Package com.luciad.shape.shape2D

Class TLcdLonLatPolygon

java.lang.Object
com.luciad.shape.ALcdShape
com.luciad.shape.shape2D.ALcd2DEditableShape
com.luciad.shape.shape2D.ALcd2DEditablePolypoint
com.luciad.shape.shape2D.TLcdLonLatPolypoint
com.luciad.shape.shape2D.TLcdLonLatPolygon
All Implemented Interfaces:
ILcdBounded, ILcdCurve, ILcdPointList, ILcdPointList2, ILcdPolygon, ILcdPolypoint, ILcdRing, ILcdShape, ILcd2DEditablePointList, ILcd2DEditablePolygon, ILcd2DEditablePolypoint, ILcd2DEditableShape, ILcdCache, ILcdCloneable, ILcdInvalidateable, Serializable, Cloneable
Direct Known Subclasses:
TLcdLonLatMPolygon
public class TLcdLonLatPolygon extends TLcdLonLatPolypoint implements ILcd2DEditablePolygon, ILcdRing
This class provides an implementation of ILcd2DEditablePolygon in the geodetic space. In addition to the properties defined by ILcd2DEditablePolygon, a TLcdLonLatPolygon has an ellipsoid on which it lives.

All longitude/latitude coordinates are expressed in degrees.

This class is thread-safe for concurrent read-only access of its contents. For read-write access, external locking must be used. Such locking is typically done at the model level.

Note that the ILcd2DEditablePointList representing the actual geometry should provide geodetic points (TLcdLonLatPoint), not cartesian (TLcdXYPoint).

See Also:

  • Constructor Details

    • TLcdLonLatPolygon

      public TLcdLonLatPolygon()
      Creates an empty polygon on a default (WGS 84) ellipsoid.

    • TLcdLonLatPolygon

      public TLcdLonLatPolygon(ILcd2DEditablePointList a2DEditablePointList)
      Creates a polygon using the given point list.
      • The point list and the points therein are not copied, and can be modified by this object
      • The point list should contain TLcdLonLatPoints
      The default ellipsoid (WGS 84) is used.
      Parameters:
      a2DEditablePointList - A point list containing lon-lat points.

    • TLcdLonLatPolygon

      public TLcdLonLatPolygon(ILcd2DEditablePointList a2DEditablePointList, ILcdEllipsoid aEllipsoid)
      Creates a polygon using the given point list.
      • The point list and the points therein are not copied, and can be modified by this object
      • The point list should contain TLcdLonLatPoints
      Parameters:
      a2DEditablePointList - A point list containing lon-lat points.
      aEllipsoid - the ellipsoid on which to define the polygon

    • TLcdLonLatPolygon

      public TLcdLonLatPolygon(TLcdLonLatPolygon aLonLatPolygon, boolean aDeepCopy)
      Creates a polygon based on another polygon.
      • When aDeepCopy is true, and the given polygon has a cloneable pointlist (see ILcdCloneable, for example TLcd2DEditablePointList), the underlying points will be cloned.
      • Otherwise, the underlying pointlist is re-used by the new polygon, and updates affect both polygons.
      Parameters:
      aLonLatPolygon - The polygon to copy
      aDeepCopy - whether to make a copy of the points, if possible

  • Method Details

    • getEllipsoid

      public ILcdEllipsoid getEllipsoid()
      Get the ellipsoid used for this polygon.
      Returns:
      the ellipsoid using for this polygon

    • setEllipsoid

      public void setEllipsoid(ILcdEllipsoid aEllipsoid)
      Set the ellipsoid used for this polygon.
      Parameters:
      aEllipsoid - the new ellipsoid

    • getOrientation

      public int getOrientation()
      Description copied from interface: ILcdPolygon
      Returns the orientation of this ILcdPolygon: ILcdPolygon.CLOCKWISE or ILcdPolygon.COUNTERCLOCKWISE.
      Specified by:
      getOrientation in interface ILcdPolygon
      Returns:
      the orientation of this ILcdPolygon: ILcdPolygon.CLOCKWISE or ILcdPolygon.COUNTERCLOCKWISE. This method should not return INVALID_ORIENTATION, which is only to be used for resetting the orientation so that it can be recalculated.

    • setOrientation

      public final void setOrientation(int aOrientation)
      Sets the orientation of this ILcd2DEditablePolygon.

