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ImageConstructor.java

/*
 * Created on 19.11.2005
 *
 */
package rene.zirkel.constructors;

import java.awt.event.MouseEvent;
import rene.util.xml.XmlTag;
import rene.util.xml.XmlTree;
import rene.zirkel.Zirkel;
import rene.zirkel.ZirkelCanvas;
import rene.zirkel.construction.Construction;
import rene.zirkel.construction.ConstructionException;
import rene.zirkel.objects.ConstructionObject;
import rene.zirkel.objects.ImageObject;
import rene.zirkel.objects.PointObject;

public class ImageConstructor extends ObjectConstructor
{     PointObject P[];
      int NPoints;
      
      public void mousePressed (MouseEvent e, ZirkelCanvas zc)
      {     if (!zc.Visual) return;
            PointObject p=zc.selectCreatePoint(e.getX(),e.getY());
            if (p!=null)
            {     P[NPoints++]=p;
                  p.setSelected(true);
                  zc.repaint();
            }
            showStatus(zc);
            if (NPoints==3)
            {     String filename=zc.loadImage();
                  if (filename.equals(""))
                  {     reset(zc);
                        return;
                  }
                  ImageObject o=new ImageObject(zc.getConstruction(),P,filename);
                  zc.addObject(o);
                  zc.clearSelected();
                  reset(zc);
                  zc.repaint();
            }
      }

      public void showStatus (ZirkelCanvas zc)
      {     if (NPoints<=1) zc.showStatus(ConstructionObject.text1(
                  Zirkel.name("message.image"),""+(NPoints+1)));
            else zc.showStatus(Zirkel.name("message.image.last"));
      }
      
      public void reset (ZirkelCanvas zc)
      {     super.reset(zc);
            if (zc.Visual)
            {     P=new PointObject[3]; NPoints=0;
                  showStatus(zc);
            }
            else
            {     zc.setPrompt(Zirkel.name("prompt.image"));
            }
      }

      public boolean construct (XmlTree tree, Construction c)
            throws ConstructionException
      {     if (!testTree(tree,"Image")) return false;
            XmlTag tag=tree.getTag();
            for (int i=0; i<3; i++)
                  if (!tag.hasParam("point"+(i+1)))
                        throw new ConstructionException("Image points missing!");
            if (!tag.hasParam("filename"))
                  throw new ConstructionException("Image filename missing!");
            try
            {     PointObject P[]=new PointObject[3];
                  for (int i=0; i<3; i++)
                        P[i]=(PointObject)c.find(tag.getValue("point"+(i+1))); 
                  String filename=tag.getValue("filename");
                  ImageObject p=new ImageObject(c,P,filename);
                  setName(tag,p);
                  set(tree,p);
                  c.add(p);
                  setConditionals(tree,c,p);
            }
            catch (ConstructionException e)
            {     throw e;
            }
            catch (Exception e)
            {     throw new ConstructionException("Image points illegal!");
            }
            return true;
      }

      public String getPrompt ()
      {     return Zirkel.name("prompt.image");
      }

      public String getTag () { return "Image"; }

      public void construct (Construction c, 
            String name, String params[], int nparams)
            throws ConstructionException
      {     
      }

}


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