side, so we do not
+        // include equality in the comparisons
+        if (t > 0.0 && t < 1.0 && u > 0.0 && u < 1.0) intersect_ct++;
       }
     }
   }
@@ -848,14 +852,16 @@ tgContour tgContour::AddColinearNodes( const tgContour& subject, std::vector<SGG
     p0 = subject.GetNode( subject.GetSize() - 1 );
     p1 = subject.GetNode( 0 );
 
+    if (!subject.GetOpen()) {
       // add start of segment
       result.AddNode( p0 );
       
       // add intermediate points
       AddIntermediateNodes( p0, p1, nodes, result, SG_EPSILON*10, SG_EPSILON*4 );
-
+    }
-    // maintain original hole flag setting
+    // maintain original hole and openness flag setting
     result.SetHole( subject.GetHole() );
+    result.SetOpen( subject.GetOpen() );
 
     return result;
 }
@@ -879,14 +885,16 @@ tgContour tgContour::AddColinearNodes( const tgContour& subject, bool preserve3d
     p0 = subject.GetNode( subject.GetSize() - 1 );
     p1 = subject.GetNode( 0 );
 
+    if(!subject.GetOpen()) {
       // add start of segment
       result.AddNode( p0 );
       
       // add intermediate points
       AddIntermediateNodes( p0, p1, preserve3d, nodes, result, SG_EPSILON*10, SG_EPSILON*4 );
-    
+    }
-    // maintain original hole flag setting
+    // maintain original hole and open flag settings
     result.SetHole( subject.GetHole() );
+    result.SetOpen( subject.GetOpen() );
     
     return result;
 }

src/Lib/terragear/tg_contour.hxx

@@ -29,6 +29,7 @@ class tgContour
 public:
     tgContour() {
         hole = false;
+        keep_open = false;
     }
 
     void Erase() {
@@ -38,10 +39,19 @@ public:
     void SetHole( bool h ) {
         hole = h;
     }
+  
     bool GetHole( void ) const {
         return hole;
     }
 
+  bool GetOpen(void) const {
+    return keep_open;
+  }
+
+  void SetOpen(bool o) {
+    keep_open = o;
+  }
+
     unsigned int GetSize( void ) const {
         return node_list.size();
     }
@@ -138,6 +148,7 @@ public:
 private:
     std::vector<SGGeod>  node_list;
     bool hole;
+  bool keep_open;  //If non-closed contour, keep open
 };
 
 typedef std::vector <tgContour>  tgcontour_list;

src/Lib/terragear/tg_polygon.hxx

@@ -243,6 +243,7 @@ class tgPolygon
 public:
     tgPolygon() {
         preserve3d = false;
+        closed = true;
     }
     ~tgPolygon() {
         contours.clear();
@@ -351,6 +352,18 @@ public:
         flag = f;
     }
 
+  void SetOpen( void ) {   //Do not try to close the contours
+    closed = false;
+  }
+
+  void SetClosed (void) {
+    closed = true;
+  }
+
+  bool IsClosed( void ) const {
+    return closed;
+  }   
+
     bool GetPreserve3D( void ) const {
         return preserve3d;
     }
@@ -436,6 +449,7 @@ public:
     // Conversions
     static ClipperLib::Paths ToClipper( const tgPolygon& subject );
     static tgPolygon FromClipper( const ClipperLib::Paths& subject );
+    static tgPolygon FromClipper( const ClipperLib::PolyTree& subject );
     static void ToClipperFile( const tgPolygon& subject, const std::string& path, const std::string& filename );
     
     // T-Junctions and segment search
@@ -460,6 +474,7 @@ private:
     bool            preserve3d;
     unsigned int    id;         // unique polygon id for debug
     tgTexParams     tp;
+  bool            closed;       // if we treat it as a closed shape
 };
 
 #endif // _POLYGON_HXX

src/Lib/terragear/tg_polygon_clip.cxx

@@ -136,6 +136,7 @@ tgPolygon tgPolygon::Diff( const tgPolygon& subject, tgPolygon& clip )
     return result;
 }
 
+//Intersect will keep open paths open
 tgPolygon tgPolygon::Intersect( const tgPolygon& subject, const tgPolygon& clip)
 {
     tgPolygon result;
@@ -156,17 +157,23 @@ tgPolygon tgPolygon::Intersect( const tgPolygon& subject, const tgPolygon& clip
 
     ClipperLib::Paths clipper_subject = tgPolygon::ToClipper( subject );
     ClipperLib::Paths clipper_clip    = tgPolygon::ToClipper( clip );
-    ClipperLib::Paths clipper_result;
+    ClipperLib::Paths clipper_result;   // for closed polygons
+    ClipperLib::PolyTree clipper_tree_result; //for open polygons
 
     ClipperLib::Clipper c;
     c.Clear();
-    c.AddPaths(clipper_subject, ClipperLib::ptSubject, true);
+    c.AddPaths(clipper_subject, ClipperLib::ptSubject, subject.IsClosed());
     c.AddPaths(clipper_clip, ClipperLib::ptClip, true);
+    if(subject.IsClosed()) {
       c.Execute(ClipperLib::ctIntersection, clipper_result, ClipperLib::pftEvenOdd, ClipperLib::pftEvenOdd);
 
       result = tgPolygon::FromClipper( clipper_result );
+    }
+    else {
+      c.Execute(ClipperLib::ctIntersection, clipper_tree_result, ClipperLib::pftEvenOdd, ClipperLib::pftEvenOdd);
+      result = tgPolygon::FromClipper( clipper_tree_result );
+    }
     result = tgPolygon::AddColinearNodes( result, all_nodes );
-
     result.SetMaterial( subject.GetMaterial() );
     result.SetTexParams( subject.GetTexParams() );
     result.SetId( subject.GetId() );
@@ -199,6 +206,17 @@ tgPolygon tgPolygon::FromClipper( const ClipperLib::Paths& subject )
     return result;
 }
 
+// A polytree is returned when an open polygon has been clipped
+tgPolygon tgPolygon::FromClipper( const ClipperLib::PolyTree& subject )
+{
+  ClipperLib::Paths path_result;
+    tgPolygon result;
+    ClipperLib::PolyTreeToPaths(subject,path_result);
+    result = FromClipper(path_result);
+    return result;
+}
+
+
 ClipperLib::Path tgTriangle::ToClipper( const tgTriangle& subject )
 {
     ClipperLib::Path  contour;