Creating a Polygon

This example demonstrates how to create a polygon using an array of vertices and set basic properties. This example uses the ILinearRing, IGeometry, ITerrainPolygon81, ICreator81 (CreatePolygon, GeometryCreator), IGeometryCreator (CreateLinearRingGeometry, CreatePolygonGeometry) INavigate81 (FlyTo), and IPosition81 (Copy, Pitch) properties and methods.

 

      function CreatePolygon()

      {

      try

      {

      //

      // B.  Create linear ring

      //

      {

      //B1. Create vertices double array, each point in format x,z,y

      var cVerticesArray = [

      -122.415025, 37.76059,  10,

      -122.415868, 37.760546, 11,

      -122.415922, 37.761244, 12,

      -122.415592, 37.761254, 13,

      -122.415557, 37.760973, 14,

      -122.415081, 37.76099,  15,

      ];

 

 

      // B2. Create linear ring using vertices

      {

      var cRing = sgworld.Creator.GeometryCreator.CreateLinearRingGeometry(cVerticesArray);

      }

      }

 

      //

      // C. Create polygon geometry using linear ring

      //

      {

      var cPolygonGeometry = sgworld.Creator.GeometryCreator.CreatePolygonGeometry(cRing, null);

      }

 

      //

      // D. Create polygon using polygon geometry

      //

      {

      // D1. Set polygon input params

      var nLineColor = 0xFF00FF00; // Abgr value -> solid green

      var nFillColor = 0x7FFF0000; // Abgr value -> 50% transparent blue

      var eAltitudeTypeCode = 0; //AltitudeTypeCode.ATC_TERRAIN_RELATIVE;

 

      // D2. Create polygon

      cPolygon = sgworld.Creator.CreatePolygon(cPolygonGeometry, nLineColor, nFillColor, eAltitudeTypeCode, "", "Polygon");

      }

 

      //

      // E. FlyTo polygon

      //

      {

      var cFlyToPos = cPolygon.Position.Copy();

      cFlyToPos.Pitch = -89.0; // Set camera to look downward on polygon

      sgworld.Navigate.FlyTo(cFlyToPos);

      }

      }

      catch (e)

      {

      alert("unexpected error: " + e.description);

      }

      }