# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU Library General 
# Public License along with this library; if not, write to the 
# Free Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
# MA  02111-1307  USA

# Copyrights (C)
# for this R-port: 
#   1999 - 2007, Diethelm Wuertz, GPL
#   Diethelm Wuertz <wuertz@itp.phys.ethz.ch>
#   info@rmetrics.org
#   www.rmetrics.org
# for the code accessed (or partly included) from other R-ports:
#   see R's copyright and license files
# for the code accessed (or partly included) from contributed R-ports
# and other sources
#   see Rmetrics's copyright file 


################################################################################
# FUNCTION:           GRID DATA:
#  gridData            Generates a grid data set
#  persp.gridData      Generates a perspective plot from a grid data object
#  contour.gridData    Generates a contour plot from a grid data object
################################################################################


test.gridData = 
function()
{
    #  gridData            Generates a grid data set
    #  persp.gridData      Generates a perspective plot from a grid data object
    #  contour.gridData    Generates a contour plot from a grid data object
     
    # Generate Grid Data:
    gD = gridData()
    
    # Perspective Plot:
    persp(gD)
    
    # Contour Plot:
    contour(gD) 
    
    # Return Value:
    return()    
}


# ------------------------------------------------------------------------------


test.gridDataPlot = 
function()
{
    if (FALSE) {
        
        require(akima)
        
        #  gridData            Generates a grid data set
        #  persp.gridData      Generates a perspective plot from a grid data object
        #  contour.gridData    Generates a contour plot from a grid data object
          
        # Generate Akima interpolated Grid Data:
        RNGkind(kind = "Marsaglia-Multicarry", normal.kind = "Inversion")
        set.seed(4711, kind = "Marsaglia-Multicarry")
        x = runif(999)-0.5
        y = runif(999)-0.5
        z = cos(2*pi*(x^2+y^2))
        ans = akimaInterp(x, y, z, extrap = FALSE)
        persp(ans)
        title(main = "Akima Interpolation") 
        contour(ans)
        title(main = "Akima Interpolation") 
        
        # Generate Kriged Grid Data:
        require(spatial)
        RNGkind(kind = "Marsaglia-Multicarry", normal.kind = "Inversion")
        set.seed(4711, kind = "Marsaglia-Multicarry")
        x = runif(999)-0.5
        y = runif(999)-0.5
        z = cos(2*pi*(x^2+y^2))
        ans = krigeInterp(x, y, z, extrap = FALSE)
        persp(ans)
        title(main = "Kriging") 
        contour(ans)
        title(main = "Kriging") 
        
    }
    
    # Return Value:
    return()    
}


################################################################################