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/*
* Copyright (C) 2007 The Android Open Source Project
*
* 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.
*/
package android.util;
/**
* Math routines similar to those found in {@link java.lang.Math}.
*
* <p>Historically these methods were faster than the equivalent double-based
* {@link java.lang.Math} methods. On versions of Android with a JIT they
* became slower and have since been re-implemented to wrap calls to
* {@link java.lang.Math}. {@link java.lang.Math} should be used in
* preference.
*/
public class FloatMath {
/** Prevents instantiation. */
private FloatMath() {}
/**
* Returns the float conversion of the most positive (i.e. closest to
* positive infinity) integer value which is less than the argument.
*
* @param value to be converted
* @return the floor of value
*/
public static float floor(float value) {
return (float) Math.floor(value);
}
/**
* Returns the float conversion of the most negative (i.e. closest to
* negative infinity) integer value which is greater than the argument.
*
* @param value to be converted
* @return the ceiling of value
*/
public static float ceil(float value) {
return (float) Math.ceil(value);
}
/**
* Returns the closest float approximation of the sine of the argument.
*
* @param angle to compute the cosine of, in radians
* @return the sine of angle
*/
public static float sin(float angle) {
return (float) Math.sin(angle);
}
/**
* Returns the closest float approximation of the cosine of the argument.
*
* @param angle to compute the cosine of, in radians
* @return the cosine of angle
*/
public static float cos(float angle) {
return (float) Math.cos(angle);
}
/**
* Returns the closest float approximation of the square root of the
* argument.
*
* @param value to compute sqrt of
* @return the square root of value
*/
public static float sqrt(float value) {
return (float) Math.sqrt(value);
}
/**
* Returns the closest float approximation of the raising "e" to the power
* of the argument.
*
* @param value to compute the exponential of
* @return the exponential of value
*/
public static float exp(float value) {
return (float) Math.exp(value);
}
/**
* Returns the closest float approximation of the result of raising {@code
* x} to the power of {@code y}.
*
* @param x the base of the operation.
* @param y the exponent of the operation.
* @return {@code x} to the power of {@code y}.
*/
public static float pow(float x, float y) {
return (float) Math.pow(x, y);
}
/**
* Returns {@code sqrt(}<i>{@code x}</i><sup>{@code 2}</sup>{@code +} <i>
* {@code y}</i><sup>{@code 2}</sup>{@code )}.
*
* @param x a float number
* @param y a float number
* @return the hypotenuse
*/
public static float hypot(float x, float y) {
return (float) Math.hypot(x, y);
}
}
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