Los Angeles, CA | Traffic Control Demo

Traffic Control Application Demo

This Traffic Control application demo (viewed as a Java applet). This applet is portable, performs exceptionally well and is highly compact — about 155K! The applet could be easily customized via simple text files, without any modification to code.

  • Buttons at the top control zoom and pan functions
  • Check boxes at the bottom control layer visibility.
  • Right-click on the map for a context sensitive pop-up menu of shortcuts.
  • Click on icons to display a dynamic pop-up dialogs.
  • Further instructions are provided below.



Development Notes:

This applet above displays real-time traffic information as icons that automatically update over a layered map.

To Zoom and Pan: Select ‘ Zoom In’ or ‘Zoom Out’ and click on a selected area of the map. Select ‘Pan’ and then drag the map holding down the left mouse button. Note: It is not possible to ‘Pan’ at 100% visibility. Click the right mouse button as a shortcut to toggle zoom/pan controls.

Click on an icon to invoke a dynamic pop-up dialog. Click ‘Deselect All’ to turn off the dialogs..

Use the check boxes at the bottom to control the display of various layers.

This application is about 155K,including the vector font, the icons and all interactive behaviors. Maps are stored in a binary format tailored for map poylines resulting in optimum compression and faster downloads.

The map data set parameters are set from user-defined text file which is read by the applet at runtime so it is easy to reconfigure without changing code.

The maps are generated from industry standard shape files with complete control over colors, edge-widths, layering, etc.

The Symbols are GMS models and are dynamically instantiated from DATA files. The DATA files contain records describing each icon and its attributes.