ArcObjects Library Reference (Geometry)  

IConstructMultiPatch.ConstructExtrudeAlongLine Method

Construct a MultiPatch by extruding a (non-point) geometry along a specified line, using the Zs on the two ends of the line to set Zs on the top and bottom.

[Visual Basic .NET]
Public Sub ConstructExtrudeAlongLine ( _
    ByVal extrusionLine As ILine, _
    ByVal baseGeom As IGeometry _
)
[C#]
public void ConstructExtrudeAlongLine (
    ILine extrusionLine,
    IGeometry baseGeom
);
[C++]
HRESULT ConstructExtrudeAlongLine(
  ILine* extrusionLine,
  IGeometry* baseGeom
);
[C++]

Parameters

extrusionLine 

  extrusionLine is a parameter of type ILine

baseGeom 

  baseGeom is a parameter of type IGeometry

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

Description

Creates a MultiPatch from a base non-point geometry by extruding the base geometry along an axis defined by the input Line.  The base Z value of the geometry is uniformly set to the Z value of the Along Line's FromPoint and top Z value is uniformly set to the Z value of the Along Line's ToPoint.  The top geometry is also shifted in the X and Y directions by an offset defined by the X and Y change of the Along Line between From and To Points.  The resulting extrusion is always parallel to the XY-plane on both the base and top.

Remarks

All non-linear segments are treated as linear segments when extrusion is performed.  Only Polylines, Polygons, and Envelopes are allowed as input geometries.

ConstructMultiPatch ExtrudeAlongLine Example

[C#]

        private static object _missing = Type.Missing;

        public static IGeometry GetExample10()

        {

            const double CircleDegrees = 360.0;

            const int CircleDivisions = 36;

            const double VectorComponentOffset = 0.0000001;

            const double CircleRadius = 3.0;

            const double BaseZ = 0.0;

 

            //Extrusion: 3D Circle Polygon Extruded Along 3D Line Via ConstructExtrudeAlongLine()

 

            IPointCollection polygonPointCollection = new PolygonClass();

 

            IGeometry polygonGeometry = polygonPointCollection as IGeometry;

 

            MakeZAware(polygonGeometry);

 

            IPoint originPoint = ConstructPoint3D(0, 0, 0);

 

            IVector3D upperAxisVector3D = ConstructVector3D(0, 0, 10);

 

            IVector3D lowerAxisVector3D = ConstructVector3D(0, 0, -10);

 

            lowerAxisVector3D.XComponent += VectorComponentOffset;

 

            IVector3D normalVector3D = upperAxisVector3D.CrossProduct(lowerAxisVector3D) as IVector3D;

 

            normalVector3D.Magnitude = CircleRadius;

 

            double rotationAngleInRadians = GetRadians(CircleDegrees / CircleDivisions);

 

            for (int i = 0; i < CircleDivisions; i++)

            {

                normalVector3D.Rotate(-1 * rotationAngleInRadians, upperAxisVector3D);

 

                IPoint vertexPoint = ConstructPoint3D(originPoint.X + normalVector3D.XComponent,

                                                                      originPoint.Y + normalVector3D.YComponent,

                                                                      BaseZ);

 

                polygonPointCollection.AddPoint(vertexPoint, ref _missing, ref _missing);

            }

 

            polygonPointCollection.AddPoint(polygonPointCollection.get_Point(0), ref _missing, ref _missing);

 

            ITopologicalOperator topologicalOperator = polygonGeometry as ITopologicalOperator;

            topologicalOperator.Simplify();

 

            //Define Line To Extrude Along

 

            ILine extrusionLine = new LineClass();

            extrusionLine.FromPoint = ConstructPoint3D(-4, -4, -5);

            extrusionLine.ToPoint = ConstructPoint3D(4, 4, 5);

 

            //Perform Extrusion

 

            IConstructMultiPatch constructMultiPatch = new MultiPatchClass();

            constructMultiPatch.ConstructExtrudeAlongLine(extrusionLine, polygonGeometry);

 

            //Transform Extrusion Result

 

            IArea area = polygonGeometry as IArea;

 

            ITransform2D transform2D = constructMultiPatch as ITransform2D;

            transform2D.Move(extrusionLine.FromPoint.X - area.Centroid.X, extrusionLine.FromPoint.Y - area.Centroid.Y);

 

            return constructMultiPatch as IGeometry;

        }


        private static IVector3D ConstructVector3D(double xComponent, double yComponent, double zComponent)

        {

            IVector3D vector3D = new Vector3DClass();

            vector3D.SetComponents(xComponent, yComponent, zComponent);

 

            return vector3D;

        }

 

        private static double GetRadians(double decimalDegrees)

        {

            return decimalDegrees * (Math.PI / 180);

        }

 

        private static IPoint ConstructPoint3D(double x, double y, double z)

        {

            IPoint point = ConstructPoint2D(x, y);

            point.Z = z;

 

            return point;

        }

 

        private static IPoint ConstructPoint2D(double x, double y)

        {

            IPoint point = new PointClass();

            point.PutCoords(x, y);
 

            return point;

        }

 

        private static void MakeZAware(IGeometry geometry)

        {

            IZAware zAware = geometry as IZAware;

            zAware.ZAware = true;

        }

See Also

IConstructMultiPatch Interface | IExtrude.ExtrudeBetween Method | IExtrude.ExtrudeAbsolute Method | IConstructMultiPatch.ConstructExtrudeAlongLine Method | IConstructMultiPatch.ConstructExtrudeRelative Method | IConstructMultiPatch.ConstructExtrude Method | IExtrude.ExtrudeFromTo Method | IExtrude.ExtrudeRelative Method | IConstructMultiPatch.ConstructExtrudeFromTo Method | IConstructMultiPatch.ConstructExtrudeAbsolute Method | IExtrude.Extrude Method | IConstructMultiPatch Interface | IExtrude Interface | IConstructMultiPatch.ConstructExtrudeBetween Method | IExtrude.ExtrudeAlongLine Method | IGlobeHeightProperties.ExtrusionExpressionString Property