Hi,
I need your help.
I have a grid data set which is in McIDAS GRID format with 20 rows and 28
columns.
Using the following codes, I got 4 displays shown at URL
http://enso.larc.nasa.gov/~helen/.
When rendering the displays in X_Y domain (case 'a' and 'c'), they
looks similar using either DisplayImplJ2D or DisplayImplJ3D.
But the displays in Lat_Lon domain (case 'b' and 'd') are shown differently in
J2D and J3D. The display (case 'b') generated in DisplayImplJ2D and Lat_Lon
domain looks very strange. Where and how do
the triangles come from? How can I fix it?
In addition, the display of grids at 4 edges and 4 corners (case 'd') are been
trimmed, that is, only half grid or quarter of grid is displayed. How
can I get a display, which is showing full grid on the edges, in
LAT_LON domain?
Thank you very much in advance.
/Helen
---- java code to create the displays ------------------------
McIDASGridDirectory dir; // grid header (64 integers or words)
double [ ] gd; // grid data 20 rows by 28 columns
CoordinateSystem coordinateSystem = dir.getCoordinateSystem();
RealType Nx = RealType.getRealType("Nx");
RealType Ny = RealType.getRealType("Ny");
RealType value_type = RealType.getRealType("Grid");
RealType [] domain_components = {Nx,Ny};
RealTupleType grid_domain
new RealTupleType(domain_components,
coordinateSystem, null);
Integer2DSet dom_set
new Integer2DSet(grid_domain, dir.getColumns(),
dir.getRows());
FunctionType grid_type = new FunctionType(grid_domain,
value_type);
FlatField vals_ff = new FlatField(grid_type, dom_set);
double [][] gdata = new double[1][];
gdata[0] = gd;
vals_ff.setSamples(gdata,false);
DisplayImpl display;
ScalarMap latMap;
ScalarMap lonMap;
ScalarMap rgbMap;
char c;
switch (c) {
case 'a':
display = new DisplayImplJ2D("thedisplay");
lonMap = new ScalarMap( Nx, Display.XAxis );
latMap = new ScalarMap( Ny, Display.YAxis );
break;
case 'b':
display = new DisplayImplJ2D("thedisplay");
lonMap = new ScalarMap(RealType.Longitude,
Display.XAxis);
latMap = new ScalarMap(RealType.Latitude,
Display.YAxis);
break;
case 'c':
display = new DisplayImplJ3D("thedisplay",
new TwoDDisplayRendererJ3D());
lonMap = new ScalarMap( Nx, Display.XAxis );
latMap = new ScalarMap( Ny, Display.YAxis );
break;
case 'd':
display = new DisplayImplJ3D("thedisplay", new
TwoDDisplayRendererJ3D());
lonMap = new ScalarMap(RealType.Longitude,
Display.XAxis);
latMap = new ScalarMap(RealType.Latitude,
Display.YAxis);
break;
}
rgbMap = new ScalarMap(value_type, Display.RGB);
// Add maps to display
display.addMap( lonMap );
display.addMap( latMap );
display.addMap( rgbMap );
GraphicsModeControl dispGMC = (GraphicsModeControl)
display.getGraphicsModeControl();
dispGMC.setScaleEnable(true);
// Create a data reference and set the FlatField as our data
DataReferenceImpl data_ref = new DataReferenceImpl("data_ref");
data_ref.setData( vals_ff );
display.addReference( data_ref );
------------ end of java code-------------------------------
