Working with the graph widget - Revision history

JenniferVendetti at 23:53, May 27, 2008

2008-05-27T23:53:03Z

JenniferVendetti: creating new mediawiki category for protege 3 documentation (and adding this page to the category)

2008-05-22T23:14:58Z

creating new mediawiki category for protege 3 documentation (and adding this page to the category)

JenniferVendetti: adding this page to the Protege Developer Documentation category

2008-05-22T23:13:02Z

adding this page to the Protege Developer Documentation category

JenniferVendetti at 01:34, August 15, 2007

2007-08-15T01:34:51Z

JenniferVendetti at 01:31, August 15, 2007

2007-08-15T01:31:29Z

JenniferVendetti: created page content

2007-08-15T01:29:22Z

created page content

New page

Two questions about programmatic access to the graph widget have been posted on the protege-discussion mailing list with some regularity:

# How do I programmatically save the contents of the graph widget to an image?
# How do I programmatically get position information for nodes in the graph widget?

The following code snippet shows how to accomplish both. It uses the newspaper example project that comes with the default installation of Protege. In the newspaper example project, The "employees" slot attached to the "Organization" class is configured to use the graph widget.

<pre>
public class GraphWidget_Test {
private static final String projectFileName = "C:/Protege_3.3/examples/newspaper/newspaper.pprj";

public static void main(String[] args) {
// open the newspaper example
Collection errors = new ArrayList();
Project project = new Project(projectFileName, errors);

// get the instance and slot objects from the kb that we want to work with
Instance instance = project.getKnowledgeBase().getInstance("instance_00064"); // a.k.a. -> "San Jose Mercury News"
Slot slot = project.getKnowledgeBase().getSlot("employees");

// necessary to put the clswidget into a jframe because the graph
// widget uses a 3rd party drawing library that won't initiliaze
// until it detects that it's in a window
ClsWidget cw = project.createRuntimeClsWidget(instance);
JFrame frame = new JFrame();
frame.getContentPane().add((Component) cw);
frame.pack();

// get the slot widget for the "employees" slot
SlotWidget sw = cw.getSlotWidget(slot);
if (sw instanceof GraphWidget) {
GraphWidget gw = (GraphWidget) sw;
BufferedImage image = gw.getImage();

try {
// save contents of graph widget as jpg
File f = new File("c:\\temp\\graph-widget.jpg");
ImageIO.write(image, "jpg", f);

// save contents of graph widget as png
File f2 = new File("c:\\temp\\graph-widget.png");
ImageIO.write(image, "png", f2);
} catch(java.io.IOException e) {
System.out.println(e.getMessage());
}

// print the position information for all of the slot values
// of the employee slot
ArrayList ownSlotValues = new ArrayList(instance.getDirectOwnSlotValues(slot));
Iterator i = ownSlotValues.iterator();
while (i.hasNext()) {
Instance ownSlotValue = (Instance) i.next();
Object obj = gw.getPositionInfo(instance, slot, ownSlotValue);
System.out.println("Position information for " + ownSlotValue.getBrowserText() + ": " + obj);
}
}
}
}
</pre>

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← Older revision		Revision as of 01:34, August 15, 2007
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	Two questions about programmatic access to the graph widget have been posted on the protege-discussion mailing list with some regularity:		Two questions about programmatic access to the graph widget have been posted on the protege-discussion mailing list with some regularity:

@@ Line 1: / Line 1: @@
 Two questions about programmatic access to the graph widget have been posted on the protege-discussion mailing list with some regularity:
 # How do I programmatically save the contents of the graph widget to an image?
 # How do I programmatically get position information for nodes in the graph widget?
 The following code snippet shows how to accomplish both.  It uses the newspaper example project that comes with the default installation of Protege.  In the newspaper example project, The "employees" slot attached to the "Organization" class is configured to use the graph widget.