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public interface ICurve
Provides access to properties and methods of all 1 dimensional curves (polylines, segments, boundaries of polygons, etc.).
A curve is an abstract onedimensional geometry between specific From and To points. A curve can be composed of a single Segment, a Path of connected segments, or a Polycurve containing many paths of segments. The properties and methods of the curve allow the user to query information about the entire curve or points along the curve. The distance along the curve can be specified in a fixed unit of measure or as a ratio of the Length of the curve. The user can obtain information about Tangents, Normals, Subcurves, and Points along the curve.
\/*
* Application Name: CurveDemo.java
*\/
import com.esri.arcgis.geometry.CircularArc;
import com.esri.arcgis.geometry.ICircularArc;
import com.esri.arcgis.geometry.ICircularArcProxy;
import com.esri.arcgis.geometry.ICurve;
import com.esri.arcgis.geometry.ILine;
import com.esri.arcgis.geometry.IPoint;
import com.esri.arcgis.geometry.Line;
import com.esri.arcgis.geometry.Point;
import com.esri.arcgis.geometry.esriSegmentExtension;
import com.esri.arcgis.system.EngineInitializer;
public class CurveDemo {
private static boolean asRatio;
private static boolean[] right;
private static double[] distOnCurve;
private static double[] nearDist;
public static String outputPoint(IPoint pnt) throws Exception{
String output = "(" + pnt.getX() + ", " + pnt.getY() + ")";
return output;
}
public static String outputLine(ILine line) throws Exception{
IPoint fromPnt = new Point();
IPoint toPnt = new Point();
line.queryFromPoint(fromPnt);
line.queryToPoint(toPnt);
String output = "From " + outputPoint(fromPnt) + " to " + outputPoint(toPnt);
return output;
}
public static void main(String[] args) throws Exception{
EngineInitializer.initializeEngine();
System.out.println("CurveDemo");
IPoint origin = new Point();
CircularArc cArc = new CircularArc();
ICurve[] subArc = {new CircularArc()};
\/* define the center point of the circle *\/
origin.putCoords(0, 0);
cArc.putCoordsByAngle(origin, 0, 2 * Math.PI, 100); // 0 to 2PI = Full Circle
\/* subArc is set by GetSubcurve. Halfarc (Pi/2 to 3Pi/2) *\/
cArc.getSubcurve(0.25, 0.75, true, subArc);
ICircularArc subArc2 = new ICircularArcProxy(subArc[0]);
System.out.println(" Main Closed = " + cArc.IsClosed());
System.out.println(" Length: " + cArc.getLength());
System.out.println(" Sub Closed = " + subArc2.IsClosed());
System.out.println(" Length: " + subArc2.getLength());
\/*
* Subcurve From point (0.0) is the same as the main curve point at 0.25 (25%)
* Subcurve To point (1.0) is the same as the main curve point at 0.75 (75%)
*\/
System.out.println(" Subcurve from: " + outputPoint(subArc2.getFromPoint()));
System.out.println(" Subcurve to: " + outputPoint(subArc2.getToPoint()));
\/*
* Query the tangent (length 20) of the point 0.3 (30%) along the subcurve
* Query the normal (length 10) of the point 0.4 (40%) along the main curve
* Note: 0.3 (30%) along the subcurve is the same point as the point
* 0.4 (40%) along the main curve
*\/
ILine tangent = new Line();
ILine normal = new Line();
subArc2.queryTangent(esriSegmentExtension.esriExtendTangentAtFrom, 0.3, true, 20, tangent);
cArc.queryNormal(esriSegmentExtension.esriExtendTangentAtFrom, 2 * subArc2.getLength()/5, false, 10, normal);
System.out.println(" Tangent: " + outputLine(tangent));
System.out.println(" Normal: " + outputLine(normal));
