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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* 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");
}
}
/**
* This will set the coordinates of the the vertices.
*
* @param vertices array of floats [x1, y1, x2, y2, ...] vertex coordinates in default user space.
*/
public void setVertices(float[] vertices)
{
COSArray newVertices = new COSArray();
newVertices.setFloatArray(vertices);
annot.setItem(COSName.VERTICES, newVertices);
}
/**
* This will get the coordinates of the the vertices.
*
* @return array of floats [x1, y1, x2, y2, ...] vertex coordinates in default user space.
*/
public float[] getVertices()
{
COSArray array = (COSArray) annot.getDictionaryObject(COSName.VERTICES);
if (array != null)
{
return array.toFloatArray();
}
else
{
return null; // Should never happen as this is a required item
}
}
/**
* 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 = (COSArray) annot.getDictionaryObject(COSName.IC);
if (array != null)
{
float[] rgb = array.toFloatArray();
if (rgb.length >= 3)
{
retval = new Color(rgb[0], rgb[1], rgb[2]);
}
}
return retval;
}
}