public void Test_SubGrid_GetWorldOrigin()
{
ISubGrid leafSubgrid = null;
SubGridTree tree = new SubGridTree(SubGridTreeConsts.SubGridTreeLevels, 1.0, new SubGridFactory <NodeSubGrid, LeafSubGrid>());
leafSubgrid = new SubGrid(tree, null, SubGridTreeConsts.SubGridTreeLevels);
double WorldOriginX, WorldOriginY;
leafSubgrid.CalculateWorldOrigin(out WorldOriginX, out WorldOriginY);
// World origin of leaf subgrid is the extreme origin of the overmapped world coordinate system (cell coordinate system * cell size)
// as the cell origin position is 0, 0 in the cell address space for a newly created subgrid
// The leaf So, both X and Y origin values
Assert.Equal(WorldOriginX, WorldOriginY);
Assert.Equal(WorldOriginX, (-tree.IndexOriginOffset * tree.CellSize));
}