      Note: modifying the geometry of this polygon or modifying the ellipsoid setEllipsoid(com.luciad.geodesy.ILcdEllipsoid) will clear the orientation.

      Specified by:
      setOrientation in interface ILcd2DEditablePolygon
      Parameters:
      aOrientation - ILcd2DEditablePolygon.CLOCKWISE, ILcd2DEditablePolygon.COUNTERCLOCKWISE or ILcd2DEditablePolygon.INVALID_ORIENTATION.

    • set2DEditablePointList

      public void set2DEditablePointList(ILcd2DEditablePointList a2DEditablePointList)
      Overrides:
      set2DEditablePointList in class ALcd2DEditablePolypoint

    • move2DPoint

      public void move2DPoint(int aIndex, double aX, double aY)
      Description copied from interface: ILcd2DEditablePointList
      Moves the specified point of this ILcd2DEditablePointList to the given point in the 2D space. Only the first two dimensions of the ILcdShape are considered. The third dimension is left unchanged.
      Specified by:
      move2DPoint in interface ILcd2DEditablePointList
      Overrides:
      move2DPoint in class ALcd2DEditablePolypoint
      Parameters:
      aIndex - a valid index in the list of points.
      aX - the x coordinate of the point.
      aY - the y coordinate of the point.

    • translate2DPoint

      public void translate2DPoint(int aIndex, double aDeltaX, double aDeltaY)
      Description copied from interface: ILcd2DEditablePointList
      Translates the specified point of this ILcd2DEditablePointList from its current position over the given translation vector in the 2D space. Only the first two dimensions of the points are considered. The third dimension is left unchanged.
      Specified by:
      translate2DPoint in interface ILcd2DEditablePointList
      Overrides:
      translate2DPoint in class ALcd2DEditablePolypoint
      Parameters:
      aDeltaX - the x coordinate of the translation vector.
      aDeltaY - the y coordinate of the translation vector.

    • insert2DPoint

      public void insert2DPoint(int aIndex, double aX, double aY)
      Description copied from interface: ILcd2DEditablePointList
      Inserts a point at the given index into this ILcd2DEditablePointList.
      Specified by:
      insert2DPoint in interface ILcd2DEditablePointList
      Overrides:
      insert2DPoint in class ALcd2DEditablePolypoint
      Parameters:
      aIndex - a valid new index in the list of points.
      aX - the x coordinate of the new point.
      aY - the y coordinate of the new point.

    • removePointAt

      public void removePointAt(int aIndex)
      Description copied from interface: ILcd2DEditablePointList
      Removes the point at the given index from this ILcd2DEditablePointList.
      Specified by:
      removePointAt in interface ILcd2DEditablePointList
      Overrides:
      removePointAt in class ALcd2DEditablePolypoint
      Parameters:
      aIndex - a valid index in the list of ILcdPoint objects.

    • calculateBounds

      protected void calculateBounds()
      Description copied from class: ALcd2DEditablePolypoint
      Computes the bounds of the polypoint. The resulting bounds are stored in fBounds.
      Overrides:
      calculateBounds in class TLcdLonLatPolypoint

    • computePointSFCT

      public void computePointSFCT(double aParam, ILcd3DEditablePoint aPointSFCT)
      Description copied from interface: ILcdCurve
      Computes a point of the curve, defined by the given parameter.
      Specified by:
      computePointSFCT in interface ILcdCurve
      Parameters:
      aParam - a value of the closed interval [0,1]
      aPointSFCT - the point to store the computed curve point in

    • getEndPoint

      public ILcdPoint getEndPoint()
      Description copied from interface: ILcdCurve
      Retrieves the end point of the curve.

      This is equivalent to computePointSFCT(1).

      Specified by:
      getEndPoint in interface ILcdCurve
      Returns:
      the end point of the curve

    • getEndTangent2D

      public double getEndTangent2D()
      Description copied from interface: ILcdCurve
      Returns the angle of the curve's tangent at the end point, in degrees counterclockwise from the direction at 3 o'clock.

      The tangent orientation is from the end point, away from the curve before it.

      This is the same as getTangent2D(1).

      Specified by:
      getEndTangent2D in interface ILcdCurve
      Returns:
      the curve's angle in the end point

    • getInterpolation

      public String getInterpolation()
      Description copied from interface: ILcdCurve
      Returns the interpolation method used by this curve.

      A set of predefined constants are defined in this interface, which are used by the default ILcdCurve implementations provided by LuciadLightspeed.

