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/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * - Neither the name of intarsys nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package de.intarsys.pdf.tools.kernel;

import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;

/**
 * Tool class for calculations regarding the PDF geometry.
 */
public class PDFGeometryTools {

  /**
   * Normalize the rotation parameter to a positive multiple of 90 between 0
   * and 270.
   * 
   * @param rotation
   * @return Normalize the rotation parameter to a positive multiple of 90
   *         between 0 and 270.
   */
  static public int normalizeRotate(int rotation) {
    rotation = rotation % 360;
    if (rotation > 0) {
      return rotation - (rotation % 90);
    } else if (rotation == 0) {
      return 0;
    } else {
      rotation = 360 + rotation;
      return rotation - (rotation % 90);
    }
  }

  /**
   * Given a transformation in user space, apply the necessary transformation
   * steps to move the origin of the coordinate system to the lower left
   * corner of <code>rect</code> after rotating it clockwise by
   * <code>rotate</code>.
   * <p>
   * <code>transform</code> is modified, <code>rect</code> is read only.
   * 
   * @param transform
   * @param rotate
   * @param rect
   */
  public static void adjustTransform(AffineTransform transform, int rotate,
      Rectangle2D rect) {
    if (rotate == 0) {
      transform.translate(-rect.getMinX(), -rect.getMinY());
    } else if (rotate == 90) {
      transform.translate(-rect.getMinY(), rect.getMaxX());
      transform.rotate(Math.toRadians(-90));
    } else if (rotate == 180) {
      transform.translate(rect.getMaxX(), rect.getMaxY());
      transform.rotate(Math.toRadians(-180));
    } else if (rotate == 270) {
      transform.translate(rect.getMaxY(), -rect.getMinX());
      transform.rotate(Math.toRadians(-270));
    } else {
      // this should not happen...
      transform.translate(-rect.getMinX(), -rect.getMinY());
    }
  }

  /**
   * Tool class cannot be instantiated.
   */
  private PDFGeometryTools() {
  }
}
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