[rhivka]

Ok, I inserted the GraphPanel class and I managed to compile with no errors...yay!! But... the UI is blank when the program starts up. Is this something I did while inserting the GraphPanel? Here is what the program looks like from the "read from sequential file" section down. Could you take a look and see if I'm missing something? Or do you maybe know why it is blank already from the previous code? Thanks for your time.

Code:

    //reading from sequential file
    private void load() {
        Reader fis;
        try {
            fis = new InputStreamReader(getClass().getResourceAsStream("data.txt"));
            BufferedReader br = new BufferedReader( fis );
            termArray = new int[4];
            rateArray = new double[4];
            String line;
            int i = 0;
            while((line = br.readLine()) != null) {
                String[] s = line.split(",");
                termArray[ i ] = Integer.parseInt(s[0].trim());
                rateArray[ i ] = Double.parseDouble(s[1].trim());
                i++;
            }

            br.close();
        } catch ( Exception e1 ) {
            e1.printStackTrace(  );
        }
    }

class GraphPanel extends JPanel
{
    final int
        HPAD = 60,
        VPAD = 40;
    int[] data;
    Font font;
    float[] principalAmts;
    float[] interestAmts;

    public GraphPanel(float[] principalAmts, float[] interestAmts)
    {

        font = new Font("lucida sans regular", Font.PLAIN, 16);
        setBackground(Color.white);
    }

    protected void paintComponent(Graphics g)
       {
           super.paintComponent(g);

           Graphics2D g2 = (Graphics2D)g;
           g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                               RenderingHints.VALUE_ANTIALIAS_ON);
           g2.setFont(font);
           FontRenderContext frc = g2.getFontRenderContext();
           int w = getWidth();
           int h = getHeight();
           // scales
           float xInc = (w - HPAD - VPAD) / (interestAmts.length - 1);//11f;  //distance between each point
           float yInc = (h - 2*VPAD) / 10f;
           int[] dataVals = getDataVals();        //min and max values for y-axis
           float yScale = dataVals[2] / 10f;

           // ordinate (y - axis)
           g2.draw(new Line2D.Double(HPAD, VPAD, HPAD, h - VPAD));
           // plot tic marks
           float x1 = HPAD, y1 = VPAD, x2 = HPAD - 3, y2;
           for(int j = 0; j < 10; j++)
           {
               g2.draw(new Line2D.Double(x1, y1, x2, y1));
               y1 += yInc;
           }
           // labels
           String text; LineMetrics lm;
           float xs, ys, textWidth, height;
           for(int j = 0; j <= 10; j++)
           {
               text = String.valueOf(dataVals[1] - (int)(j * yScale));
               textWidth = (float)font.getStringBounds(text, frc).getWidth();
               lm = font.getLineMetrics(text, frc);
               height = lm.getAscent();
               xs = HPAD - textWidth - 7;
               ys = VPAD + (j * yInc) + height/2;
               g2.drawString(text, xs, ys);
                     if(j == 0) g2.drawString("Principal", xs, ys - 15);
           }

           // abcissa (x - axis)
           g2.draw(new Line2D.Double(HPAD, h - VPAD, w - VPAD, h - VPAD));
           // tic marks
           x1 = HPAD; y1 = h - VPAD; y2 = y1 + 3;
           for(int j = 0; j < interestAmts.length; j++)
           {
               g2.draw(new Line2D.Double(x1, y1, x1, y2));
               x1 += xInc;
           }
           // labels
           ys = h - VPAD;
           for(int j = 0; j < interestAmts.length; j++)
           {
               text = String.valueOf(j + 1);
               textWidth = (float)font.getStringBounds(text, frc).getWidth();
               lm = font.getLineMetrics(text, frc);
               height = lm.getHeight();
               xs = HPAD + j * xInc - textWidth/2;
               g2.drawString(text, xs, ys + height);
                     if( j == (interestAmts.length - 1)) g2.drawString("Year", (int)w /2 , ys + height + 15);
           }

           // plot data
             float yy2 = 0, yy1 = 0, xx2 = 0, xx1;
           x1 = HPAD;
             xx1 = HPAD;
           yScale = (float)(h - 2*VPAD) / dataVals[2];

           for(int j = 0; j < interestAmts.length; j++)
           {
             g.setColor(Color.blue);
             y1 = VPAD + (h - 2*VPAD) - (principalAmts[j] - dataVals[0]) * yScale;
                 g2.fillOval((int)x1, (int)y1 - 2, 5, 5);

               if(j > 0)
               g2.draw(new Line2D.Double(x1, y1, x2, y2));
               x2 = x1;
               y2 = y1;
               x1 += xInc;

             g.setColor(Color.red);
             yy1 = VPAD + (h - 2*VPAD) - (interestAmts[j] - dataVals[0]) * yScale;
                 g2.fillOval((int)xx1, (int)yy1 - 1, 5, 5);
                  if(j > 0)
               g2.draw(new Line2D.Double(xx1, yy1, xx2, yy2));
               xx2 = xx1;
               yy2 = yy1;
               xx1 += xInc;

           }
    }

    private int[] getDataVals()
    {
        int max = Integer.MIN_VALUE;
        int min = Integer.MAX_VALUE;
          int j = interestAmts.length -1;
          max = (int)principalAmts[j];
          min = (int)interestAmts[j];
        int span = max - min;
        return new int[] { min, max, span };
    }
}

    public static void main(String[] args) {
        MC smc = new MC();
    }
 }