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<?php
/*
* 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 Zxing;
use Zxing\Common\Detector\MathUtils;
/**
* <p>Encapsulates a point of interest in an image containing a barcode. Typically, this
* would be the location of a finder pattern or the corner of the barcode, for example.</p>
*
* @author Sean Owen
*/
class ResultPoint
{
private $x;
private $y;
public function __construct($x, $y)
{
$this->x = (float)($x);
$this->y = (float)($y);
}
/**
* Orders an array of three ResultPoints in an order [A,B,C] such that AB is less than AC
* and BC is less than AC, and the angle between BC and BA is less than 180 degrees.
*
* @param patterns array of three {@code ResultPoint} to order
*/
public static function orderBestPatterns($patterns)
{
// Find distances between pattern centers
$zeroOneDistance = self::distance($patterns[0], $patterns[1]);
$oneTwoDistance = self::distance($patterns[1], $patterns[2]);
$zeroTwoDistance = self::distance($patterns[0], $patterns[2]);
$pointA = '';
$pointB = '';
$pointC = '';
// Assume one closest to other two is B; A and C will just be guesses at first
if ($oneTwoDistance >= $zeroOneDistance && $oneTwoDistance >= $zeroTwoDistance) {
$pointB = $patterns[0];
$pointA = $patterns[1];
$pointC = $patterns[2];
} else if ($zeroTwoDistance >= $oneTwoDistance && $zeroTwoDistance >= $zeroOneDistance) {
$pointB = $patterns[1];
$pointA = $patterns[0];
$pointC = $patterns[2];
} else {
$pointB = $patterns[2];
$pointA = $patterns[0];
$pointC = $patterns[1];
}
// Use cross product to figure out whether A and C are correct or flipped.
// This asks whether BC x BA has a positive z component, which is the arrangement
// we want for A, B, C. If it's negative, then we've got it flipped around and
// should swap A and C.
if (self::crossProductZ($pointA, $pointB, $pointC) < 0.0) {
$temp = $pointA;
$pointA = $pointC;
$pointC = $temp;
}
$patterns[0] = $pointA;
$patterns[1] = $pointB;
$patterns[2] = $pointC;
return $patterns;
}
/**
* @param pattern1 first pattern
* @param pattern2 second pattern
*
* @return distance between two points
*/
public static function distance($pattern1, $pattern2)
{
return MathUtils::distance($pattern1->x, $pattern1->y, $pattern2->x, $pattern2->y);
}
//@Override
/**
* Returns the z component of the cross product between vectors BC and BA.
*/
private static function crossProductZ($pointA,
$pointB,
$pointC)
{
$bX = $pointB->x;
$bY = $pointB->y;
return (($pointC->x - $bX) * ($pointA->y - $bY)) - (($pointC->y - $bY) * ($pointA->x - $bX));
}
//@Override
public final function getX()
{
return (float)($this->x);
}
//@Override
public final function getY()
{
return (float)($this->y);
}
public final function equals($other)
{
if ($other instanceof ResultPoint) {
$otherPoint = $other;
return $this->x == $otherPoint->x && $this->y == $otherPoint->y;
}
return false;
}
public final function hashCode()
{
return 31 * floatToIntBits($this->x) + floatToIntBits($this->y);
}
public final function toString()
{
$result = '';
$result .= ('(');
$result .= ($this->x);
$result .= (',');
$result .= ($this->y);
$result .= (')');
return $result;
}
}
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