/*
* 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.google.zxing.qrcode.detector;
import com.google.zxing.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 <= 1.0f;
}
return false;
}
}
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