# CurveTo.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;

    /**
     * c Append curved segment to path.
     *
     * @author Ben Litchfield
     */
    public class CurveTo extends GraphicsOperatorProcessor
    {
        private static final Log LOG = LogFactory.getLog(CurveTo.class);

        @Override
        public void process(Operator operator, List<COSBase> operands) throws IOException
        {
            if (operands.size() < 6)
            {
                throw new MissingOperandException(operator, operands);
            }
            if (!checkArrayTypesClass(operands, COSNumber.class))
            {
                return;
            }
            COSNumber x1 = (COSNumber)operands.get(0);
            COSNumber y1 = (COSNumber)operands.get(1);
            COSNumber x2 = (COSNumber)operands.get(2);
            COSNumber y2 = (COSNumber)operands.get(3);
            COSNumber x3 = (COSNumber)operands.get(4);
            COSNumber y3 = (COSNumber)operands.get(5);

            Point2D.Float point1 = context.transformedPoint(x1.floatValue(), y1.floatValue());
            Point2D.Float point2 = context.transformedPoint(x2.floatValue(), y2.floatValue());
            Point2D.Float point3 = context.transformedPoint(x3.floatValue(), y3.floatValue());

            if (context.getCurrentPoint() == null)
            {
                LOG.warn("curveTo (" + point3.x + "," + point3.y + ") without initial MoveTo");
                context.moveTo(point3.x, point3.y);
            }
            else
            {
                context.curveTo(point1.x, point1.y,
                        point2.x, point2.y,
                        point3.x, point3.y);
            }
        }

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