Merge pull request #13 from JuliaGeo/bug-in-createCollection

Bug in create collection

Author: yeesian

src/LibGEOS.jl

@@ -8,21 +8,21 @@ module LibGEOS
 
     using Compat, GeoInterface
 
-    export  Point, LineString, MultiLineString, LinearRing, Polygon, MultiPolygon, GeometryCollection,
+    export  Point, MultiPoint, LineString, MultiLineString, LinearRing, Polygon, MultiPolygon, GeometryCollection,
             parseWKT, geomFromWKT, geomToWKT,
-            project, projectNormalized, interpolate, interpolateNormalized, 
+            project, projectNormalized, interpolate, interpolateNormalized,
             buffer, envelope, intersection, convexhull, difference, symmetricDifference,
             boundary, union, unaryUnion, pointOnSurface, centroid, node,
             polygonize, lineMerge, simplify, topologyPreserveSimplify, uniquePoints, sharedPaths,
             snap, delaunayTriangulation, delaunayTriangulationEdges,
-            disjoint, touches, intersects, crosses, within, contains, overlaps, equals, equalsexact, covers, coveredby, 
+            disjoint, touches, intersects, crosses, within, contains, overlaps, equals, equalsexact, covers, coveredby,
             prepareGeom, prepcontains, prepcontainsproperly, prepcoveredby, prepcovers, prepcrosses,
             prepdisjoint, prepintersects, prepoverlaps, preptouches, prepwithin,
             isEmpty, isSimple, isRing, hasZ, isClosed, isValid, normalize!, interiorRings, exteriorRing,
             numPoints, startPoint, endPoint, area, geomLength, distance, hausdorffdistance, nearestPoints
 
     include("geos_c.jl")
-    
+
     #  --- GEOSconnection ---
     type GEOSconnection
         status::Symbol
@@ -44,4 +44,4 @@ module LibGEOS
     include("geos_types.jl")
     include("geos_operations.jl")
     include("geo_interface.jl")
-end
+end

src/geos_functions.jl

@@ -352,7 +352,7 @@ end
 
 
 function createCollection(geomtype::Int, geoms::Vector{GEOSGeom})
-    result = GEOSGeom_createCollection(@compat(Int32(geomtype)), pointer(geoms), length(geoms))
+    result = GEOSGeom_createCollection(@compat(Int32(geomtype)), pointer(geoms), @compat(UInt32(length(geoms))))
     if result == C_NULL
         error("LibGEOS: Error in GEOSGeom_createCollection")
     end
@@ -1093,4 +1093,3 @@ end
 # Return 0 on exception, the closest points of the two geometries otherwise.
 # The first point comes from g1 geometry and the second point comes from g2.
 nearestPoints(g1::GEOSGeom, g2::GEOSGeom) = GEOSNearestPoints(g1, g2)
-