This toolbox generates a great circle line annotation between two points on a map. This macro illustrates how to:

  1. Get a two-point line from the user
  2. Create an array of values
  3. Use coordinate geometry to create a new coordinate based on a distance and direction from an existing coordinate
  4. Create an annotation

You can modify the toolbox to let the user set the number of points, etc.


  1. Download the file GISDK_Great Circle and extract the file GREAT CIRCLE LINE.RSC. A good place to save the resource file is in the GISDK\Samples folder in the Maptitude program folder.
  2. Open or choose the layer you want to use.
  3. Choose Tools-GIS Developer's Kit-GISDK Toolbar to open the GISDK toolbar.
  4. Compile this toolbox in test mode using the Compile button (first button).
  5. Run this toolbox by clicking the Test button (second button), typing the dialog box name (Great Circle Line), clicking the Dialog Box radio button, and clicking OK.