/*
* 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.util.operator;
import java.io.IOException;
import java.util.List;
import org.apache.pdfbox.cos.COSNumber;
import org.apache.pdfbox.pdfviewer.PageDrawer;
import org.apache.pdfbox.pdmodel.graphics.color.PDColorSpace;
import org.apache.pdfbox.pdmodel.graphics.color.PDColorState;
import org.apache.pdfbox.pdmodel.graphics.color.PDDeviceGray;
import org.apache.pdfbox.util.PDFOperator;
/**
* <p>Structal modification of the PDFEngine class :
* the long sequence of conditions in processOperator is remplaced by
* this strategy pattern.</p>
*
* @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
* @version $Revision: 1.1 $
*/
public class SetStrokingGrayColor extends OperatorProcessor
{
/**
* RG Set color space for stroking operations.
* @param operator The operator that is being executed.
* @param arguments List
* @throws IOException If an error occurs while processing the font.
*/
public void process(PDFOperator operator, List arguments) throws IOException
{
PDColorState color = context.getGraphicsState().getStrokingColor();
color.setColorSpace( new PDDeviceGray() );
float[] values = new float[1];
if( arguments.size() >= 1 )
{
values[0] = ((COSNumber)arguments.get( 0 )).floatValue();
}
else
{
throw new IOException( "Error: Expected at least one argument when setting non stroking gray color");
}
color.setColorSpaceValue( values );
if (context instanceof PageDrawer)
{
PageDrawer drawer = (PageDrawer)context;
drawer.colorChanged(true);
}
}
}