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RayConstructor.java

package rene.zirkel.constructors;

// file: RayConstructor.java

import rene.util.xml.XmlTag;
import rene.util.xml.XmlTree;
import rene.zirkel.*;
import rene.zirkel.construction.*;
import rene.zirkel.objects.*;

public class RayConstructor extends LineConstructor
{     public ConstructionObject create (Construction c, PointObject p1, PointObject p2)
      {     return new RayObject(c,p1,p2);
      }
      public void showStatus (ZirkelCanvas zc)
      {     if (P1==null) zc.showStatus(
                  Zirkel.name("message.ray.first","Ray: Set the root point!"));
            else zc.showStatus(
                  Zirkel.name("message.ray.second","Ray: Set the second point!"));
      }
      public boolean construct (XmlTree tree, Construction c)
            throws ConstructionException
      {     if (!testTree(tree,"Ray")) return false;
            XmlTag tag=tree.getTag();
            if (!tag.hasParam("from") || !tag.hasParam("to"))
                  throw new ConstructionException("Ray points missing!");
            try
            {     PointObject p1=(PointObject)c.find(tag.getValue("from")); 
                  PointObject p2=(PointObject)c.find(tag.getValue("to"));
                  RayObject o=new RayObject(c,p1,p2);
                  if (tag.hasParam("partial")) o.setPartial(true);
                  setName(tag,o);
                  set(tree,o);
                  c.add(o);
                  setConditionals(tree,c,o);
            }
            catch (ConstructionException e)
            {     throw e;
            }
            catch (Exception e)
            {     e.printStackTrace();
                  throw new ConstructionException("Ray points illegal!");
            }
            return true;
      }
      
      public String getPrompt ()
      {     return Zirkel.name("prompt.ray");
      }
      
      public String getTag () { return "Ray"; }
      public void construct (Construction c, 
            String name, String params[], int nparams)
            throws ConstructionException
      {     if (nparams!=2)
                  throw new ConstructionException(Zirkel.name("exception.nparams"));
            ConstructionObject
                  P1=c.find(params[0]);
            if (P1==null)
                  throw new ConstructionException(Zirkel.name("exception.notfound")+" "+
                        params[0]);
            ConstructionObject
                  P2=c.find(params[1]);
            if (P2==null)
                  throw new ConstructionException(Zirkel.name("exception.notfound")+" "+
                        params[1]);
            if (!(P1 instanceof PointObject))
                  throw new ConstructionException(Zirkel.name("exception.type")+" "+
                        params[0]);
            if (!(P2 instanceof PointObject))
                  throw new ConstructionException(Zirkel.name("exception.type")+" "+
                        params[1]);
            RayObject s=new RayObject(c,(PointObject)P1,(PointObject)P2);
            c.add(s);
            s.setDefaults();
            if (!name.equals("")) s.setNameCheck(name);
      }

}

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