\/*Finds the point along the To tangent extended 20% beyond the ToPoint*\/
IPoint tangentPnt = new Point();
cArc.queryPoint(esriSegmentExtension.esriExtendTangentAtTo, 1.2, true, tangentPnt);
System.out.println(" Point on Tangent: " + outputPoint(tangentPnt));
\/*
* Finds the point on the Circular Arc nearest to the point extended tangentially
* Returns the nearest point, the distance to the point, the distance along the curve,
* whether the point is on the right side of the curve, and AsRatio indicator
*\/
IPoint nearPnt = new Point();
cArc.queryPointAndDistance(esriSegmentExtension.esriNoExtension, tangentPnt, asRatio, nearPnt, distOnCurve, nearDist, right);
System.out.println(" Nearest Point: " + outputPoint(nearPnt));
System.out.println(" Distance: " + nearDist);
subArc2.reverseOrientation(); // subArc now is the arc from 3Pi/2 to Pi/2
}
}
IPolycurve
,
ICircularArc
,
IPoint
,
IPolygon
,
IEllipticArc
,
IGeometry
,
IRing
,
IBezierCurve
,
IPolycurve2
,
ILine
,
IPolyline
,
ISegment
,
IPath
Method Summary  

IPoint 
getFromPoint()
The 'from' point of the curve. 
double 
getLength()
The length of the curve. 
void 
getSubcurve(double fromDistance,
double toDistance,
boolean asRatio,
ICurve[] outSubcurve)
Extracts a portion of this curve into a new curve. 
IPoint 
getToPoint()
The 'to' point of the curve. 
boolean 
isClosed()
Indicates if 'from' and 'to' points (of each part) are identical. 
void 
queryFromPoint(IPoint from)
Copies this curve's 'from' point to the input point. 
void 
queryNormal(int extension,
double distanceAlongCurve,
boolean asRatio,
double length,
ILine normal)
Constructs a line normal to a curve from a point at a specified distance along the curve. 
void 
queryPoint(int extension,
double distanceAlongCurve,
boolean asRatio,
IPoint outPoint)
Copies to outPoint the properties of a point on the curve at a specified distance from the beginning of the curve. 
void 
queryPointAndDistance(int extension,
IPoint inPoint,
boolean asRatio,
IPoint outPoint,
double[] distanceAlongCurve,
double[] distanceFromCurve,
boolean[] bRightSide)
Finds the point on the curve closest to inPoint, then copies that point to outPoint; optionally calculates related items. 
void 
queryTangent(int extension,
double distanceAlongCurve,
boolean asRatio,
double length,
ILine tangent)
Constructs a line tangent to a curve from a point at a specified distance along the curve. 
void 
queryToPoint(IPoint to)
Copies the curve's 'to' point into the input point. 
void 
reverseOrientation()
Reverses the parameterization of the curve ('from' point becomes 'to' point, first segment becomes last segment, etc). 
void 
setFromPoint(IPoint from)
The 'from' point of the curve. 
void 
setToPoint(IPoint to)
The 'to' point of the curve. 
Methods inherited from interface com.esri.arcgis.geometry.IGeometry 

geoNormalize, geoNormalizeFromLongitude, getDimension, getEnvelope, getGeometryType, getSpatialReference, isEmpty, project, queryEnvelope, setEmpty, setSpatialReferenceByRef, snapToSpatialReference 
Method Detail 

double getLength() throws IOException, AutomationException
Returns the length of the entire curve. The length of the curve is the sum of the lengths along each parameterized Segment between vertices along the curve.
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.IPoint getFromPoint() throws IOException, AutomationException
Returns or Sets the FromPoint of the first segment of the first part of the curve. While the curve may be composed of many parts and segments each with their own FromPoint, each curve only has a single From Point.
