An example of stepwise color tables with VisAD

SolidColors.java

//
// SolidColors.java
//

// An example of stepwise color tables with VisAD.

import java.awt.Color;
import java.awt.Component;

import java.rmi.RemoteException;

import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JSplitPane;

import visad.*;

import visad.util.ColorMapWidget;
import visad.util.LabeledColorWidget;

import visad.java3d.DisplayImplJ3D;

public class SolidColors {

  public SolidColors()
    throws RemoteException, VisADException
  {
    DisplayImpl dpy = setupDisplay();
    setupData(dpy);
    setupColorTable(dpy);
    setupUI(dpy);
  }

  DisplayImpl setupDisplay()
    throws RemoteException, VisADException
  {
    return new DisplayImplJ3D("display");
  }

  void setupData(LocalDisplay dpy)
    throws RemoteException, VisADException
  {
    RealType[] types = {RealType.Latitude, RealType.Longitude};
    RealTupleType earth_location = new RealTupleType(types);
    RealType vis_radiance = RealType.getRealType("vis_radiance");
    RealType ir_radiance = RealType.getRealType("ir_radiance");
    RealType[] types2 = {vis_radiance, ir_radiance};
    RealTupleType radiance = new RealTupleType(types2);
    FunctionType image_tuple = new FunctionType(earth_location, radiance);

    int size = 32;
    FlatField imaget1 = FlatField.makeField(image_tuple, size, false);

    dpy.addMap(new ScalarMap(RealType.Latitude, Display.YAxis));
    dpy.addMap(new ScalarMap(RealType.Longitude, Display.XAxis));
    dpy.addMap(new ScalarMap(vis_radiance, Display.ZAxis));

    dpy.addMap(new ScalarMap(ir_radiance, Display.RGB));

    GraphicsModeControl mode = dpy.getGraphicsModeControl();
    mode.setTextureEnable(false);

    DataReferenceImpl ref_imaget1 = new DataReferenceImpl("ref_imaget1");
    ref_imaget1.setData(imaget1);
    dpy.addReference(ref_imaget1, null);
  }

  void setupColorTable(LocalDisplay dpy)
    throws RemoteException, VisADException
  {
    ScalarMap colorMap = (ScalarMap) dpy.getMapVector().lastElement();
    ColorControl control = (ColorControl) colorMap.getControl();

    float[][] lut = new float[3][256];
    Color[] colors = {
      Color.red, Color.blue, Color.green, Color.yellow, Color.magenta
    };
    int index = 0;
    for (int c=0; c<colors.length; c++) {
      int minIndex = c * 256 / colors.length;
      int maxIndex = (c + 1) * 256 / colors.length;
      for (int i=minIndex; i<maxIndex; i++) {
        lut[0][i] = colors[c].getRed() / 255f;
        lut[1][i] = colors[c].getGreen() / 255f;
        lut[2][i] = colors[c].getBlue() / 255f;
      }
    }
    control.setTable(lut);
  }

  void setupUI(LocalDisplay dpy)
    throws RemoteException, VisADException
  {
    ScalarMap colorMap = (ScalarMap) dpy.getMapVector().lastElement();
    LabeledColorWidget widget =
      new LabeledColorWidget(new ColorMapWidget(colorMap, false));

    JFrame frame = new JFrame("Solid Colors Example");

    JSplitPane pane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
    frame.setContentPane(pane);

    pane.add(dpy.getComponent());
    pane.add(widget);

    frame.pack();
    pane.setDividerLocation(0.70);
    frame.setVisible(true);
  }

  public static void main(String[] args)
    throws RemoteException, VisADException
  {
    new SolidColors();
  }
}