# FDFAnnotationPolygon.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.fdf;

    import java.awt.Color;
    import java.io.IOException;

    import javax.xml.xpath.XPath;
    import javax.xml.xpath.XPathExpressionException;
    import javax.xml.xpath.XPathFactory;

    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.pdfbox.cos.COSArray;
    import org.apache.pdfbox.cos.COSDictionary;
    import org.apache.pdfbox.cos.COSName;
    import org.w3c.dom.Element;

    /**
     * This represents a Polygon FDF annotation.
     *
     * @author Ben Litchfield
     * @author Johanneke Lamberink
     */
    public class FDFAnnotationPolygon extends FDFAnnotation
    {
        private static final Log LOG = LogFactory.getLog(FDFAnnotationPolygon.class);
        /**
         * COS Model value for SubType entry.
         */
        public static final String SUBTYPE = "Polygon";

        /**
         * Default constructor.
         */
        public FDFAnnotationPolygon()
        {
            super();
            annot.setName(COSName.SUBTYPE, SUBTYPE);
        }

        /**
         * Constructor.
         *
         * @param a An existing FDF Annotation.
         */
        public FDFAnnotationPolygon(COSDictionary a)
        {
            super(a);
        }

        /**
         * Constructor.
         *
         * @param element An XFDF element.
         *
         * @throws IOException If there is an error extracting information from the element.
         */
        public FDFAnnotationPolygon(Element element) throws IOException
        {
            super(element);
            annot.setName(COSName.SUBTYPE, SUBTYPE);

            initVertices(element);
            String color = element.getAttribute("interior-color");
            if (color != null && color.length() == 7 && color.charAt(0) == '#')
            {
                int colorValue = Integer.parseInt(color.substring(1, 7), 16);
                setInteriorColor(new Color(colorValue));
            }
        }

        private void initVertices(Element element) throws IOException
        {
            XPath xpath = XPathFactory.newInstance().newXPath();
            try
            {
                String vertices = xpath.evaluate("vertices", element);
                if (vertices == null || vertices.isEmpty())
                {
                    throw new IOException("Error: missing element 'vertices'");
                }
                String[] verticesValues = vertices.split(",|;");
                float[] values = new float[verticesValues.length];
                for (int i = 0; i < verticesValues.length; i++)
                {
                    values[i] = Float.parseFloat(verticesValues[i]);
                }
                setVertices(values);
            }
            catch (XPathExpressionException e)
            {
                LOG.debug("Error while evaluating XPath expression for polygon vertices", e);
            }
        }

        /**
         * This will set the coordinates of the vertices.
         *
         * @param vertices array of floats [x1, y1, x2, y2, ...] vertex coordinates in default user space.
         */
        public final void setVertices(float[] vertices)
        {
            COSArray newVertices = new COSArray();
            newVertices.setFloatArray(vertices);
            annot.setItem(COSName.VERTICES, newVertices);
        }

        /**
         * This will get the coordinates of the vertices.
         *
         * @return array of floats [x1, y1, x2, y2, ...] vertex coordinates in default user space.
         */
        public float[] getVertices()
        {
            COSArray array = annot.getCOSArray(COSName.VERTICES);
            return array != null ? array.toFloatArray() : null;
        }

        /**
         * This will set interior color of the drawn area.
         *
         * @param color The interior color of the drawn area.
         */
        public final void setInteriorColor(Color color)
        {
            COSArray array = null;
            if (color != null)
            {
                float[] colors = color.getRGBColorComponents(null);
                array = new COSArray();
                array.setFloatArray(colors);
            }
            annot.setItem(COSName.IC, array);
        }

        /**
         * This will get interior color of the drawn area.
         *
         * @return object representing the color.
         */
        public Color getInteriorColor()
        {
            Color retval = null;
            COSArray array = annot.getCOSArray(COSName.IC);
            if (array != null)
            {
                float[] rgb = array.toFloatArray();
                if (rgb.length >= 3)
                {
                    retval = new Color(rgb[0], rgb[1], rgb[2]);
                }
            }
            return retval;
        }
    }