Fixed a bug when coordinates of points are negative
Fixed a bug when coordinates of points are negative

aseldawy/spatialhadoop,aseldawy/spatialhadoop,aseldawy/spatialhadoop,aseldawy/spatialhadoop,aseldawy/spatialhadoop,aseldawy/spatialhadoop,aseldawy/spatialhadoop,aseldawy/spatialhadoop,aseldawy/spatialhadoop