A bar graph problem

Question

hi all,
sorry if my question is not clear, try my best to describe.
i currently creating a bar graph applet, where this applet take different "group" of data / value, e.g. (68, 268,2680, 28 and 8). and here the maximum value is 2680, other group may NOT so. so for being the bar graph display, i have an applet that has a "fixed" maximum width of 700, i need my bar graph to have only 10 columns and also i need to minus out 10 from each column for other purposes, so i take (700 / 10) - 10 = 60, but here come the real problem, if i take 268 * 60 = 16080, that is incorrect! That is i know that i had to divide the 700 with 1000, because (700 / 1000) - (10 / 1000) = 0.69, then 268 * 0.69 = 184.92, that seem OK! but, but it still ran out of the expected result, the bar width will be much more shorter than expected (only those higher data value), why? my code will be as follow:
   if (highestWidth >= 1001)
      maxDetector = 10000;
   else if (highestWidth >= 101)
       maxDetector = 1000;
   else if (highestWidth >= 11)
       maxDetector = 100;
   else
       maxDetector = 10;
   maxSingleWidth = (axisPanel.getWidth() / maxDetector) - (10 / (maxDetector / 10));so, at for loop:
for (i=0; i <= 9; i++){
   barPanel.setBounds(x, y, (dataValue * maxSingleWidth), height);
any help will be very very much appreciated!!!

Answer 1

import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.text.NumberFormat;
import javax.swing.*;
public class BarGraph
    public BarGraph()
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new BarGraphPanel());
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    public static void main(String[] args)
        new BarGraph();
class BarGraphPanel extends JPanel
    int[] data;
    int maxValue;
    Font font;
    NumberFormat nf;
    final int PAD = 40;
    public BarGraphPanel()
        data = new int[] { 75, 12, 23, 44, 98, 32, 53, 6 };
        font = new Font("lucida sans demibold", Font.PLAIN, 15);  // j2se 1.3+
        nf = NumberFormat.getNumberInstance();
        nf.setMaximumFractionDigits(1);
    protected void paintComponent(Graphics g)
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        double w = getWidth();
        double h = getHeight();
        // ordinate
        g2.draw(new Line2D.Double(PAD, PAD, PAD, h - PAD));
        // ordinate labels
        String[] labels = getLabels();
        float labelScale = (float)(h - 2*PAD)/(labels.length - 1);
        g2.setFont(font);
        FontRenderContext frc = g2.getFontRenderContext();
        for(int j = 0; j < labels.length; j++)
            float width = (float)font.getStringBounds(labels[j], frc).getWidth();
            float height = font.getLineMetrics(labels[j], frc).getAscent();
            float x = (PAD - width)/2;
            float y = (float)(PAD + j*labelScale + height/2);
            g2.drawString(labels[j], x, y);
        // abcissa
        g2.draw(new Line2D.Double(PAD, h - PAD, w - PAD, h - PAD));
        // plot data
        g2.setPaint(Color.red);
        double xInc = (w - 2*PAD) / data.length;
        double yScale = getValueScale(h);
        double x1, y1, x2, y2;
        for(int j = 0; j < data.length; j++)
            x1 = PAD + j * xInc;
            y1 = h - PAD;
            x2 = x1 + xInc;
            y2 = y1 - data[j] * yScale;
            g2.draw(new Line2D.Double(x1, y1, x1, y2));    // left vertical
            g2.draw(new Line2D.Double(x1, y2, x2, y2));    // top of bar
            g2.draw(new Line2D.Double(x2, y2, x2, y1));    // right vertical
    private double getValueScale(double h)
        int max = getMaxValue();
        return (h - 2*PAD) / max;
    private int getMaxValue()
        int max = Integer.MIN_VALUE;
        for(int j = 0; j < data.length; j++)
            if(data[j] > max)
                max = data[j];
        return max;
    private String[] getLabels()
        int max = getMaxValue();
        double inc = max/3d;
        double next = max;
        String[] s = new String[4];
        for(int j = 0; j < 4; j++)
            s[j] = nf.format(next - j * inc);
        return s;
}