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Node Creation and Information Retrieval

Application demonstrating the creation of nodes with attributes, and the retrieval and display of that information.

To Add a node, enter a name and age and click 'Add Node'
Clicking on a Node displays that nodes information in the box on the lower right corner
Clicking on save exports a graphML representation of the node structure

Screenshot

Application.java : Runs the application
ButtonListener.java : Defines actions to be taken when a button is pressed
GraphBuild.java : Builds the graph and visualization
mainframe.java : Builds the JFrame, Buttons, and Display fields
VizControlListener.java : Adds action listener to display information of clicked nodes

Executable

Explanation

buttonListener.java

Override the standard actionPerformed

	public void actionPerformed(ActionEvent e){

If new button is pressed, get the value of the name and age fields and create a new table row

		if ("new".equals(e.getActionCommand())){
				int row = table.addRow();
				String name = nameLabel.getText();
				int age = Integer.parseInt(ageLabel.getText());
				table.set(row, "Name", name);
				table.set(row, "Age", age);
				viz.run("draw");
			}

If save button is pressed, open a JFileChooser to allow user to save, then use GraphMLWriter to write out file

		if ("save".equals(e.getActionCommand())){
			JFileChooser fs = new JFileChooser();
			int returnval = fs.showSaveDialog(content);
			File save = fs.getSelectedFile();
			System.out.println(save);
			GraphMLWriter write = new GraphMLWriter();
			
			if (returnval == JFileChooser.APPROVE_OPTION)
			try{ 
				write.writeGraph(graph, save);
				//tw.writeTable(table, save); 
			}catch(Exception ex) { 
				System.out.println("Unable to Save File! : " + ex.toString());
				ex.printStackTrace();
				}
			}
		}

GraphBuild

GraphBuild extends visualization, so it's actually a visualization itself. The process of creating the visualization is standard, but the following function is added to the end to allow for the updating of the graph :

	public void addName(String newName, int newAge){
		row = table.addRow();
		table.set(row, "Name", newName);
		table.set(row, "Age", newAge);
		
	}

VizControlListener

overrides itemClicked. Retrives the name and age from the visualitem (the clicked node) and displays it in the displayfield.

	public void itemClicked(VisualItem v, MouseEvent e){
		String thisname = v.getString("Name");
		String thisage  = v.getString("Age");
		displayField.setText(thisname + " is " + thisage);
	}

http://cs.marlboro.edu/ courses/ fall2006/ tutorials/ information_visualization/ Node_Creation_and_Information_Retrieval
last modified Friday December 22 2006 1:37 am EST

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