19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.util; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 20f732a2f83f43769653f9dc5975faf1d6d0bd19f6Elliott Hughes * Math routines similar to those found in {@link java.lang.Math}. On 21f732a2f83f43769653f9dc5975faf1d6d0bd19f6Elliott Hughes * versions of Android with a JIT, these are significantly slower than 22f732a2f83f43769653f9dc5975faf1d6d0bd19f6Elliott Hughes * the equivalent {@code Math} functions, which should be used in preference 23f732a2f83f43769653f9dc5975faf1d6d0bd19f6Elliott Hughes * to these. 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class FloatMath { 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** Prevents instantiation. */ 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private FloatMath() {} 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the float conversion of the most positive (i.e. closest to 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * positive infinity) integer value which is less than the argument. 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param value to be converted 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the floor of value 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static native float floor(float value); 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the float conversion of the most negative (i.e. closest to 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * negative infinity) integer value which is greater than the argument. 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param value to be converted 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the ceiling of value 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static native float ceil(float value); 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the closest float approximation of the sine of the argument. 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param angle to compute the cosine of, in radians 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the sine of angle 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static native float sin(float angle); 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the closest float approximation of the cosine of the argument. 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param angle to compute the cosine of, in radians 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the cosine of angle 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static native float cos(float angle); 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the closest float approximation of the square root of the 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * argument. 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param value to compute sqrt of 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the square root of value 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static native float sqrt(float value); 725d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown 735d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown /** 745d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown * Returns the closest float approximation of the raising "e" to the power 755d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown * of the argument. 765d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown * 775d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown * @param value to compute the exponential of 785d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown * @return the exponential of value 795d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown */ 805d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown public static native float exp(float value); 81270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown 82270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown /** 83e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown * Returns the closest float approximation of the result of raising {@code 84e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown * x} to the power of {@code y}. 85e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown * 86e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown * @param x the base of the operation. 87e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown * @param y the exponent of the operation. 88e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown * @return {@code x} to the power of {@code y}. 89e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown */ 90e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown public static native float pow(float x, float y); 91e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown 92e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown /** 93270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown * Returns {@code sqrt(}<i>{@code x}</i><sup>{@code 2}</sup>{@code +} <i> 94270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown * {@code y}</i><sup>{@code 2}</sup>{@code )}. 95270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown * 96270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown * @param x a float number 97270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown * @param y a float number 98270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown * @return the hypotenuse 99270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown */ 100270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown public static native float hypot(float x, float y); 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 102