mirror of https://github.com/NekoX-Dev/NekoX.git
79 lines
2.3 KiB
Java
Executable File
79 lines
2.3 KiB
Java
Executable File
/*
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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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package com.google.zxing.common.detector;
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/**
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* General math-related and numeric utility functions.
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*/
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public final class MathUtils {
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private MathUtils() {
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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 int round(float d) {
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return (int) (d + (d < 0.0f ? -0.5f : 0.5f));
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}
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/**
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* @param aX point A x coordinate
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* @param aY point A y coordinate
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* @param bX point B x coordinate
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* @param bY point B y coordinate
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* @return Euclidean distance between points A and B
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*/
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public static float distance(float aX, float aY, float bX, float bY) {
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double xDiff = aX - bX;
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double yDiff = aY - bY;
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return (float) Math.sqrt(xDiff * xDiff + yDiff * yDiff);
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}
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/**
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* @param aX point A x coordinate
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* @param aY point A y coordinate
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* @param bX point B x coordinate
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* @param bY point B y coordinate
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* @return Euclidean distance between points A and B
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*/
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public static float distance(int aX, int aY, int bX, int bY) {
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double xDiff = aX - bX;
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double yDiff = aY - bY;
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return (float) Math.sqrt(xDiff * xDiff + yDiff * yDiff);
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}
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/**
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* @param array values to sum
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* @return sum of values in array
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*/
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public static int sum(int[] array) {
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int count = 0;
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for (int a : array) {
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count += a;
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}
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return count;
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}
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}
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