47 lines
1.4 KiB
PHP
47 lines
1.4 KiB
PHP
<?php
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/*
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* Copyright 2012 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 Zxing\Common\Detector;
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final class MathUtils {
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private function __construct() {
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}
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/**
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* Ends up being a bit faster than {@link Math#round(float)}. This merely rounds its
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* argument to the nearest int, where x.5 rounds up to x+1. Semantics of this shortcut
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* differ slightly from {@link Math#round(float)} in that half rounds down for negative
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* values. -2.5 rounds to -3, not -2. For purposes here it makes no difference.
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*
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* @param d real value to round
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* @return nearest {@code int}
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*/
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public static function round($d) {
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return (int) ($d + ($d < 0.0 ? -0.5 : 0.5));
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}
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public static function distance($aX, $aY, $bX, $bY) {
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$xDiff = $aX - $bX;
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$yDiff = $aY - $bY;
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return (float) sqrt($xDiff * $xDiff + $yDiff * $yDiff);
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}
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}
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