stuck with problem!

Posted by sridevi polavaram on Oct 03, 2006; 8:45pm
URL: http://imagej.273.s1.nabble.com/stuck-with-problem-tp3701413.html

Dear List,
 This is the first time i am posing in this forum. I am trying to develop a
simple plugin that allows user to
(a) draw lines interactively and saves the xy points in a file,
(b) display lines by reading from files.
I am reusing some of neuron_morpho code and also the imagej API and source
code is itself very helpful.
But I am having a strange problem when i am trying to display lines by
reading from the input file, here is the code snippet:

public void actionPerformed(ActionEvent e) {
    String label = e.getActionCommand();
    if (label==null)
        return;
    img = WindowManager.getCurrentImage();
    if (img==null) {
        IJ.beep();
        IJ.showStatus("No image");
        return;
    }
//here i am trying to read a file and display it on the image window. img is
an object of ImagePlus class. the input file contains x-coord and y-coord
seperated by a space in each line
    if(label=="Open"){
        IJ.showStatus("entered Open");
        String line[] = new String[4];
        JFileChooser chooser = new JFileChooser(morphoFile);
        if ( morphoFile.isFile() ) {
        chooser.setSelectedFile(morphoFile);
        }
        int result = chooser.showOpenDialog(frame);
        if (result == JFileChooser.CANCEL_OPTION) return;
        morphoFile = chooser.getSelectedFile();
        try {
        FileReader readIn = new FileReader(morphoFile);
        BufferedReader in = new BufferedReader(readIn);
        String inLine;
        String fLine="";
        int linectr=0;
        int ctr=0;
        //ControlPanel cp = new ControlPanel();
        //NewImage nimg = new NewImage();
        //ImagePlus imp =  nimg.createRGBImage("Draw a Line",400,400,0,0);
        //int[] xy = new int[4];
         //IJ.showStatus("reading file"+morphoFile.getName()+"
"+morphoFile.exists());
//here i am reading 2 lines at a time so that i get two endpoints to draw a
line
        while ((inLine = in.readLine()) != null & linectr <= 1) {
            fLine = fLine + " " + inLine;

            ++linectr;

            if(linectr > 1){

            StringTokenizer st = new StringTokenizer(fLine);
            while(st.hasMoreTokens()){
                 line[ctr++] = st.nextToken();
            }
  //this line is printed just fine!
            //IJ.showStatus(line[0]+" "+line[1]+" "+line[2]+" "+line[3]);
            canvas.setImageUpdated();

            //int[] xy = cp.s2ints(fLine);
//the problem is here. this is a simple routine that converts String to int
using Integer.parseInt(s). But any showStatus messages that i try to print
after calling this routin doesn't show at all!!
            int[] xy = transfer(line);
//none of these prints work!
            IJ.showStatus("len:"+xy.length);
            //IJ.showMessage(xy[0]+" "+xy[1]+" "+xy[2]+" "+xy[3]);
            //IJ.showMessage("pnt:"+x_1+" "+y_1);
            //Line ln = new Line(canvas.offScreenX(xy[0]),canvas.offScreenY
(xy[1]),canvas.offScreenX(xy[2]),canvas.offScreenY(xy[3]));
            //imp.setRoi(ln);
//These two lines should hopefully draw a line! am i right? but i don't get
anything displayed on the image window!
            img.getProcessor().moveTo(canvas.offScreenX(xy[0]),
canvas.offScreenY(xy[1]));
            img.getProcessor().lineTo(canvas.offScreenX(xy[2]),
canvas.offScreenY(xy[3]));

            //imp.drawLine(x_1,y_1,x_2,y_2);
            //img.setProcessor("Draw A Line",imp);
            img.updateAndRepaintWindow();
            linectr=0;
            ctr=0;
            }

        }
        }catch(Exception ex){IJ.showStatus(ex.getMessage());}//nothing is
shown here as exception

    }
// small routine that converts string to int
 int[] transfer(String[] line){
        int[] xycoord = new int[4];
        try{
// I can see this line
            // IJ.showStatus(line[0]+" "+line[1]+" "+line[2]+"
"+line[3]);
            int int0 = Integer.parseInt(line[0].trim());
// But not this line. for some reason as soon as i use parseInt i don't see
any messages on the panel!! why?
            IJ.showMessage("int:"+int0);
            xycoord[0] =int0;
            xycoord[1] = Integer.parseInt(line[1].trim());
            xycoord[2] =Integer.parseInt(line[2].trim());
            xycoord[3] =Integer.parseInt(line[3].trim());
              IJ.showStatus(xycoord[0]+" "+xycoord[1]+" "+xycoord[2]+"
"+xycoord[3]);
              /*
            xycoord[0] =  canvas.offScreenX(x_1);
            xycoord[1] = canvas.offScreenY(y_1);
            xycoord[2] = canvas.offScreenX(x_2);
            xycoord[3] = canvas.offScreenY(y_2);
            */
        }catch(NumberFormatException nfe){IJ.showMessage("entered
exc");IJ.showMessage(nfe.getMessage());}
         return  xycoord;
    }

I would really appreciate if any of you can throw some light on this! I just
have no clue what i should do
-Thanks a lot
Sridevi.