org.apache.pdfbox.pdfviewer.PDFPagePanel Maven / Gradle / Ivy
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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.pdfviewer;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.io.IOException;
import javax.swing.JPanel;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
/**
* This is a simple JPanel that can be used to display a PDF page.
*
* @author Ben Litchfield
* @version $Revision: 1.4 $
*/
public class PDFPagePanel extends JPanel
{
private static final long serialVersionUID = -4629033339560890669L;
private PDPage page;
private PageDrawer drawer = null;
private Dimension pageDimension = null;
private Dimension drawDimension = null;
/**
* Constructor.
*
* @throws IOException If there is an error creating the Page drawing objects.
*/
public PDFPagePanel() throws IOException
{
drawer = new PageDrawer();
}
/**
* This will set the page that should be displayed in this panel.
*
* @param pdfPage The page to draw.
*/
public void setPage( PDPage pdfPage )
{
page = pdfPage;
PDRectangle cropBox = page.findCropBox();
drawDimension = cropBox.createDimension();
if (page.findRotation() % 180 == 0)
{
pageDimension = drawDimension;
}
else
{
pageDimension = new Dimension(drawDimension.height, drawDimension.width);
}
setSize( pageDimension );
setBackground( java.awt.Color.white );
}
/**
* {@inheritDoc}
*/
@Override
public void paint(Graphics g )
{
try
{
g.setColor( getBackground() );
g.fillRect( 0, 0, getWidth(), getHeight() );
int rotationAngle = page.findRotation();
// normalize the rotation angle
while (rotationAngle < 0)
{
rotationAngle += 360;
}
while (rotationAngle >= 360)
{
rotationAngle -= 360;
}
if (rotationAngle != 0)
{
Graphics2D g2D = (Graphics2D)g;
double translateX = 0;
double translateY = 0;
switch (rotationAngle)
{
case 90:
translateX = pageDimension.getWidth();
break;
case 270:
translateY = pageDimension.getHeight();
break;
case 180:
translateX = pageDimension.getWidth();
translateY = pageDimension.getHeight();
break;
}
g2D.translate(translateX, translateY);
g2D.rotate(Math.toRadians(rotationAngle));
}
drawer.drawPage( g, page, drawDimension );
}
catch( IOException e )
{
e.printStackTrace();
}
}
}