Perforce JViews Diagrammer Code Example: Stop Layout Button

Description

This sample illustrates the use of the method IlvGraphLayout.stopImmediately to stop a running layout before completion. This sample uses the graphic framework, but it does not use the IlvDiagrammer component or CSS.

How to Use the Code Example

• This sample animates a layout performed by the Uniform Length Edges Layout algorithm. It demonstrates how to stop a running layout in a multi-threaded application. Therefore, the algorithm is artificially slowed down to give the user time to interact during the running layout.
• This application shows a manager view that displays a grapher read from an IVL file. You may change the grapher sample using the list at the top of the application.
• The application also has interactor buttons on the top side: pan, select, zoom box, zoom in, zoom out, and show all (fit to contents).
• At the bottom, there are three buttons:
  • The Randomize button randomizes the positions of the graph.
  • The Start Layout button starts a Uniform Length Edges Layout in a separate thread.
  • The Stop Layout button calls layout.stopImmediately() to stop the running layout before completion.

How to Run the Code Example as an Application

This code example can be run as an application. The installation directory contains an executable JAR file, stoplayoutbutton.jar, that allows you to execute the code example with a double click from a file browser. Note that if you are using Internet Explorer, you can open the installation directory and execute the JAR file from the browser. This technique may not work in other Web browsers.

Alternatively, you can run the code example application from the command line. First check that the Ant utility is properly configured. If not, see the instructions on how to configure Ant for Perforce JViews.

Then, go to the installation directory of the code example and type:

ant run

Topics Covered

• Grapher
• Graph Layout
• Multi Threaded Graph Layout
• Performance
• Animation
• Graph Layout Stop

Installation Directory

The Stop Layout Button code example is installed here.

Classes Involved

• ilog.views.graphlayout.IlvGraphLayout
• ilog.views.IlvGrapher
• ilog.views.IlvManagerView

Source Files

• StopLayoutApp