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@nugraha16
Created February 3, 2012 00:40
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Chart Bar di java
package DemoChartBar;
import java.awt.*;
import javax.swing.*;
import com.jtattoo.plaf.mcwin.McWinLookAndFeel;
import java.awt.event.*;
/*
* @Anugrah Bagus Susilo
*/
public class SampleBarChart extends JPanel {
private double[] value;
private String[] languages;
private String title;
public SampleBarChart(double[] val, String[] lang, String t) {
languages = lang;
value = val;
title = t;
}
public void paintComponent(Graphics graphics) {
super.paintComponent(graphics);
if (value == null || value.length == 0)
return;
double minValue = 0;
double maxValue = 0;
for (int i = 0; i < value.length; i++) {
if (minValue > value[i])
minValue = value[i];
if (maxValue < value[i])
maxValue = value[i];
}
Dimension dim = getSize();
int clientWidth = dim.width;
int clientHeight = dim.height;
int barWidth = clientWidth / value.length;
Font titleFont = new Font("Book Antiqua", Font.BOLD, 15);
FontMetrics titleFontMetrics = graphics.getFontMetrics(titleFont);
Font labelFont = new Font("Book Antiqua", Font.PLAIN, 10);
FontMetrics labelFontMetrics = graphics.getFontMetrics(labelFont);
int titleWidth = titleFontMetrics.stringWidth(title);
int q = titleFontMetrics.getAscent();
int p = (clientWidth - titleWidth) / 2;
graphics.setFont(titleFont);
graphics.drawString(title, p, q);
int top = titleFontMetrics.getHeight();
int bottom = labelFontMetrics.getHeight();
if (maxValue == minValue)
return;
double scale = (clientHeight - top - bottom) / (maxValue - minValue);
q = clientHeight - labelFontMetrics.getDescent();
graphics.setFont(labelFont);
for (int j = 0; j < value.length; j++) {
int valueP = j * barWidth + 1;
int valueQ = top;
int height = (int) (value[j] * scale);
if (value[j] >= 0)
valueQ += (int) ((maxValue - value[j]) * scale);
else {
valueQ += (int) (maxValue * scale);
height = -height;
}
graphics.setColor(Color.DARK_GRAY);
graphics.fillRect(valueP, valueQ, barWidth - 2, height);
graphics.setColor(Color.black);
graphics.drawRect(valueP, valueQ, barWidth - 2, height);
int labelWidth = labelFontMetrics.stringWidth(languages[j]);
p = j * barWidth + (barWidth - labelWidth) / 2;
graphics.drawString(languages[j], p, q);
}
}
public static void main(String[] args) throws UnsupportedLookAndFeelException {
UIManager.setLookAndFeel(new McWinLookAndFeel());
JFrame frame = new JFrame();
frame.setSize(350, 300);
double[] value= new double[5];
String[] languages = new String[5];
value[0] = 1;
languages[0] = "Spring";
value[1] = 2;
languages[1] = "JSF";
value[2] = 3;
languages[2] = "Struts";
value[3] = 4;
languages[3] = "EJB";
value[4] = 5;
languages[4] = "JPA";
frame.getContentPane().add(new SampleBarChart(value, languages,
"Framework Java"));
WindowListener winListener = new WindowAdapter() {
public void windowClosing(WindowEvent event) {
System.exit(0);
}
};
frame.addWindowListener(winListener);
frame.setVisible(true);
}
}
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