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.IPoint
,
ICurve.queryFromPoint(com.esri.arcgis.geometry.IPoint)
,
ICurve.getFromPoint()
,
ICurve.queryToPoint(com.esri.arcgis.geometry.IPoint)
,
ICurve.getToPoint()
void setFromPoint(IPoint from) throws IOException, AutomationException
from
 A reference to a com.esri.arcgis.geometry.IPoint (in)
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.void queryFromPoint(IPoint from) throws IOException, AutomationException
Used to query the FromPoint of the first Segment of the first part of the curve.
Note: The output geometry must be cocreated prior to the query. The output geometry is not cocreated by the method; it is populated. This can be used in performance critical situations. For example, creating the geometry only once outside a loop and use the query method could improve performance.
from
 A reference to a com.esri.arcgis.geometry.IPoint (in)
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.IPoint
,
ICurve.queryFromPoint(com.esri.arcgis.geometry.IPoint)
,
ICurve.getFromPoint()
,
ICurve.queryToPoint(com.esri.arcgis.geometry.IPoint)
,
ICurve.getToPoint()
IPoint getToPoint() throws IOException, AutomationException
Returns or Sets the ToPoint of the first Segment of the first part of the curve. While the curve may be composed of many parts and segments each with their own ToPoint, each curve only has a single To Point.
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.IPoint
,
ICurve.queryFromPoint(com.esri.arcgis.geometry.IPoint)
,
ICurve.getFromPoint()
,
ICurve.queryToPoint(com.esri.arcgis.geometry.IPoint)
,
ICurve.getToPoint()
void setToPoint(IPoint to) throws IOException, AutomationException
to
 A reference to a com.esri.arcgis.geometry.IPoint (in)
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.void queryToPoint(IPoint to) throws IOException, AutomationException
Used to query the ToPoint of the first Segment of the first part of the curve.
Note: The output geometry must be cocreated prior to the query. The output geometry is not cocreated by the method; it is populated. This can be used in performance critical situations. For example, creating the geometry only once outside a loop and use the query method could improve performance.
to
 A reference to a com.esri.arcgis.geometry.IPoint (in)
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.IPoint
,
ICurve.queryFromPoint(com.esri.arcgis.geometry.IPoint)
,
ICurve.getFromPoint()
,
ICurve.queryToPoint(com.esri.arcgis.geometry.IPoint)
,
ICurve.getToPoint()
void queryPoint(int extension, double distanceAlongCurve, boolean asRatio, IPoint outPoint) throws IOException, AutomationException
Returns the Point at a given distance along the curve or extended curve. If the distance is less than the length of the curve, then the returned point is the point at that distance along the curve. If the distance is less than zero, or greater than the length of the curve, then the returned point is on the curve specified by the extension method. The distance may be specified as a fixed unit of measure or a ratio of the length of the curve.
Note: The output geometry must be cocreated prior to the query. The output geometry is not cocreated by the method; it is populated. This can be used in performance critical situations. For example, creating the geometry only once outside a loop and use the query method could improve performance.
extension
 A com.esri.arcgis.geometry.esriSegmentExtension constant (in)distanceAlongCurve
 The distanceAlongCurve (in)asRatio
 The asRatio (in)outPoint
 A reference to a com.esri.arcgis.geometry.IPoint (in)
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.IPoint
,
esriSegmentExtension
void queryPointAndDistance(int extension, IPoint inPoint, boolean asRatio, IPoint outPoint, double[] distanceAlongCurve, double[] distanceFromCurve, boolean[] bRightSide) throws IOException, AutomationException
Finds the Point on the specified extended curve nearest to the input point and the distance between those points. Also returns information about the side of the curve the input point is on as well as the distance along the curve that the nearest point occurs.
AsRatio is an input parameter that only affects the DistanceAlongCurve
distanceFromCurve is an output parameter that represents the minimum distance between the curve and the input point.
DistanceAlongCurve is an output parameter that represents the distance between the Frompoint of the input curve and the returned point on the curve.
bRightSide is an output parameter that tells if the output point is on the right side of the curve. The direction of the curve determines the right and left sides.
