Re: shapes

• To: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>
• Subject: Re: shapes
• From: Tom Whittaker <tomw@xxxxxxxxxxxxx>
• Date: Thu, 30 Aug 2001 13:48:17 -0500

Here is a small example that I used when training in Australia which
illustrates what Bill wrote.  Hope you find it helpful...

tom



// import needed classes
import visad.*;
import visad.java2d.DisplayImplJ2D;
import visad.java2d.DirectManipulationRendererJ2D;
import java.rmi.RemoteException;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ShapeTest {

  // type 'java ShapeTest' to run this application
  public static void main(String args[])
         throws VisADException, RemoteException {

    final RealType x = new RealType("x");
    final RealType y = new RealType("y");
    final RealType shape = new RealType("shape");

    DisplayImpl disp = new DisplayImplJ2D("display");

    ScalarMap sx = new ScalarMap(x, Display.XAxis);
    sx.setRange(-1.0, 1.0);
    disp.addMap(sx);

    ScalarMap sy = new ScalarMap(y, Display.YAxis);
    sy.setRange(-1.0, 1.0);
    disp.addMap(sy);

    ScalarMap shape_map = new ScalarMap(shape, Display.Shape);
    disp.addMap(shape_map);

    final RealTupleType coord_type = new RealTupleType(x, y, shape);
    RealTuple coord_tuple = 
             new RealTuple(coord_type, new double[] {0.7, -0.3, 0});
    RealTuple coord_tuple2 = 
             new RealTuple(coord_type, new double[] {-0.7, 0.3, 1});

    // make some shapes..
    VisADLineArray cross = new VisADLineArray();
    cross.coordinates = new float[]
      {0.2f,  0.2f, 0.0f,    -0.2f, -0.2f, 0.0f,
       0.2f, -0.2f, 0.0f,    -0.2f,  0.2f, 0.0f};
    cross.vertexCount = cross.coordinates.length / 3;

    double[] start = {0.0, 0.0, 0.0}; // text at origin
    double[] base = {0.1, 0.0, 0.0};  // text out along XAxis
    double[] up = {0.0, 0.1, 0.0};    // character up along YAxis
    boolean center = true;            // center text

    VisADLineArray tom = PlotText.render_label("Tom", start, base, up, center);

    VisADGeometryArray[] shapes = new VisADGeometryArray[] {cross, tom};

    ShapeControl shape_control = (ShapeControl) shape_map.getControl();
    shape_control.setShapeSet(new Integer1DSet(2));
    shape_control.setShapes(shapes);

    // now attach to the display

    DataReferenceImpl ref_coord_tuple = new DataReferenceImpl("ref_c_t");
    ref_coord_tuple.setData(coord_tuple);
    
    DataReferenceImpl ref_coord_tuple2 = new DataReferenceImpl("ref_c_t2");
    ref_coord_tuple2.setData(coord_tuple2);

    ConstantMap[] yellow = new ConstantMap[] {
      new ConstantMap(1., Display.Red),
      new ConstantMap(1., Display.Green),
      new ConstantMap(0., Display.Blue),
    };
    ConstantMap[] cyan  = new ConstantMap[] {
      new ConstantMap(0., Display.Red),
      new ConstantMap(1., Display.Green),
      new ConstantMap(1., Display.Blue),
    };


    // for simple dipslay, use
    //disp.addReference(ref_coord_tuple);
    //disp.addReference(ref_coord_tuple2);


// ...or...for interactive display, use
    disp.addReferences(new DirectManipulationRendererJ2D(), ref_coord_tuple,
cyan);
    disp.addReferences(new DirectManipulationRendererJ2D(), ref_coord_tuple2,
yellow);

    // to list out the values at the cursor
    final DisplayRenderer dr = disp.getDisplayRenderer();

    CellImpl cell = new CellImpl() {
      public void doAction() throws VisADException {
        double xcoord = dr.getDirectAxisValue(x);
        double ycoord = dr.getDirectAxisValue(y);
        System.out.println("x,y ="+xcoord+"  "+ycoord);
      }
    };
    cell.addReference(ref_coord_tuple);
    cell.addReference(ref_coord_tuple2);
// end of list out values addition...


    JFrame frame = new JFrame("Dot Application");
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {System.exit(0);}
    });

    // create JPanel in JFrame
    JPanel panel = new JPanel();
    frame.getContentPane().add(disp.getComponent());

    // set size of JFrame and make it visible
    frame.setSize(300, 300);
    frame.setVisible(true);
  }
}



-- 
Tom Whittaker (tomw@xxxxxxxxxxxxx)
University of Wisconsin-Madison
Space Science and Engineering Center
Phone/VoiceMail: 608/262-2759
Fax: 608/262-5974

• References:
  • shapes
    • From: Igor
  • Re: shapes
    • From: Bill Hibbard