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      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