content: /*
   *  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
   *
   *      https://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.tools.ant.types.optional.image;
  
  import java.awt.image.BufferedImage;
  import java.awt.image.renderable.ParameterBlock;
  
  import javax.media.jai.InterpolationNearest;
  import javax.media.jai.JAI;
  import javax.media.jai.PlanarImage;
  
  /**
   * ImageOperation to rotate an image by a certain degree
   *
   * @see org.apache.tools.ant.taskdefs.optional.image.Image
   */
  public class Rotate extends TransformOperation implements DrawOperation {
      private static final float HALF_CIRCLE = 180.0F;
  
      // CheckStyle:VisibilityModifier OFF - bc
      protected float angle = 0.0F;
      // CheckStyle:VisibilityModifier ON
  
      /**
       * Sets the angle of rotation in degrees.
       * @param ang The angle at which to rotate the image
       */
      public void setAngle(String ang) {
          angle = Float.parseFloat(ang);
      }
  
  
      /**
       * Rotate an image.
       * @param image the image to rotate.
       * @return the rotated image.
       */
      public PlanarImage performRotate(PlanarImage image) {
          float tAngle = (float) (angle * (Math.PI / HALF_CIRCLE));
          ParameterBlock pb = new ParameterBlock();
          pb.addSource(image);
          pb.add(0.0F);
          pb.add(0.0F);
          pb.add(tAngle);
          pb.add(new InterpolationNearest());
          return JAI.create("Rotate", pb, null);
      }
  
  
      /**
       * Performs the image rotation when being handled as a TransformOperation.
       * @param image The image to perform the transformation on.
       * @return the transformed image.
       */
      @Override
      public PlanarImage executeTransformOperation(PlanarImage image) {
          for (ImageOperation instr : instructions) {
              if (instr instanceof DrawOperation) {
                  // If this TransformOperation has DrawOperation children
                  // then Rotate the first child and return.
                  System.out.println("Exec'ing Draws");
                  PlanarImage op = ((DrawOperation) instr).executeDrawOperation();
                  return performRotate(op);
              }
              if (instr instanceof TransformOperation) {
                  BufferedImage bi = image.getAsBufferedImage();
                  System.out.println("Exec'ing Transforms");
                  image = ((TransformOperation) instr)
                      .executeTransformOperation(PlanarImage.wrapRenderedImage(bi));
              }
          }
          System.out.println("Exec'ing as TransformOperation");
          image = performRotate(image);
          System.out.println(image);
          return image;
      }
  
      /**
       *  Performs the image rotation when being handled as a DrawOperation.
       *  It absolutely requires that there be a DrawOperation nested beneath it,
       *  but only the FIRST DrawOperation will be handled since it can only return
       *  ONE image.
       * @return the image.
       */
      @Override
      public PlanarImage executeDrawOperation() {
          for (ImageOperation instr : instructions) {
              if (instr instanceof DrawOperation) {
                  // If this TransformOperation has DrawOperation children
                  // then Rotate the first child and return.
                  PlanarImage op = ((DrawOperation) instr).executeDrawOperation();
                  return performRotate(op);
              }
          }
          return null;
      }
  
  }
  