# LineTo.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.contentstream.operator.graphics;

    import java.io.IOException;
    import java.util.List;
    import java.awt.geom.Point2D;

    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.pdfbox.contentstream.operator.MissingOperandException;
    import org.apache.pdfbox.cos.COSBase;
    import org.apache.pdfbox.cos.COSNumber;
    import org.apache.pdfbox.contentstream.operator.Operator;
    import org.apache.pdfbox.contentstream.operator.OperatorName;

    /**
     * l Append straight line segment to path.
     *
     * @author Ben Litchfield
     */
    public class LineTo extends GraphicsOperatorProcessor
    {
        private static final Log LOG = LogFactory.getLog(LineTo.class);

        @Override
        public void process(Operator operator, List<COSBase> operands) throws IOException
        {
            if (operands.size() < 2)
            {
                throw new MissingOperandException(operator, operands);
            }
            COSBase base0 = operands.get(0);
            if (!(base0 instanceof COSNumber))
            {
                return;
            }
            COSBase base1 = operands.get(1);
            if (!(base1 instanceof COSNumber))
            {
                return;
            }
            // append straight line segment from the current point to the point
            COSNumber x = (COSNumber) base0;
            COSNumber y = (COSNumber) base1;

            Point2D.Float pos = context.transformedPoint(x.floatValue(), y.floatValue());

            if (context.getCurrentPoint() == null)
            {
                LOG.warn("LineTo (" + pos.x + "," + pos.y + ") without initial MoveTo");
                context.moveTo(pos.x, pos.y);
            }
            else
            {
                context.lineTo(pos.x, pos.y);
            }
        }

        @Override
        public String getName()
        {
            return OperatorName.LINE_TO;
        }
    }