This document is archived and information here might be outdated. Recommended version. |
Provides access to members that identify third degree bezier curve segments and defines their properties. Note: the IBezierCurve interface has been superseded by IBezierCurve2. Please consider using the more recent version.
A Bezier Curve is a non-linear Segment defined by four control points. The bezier curve starts at control point 0 and ends at control point 3. Control points 0 and 1 define the tangent at the from point and control points 2 and 3 define the tangent at the to point. The length of these tangent lines and position of the control points determines the shape of the created bezier curve.
The IBezierCurve interface is used to define the properties/behavior of a Bezier Curve. For example, use the methods in this interface to put control points to define a Bezier Curve object or query an existing Bezier Curve object to get its four control points.
Name | Description | |
---|---|---|
Degree | The degree of the Bezier curve. For third degree Beziers, this is always 3. | |
Dimension | The topological dimension of this geometry. | |
Envelope | Creates a copy of this geometry's envelope and returns it. | |
FromPoint | The 'from' point of the curve. | |
GeometryType | The type of this geometry. | |
GeoNormalize | Shifts longitudes, if need be, into a continuous range of 360 degrees. | |
GeoNormalizeFromLongitude | Normalizes longitudes into a continuous range containing the longitude. This method is obsolete. | |
GetSubcurve | Extracts a portion of this curve into a new curve. | |
IsClosed | Indicates if 'from' and 'to' points (of each part) are identical. | |
IsEmpty | Indicates whether this geometry contains any points. | |
Length | The length of the curve. | |
Project | Projects this geometry into a new spatial reference. | |
PutCoord | Sets the specified (0 <= index < 4) control point of this Bezier curve. | |
PutCoords | Sets this Bezier curve's control points from an array of between 1 to 4 input points. | |
PutWKSCoords | Sets this Bezier curve's control points from the array of 4 input point structures. | |
QueryChordLengthTangentAtFrom | Returns tangent vector at 'from' point, based on chord length parametrization; and whether it has been set by user or by smoothing process. | |
QueryChordLengthTangentAtTo | Returns tangent vector at 'to' point, based on chord length parametrization; and whether it has been set by user or by smoothing process. | |
QueryCoord | Copies the specified control point of this Bezier curve into the input point. | |
QueryCoords | Copies this Bezier curve's control points into the array of 4 existing points. | |
QueryEnvelope | Copies this geometry's envelope properties into the specified envelope. | |
QueryFromPoint | Copies this curve's 'from' point to the input point. | |
QueryInflectionPoint | Finds inflection point; sets it empty if none exists. | |
QueryNormal | Constructs a line normal to a curve from a point at a specified distance along the curve. | |
QueryPoint | Copies to outPoint the properties of a point on the curve at a specified distance from the beginning of the curve. | |
QueryPointAndDistance | Finds the point on the curve closest to inPoint, then copies that point to outPoint; optionally calculates related items. | |
QueryTangent | Constructs a line tangent to a curve from a point at a specified distance along the curve. | |
QueryToPoint | Copies the curve's 'to' point into the input point. | |
QueryWKSCoords | Copies this Bezier curve's control points into the array of 4 existing point structures. | |
ReverseOrientation | Reverses the parameterization of the curve ('from' point becomes 'to' point, first segment becomes last segment, etc). | |
SetChordLengthTangentAtFrom | Establishes tangent vector at 'from' point, based on chord length parametrization; and sets flag whether it has been set by user or by smoothing process. | |
SetChordLengthTangentAtTo | Establishes tangent vector at 'to' point, based on chord length parametrization; and sets flag whether it has been set by user or by smoothing process. | |
SetEmpty | Removes all points from this geometry. | |
SnapToSpatialReference | Moves points of this geometry so that they can be represented in the precision of the geometry's associated spatial reference system. | |
SpatialReference | The spatial reference associated with this geometry. | |
ToPoint | The 'to' point of the curve. |
Interfaces | Description |
---|---|
ICurve | Provides access to properties and methods of all 1 dimensional curves (polylines, segments, boundaries of polygons, etc.). |
IGeometry | Provides access to members that describe properties and behavior of all geometric objects. |
Classes | Description |
---|---|
BezierCurve | A cubic Bezier curve defined between two points; optionally has measure, height and ID attributes at each endpoint. |
IPoint Interface | IGeometry Interface | ISegment Interface | IConstructBezierCurve Interface