secondo/Javagui/viewer/hoese/algebras/Dsplupoint.java

//This file is part of SECONDO.

//Copyright (C) 2004, University in Hagen, Department of Computer Science, 
//Database Systems for New Applications.

//SECONDO is free software; you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation; either version 2 of the License, or
//(at your option) any later version.

//SECONDO is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//GNU General Public License for more details.

//You should have received a copy of the GNU General Public License
//along with SECONDO; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

package  viewer.hoese.algebras;

import java.awt.geom.*;
import java.awt.*;
import viewer.*;
import viewer.hoese.*;
import sj.lang.ListExpr;
import gui.Environment;
import javax.swing.JPanel;
import tools.Reporter;


/**
 * A displayclass for a single unit of the moving point type
 */
public class Dsplupoint extends DisplayTimeGraph {
  
  private double x1,x2,y1,y2;
  private Point2D.Double point;
  private Rectangle2D.Double bounds=null;
  private Interval theInterval;
  private static JPanel EmptyPanel = new JPanel();
  private RectangularShape shp;

  private static Point2D.Double aPoint = new Point2D.Double();

  public boolean isPointType(int num){
     return true;
  }


  public int numberOfShapes(){
      return 1;
  }

  /** Computes the Renderobject at the given point in time */
  public Shape getRenderObject (int num,AffineTransform at) {
    if(num!=0) {
       return null;
    }
    double t = RefLayer.getActualTime(); // get the current time
    if(!theInterval.isDefinedAt(t)){ // t is outside from the deftime
       point = null;
       return null;
    }
    double t1 = theInterval.getStart();
    double t2 = theInterval.getEnd();
    double Delta = (t-t1)/(t2-t1);
    double x = x1+Delta*(x2-x1);
    double y = y1+Delta*(y2-y1);

    if(!ProjectionManager.project(x,y,aPoint)){
       aPoint.setLocation(x,y);
    }


    double ps = Cat.getPointSize(renderAttribute,CurrentState.ActualTime);
    double pixy = Math.abs(ps/at.getScaleY());
    //double pix = Cat.getPointSize();
    double pix = Math.abs(ps/at.getScaleX());
    //Point2D p=at.transform(point,p);
    if (Cat.getPointasRect())
      shp = new Rectangle2D.Double(aPoint.getX()- pix/2, aPoint.getY() - pixy/2, pix, pixy);
    else {
      shp = new Ellipse2D.Double(aPoint.getX()- pix/2, aPoint.getY() - pixy/2, pix, pixy);
    }
    return  shp;
  }


  /**
   * Scans the representation of a upoint datatype
   * @param v interval with x1,x2,y1,y2 values
   * @see sj.lang.ListExpr
   */
  private void ScanValue (ListExpr v) {
    err = true;
    if (v.isEmpty())
      return;
    if(v.listLength()!=2) // list must have the form ((interval)(x1 y1 x2 y2))
       return; 

    theInterval = LEUtils.readInterval(v.first());
    if(theInterval==null) // error in reading interval
       return;  

    ListExpr StartEnd = v.second();
    if(StartEnd.listLength()!=4) // error in reading start and end point
       return; 
    Double X1 = LEUtils.readNumeric(StartEnd.first());
    Double Y1 = LEUtils.readNumeric(StartEnd.second());
    Double X2 = LEUtils.readNumeric(StartEnd.third());
    Double Y2 = LEUtils.readNumeric(StartEnd.fourth());
    if(X1==null || X2==null | Y1==null || Y2==null) // error in reading x,y values
        return;
    x1 = X1.doubleValue();
    x2 = X2.doubleValue();
    y1 = Y1.doubleValue();
    y2 = Y2.doubleValue();

    err = false;
    if(bounds==null)
      bounds = new Rectangle2D.Double(0,0,0,0);

    Point2D.Double p1 = new Point2D.Double();
    Point2D.Double p2 = new Point2D.Double();
    if(ProjectionManager.project(x1,y1,p1) &&
       ProjectionManager.project(x2,y2,p2)){
       x1 = p1.getX();
       x2 = p2.getX();
       y1 = p1.getY();
       y2 = p2.getY();
    } 

    bounds.setRect(Math.min(x1,x2),Math.min(y1,y2),Math.abs(x1-x2),Math.abs(y1-y2));
   
    if(!theInterval.isInfinite()){ 
        TimeBounds = theInterval;
    } else{
        TimeBounds = null;
    }
  }


  public void init (String name, int nameWidth, int indent, ListExpr type, ListExpr value, QueryResult qr) {
    AttrName = extendString(name, nameWidth, indent);
    ScanValue(value);
    if (err) {
      Reporter.writeError("Dsplmovingpoint Error in ListExpr :parsing aborted");
      qr.addEntry(new String("(" + AttrName + ": GTA(mpoint))"));
      return;
    }
    else
      qr.addEntry(this);
    //ListIterator li=iv.listIterator();
  }

  /* Returns an empty JPanel at this time */
  public JPanel getTimeRenderer(double d){
     return EmptyPanel;
  } 


/** returns true if the last computet position is in the near of xpos,ypos */
public boolean contains (double xpos, double ypos, double scalex, double scaley) {
    if(point==null) return false; // no last position
    double x = point.getX();
    double y = point.getY();
    return (Math.abs(x-xpos)<scalex*10) && (Math.abs(y-ypos)<scaley*10);
}




  /**
   * @return The overall boundingbox of the upoint
   * @see <a href="Dsplmovingpointsrc.html#getBounds">Source</a>
   */
  public Rectangle2D.Double getBounds () {
    return  bounds;
  }

}