Package com.luciad.shape.shape2D

Class TLcdLonLatFloatPolygon

java.lang.Object
com.luciad.shape.ALcdShape
com.luciad.shape.shape2D.ALcd2DEditableShape
com.luciad.shape.shape2D.ALcd2DEditableFloatPolypoint
com.luciad.shape.shape2D.TLcdLonLatFloatPolygon
All Implemented Interfaces:
ILcdBounded, ILcdCurve, ILcdPointList, ILcdPolygon, ILcdPolypoint, ILcdRing, ILcdShape, ILcd2DEditablePointList, ILcd2DEditablePolygon, ILcd2DEditablePolypoint, ILcd2DEditableShape, ILcdCloneable, Serializable, Cloneable
Direct Known Subclasses:
TLcdLonLatFloatPolygonCache
public class TLcdLonLatFloatPolygon extends ALcd2DEditableFloatPolypoint implements ILcd2DEditablePolygon, ILcdRing
This class provides an implementation of ILcd2DEditablePolygon in the geodetic space. Calculations are based on a spherical approximation.

It uses an array of floats instead of a TLcd2DEditablePointList of ILcd2DEditablePoint objects. A single array of floats stores the 2D coordinates. The points are stored as (x,y) pairs.

The boolean indicates whether the last 4 places in the array can be used to store the bounds of the ILcd2DEditablePolygon.

This class is thread-hostile, even for read-only access, since point instances are being reused from an internal pool.

See Also:

  • Constructor Details

    • TLcdLonLatFloatPolygon

      public TLcdLonLatFloatPolygon()

    • TLcdLonLatFloatPolygon

      public TLcdLonLatFloatPolygon(float[] aPoints, boolean aHasBounds, boolean aBoundsInitialized, boolean aClone)

    • TLcdLonLatFloatPolygon

      public TLcdLonLatFloatPolygon(TLcdLonLatFloatPolygon aLonLatFloatPolygon)

  • Method Details

    • invalidate

      protected void invalidate()
      Overrides:
      invalidate in class ALcd2DEditableFloatPolypoint

    • setOrientation

      public void setOrientation(int aOrientation)
      Description copied from interface: ILcd2DEditablePolygon
      Sets the orientation of this ILcd2DEditablePolygon.
      Specified by:
      setOrientation in interface ILcd2DEditablePolygon
      Parameters:
      aOrientation - ILcd2DEditablePolygon.CLOCKWISE, ILcd2DEditablePolygon.COUNTERCLOCKWISE or ILcd2DEditablePolygon.INVALID_ORIENTATION.

    • 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.

    • calculateBounds

      protected void calculateBounds(ILcd2DEditableBounds aBoundsSFCT)
      Description copied from class: ALcd2DEditableFloatPolypoint
      This method should compute the bounds of the polypoint. The resulting ILcd2DEditableBounds should be stored in aBoundsSFCT.
      Overrides:
      calculateBounds in class ALcd2DEditableFloatPolypoint
      Parameters:
      aBoundsSFCT - assumes the location and the width and height of the bounds of the polypoint.

    • 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)
      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 ALcd2DEditableFloatPolypoint
      Parameters:
      aLon - the x coordinate of the point.
      aLat - the y coordinate of the point.
      Returns:
      the boolean result of the containment test.

    • createPoint

      protected ILcd2DEditablePoint createPoint()
      Description copied from class: ALcd2DEditableFloatPolypoint
      Creates an uninitialized ILcd2DEditablePoint point of a type compatible with the concrete implementation of this class (geodesic/cartesian). The created point will be updated and returned by the ALcd2DEditableFloatPolypoint.getPoint(int) and ALcd2DEditableFloatPolypoint.getFocusPoint() methods.
      Specified by:
      createPoint in class ALcd2DEditableFloatPolypoint

    • createBounds

      protected ILcd2DEditableBounds createBounds()
      Description copied from class: ALcd2DEditableFloatPolypoint
      Creates an uninitialized ILcd2DEditableBounds object of a type compatible with the concrete implementation of this class. This bounds object will be updated and returned by the ALcd2DEditableFloatPolypoint.getBounds() method.
      Specified by:
      createBounds in class ALcd2DEditableFloatPolypoint

    • clone

      public Object clone()
      Description copied from class: ALcdShape
      Creates and returns a copy of this object, by delegating to Object.clone(). Extensions should delegate to this implementation with super.clone(), in order to create an object instance of the right type, with all fields copied. They then should explicitly clone any non-primitive fields for which a deeper clone is required.
      Specified by:
      clone in interface ILcdCloneable
      Overrides:
      clone in class ALcd2DEditableFloatPolypoint
      See Also:

    • 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