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

    /**
     * re Appends a rectangle to the path.
     *
     * @author Ben Litchfield
     */
    public final class AppendRectangleToPath extends GraphicsOperatorProcessor
    {
        @Override
        public void process(Operator operator, List<COSBase> operands) throws IOException
        {
            if (operands.size() < 4)
            {
                throw new MissingOperandException(operator, operands);
            }
            if (!checkArrayTypesClass(operands, COSNumber.class))
            {
                return;
            }
            COSNumber x = (COSNumber) operands.get(0);
            COSNumber y = (COSNumber) operands.get(1);
            COSNumber w = (COSNumber) operands.get(2);
            COSNumber h = (COSNumber) operands.get(3);

            float x1 = x.floatValue();
            float y1 = y.floatValue();

            // create a pair of coordinates for the transformation
            float x2 = w.floatValue() + x1;
            float y2 = h.floatValue() + y1;

            Point2D p0 = context.transformedPoint(x1, y1);
            Point2D p1 = context.transformedPoint(x2, y1);
            Point2D p2 = context.transformedPoint(x2, y2);
            Point2D p3 = context.transformedPoint(x1, y2);

            context.appendRectangle(p0, p1, p2, p3);
        }

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