Create3DArrow

The Create3DArrow method creates a 3-dimensional arrow and places it in the 3D Window.

HRESULTCreate3DArrow (

[in] double HeadX,

[in] double HeadY,

[in] double Elevation,

[in] double Direction,

[in] double Length,

[in, defaultvalue(4)] int Style,

[in, defaultvalue(10)] double ObjectHeight,

[in, defaultvalue(0x0000ff00)] long LineColor,

[in, defaultvalue(FT_NONE)] double FillOpacity,

[in, defaultvalue(0x00646464)] long FillColor,

[in, defaultvalue(0)] HeightStyleCode HeightStyle,

[in, defaultvalue(0)] long GroupID,

[in, defaultvalue("")] BSTR Description,

[out, retval] ITerrain3DArrow5** pITerrain3DArrow5)

Parameters:

• HeadX – The West-East coordinate of the tip of the 3-dimensional arrow’s head, represented in MPT units. You can use the ITerrain interface to retrieve information about the MPT units. If you are working in Lat-Long format, the Lat-Long values are in decimal Lat-Long.

• HeadY – The North-South coordinate of the tip of the 3-dimensional arrow’s head, represented in MPT units. You can use the ITerrain interface to retrieve information about the MPT units. If you are working in Lat-Long format, the Lat-Long values are in decimal Lat-Long.

• Elevation – The elevation of the 3-dimensional arrow relative to the terrain.

• Direction – The direction the 3-dimensional arrow is pointing. Direction, in this case, is synonymous with yaw.

• Length – The length of the 3-dimensional arrow from head to tail (in meters).

• Style – The style of the 3-dimensional arrow. Can be one of the following when looking at the arrow from a top-view:
            

• ObjectHeight – The height of the 3-dimensional arrow (in meters).

• LineColor – The color of the lines that make up the 3-dimensional arrow. The color value is used to specify an RGB color. When specifying an explicit RGB color, the color value has the following hexadecimal form: 0x00bbggrr. The low-order byte contains a value for the relative intensity of red; the second byte contains a value for green; and the third byte contains a value for blue. The high-order byte must be zero. The maximum value for a single byte is 0xFF.

• FillOpacity – Determines the opacity or transparency of the fill of the 3-dimensional arrow. This value can be any value between 0, for transparent, and 1 for opaque.

• FillColor – The color with which the 3-dimensional arrow is filled if the FillOpacity value is greater than 0. The color value is used to specify an RGB color. When specifying an explicit RGB color, the color value has the following hexadecimal form: 0x00bbggrr. The low-order byte contains a value for the relative intensity of red; the second byte contains a value for green; and the third byte contains a value for blue. The high-order byte must be zero. The maximum value for a single byte is 0xFF.

• HeightStyle – An enum determining how the 3-dimensional arrow is placed on the terrain.

The HeightStyleCode enum can use any of the following values:

• HSC_TERRAIN_RELATIVE = 0
  The height above the terrain of the 3-dimensional arrow’s pivot (the center of its base), is determined by the Elevation parameter. Each of the base vertices lies in the same plane as the object’s pivot.

• HSC_TERRAIN_ABSOLUTE = 3
  The height relative to the terrain database vertical datum base ellipsoid of the 3-dimensional arrow’s pivot (the center of its base), is determined by the Elevation parameter. Each of the base vertices lies in the same plane as the object’s pivot.

• GroupID – The Information Tree group in which the 3-dimensional arrow is created. If it is set to zero, the arrow is created under the root. You can obtain the GroupID by one of the following methods:

• Create the group the IInformationTree5::CreateGroup.

• If you know the name of the group, find it using IInformationTree5::FindItem.

• Traverse the Tree using IInformationTree5 methods such as GetNextItem, until you come to the desired GroupID.

• Description – The name of the 3-dimensional arrow as it appears in the Information Window. If an empty string is passed into this parameter, TerraExplorer assigns it a unique name.

• pITerrain3DArrow5 – An interface pointer to the newly created 3-dimensional arrow. This parameter must not be Null.

Return Values:

The return value obtained from the returned HRESULT can be one of the following: