Construct a CutAndPasteFields object linked to a 2-D grid [a FlatField with MathType ((x, y) -> range)]) or a sequence of 2-D grids {a FieldImpl with MathType (t -> ((x, y) -> range))], a DisplayImpl, and an optional integer blend region width. The grid or grids must all have the same Linear domain Set (Linear2DSet or LinearNDSet with domain dimension = 2), and the domain must be mapped to two of XAxis, YAxis and ZAxis. If a sequence of grids, the sequence domain must be mapped to Animation. The grid may have any number of range RealTypes. The CutAndPasteFields object operates in a sequence: 1. Invokes its start() method to start. 2. User drags a grid sector rectangle with the right mouse button. This rectangle must lie inside the grid. 3. When the user releases, the rectangle appears fixed over the grid. 4. The user can change to a different time step, and drag the rectangle by one of its corners. On release, it must lie inside the grid. 5. The source grid sector is pasted into the destination, within blending over a certain width near the destination border. 6. The user can change time step or drag the rectangle any number of times: each time the previous paste is undone and the source grid sector is pasted into the new time and location. 7. At any point after start(), the application can invoke stop() to stop the process. 8. After a source rectangle has been pasted, the application can invoke undo() to undo the paste and stop the process. 9. The process can be restarted by invoking start(), any number of times. 10. At any point, the application can invoke setBlend() to change the width of the blend region. The main() method illustrates a simple GUI and test case with a sequnece of grids. Run 'java visad.bom.CutAndPasteFields' to test with contour values, and run 'java visad.bom.CutAndPasteFields 1' to test with color values. */ public class CutAndPasteFields extends Object implements ActionListener { private boolean debug = false; private Field grids = null; private DisplayImpl display = null; private int blend = 0; private Object lock = new Object(); private RealType t = null; // non-null if animation private RealType x = null; private RealType y = null; private RealTupleType xy = null; private MathType range = null; // RealType or RealTupleType private int rangedim = 0; private int nts = 0; // number of steps in sequence Set tset = null; // t domain Set Set xyset = null; // (x, y) domain Set int nx, ny; // dimensions of xyset int rx, ry; // dimensions of cut rectangle float[][] cut = null; float[][] replaced = null; FlatField replacedff = null; int replacedixlow, replacedixhi; int replacediylow, replacediyhi; AnimationControl acontrol = null; ScalarMap tmap = null; ScalarMap xmap = null; ScalarMap ymap = null; private double xlow, xhi, ylow, yhi; // rect boundaries private int ixlow, ixhi, iylow, iyhi; // x and y indices private CellImpl cell_rbb = null; private CellImpl cell_xlyl = null; private CellImpl cell_xlyh = null; private CellImpl cell_xhyl = null; private CellImpl cell_xhyh = null; private DataReferenceImpl ref_rbb = null; private DataReferenceImpl ref_xlyl = null; private DataReferenceImpl ref_xlyh = null; private DataReferenceImpl ref_xhyl = null; private DataReferenceImpl ref_xhyh = null; private DataReferenceImpl ref_rect = null; private RubberBandBoxRendererJ3D rbbr = null; private BoxDragRendererJ3D xlylr = null; private BoxDragRendererJ3D xlyhr = null; private BoxDragRendererJ3D xhylr = null; private BoxDragRendererJ3D xhyhr = null; private DefaultRendererJ3D rectr = null; private CutAndPasteFields thiscp = null; public CutAndPasteFields(Field gs, DisplayImplJ3D d) throws VisADException, RemoteException { this(gs, d, 0); } /**

     gs has MathType (t -> ((x, y) -> v)) or ((x, y) -> v)
     conditions on gs and display:
     1. x and y mapped to XAxis, YAxis, ZAxis
     2. (x, y) domain LinearSet
     3. if (t -> ...), then t is mapped to Animation
     b is width of blend region