1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.inputmethod.latin.utils; 18 19 import java.util.Arrays; 20 21 public final class CoordinateUtils { 22 private static final int INDEX_X = 0; 23 private static final int INDEX_Y = 1; 24 private static final int ELEMENT_SIZE = INDEX_Y + 1; 25 26 private CoordinateUtils() { 27 // This utility class is not publicly instantiable. 28 } 29 30 public static int[] newInstance() { 31 return new int[ELEMENT_SIZE]; 32 } 33 34 public static int x(final int[] coords) { 35 return coords[INDEX_X]; 36 } 37 38 public static int y(final int[] coords) { 39 return coords[INDEX_Y]; 40 } 41 42 public static void set(final int[] coords, final int x, final int y) { 43 coords[INDEX_X] = x; 44 coords[INDEX_Y] = y; 45 } 46 47 public static void copy(final int[] destination, final int[] source) { 48 destination[INDEX_X] = source[INDEX_X]; 49 destination[INDEX_Y] = source[INDEX_Y]; 50 } 51 52 public static int[] newCoordinateArray(final int arraySize) { 53 return new int[ELEMENT_SIZE * arraySize]; 54 } 55 56 public static int[] newCoordinateArray(final int arraySize, 57 final int defaultX, final int defaultY) { 58 final int[] result = new int[ELEMENT_SIZE * arraySize]; 59 for (int i = 0; i < arraySize; ++i) { 60 setXYInArray(result, i, defaultX, defaultY); 61 } 62 return result; 63 } 64 65 public static int xFromArray(final int[] coordsArray, final int index) { 66 return coordsArray[ELEMENT_SIZE * index + INDEX_X]; 67 } 68 69 public static int yFromArray(final int[] coordsArray, final int index) { 70 return coordsArray[ELEMENT_SIZE * index + INDEX_Y]; 71 } 72 73 public static int[] coordinateFromArray(final int[] coordsArray, final int index) { 74 final int baseIndex = ELEMENT_SIZE * index; 75 return Arrays.copyOfRange(coordsArray, baseIndex, baseIndex + ELEMENT_SIZE); 76 } 77 78 public static void setXYInArray(final int[] coordsArray, final int index, 79 final int x, final int y) { 80 final int baseIndex = ELEMENT_SIZE * index; 81 coordsArray[baseIndex + INDEX_X] = x; 82 coordsArray[baseIndex + INDEX_Y] = y; 83 } 84 85 public static void setCoordinateInArray(final int[] coordsArray, final int index, 86 final int[] coords) { 87 final int baseIndex = ELEMENT_SIZE * index; 88 coordsArray[baseIndex + INDEX_X] = coords[INDEX_X]; 89 coordsArray[baseIndex + INDEX_Y] = coords[INDEX_Y]; 90 } 91 } 92