CreatePolygon

Create a polygon in the 3D Window.

Note:    To polygonize the resulting polygon (in order to find and resolve any intersecting lines) call StartEdit() followed by EndEdit().

Parameters

Geometry

An IGeometry representing geometric properties of the polygon.

LineColor

The color of the lines that make up the polygon. The color value is used to specify color and transparency values. This parameter can be any of the following:

·          An IColor80 object.

·          A number which represents the color in ABGR format (0xAABBGGRR). The low-order byte contains a value for the relative intensity of red; the second byte contains a value for green; the third byte contains a value for blue. The high-order byte contains a value for alpha.

·          A string that represents HTML color format (“#RRGGBB”).

FillColor

The color which fills the polygon, if the alpha value is greater than zero. The color value is used to specify color and transparency values. This parameter can be any of the following:

·          An IColor80 object.

·          A number which represents the color in ABGR format (0xAABBGGRR). The low-order byte contains a value for the relative intensity of red; the second byte contains a value for green; the third byte contains a value for blue. The high-order byte contains a value for alpha.

·          A string that represents HTML color format (“#RRGGBB”).

AltitudeType

An enum that determines the altitude type to be used by the polygon. The following are the possible values:

·          ATC_TERRAIN_RELATIVE = 0
Places the polygon’s pivot point at a specified altitude above the ground.

·          ATC_PIVOT_RELATIVE = 1
Places each point of the polygon at a specified altitude above the pivot point altitude, defined by its Point Altitude. In addition, for this value only, X and Y coordinates are also relative to the polygon’s pivot. The pivot is located at the center of the polygon.

·          ATC_ON_TERRAIN = 2
Creates the polygon on the terrain itself.

·          ATC_TERRAIN_ABSOLUTE = 3
Places the polygon’s pivot point at a specified altitude above the terrain database vertical datum base ellipsoid.

GroupID

The Project Tree group in which the polygon is created. If it is set to an empty string, the object is created under the root. You can obtain the GroupID by one of the following methods:

·          Create the group using IProjectTree80.CreateGroup.

·          Find the group, if you know the name, using IProjectTree80.FindItem.

·          Traverse the Tree using IProjectTree80 methods such as GetNextItem, until you come to the desired GroupID.

Description

The name of the polygon as it appears in the Project Tree. If an empty string is passed into this parameter, TerraExplorer assigns it a unique name.

Return Value

pITerrainPolygon80

An ITerrainPolygon80, representing the newly created polygon.

Exceptions

See: HRESULT Return Values for a list of possible values returned by the HRESULT.