Note: The output geometry must be cocreated prior to the query. The output geometry is not cocreated by the method; it is populated. This can be used in performance critical situations. For example, creating the geometry only once outside a loop and use the query method could improve performance.
extension
 A com.esri.arcgis.geometry.esriSegmentExtension constant (in)inPoint
 A reference to a com.esri.arcgis.geometry.IPoint (in)asRatio
 The asRatio (in)outPoint
 A reference to a com.esri.arcgis.geometry.IPoint (in)distanceAlongCurve
 The distanceAlongCurve (in/out: use single element array)distanceFromCurve
 The distanceFromCurve (in/out: use single element array)bRightSide
 The bRightSide (in/out: use single element array)
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.IPoint
void queryTangent(int extension, double distanceAlongCurve, boolean asRatio, double length, ILine tangent) throws IOException, AutomationException
Given a distance along the curve specified either as a ratio of the length or as a specific fixed distance, QueryTangent returns the Line tangent to the Point. The length and method of tangential extension of the tangent line are given by the user. The method of tangential extension determines the direction of the tangent line as though it were being extended at a From point or a To point.
extension
 A com.esri.arcgis.geometry.esriSegmentExtension constant (in)distanceAlongCurve
 The distanceAlongCurve (in)asRatio
 The asRatio (in)length
 The length (in)tangent
 A reference to a com.esri.arcgis.geometry.ILine (in)
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.ILine
void queryNormal(int extension, double distanceAlongCurve, boolean asRatio, double length, ILine normal) throws IOException, AutomationException
Given a distance along the curve specified either as a ratio of the Length or as a specific fixed distance, QueryNormal returns the Line normal to the Point. The length and method of tangential extension of the normal line are given by the user. The method of tangential extension determines the direction of the normal line as though it were being extended at a From point or a To point.
extension
 A com.esri.arcgis.geometry.esriSegmentExtension constant (in)distanceAlongCurve
 The distanceAlongCurve (in)asRatio
 The asRatio (in)length
 The length (in)normal
 A reference to a com.esri.arcgis.geometry.ILine (in)
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.ILine
void getSubcurve(double fromDistance, double toDistance, boolean asRatio, ICurve[] outSubcurve) throws IOException, AutomationException
Gets the subcurve between the specified points along the original curve and creates a new curve. The elements in the new subcurve are the same type and have the same properties as the elements of the original curve. Which means if:
Input Geometry  Output Geometry 

Polygon  Polyline 
Polyline  Polyline 
Ring  Path 
Path  Path 
Segment  Segment 
If the input geometry is a polygon, you may want to use IRing::GetSubCurveEx which has more capabilities.
fromDistance
 The fromDistance (in)toDistance
 The toDistance (in)asRatio
 The asRatio (in)outSubcurve
 A reference to a com.esri.arcgis.geometry.ICurve (out: use single element array)
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.IRing.getSubcurveEx(double, double, boolean, boolean, boolean)
,
ICurve.getSubcurve(double, double, boolean, com.esri.arcgis.geometry.ICurve[])
void reverseOrientation() throws IOException, AutomationException
ReverseOrientation changes the direction of the curve without changing the spatial position of the curve. The From Point and To Point of each Segment in each part of the curve are interchanged.
The ReverseOrientation method works the same way as the Arcedit FLIP command. It reverses the order of the vertices in the Curve.
Caution should be taken in using ReverseOrientation on Polygons. Since ReverseOrientation changes the direction of each Ring within the Polygon, all Exterior Rings become Interior Rings and vice versa.
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.boolean isClosed() throws IOException, AutomationException
A curve is closed if the From and To points of each part of the curve are equal.
IsClosed may still return TRUE if the curve consists of improperly constructed geometries (ex. noncontinuous paths). IsClosed only checks the location of the From and To points of each part, it does not check the internal parts for topological consistency.
IOException
 If there are interop problems.
AutomationException
 If the ArcObject component throws an exception.


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