Class CircleImpl

    • Field Detail

      • point

        protected final Point point
      • radiusDEG

        protected double radiusDEG
      • enclosingBox

        protected Rectangle enclosingBox
    • Method Detail

      • reset

        public void reset​(double x,
                          double y,
                          double radiusDEG)
        Description copied from interface: Circle
        Expert: Resets the state of this shape given the arguments. This is a performance feature to avoid excessive Shape object allocation as well as some argument error checking. Mutable shapes is error-prone so use with care.
        Specified by:
        reset in interface Circle
      • isEmpty

        public boolean isEmpty()
        Description copied from interface: Shape
        Shapes can be "empty", which is to say it exists nowhere. The underlying coordinates are typically NaN.
        Specified by:
        isEmpty in interface Shape
      • getCenter

        public Point getCenter()
        Description copied from interface: Shape
        Returns the center point of this shape. This is usually the same as getBoundingBox().getCenter() but it doesn't have to be.

        Postcondition: this.relate(this.getCenter()) == CONTAINS

        Specified by:
        getCenter in interface Shape
      • getRadius

        public double getRadius()
        Description copied from interface: Circle
        The distance from the point's center to its edge, measured in the same units as x & y (e.g. degrees if WGS84).
        Specified by:
        getRadius in interface Circle
      • getArea

        public double getArea​(SpatialContext ctx)
        Description copied from interface: Shape
        Calculates the area of the shape, in square-degrees. If ctx is null then simple Euclidean calculations will be used. This figure can be an estimate.
        Specified by:
        getArea in interface Shape
      • getBuffered

        public Circle getBuffered​(double distance,
                                  SpatialContext ctx)
        Description copied from interface: Shape
        Returns a buffered version of this shape. The buffer is usually a rounded-corner buffer, although some shapes might buffer differently. This is an optional operation.
        Specified by:
        getBuffered in interface Shape
        Returns:
        Not null, and the returned shape should contain the current shape.
      • contains

        public boolean contains​(double x,
                                double y)
      • hasArea

        public boolean hasArea()
        Description copied from interface: Shape
        Does the shape have area? This will be false for points and lines. It will also be false for shapes that normally have area but are constructed in a degenerate case as to not have area (e.g. a circle with 0 radius or rectangle with no height or no width).
        Specified by:
        hasArea in interface Shape
      • getBoundingBox

        public Rectangle getBoundingBox()
        Note that the bounding box might contain a minX that is > maxX, due to WGS84 anti-meridian.
        Specified by:
        getBoundingBox in interface Shape
      • relate

        public SpatialRelation relate​(Shape other)
        Description copied from interface: Shape
        Describe the relationship between the two objects. For example
        • this is WITHIN other
        • this CONTAINS other
        • this is DISJOINT other
        • this INTERSECTS other
        Note that a Shape implementation may choose to return INTERSECTS when the true answer is WITHIN or CONTAINS for performance reasons. If a shape does this then it must document when it does. Ideally the shape will not do this approximation in all circumstances, just sometimes.

        If the shapes are equal then the result is CONTAINS (preferred) or WITHIN.

        Specified by:
        relate in interface Shape
      • getYAxis

        protected double getYAxis()
        The Y coordinate of where the circle axis intersect.
      • getXAxis

        protected double getXAxis()
        The X coordinate of where the circle axis intersect.
      • equals

        public boolean equals​(Object obj)
        Description copied from interface: Shape
        The sub-classes of Shape generally implement the same contract for Object.equals(Object) and Object.hashCode() amongst the same sub-interface type. This means, for example, that multiple Point implementations of different classes are equal if they share the same x & y.
        Specified by:
        equals in interface Shape
        Overrides:
        equals in class Object
      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class Object