/*
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* Copyright 2007 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*namespace com.google.zxing.qrcode.detector {*/
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import ResultPoint from '../../ResultPoint';
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/**
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* <p>Encapsulates a finder pattern, which are the three square patterns found in
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* the corners of QR Codes. It also encapsulates a count of similar finder patterns,
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* as a convenience to the finder's bookkeeping.</p>
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*
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* @author Sean Owen
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*/
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export default class FinderPattern extends ResultPoint {
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// FinderPattern(posX: number/*float*/, posY: number/*float*/, estimatedModuleSize: number/*float*/) {
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// this(posX, posY, estimatedModuleSize, 1)
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// }
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constructor(posX /*float*/, posY /*float*/, estimatedModuleSize /*float*/, count /*int*/) {
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super(posX, posY);
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this.estimatedModuleSize = estimatedModuleSize;
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this.count = count;
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if (undefined === count) {
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this.count = 1;
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}
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}
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getEstimatedModuleSize() {
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return this.estimatedModuleSize;
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}
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getCount() {
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return this.count;
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}
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/*
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void incrementCount() {
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this.count++
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}
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*/
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/**
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* <p>Determines if this finder pattern "about equals" a finder pattern at the stated
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* position and size -- meaning, it is at nearly the same center with nearly the same size.</p>
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*/
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aboutEquals(moduleSize /*float*/, i /*float*/, j /*float*/) {
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if (Math.abs(i - this.getY()) <= moduleSize && Math.abs(j - this.getX()) <= moduleSize) {
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const moduleSizeDiff = Math.abs(moduleSize - this.estimatedModuleSize);
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return moduleSizeDiff <= 1.0 || moduleSizeDiff <= this.estimatedModuleSize;
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}
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return false;
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}
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/**
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* Combines this object's current estimate of a finder pattern position and module size
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* with a new estimate. It returns a new {@code FinderPattern} containing a weighted average
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* based on count.
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*/
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combineEstimate(i /*float*/, j /*float*/, newModuleSize /*float*/) {
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const combinedCount = this.count + 1;
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const combinedX = (this.count * this.getX() + j) / combinedCount;
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const combinedY = (this.count * this.getY() + i) / combinedCount;
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const combinedModuleSize = (this.count * this.estimatedModuleSize + newModuleSize) / combinedCount;
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return new FinderPattern(combinedX, combinedY, combinedModuleSize, combinedCount);
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}
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}
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