| /* |
| * 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}. On |
| * versions of Android with a JIT, these are significantly slower than |
| * the equivalent {@code Math} functions, which should be used in preference |
| * to these. |
| */ |
| 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); |
| |
| /** |
| * 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 native float exp(float 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 native float pow(float x, float 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 native float hypot(float x, float y); |
| } |