mirror of https://github.com/status-im/qzxing.git
101 lines
3.4 KiB
C++
101 lines
3.4 KiB
C++
/*
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* ResultPoint.cpp
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* zxing
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*
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* Created by Christian Brunschen on 13/05/2008.
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* Copyright 2008 ZXing authors All rights reserved.
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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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#include <zxing/ResultPoint.h>
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#include <math.h>
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namespace zxing {
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ResultPoint::ResultPoint() : posX_(0), posY_(0) {}
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ResultPoint::ResultPoint(float x, float y) : posX_(x), posY_(y) {}
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ResultPoint::~ResultPoint() {}
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float ResultPoint::getX() const {
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return posX_;
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}
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float ResultPoint::getY() const {
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return posY_;
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}
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bool ResultPoint::equals(Ref<ResultPoint> other) {
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return posX_ == other->getX() && posY_ == other->getY();
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}
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/**
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* <p>Orders an array of three ResultPoints in an order [A,B,C] such that AB < AC and
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* BC < AC and the angle between BC and BA is less than 180 degrees.
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*/
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void ResultPoint::orderBestPatterns(std::vector<Ref<ResultPoint> > &patterns) {
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// Find distances between pattern centers
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float zeroOneDistance = distance(patterns[0]->getX(), patterns[1]->getX(),patterns[0]->getY(), patterns[1]->getY());
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float oneTwoDistance = distance(patterns[1]->getX(), patterns[2]->getX(),patterns[1]->getY(), patterns[2]->getY());
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float zeroTwoDistance = distance(patterns[0]->getX(), patterns[2]->getX(),patterns[0]->getY(), patterns[2]->getY());
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Ref<ResultPoint> pointA, pointB, pointC;
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// Assume one closest to other two is B; A and C will just be guesses at first
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if (oneTwoDistance >= zeroOneDistance && oneTwoDistance >= zeroTwoDistance) {
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pointB = patterns[0];
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pointA = patterns[1];
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pointC = patterns[2];
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} else if (zeroTwoDistance >= oneTwoDistance && zeroTwoDistance >= zeroOneDistance) {
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pointB = patterns[1];
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pointA = patterns[0];
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pointC = patterns[2];
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} else {
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pointB = patterns[2];
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pointA = patterns[0];
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pointC = patterns[1];
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}
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// Use cross product to figure out whether A and C are correct or flipped.
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// This asks whether BC x BA has a positive z component, which is the arrangement
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// we want for A, B, C. If it's negative, then we've got it flipped around and
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// should swap A and C.
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if (crossProductZ(pointA, pointB, pointC) < 0.0f) {
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Ref<ResultPoint> temp = pointA;
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pointA = pointC;
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pointC = temp;
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}
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patterns[0] = pointA;
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patterns[1] = pointB;
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patterns[2] = pointC;
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}
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float ResultPoint::distance(Ref<ResultPoint> point1, Ref<ResultPoint> point2) {
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return distance(point1->getX(), point1->getY(), point2->getX(), point2->getY());
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}
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float ResultPoint::distance(float x1, float x2, float y1, float y2) {
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float xDiff = x1 - x2;
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float yDiff = y1 - y2;
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return (float) sqrt((double) (xDiff * xDiff + yDiff * yDiff));
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}
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float ResultPoint::crossProductZ(Ref<ResultPoint> pointA, Ref<ResultPoint> pointB, Ref<ResultPoint> pointC) {
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float bX = pointB->getX();
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float bY = pointB->getY();
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return ((pointC->getX() - bX) * (pointA->getY() - bY)) - ((pointC->getY() - bY) * (pointA->getX() - bX));
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}
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}
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