ServletOutputStream out = res.getOutputStream();
Frame frame = null;
Graphics g = null;
try {
// Create a simple chart
BarChart chart = new BarChart("Apples and Oranges");
// Give it a title
chart.getBackground().setTitleFont(new Font("Serif", Font.PLAIN, 24));
chart.getBackground().setTitleString("Comparing Apples and Oranges");
// Show, place, and customize its legend
chart.setLegendVisible(true);
chart.getLegend().setLlX(0.4); // normalized from lower left
chart.getLegend().setLlY(0.75); // normalized from lower left
chart.getLegend().setIconHeight(0.04);
chart.getLegend().setIconWidth(0.04);
chart.getLegend().setIconGap(0.02);
chart.getLegend().setVerticalLayout(false);
// Give it its data and labels
double[] appleData = {950, 1005, 1210, 1165, 1255};
chart.addDataSet("Apples", appleData);
double[] orangeData = {1435, 1650, 1555, 1440, 1595};
chart.addDataSet("Oranges", orangeData);
String[] labels = {"1993", "1994", "1995", "1996", "1997"};
chart.getXAxis().addLabels(labels);
// Color apples red and oranges orange
chart.getDatasets()[0].getGc().setFillColor(Color.red);
chart.getDatasets()[1].getGc().setFillColor(Color.orange);
// Name the axes
chart.getXAxis().setTitleString("Year");
chart.getYAxis().setTitleString("Tons Consumed");
// Size it appropriately
chart.resize(WIDTH, HEIGHT);
// Create an unshown frame
frame = new Frame();
frame.addNotify();
// Get a graphics region of appropriate size, using the Frame
Image image = frame.createImage(WIDTH, HEIGHT);
g = image.getGraphics();
// Ask the chart to draw itself to the off screen graphics context
chart.drawGraph(g);
// Encode and return what it painted
res.setContentType("image/gif");
GifEncoder encoder = new GifEncoder(image, out);
encoder.encode();
}
finally {
// Clean up resources
if (g != null) g.dispose();
if (frame != null) frame.removeNotify();
}
