Bug fix : NPE when the first SurfaceLine of a Surface is null in getZMap() method in Surface class.

Replacement of surfaceLines.length and surfaceLines[0].length by GetWidth() and getHeight() methods

src/main/java/fr/pasteur/ida/zellige/surfaceConstruction/element/Surface.java

@@ -147,7 +147,7 @@ public class Surface
      *
      * @return the identical transposed {@link Surface}
      */
-    public Surface transpose(int length)
+    public Surface transpose( int length )
     {
         Surface surface = new Surface( Math.abs( this.dimension - 1 ), length );
         Class< ? > theClass;
@@ -231,15 +231,15 @@ public class Surface
     {
         ReferenceSurfaceExtraction.displaySurface( this );
         int count = 0;
-        Dimensions dim = FinalDimensions.wrap( new long[]{surfaceLines.length,surfaceLines[0].getLength() });
-        ImgFactory< UnsignedShortType > factory = Util.getArrayOrCellImgFactory(dim, new UnsignedShortType());
-        Img< UnsignedShortType > zMap = factory.create(dim);
+        Dimensions dim = FinalDimensions.wrap( new long[]{ getHeight(), getWidth() } );
+        ImgFactory< UnsignedShortType > factory = Util.getArrayOrCellImgFactory( dim, new UnsignedShortType() );
+        Img< UnsignedShortType > zMap = factory.create( dim );
         RandomAccess< UnsignedShortType > randomAccess = zMap.randomAccess();
         for ( SurfaceLine surfaceLine : this.get() )
         {
             if ( surfaceLine != null )
             {
-                randomAccess.setPosition(surfaceLine.getLine(), 0);
+                randomAccess.setPosition( surfaceLine.getLine(), 0 );
                 for ( int i = 0; i <= surfaceLine.getDimension().length - 1; i++ )
                 {
                     Pixels pixel = surfaceLine.get( i );
@@ -248,25 +248,25 @@ public class Surface
                         if ( pixel.size() > 1 )
                         {
                             count++;
-                            int z = averageIntZ( pixel ) ;
-                            if ( z != -1 )
+                            int z = averageIntZ( pixel );
+                            if ( z != - 1 )
                             {
-                                randomAccess.setPosition(i, 1);
-                                randomAccess.get().set(new UnsignedShortType(z + 1));
+                                randomAccess.setPosition( i, 1 );
+                                randomAccess.get().set( new UnsignedShortType( z + 1 ) );
                             }
                         }
                         else
                         {
                             int z = pixel.get( 0 ).getZ();
-                            randomAccess.setPosition(i, 1);
-                            randomAccess.get().set(new UnsignedShortType(z + 1));
+                            randomAccess.setPosition( i, 1 );
+                            randomAccess.get().set( new UnsignedShortType( z + 1 ) );
                         }
                     }
                 }
             }
         }
         ImageJFunctions.show( zMap, "after getzmap" );
-        System.out.println(" Thre count =  " + count);
+        System.out.println( " Thre count =  " + count );
         return zMap;
     }
 
@@ -284,7 +284,7 @@ public class Surface
         {
             return ( z1 + z2 ) / 2;
         }
-        return -1;
+        return - 1;
     }
 
     /**
@@ -308,16 +308,17 @@ public class Surface
 
     public int getWidth()
     {
-        for ( SurfaceLine surfaceLine: surfaceLines
-               )
+        for ( SurfaceLine surfaceLine : surfaceLines
+        )
         {
-            if (surfaceLine !=  null)
+            if ( surfaceLine != null )
             {
                 return surfaceLine.getLength();
             }
         }
         return 0;
     }
+
     public int getHeight()
     {
         return this.surfaceLines.length;