      Custom implementations can define their own constants, and use them to interpret the interpolation of the curve.

      Specified by:
      getInterpolation in interface ILcdCurve
      Returns:
      the interpolation method used by this curve.

    • getLength2D

      public double getLength2D(double aParam1, double aParam2)
      Description copied from interface: ILcdCurve
      Returns the length between two points of the curve, defined by the given parameters.
      • When aParam1 == aParam2, the length is 0.
      • When aParam1 == 0 and aParam2 == 1, the length is the whole length of the curve.
      • When aParam1 > aParam2, the length is (aParam1 to 1) + (0 to aParam2).
      Specified by:
      getLength2D in interface ILcdCurve
      Parameters:
      aParam1 - a value of the closed interval [0,1]
      aParam2 - a value of the closed interval [0,1]
      Returns:
      the length of the curve.

    • getLineSegmentIntersectionCount

      public int getLineSegmentIntersectionCount(ILcdPoint aP1, ILcdPoint aP2)
      Description copied from interface: ILcdCurve
      Returns the number of intersections between this curve and a line segment defined by the two specified points.

      This information can be used to perform containment calculations, if this curve is closed or if this curve is part of a composite closed curve. By determining the number of intersections between this curve and a line segment starting from a given point in a fixed direction, one can determine whether a point is located within the closed curve by using the even-odd rule.

      Specified by:
      getLineSegmentIntersectionCount in interface ILcdCurve
      Parameters:
      aP1 - the first point of the line segment
      aP2 - the second point of the line segment
      Returns:
      the number of intersections between the curve and the line segment

    • getStartPoint

      public ILcdPoint getStartPoint()
      Description copied from interface: ILcdCurve
      Retrieves the start point of the curve.

      This is equivalent to computePointSFCT(0).

      Specified by:
      getStartPoint in interface ILcdCurve
      Returns:
      the start point of the curve

    • getStartTangent2D

      public double getStartTangent2D()
      Description copied from interface: ILcdCurve
      Returns the angle of the curve's tangent at the start point, in degrees counterclockwise from the direction at 3 o'clock.

      The tangent orientation is from the start point towards the rest of the shape.

      This is the same as getTangent2D(0).

      Specified by:
      getStartTangent2D in interface ILcdCurve
      Returns:
      the curve's angle in the start point

    • getTangent2D

      public double getTangent2D(double aParam)
      Description copied from interface: ILcdCurve
      Returns the angle of the curve's tangent in the point defined by the given parameter, in degrees counterclockwise from the direction at 3 o'clock.

      The tangent orientation is from the point at parameter aParam towards the rest of the shape.

      Specified by:
      getTangent2D in interface ILcdCurve
      Parameters:
      aParam - a value of the closed interval [0,1]
      Returns:
      the curve's angle in the point defined by the given parameter

    • contains2D

      public boolean contains2D(ILcdPoint aPoint)
      The implementation of the method is based on a spherical approximation. We define the ILcdPoint aPoint to be inside if:
      • aPoint interacts with the polygon bounds
      • aPoint has an odd number of polygon edge intersections within a distance of 180 degrees in northern direction (azimuth zero degrees)
      The polygon thus shouldn't be larger than a hemisphere.
      Specified by:
      contains2D in interface ILcdShape
      Overrides:
      contains2D in class ALcdShape
      Parameters:
      aPoint - the point to test.
      Returns:
      the boolean result of the containment test.
      See Also:

    • contains2D

      public boolean contains2D(double aLon, double aLat)
      Description copied from interface: ILcdShape
      Checks whether this ILcdShape contains the given point in the 2D space. Only the first two dimensions of the ILcdShape are considered.
      Specified by:
      contains2D in interface ILcdShape
      Overrides:
      contains2D in class ALcd2DEditablePolypoint
      Parameters:
      aLon - the x coordinate of the point.
      aLat - the y coordinate of the point.
      Returns:
      the boolean result of the containment test.

    • clone

      public Object clone()
      Creates and returns a copy of this object.

      The contained editable points list is cloned. If cloning is not possible, a warning is sent to the log and a shallow copy is returned.

      The contained ellipsoid is copied without being cloned.

      The cache, the bounds and the focus point are not copied or cloned at all, but recalculated when needed.

      Specified by:
      clone in interface ILcdCloneable
      Overrides:
      clone in class TLcdLonLatPolypoint
      See Also: