http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
/*
 * 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.
 */

/* $Id: Viewport.java 1081554 2011-03-14 20:46:03Z vhennebert $ */

package org.apache.fop.area;

import java.awt.Rectangle;


A viewport-area that may clip its content.

/**
 * A viewport-area that may clip its content.
 */
public interface Viewport {

    
Returns true if this area will clip overflowing content.

Returns:true if the overflow trait has the value "hidden", "scroll" or "error-if-overflow"
/**
     * Returns true if this area will clip overflowing content.
     *
     * @return {@code true} if the overflow trait has the value "hidden", "scroll" or
     * "error-if-overflow"
     */
    boolean hasClip();

    
Returns the clipping rectangle of this viewport area.

Returns:the clipping rectangle expressed in the viewport's coordinate system, or
null if clipping is disabled
/**
     * Returns the clipping rectangle of this viewport area.
     *
     * @return the clipping rectangle expressed in the viewport's coordinate system, or
     * null if clipping is disabled
     */
    Rectangle getClipRectangle();
}