sviolet.thistle.util.math.MathUtils Maven / Gradle / Ivy
/*
* Copyright (C) 2015-2018 S.Violet
*
* 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.
*
* Project GitHub: https://github.com/shepherdviolet/thistle
* Email: [email protected]
*/
package sviolet.thistle.util.math;
/**
* 数学工具
*
* @author S.Violet
*/
public class MathUtils {
/*********************************************************************
* trigonometric
*/
/**
*
* 根据角度计算sin值
* Math.sin()中的参数为弧度值, 弧度值 = 角度 * PI / 180
*
*
* @param angle [0, 360]
* @return sin值 [-1, 1]
*/
public static double sinAngle(double angle){
return Math.sin(angle * Math.PI / 180);
}
/**
*
* 根据sin值计算角度
* Math.asin()返回值为弧度值, 弧度值 = 角度 * PI / 180
*
*
* @param sin sin值 [-1, 1]
* @return 角度 [0, 360]
*/
public static double asinAngle(double sin){
return Math.asin(sin) / (Math.PI / 180);
}
/**
*
* 根据角度计算tan值
* Math.tan()中的参数为弧度值, 弧度值 = 角度 * PI / 180
*
*
* @param angle [0, 360]
* @return tan值
*/
public static double tanAngle(double angle){
return Math.tan(angle * Math.PI / 180);
}
/**
*
* 根据tan值计算角度
* Math.atan()返回值为弧度值, 弧度值 = 角度 * PI / 180
*
*
* @param tan tan值
* @return 角度 [0, 360]
*/
public static double atanAngle(double tan){
return Math.atan(tan) / (Math.PI / 180);
}
/************************************************************************************
* other
*/
/**
* 角度转为弧度(rad)
*/
public static double rad(double degrees) {
return degrees * Math.PI / 180.0;
}
/**
* 角度标准化, 将任意不在0-360范围内的角度转换为0-360范围内的角度, 例如:-90 -> 270
* @param angle 角度
* @return 0-360范围的角度
*/
public static float standardizeAngle(float angle){
float m = angle % 360;
return m > 0 ? m : m + 360;
}
/**
* 判断数字是否为2的幂次, 例如1 2 4 8 16 ... 512 1024 ... (0 返回 false)
* @param value 数字
* @return true:为2的幂次
*/
public static boolean isPowerOfTwo(int value){
return value > 0 && (value & value - 1) == 0;
}
}