content: /*
   * Copyright 2007 ZXing authors
   *
   * Licensed 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 com.ailiwean.core.zxing.core.qrcode.detector;
  
  
  import com.ailiwean.core.zxing.core.ResultPoint;
  
  /**
   * <p>Encapsulates an alignment pattern, which are the smaller square patterns found in
   * all but the simplest QR Codes.</p>
   *
   * @author Sean Owen
   */
  public final class AlignmentPattern extends ResultPoint {
  
    private final float estimatedModuleSize;
  
    AlignmentPattern(float posX, float posY, float estimatedModuleSize) {
      super(posX, posY);
      this.estimatedModuleSize = estimatedModuleSize;
    }
  
    /**
     * <p>Determines if this alignment pattern "about equals" an alignment pattern at the stated
     * position and size -- meaning, it is at nearly the same center with nearly the same size.</p>
     */
    boolean aboutEquals(float moduleSize, float i, float j) {
      if (Math.abs(i - getY()) <= moduleSize && Math.abs(j - getX()) <= moduleSize) {
        float moduleSizeDiff = Math.abs(moduleSize - estimatedModuleSize);
        return moduleSizeDiff <= 1.0f || moduleSizeDiff <= estimatedModuleSize;
      }
      return false;
    }
  
    /**
     * Combines this object's current estimate of a finder pattern position and module size
     * with a new estimate. It returns a new {@code FinderPattern} containing an average of the two.
     */
    AlignmentPattern combineEstimate(float i, float j, float newModuleSize) {
      float combinedX = (getX() + j) / 2.0f;
      float combinedY = (getY() + i) / 2.0f;
      float combinedModuleSize = (estimatedModuleSize + newModuleSize) / 2.0f;
      return new AlignmentPattern(combinedX, combinedY, combinedModuleSize);
    }
  
  }