Construct a GridEdit 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))], and a DisplayImpl. The grid or grids must all have the same domain Set, which must be a Gridded2DSet or a GriddedSet with domain dimension = 2. The domain must be mapped to two spatial DisplayRealTypes. If a sequence of grids, the sequence domain must be mapped to Animation. The grid may have any number of range RealTypes. The GridEdit object operates in a sequence: 1. Invokes its start() method to start. 2. User drags grid warp motion lines with the right mouse button. These lines must lie inside the grid. 3. If user presses SHIFT while dragging a grid warp motion line, the program prompts for increments for values at the dragged location. 4. User can delete lines by clicking the right button on their end points, with CTRL pressed. 5. At any point after start(), the application can invoke stop() to stop the dragging process, and warp the grid. 6. After the grid has been warped, the application can invoke undo() to undo the paste and stop the process. 7. The process can be restarted by invoking start(), any number of times. The main() method illustrates a simple GUI and test case with a sequnece of grids. Run 'java visad.bom.GridEdit' to test with contour values, and run 'java visad.bom.GridEdit 1' to test with color values. */ public class GridEdit extends Object implements ActionListener { private boolean debug = false; private Field grids = null; private DisplayImpl display = null; 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 GriddedSet xyset = null; // (x, y) domain Set FunctionType grid_type; FlatField replacedff = null; FlatField savedff = null; AnimationControl acontrol = null; ScalarMap tmap = null; ScalarMap xmap = null; ScalarMap ymap = null; DisplayTupleType xtuple = null; DisplayTupleType ytuple = null; private CellImpl cell_rbl = null; private DataReferenceImpl ref_rbl = null; private RubberBandLineRendererJ3D rblr = null; private final static int NPICKS = 50; private int npicks = 0; private PickCell[] cell_picks = null; private DataReferenceImpl[] ref_picks = null; private PickManipulationRendererJ3D[] rend_picks = null; private float[][] delta_picks = null; private GridEdit thiscp = null; private int renderer_mask; private int dialog_mask; /**

     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 GriddedSet
     3. if (t -> ...), then t is mapped to Animation