I have a tree structure that represents an org chart and I need to output the tree in PDF form. I have looked at Prefuse, JFreeChart, yFiles and JGraph but all seem to require that I write some logic. Has anyone done this before? Can anyone recommend a good library to use?
Jeff
Try AT&T's Graphviz.
Not sure what you mean by "logic", but you have to give the data about parents and children in the hierarchy someplace.
You can use Jfree Chart to generate a graph/tree. I have used JFree Chat ,it is very simple.you have to put data in 2 d array pass it to method.
/**
* A simple demonstration application showing how to create a bar chart.
* http://opengeekz.com
*/
public class CreateBarChart {
String aFileName="image1.jpg";
int width=250;
int height=200;
double quality=100;
JFreeChart chart=null;
/**
* Create bar chart for given data
* @param aFileName file name of image.
* @param width Width of image.
* @param height Height of image.
* @param quality Quality of image file .
*/
public CreateBarChart(String aFileName,int width,int height,double quality)
{
this.aFileName=aFileName;
this.width=width;
this.height=height;
this.quality=quality;
}
public CreateBarChart()
{
}
/**
* Accept 2D array for graph row denotes x axis,column denotes y axis.
* @param barchartdata 2D array for x axis, and y axis.
* @return CategoryDataset
*/
private static CategoryDataset createDataset(String barchartdata[][]) {
// row keys...
String series1 = "";
// column keys...
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
for(int i=barchartdata.length-1;i>=0;i--)
{
if(barchartdata[i][0]==null)
{
break;
}
else
{
String value_str=barchartdata[i][0];
value_str=value_str.replaceAll("#","");
float value=0;
value=Integer.parseInt(value_str);
dataset.addValue(value, series1,barchartdata[i][1]);
}
}
// create the dataset...
return dataset;
}
/**
*
* @param barchartdata 2D array for x axis, and y axis.
* @return JFreeChart object for data.
*/
public JFreeChart createChart(String barchartdata[][]) {
CategoryDataset dataset = createDataset(barchartdata);
chart = ChartFactory.createBarChart3D(
"", // chart title
"", // domain axis label
"", // range axis label
dataset, // data
PlotOrientation.VERTICAL, // orientation
false, // include legend
false, // tooltips?
false // URLs?
);
// NOW DO SOME OPTIONAL CUSTOMISATION OF THE CHART...
// set the background color for the chart...
chart.setBackgroundPaint(Color.white);
chart.setPadding(RectangleInsets.ZERO_INSETS);
// get a reference to the plot for further customisation...
CategoryPlot plot = chart.getCategoryPlot();
plot.setBackgroundPaint(Color.WHITE);
plot.setDomainGridlinePaint(Color.white);
plot.setDomainGridlinesVisible(true);
plot.setRangeGridlinePaint(Color.white);
plot.getDomainAxis().setCategoryMargin(0.0f);
// set the range axis to display integers only...
final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
// disable bar outlines...
BarRenderer renderer = (BarRenderer) plot.getRenderer();
renderer.setDrawBarOutline(true);
// set up gradient paints for series...
GradientPaint gp0 = new GradientPaint(
0.0f, 0.0f,new Color(0,118,112),
100.0f,100.0f,new Color(0,118,112)
);
renderer.setSeriesPaint(0, gp0);
CategoryAxis domainAxis = plot.getDomainAxis();
domainAxis.setCategoryLabelPositions(
CategoryLabelPositions.createUpRotationLabelPositions(Math.PI /5.0)
);
// OPTIONAL CUSTOMISATION COMPLETED.
try{
saveToFile(chart, aFileName);
}catch(Exception ex){ex.printStackTrace();}
return chart;
}
/**
* Save generated chart in jpg file.
* @param chart Object of JFreeChart class
* @param aFileName file name where jpg image to be saved.
* @throws FileNotFoundException
* @throws IOException
*/
private void saveToFile(JFreeChart chart,String aFileName)throws FileNotFoundException, IOException
{
BufferedImage img = draw(chart,width,height);
FileOutputStream fos = new FileOutputStream(aFileName);
JPEGImageEncoder encoder2 =JPEGCodec.createJPEGEncoder(fos);
JPEGEncodeParam param2 = encoder2.getDefaultJPEGEncodeParam(img);
param2.setQuality((float) quality, true);
encoder2.encode(img,param2);
fos.close();
} // saveToFile
/**
* Draw bar chat for JFreeChart object
* @param chart JFreeChart Object
* @param width Width of image
* @param height Height of Image
* @return Object of Buffered Image class
*/
private static BufferedImage draw(JFreeChart chart, int width, int height)
{
BufferedImage img =
new BufferedImage(width , height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = img.createGraphics();
try{
chart.draw(g2, new Rectangle2D.Double(0, 0, width, height));
g2.dispose();
}catch(Exception ex){ex.printStackTrace();}
return img;
} // end draw
/**
*
* @param args
* @throws FileNotFoundException
* @throws IOException
*/
public static void main(String[] args) throws FileNotFoundException, IOException {
CreateBarChart demo = new CreateBarChart("f:/image.jpg",250,300,100);
String data[][]=new String[2][2];
data[0][0]="30";
data[0][1]="jan";
data[1][0]="20";
data[1][1]="feb";
demo.createChart(data);
demo.saveToFile(demo.chart,"iamge.jpg");
}
}
This is a simple example of Jfree chart. You can use iText for Pdf Generation.
JGraph does have automatical layouting of nodes, try the tree layout, for example. There's also an example of exporting to PDF using iText.