Android Open Source - zmap I Ring

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Back to project page zmap.

License

The source code is released under:

GNU Lesser General Public License

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Java Source Code

package com.zmap.geom;
//from  w  w  w  . ja v a  2s. co m
/**
 * @note An IRing is a single polygon consist of a sequence of coordinates.
 * An IRing should be closed and simple, closed means that the last coordinate
 * should equal to the last one, simple means that any segment should not
 * intersect with others.
 *
 * We say an IRing is invalid, if it is not closed or not simple, ant thus some
 * of its operation may return invalid value (eg., area() returns Double.NaN) or
 * throw InvalidGeometryException.
 */
public interface IRing
{
    /**
     * @note Get area of the ring. Returns Double.NaN if invalid.
     */
    public double area();

    /**
     * @note Get perimeter of the ring. Returns Double.NaN if invalid.
     */
    public double perimeter();

    /**
     * @note Try close the ring.
     */
    public void close();

    /**
     * @note Check whether the ring is closed.
     */
    public boolean isClosed();

    /**
     * @note Check whether the ring is simple.
     */
    public boolean isSimple();
}

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