Re: [Geotools-gt2-users] Geotools question about raster rendering

[Jong L. <jon...@ya...>]

Jody,=0A=0AThank you for your answer. I will contact some authors to find o=
ut more...=0A=0A- Jong=0A=0A----- Original Message ----=0AFrom: Jody Garnet=
t <jga...@re...>=0ATo: Jong Lee <jon...@ya...>; geotools-=
users <geo...@li...>; Simone <sim...@gm...=
m>; Martin Desruisseaux <mar...@ge...>; Andrea Aime <and=
rea...@al...>; Alessio Fabiani <ale...@gm...>=0ASent=
: Thursday, August 23, 2007 5:01:16 PM=0ASubject: Re: Geotools question abo=
ut raster rendering=0A=0AI am afraid I do not know much about raster suppor=
t; I know it was slow =0Ain GeoTools 2.2 and I tell everyone to upgrade to =
2.3 or better :-) So =0Ayou are on the right track ...=0A=0AYou can try con=
tacting the module maintainer for the ArcGrid format (you =0Acan check in t=
he pom.xml file in your source download).=0A=0AAre you sure your ArcGrid fi=
le has color? I would suspect that green was =0Achosen as the default color=
 and your arcgrid ascii file is single band? =0AI think the mapping of data=
 into colors is the work of a =0ARasterSymbolizer (part of a Style) which y=
ou would have to supply.=0A=0ALooking at your example you *did* supply a ra=
ster symbolizer. Have you =0Atried stepping through the code to see if your=
 symbolizer is applied? I =0Ahad a horrible time upgrading the uDig raster =
rendering code to GeoTools =0A2.4 (the "new" GridCoverageRenderer does not =
have good javadocs.=0A=0AI would check the @author tag on that file and sta=
rt sending email). =0ASimone, Martin, Andrea and Alessio are listed - these=
 are the people =0Abest able to help.=0A=0AJody=0A=0A> Dear Jody Garnett,=
=0A>=0A> I posted a message about my problem, but nobody answered.  So, I a=
m sending you a message about this issues. I believe that you might know ab=
out this matter.=0A>=0A> The following is the message I posted:=0A> ----=0A=
> I used geotools 2.2.0 for rendering raster (ESRI ArcGrid Ascii file).=0A>=
  Now, I am upgrading to geotools 2.3.3 (or 2.3.4). Then, JMapPane=0A> disp=
lays the raster with one color (green).  I don't know what I am=0A> doing w=
rong.  The following is the code. Please help me out.=0A>=0A>=0A>=0A>      =
   mapPane =3D new JMapPane();=0A>=0A>=0A>         GTRenderer renderer =3D =
new StreamingRenderer();=0A>=0A>=0A>=0A>         mapPane.setRenderer( rende=
rer );=0A>=0A>=0A>         mapPane.setSize( 400, 400 );=0A>=0A>=0A>        =
 //        context =3D new DefaultMapContext( DefaultGeographicCRS.WGS84 );=
=0A>=0A>=0A>         context =3D new DefaultMapContext();=0A>=0A>=0A>=0A>  =
       setTitle( "raster test" );=0A>=0A>=0A>         addWindowListener( ne=
w WindowAdapter() {=0A>=0A>=0A>             public void windowClosing( Wind=
owEvent e )=0A>             {=0A>=0A>=0A>                 System.exit( 0 );=
=0A>=0A>=0A>             }=0A>=0A>=0A>         } );=0A>=0A>=0A>=0A>        =
 this.setBounds( 20, 20, 450, 450 );=0A>=0A>=0A>         mapPane.setContext=
( context );=0A>=0A>=0A>         getContentPane().add( mapPane );=0A>=0A>=
=0A>         setVisible( true );=0A>=0A>=0A>=0A>         File f =3D new Fil=
e( "D:\\works\\test.asc" );=0A>=0A>=0A>         ArcGridReader reader =3D ne=
w ArcGridReader( f );=0A>=0A>=0A>=0A>         GridCoverage gcDem =3D reader=
.read( null );=0A>=0A>=0A>         StyleBuilder sb =3D new StyleBuilder();=
=0A>=0A>=0A>=0A>         ColorMap cm =3D sb.createColorMap( new String[] { =
"0.5",=0A> "0.7" }, new double[] { 0.5, 0.7 }, new Color[] { new Color( 255=
, 0, 0=0A> ),=0A>=0A>=0A>                 new Color( 255, 255, 255 ) }, Col=
orMap.TYPE_RAMP );=0A>=0A>=0A>         RasterSymbolizer rsDem =3D sb.create=
RasterSymbolizer( cm, 1 );=0A>=0A>=0A>         Style demStyle =3D sb.create=
Style( rsDem );=0A>=0A>=0A>=0A>         context.addLayer( gcDem, demStyle )=
;=0A>=0A>=0A>=0A>         DirectPosition lowerCorner =3D gcDem.getEnvelope(=
).getLowerCorner();=0A>=0A>=0A>         DirectPosition upperCorner =3D gcDe=
m.getEnvelope().getUpperCorner();=0A>=0A>=0A>         Coordinate lowerCoord=
 =3D new Coordinate( lowerCorner.getCoordinates()[0], lowerCorner.getCoordi=
nates()[1] );=0A>=0A>=0A>         Coordinate upperCoord =3D new Coordinate(=
 upperCorner.getCoordinates()[0], upperCorner.getCoordinates()[1] );=0A>=0A=
>=0A>         Envelope envelope =3D new Envelope( lowerCoord, upperCoord );=
=0A>=0A>=0A>=0A>         mapPane.setMapArea( envelope );=0A>=0A>=0A>       =
  mapPane.repaint();=0A>=0A>=0A> ----=0A>=0A> Thank you for your help in ad=
vance.=0A>=0A>=0A>=0A> - Jong=0A>=0A>=0A>=0A>=0A>   =0A=0A=0A=0A