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/** 207b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich * Math routines similar to those found in {@link java.lang.Math}. 217b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich * 227b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich * <p>Historically these methods were faster than the equivalent double-based 237b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich * {@link java.lang.Math} methods. On versions of Android with a JIT they 247b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich * became slower and have since been re-implemented to wrap calls to 257b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich * {@link java.lang.Math}. {@link java.lang.Math} should be used in 267b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich * preference. 27bbf8871e1c7ef762b3f9505cca924568c48e8be5Neil Fuller * 28d6a213526251896b7f9928334a17ae0dd97669baNeil Fuller * <p>All methods were removed from the public API in version 23. 29d6a213526251896b7f9928334a17ae0dd97669baNeil Fuller * 30bbf8871e1c7ef762b3f9505cca924568c48e8be5Neil Fuller * @deprecated Use {@link java.lang.Math} instead. 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 32bbf8871e1c7ef762b3f9505cca924568c48e8be5Neil Fuller@Deprecated 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class FloatMath { 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** Prevents instantiation. */ 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private FloatMath() {} 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the float conversion of the most positive (i.e. closest to 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * positive infinity) integer value which is less than the argument. 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param value to be converted 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the floor of value 44d6a213526251896b7f9928334a17ae0dd97669baNeil Fuller * @removed 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 467b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich public static float floor(float value) { 477b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich return (float) Math.floor(value); 487b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich } 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the float conversion of the most negative (i.e. closest to 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * negative infinity) integer value which is greater than the argument. 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param value to be converted 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the ceiling of value 56d6a213526251896b7f9928334a17ae0dd97669baNeil Fuller * @removed 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 587b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich public static float ceil(float value) { 597b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich return (float) Math.ceil(value); 607b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich } 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the closest float approximation of the sine of the argument. 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param angle to compute the cosine of, in radians 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the sine of angle 67d6a213526251896b7f9928334a17ae0dd97669baNeil Fuller * @removed 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 697b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich public static float sin(float angle) { 707b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich return (float) Math.sin(angle); 717b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich } 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the closest float approximation of the cosine of the argument. 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param angle to compute the cosine of, in radians 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the cosine of angle 78d6a213526251896b7f9928334a17ae0dd97669baNeil Fuller * @removed 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 807b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich public static float cos(float angle) { 817b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich return (float) Math.cos(angle); 827b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich } 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the closest float approximation of the square root of the 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * argument. 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param value to compute sqrt of 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the square root of value 90d6a213526251896b7f9928334a17ae0dd97669baNeil Fuller * @removed 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 927b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich public static float sqrt(float value) { 937b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich return (float) Math.sqrt(value); 947b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich } 955d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown 965d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown /** 975d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown * Returns the closest float approximation of the raising "e" to the power 985d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown * of the argument. 995d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown * 1005d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown * @param value to compute the exponential of 1015d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown * @return the exponential of value 102d6a213526251896b7f9928334a17ae0dd97669baNeil Fuller * @removed 1035d728bb9ff8c6ad89d5a1b88b2804f954d45d763Jeff Brown */ 1047b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich public static float exp(float value) { 1057b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich return (float) Math.exp(value); 1067b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich } 107270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown 108270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown /** 109e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown * Returns the closest float approximation of the result of raising {@code 110e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown * x} to the power of {@code y}. 111e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown * 112e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown * @param x the base of the operation. 113e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown * @param y the exponent of the operation. 114e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown * @return {@code x} to the power of {@code y}. 115d6a213526251896b7f9928334a17ae0dd97669baNeil Fuller * @removed 116e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown */ 1177b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich public static float pow(float x, float y) { 1187b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich return (float) Math.pow(x, y); 1197b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich } 120e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown 121e2c279e8a1abc2cc7bc87b94a514a563b814cdc1Jeff Brown /** 122270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown * Returns {@code sqrt(}<i>{@code x}</i><sup>{@code 2}</sup>{@code +} <i> 123270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown * {@code y}</i><sup>{@code 2}</sup>{@code )}. 124270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown * 125270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown * @param x a float number 126270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown * @param y a float number 127270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown * @return the hypotenuse 128d6a213526251896b7f9928334a17ae0dd97669baNeil Fuller * @removed 129270e3381e7053c3b15aa8f508c9df9d98032cd62Jeff Brown */ 1307b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich public static float hypot(float x, float y) { 1317b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich return (float) Math.hypot(x, y); 1327b3db39aa47108c87dad5e930b6fec2292219abeNick Kralevich } 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 134