75 lines
2.3 KiB
Java
75 lines
2.3 KiB
Java
|
/*
|
||
|
|
* 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}. Performs
|
||
|
|
* computations on {@code float} values directly without incurring the overhead
|
||
|
|
* of conversions to and from {@code double}.
|
||
|
|
*
|
||
|
|
* <p>On one platform, {@code FloatMath.sqrt(100)} executes in one third of the
|
||
|
|
* time required by {@code java.lang.Math.sqrt(100)}.</p>
|
||
|
|
*/
|
||
|
|
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 native float floor(float 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 native float ceil(float 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 native float sin(float 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 native float cos(float 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 native float sqrt(float value);
|
||
|
|
}
|