# PDTransitionDirection.java

    /*
     * Licensed to the Apache Software Foundation (ASF) under one or more
     * contributor license agreements.  See the NOTICE file distributed with
     * this work for additional information regarding copyright ownership.
     * The ASF licenses this file to You under the Apache License, Version 2.0
     * (the "License"); you may not use this file except in compliance with
     * the License.  You may obtain a copy of the License at
     *
     *      http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    package org.apache.pdfbox.pdmodel.interactive.pagenavigation;

    import org.apache.pdfbox.cos.COSBase;
    import org.apache.pdfbox.cos.COSInteger;
    import org.apache.pdfbox.cos.COSName;

    /**
     * The direction in which the specified transition effect shall moves, expressed in degrees counterclockwise starting
     * from a left-to-right direction. Only for {@link PDTransitionStyle#Wipe}, {@link PDTransitionStyle#Glitter},
     * {@link PDTransitionStyle#Fly}, {@link PDTransitionStyle#Cover}, {@link PDTransitionStyle#Uncover} and
     * {@link PDTransitionStyle#Push}.
     *
     * @author Andrea Vacondio
     *
     */
    public enum PDTransitionDirection
    {
        LEFT_TO_RIGHT(0),
        /**
         * Relevant only for the Wipe transition
         */
        BOTTOM_TO_TOP(90),
        /**
         * Relevant only for the Wipe transition
         */
        RIGHT_TO_LEFT(180), TOP_TO_BOTTOM(270),
        /**
         * Relevant only for the Glitter transition
         */
        TOP_LEFT_TO_BOTTOM_RIGHT(315),
        /**
         * Relevant only for the Fly transition when the value of SS is not 1.0
         */
        NONE(0)
        {
            @Override
            public COSBase getCOSBase()
            {
                return COSName.NONE;
            }
        };

        private final int degrees;

        private PDTransitionDirection(int degrees)
        {
            this.degrees = degrees;
        }

        /**
         * @return the value for this direction
         */
        public COSBase getCOSBase()
        {
            return COSInteger.get(degrees);
        }
    }