@zxing/library
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TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
51 lines (50 loc) • 2.22 kB
JavaScript
/*
* 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.
*/
/*namespace com.google.zxing.qrcode.detector {*/
import ResultPoint from '../../ResultPoint';
/**
* <p>Encapsulates an alignment pattern, which are the smaller square patterns found in
* all but the simplest QR Codes.</p>
*
* @author Sean Owen
*/
export default class AlignmentPattern extends ResultPoint {
constructor(posX /*float*/, posY /*float*/, estimatedModuleSize /*float*/) {
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>
*/
aboutEquals(moduleSize /*float*/, i /*float*/, j /*float*/) {
if (Math.abs(i - this.getY()) <= moduleSize && Math.abs(j - this.getX()) <= moduleSize) {
const moduleSizeDiff = Math.abs(moduleSize - this.estimatedModuleSize);
return moduleSizeDiff <= 1.0 || moduleSizeDiff <= this.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.
*/
combineEstimate(i /*float*/, j /*float*/, newModuleSize /*float*/) {
const combinedX = (this.getX() + j) / 2.0;
const combinedY = (this.getY() + i) / 2.0;
const combinedModuleSize = (this.estimatedModuleSize + newModuleSize) / 2.0;
return new AlignmentPattern(combinedX, combinedY, combinedModuleSize);
}
}