MacWorld 1998 May/Macworld (1998-05).dmg/Shareware World/Comms & Internet/ImageMapper v3.0/Goodies/Java/HighlightedImageMap(Original)/HighlightedImageMap.java

Text File | 1996-10-10 | 6KB | 246 lines

import java.applet.*;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.net.*;

public class HighlightedImageMap extends Applet
{

Image                 normalimg;
Image                 highlightedimg=null;

public boolean        nloaded=false;
public boolean        hloaded=false;

boolean             debug=false;

public void start()
{
    //Check if the images are already loaded. (Cache fix)
    if ((checkImage(normalimg,this) & ImageObserver.ALLBITS)==ImageObserver.ALLBITS)
    {
        nloaded=true;
    }

    if ((checkImage(highlightedimg,this) & ImageObserver.ALLBITS)==ImageObserver.ALLBITS)
    {
        hloaded=true;
    }

    //Paint it!
    repaint();
}

public void init()
{
    //Applet name
    System.out.println("HighlightedImageMap v1.11\nRickard ÷berg([e-mail]) 1996");

    //Show "Loading"
    repaint();

    //Show debug(X/Y) info?
    debug=(getParameter("debug")==null)?false:true;

    //Target frame name. If null then same frame is target
    //Either one target for every link, or one for each link

    String target=getParameter("target");
    if (target==null)
        target="";

    boolean individualtargets=false; //If true, each link has it's own target frame/window
    StringBufferInputStream tsbis=new StringBufferInputStream(target);
    StreamTokenizer         tst=new StreamTokenizer(tsbis);

    if (target.indexOf(',')!=-1)
        individualtargets=true; //Individual link targets

    //Get images
    URL hosturl=getDocumentBase();
    URL normalurl;
    URL highlightedurl;

    try
    {
        normalurl=new URL(hosturl,getParameter("normal"));
        highlightedurl=new URL(hosturl,getParameter("highlight"));
    }
    catch(Exception e)
    {
        System.out.println("Error: 'normal' or 'highlight' not valid");
        return;
    }

       normalimg=getImage(normalurl);
    highlightedimg=getImage(highlightedurl);
    prepareImage(normalimg,this);
    prepareImage(highlightedimg,this);

    //Get rid of the layout manager: WE DON'T WANT IT!
    setLayout(null);

    /*
     *
     * Parse links
     *
     */

    String links=getParameter("links");

    //No links, no imagemap
    if (links==null)
    {
        System.out.println("Error: no links specified");
        return;
    }

    StringBufferInputStream sbis=new StringBufferInputStream(links);
    StreamTokenizer         st=new StreamTokenizer(sbis);
    st.quoteChar(39);

    //Syntax {ulx,uly,lrx,lry,"URL"}
    int x,y,w,h;
    URL url; //Link URL
    String alt;
    boolean done=false; //Done parsing links?

    try
        do
        {
            //Default alternative text
            alt="";

            if (st.nextToken()!='{') throw new Exception("{ expected");

            //Upper left x
            if (st.nextToken()!=StreamTokenizer.TT_NUMBER) throw new Exception("number expected");
            x=(int)st.nval;

           // ','
           if (st.nextToken()!=',') throw new Exception("',' expected");

           //Upper left y
           if (st.nextToken()!=StreamTokenizer.TT_NUMBER) throw new Exception("number expected");
           y=(int)st.nval;

           // ','
           if (st.nextToken()!=',') throw new Exception("',' expected");

           //Lower right x
           if (st.nextToken()!=StreamTokenizer.TT_NUMBER) throw new Exception("number expected");
           w=(int)st.nval-x;

           // ','
           if (st.nextToken()!=',') throw new Exception("',' expected");

           //Lower right y
           if (st.nextToken()!=StreamTokenizer.TT_NUMBER) throw new Exception("number expected");
           h=(int)st.nval-y;

           // ','
           if (st.nextToken()!=',') throw new Exception("',' expected");

           //URL
           if (st.nextToken()!=39) throw new Exception("quoted url expected(use ' for quotation)");
           url=new URL(getDocumentBase(),st.sval);

           //Optional alternative text
           if (st.nextToken()==',')
           {
               if (st.nextToken()==39)
                   alt=st.sval;
               else
                   throw new Exception("alternative linktext expected");
           }
           else
               st.pushBack();

           if (st.nextToken()!='}') throw new Exception("} expected");

           //Get target name
           String linktarget; //Target for this particular link
           if (individualtargets)
           {
               tst.nextToken();
               linktarget=tst.sval;
               tst.nextToken();
           }
           else
               linktarget=target; //Use global target

           //Create images for link
           ImageFilter cropfilter = new CropImageFilter(x,y,w,h);
           Image nimg = createImage(new FilteredImageSource(normalimg.getSource(),
                                    cropfilter));

           Image hlimg = createImage(new FilteredImageSource(highlightedimg.getSource(),
                                     cropfilter));

           //Add link
           add(new HighlightableLink(x,y,w,h,nimg,hlimg,url,alt,linktarget,this));

           //Check if end of links
           if (st.nextToken()==StreamTokenizer.TT_EOF)
               done=true;

           st.pushBack();

        } while(!done);
    catch(Exception e)
    {
        System.out.println("Error in links parameter:");
        System.out.println(e);
    }
}

public void paint(Graphics g)
{
    if (nloaded && hloaded)
    {
        g.drawImage(normalimg,0,0,this);
    }
    else
        g.drawString("Loading",0,10);

    paintComponents(g);
}

public void update(Graphics g)
{
    paint(g);
}

public boolean imageUpdate(Image  img, int  infoflags,
            int  x, int  y, int  width, int  height)
{
    if (img==normalimg && (infoflags & ImageObserver.ALLBITS)==ImageObserver.ALLBITS)
    {
        nloaded=true;
    }

    if (img==highlightedimg && (infoflags & ImageObserver.ALLBITS)==ImageObserver.ALLBITS)
    {
        hloaded=true;
    }

    if (nloaded && hloaded)
        repaint();

    return !(hloaded && nloaded);
}

public boolean mouseMove(Event evt, int x, int y)
{
    //Show debug(X/Y) info
    if (debug)
    {
        showStatus("X: "+x+" Y: "+y);
        return true;
    }

    return false;
}

}