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/**
* @version 1.20 1999-09-28
* @author Cay Horstmann
*/
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.io.Serializable;
import javax.swing.JPanel;
public class ChartBean extends JPanel implements Serializable {
public void paint(Graphics g) {
if (values == null || values.length == 0)
return;
int i;
double minValue = 0;
double maxValue = 0;
for (i = 0; i < values.length; i++) {
if (minValue > getValues(i))
minValue = getValues(i);
if (maxValue < getValues(i))
maxValue = getValues(i);
}
if (maxValue == minValue)
return;
Dimension d = getSize();
int clientWidth = d.width;
int clientHeight = d.height;
int barWidth = clientWidth / values.length;
g.setColor(inverse ? color : Color.white);
g.fillRect(0, 0, clientWidth, clientHeight);
g.setColor(Color.black);
Font titleFont = new Font("SansSerif", Font.BOLD, 20);
FontMetrics titleFontMetrics = g.getFontMetrics(titleFont);
int titleWidth = titleFontMetrics.stringWidth(title);
int y = titleFontMetrics.getAscent();
int x;
if (titlePosition == LEFT)
x = 0;
else if (titlePosition == CENTER)
x = (clientWidth - titleWidth) / 2;
else
x = clientWidth - titleWidth;
g.setFont(titleFont);
g.drawString(title, x, y);
int top = titleFontMetrics.getHeight();
double scale = (clientHeight - top) / (maxValue - minValue);
y = clientHeight;
for (i = 0; i < values.length; i++) {
int x1 = i * barWidth + 1;
int y1 = top;
int height = (int) (getValues(i) * scale);
if (getValues(i) >= 0)
y1 += (int) ((maxValue - getValues(i)) * scale);
else {
y1 += (int) (maxValue * scale);
height = -height;
}
g.setColor(inverse ? Color.white : color);
g.fillRect(x1, y1, barWidth - 2, height);
g.setColor(Color.black);
g.drawRect(x1, y1, barWidth - 2, height);
}
}
public void setTitle(String t) {
title = t;
}
public String getTitle() {
return title;
}
public double[] getValues() {
return values;
}
public void setValues(double[] v) {
values = v;
}
public double getValues(int i) {
if (0 <= i && i < values.length)
return values[i];
return 0;
}
public void setValues(int i, double value) {
if (0 <= i && i < values.length)
values[i] = value;
}
public boolean isInverse() {
return inverse;
}
public void setTitlePosition(int p) {
titlePosition = p;
}
public int getTitlePosition() {
return titlePosition;
}
public void setInverse(boolean b) {
inverse = b;
}
public Dimension getMinimumSize() {
return new Dimension(MINSIZE, MINSIZE);
}
public void setGraphColor(Color c) {
color = c;
}
public Color getGraphColor() {
return color;
}
private static final int LEFT = 0;
private static final int CENTER = 1;
private static final int RIGHT = 2;
private static final int MINSIZE = 50;
private double[] values = { 1, 2, 3 };
private String title = "Title";
private int titlePosition = CENTER;
private boolean inverse;
private Color color = Color.red;
}
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