1 /* 2 * Copyright (C) 2008 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.example.android.apis.graphics.spritetext; 18 19 import javax.microedition.khronos.opengles.GL10; 20 21 import android.graphics.Paint; 22 23 public class NumericSprite { NumericSprite()24 public NumericSprite() { 25 mText = ""; 26 mLabelMaker = null; 27 } 28 initialize(GL10 gl, Paint paint)29 public void initialize(GL10 gl, Paint paint) { 30 int height = roundUpPower2((int) paint.getFontSpacing()); 31 final float interDigitGaps = 9 * 1.0f; 32 int width = roundUpPower2((int) (interDigitGaps + paint.measureText(sStrike))); 33 mLabelMaker = new LabelMaker(true, width, height); 34 mLabelMaker.initialize(gl); 35 mLabelMaker.beginAdding(gl); 36 for (int i = 0; i < 10; i++) { 37 String digit = sStrike.substring(i, i+1); 38 mLabelId[i] = mLabelMaker.add(gl, digit, paint); 39 mWidth[i] = (int) Math.ceil(mLabelMaker.getWidth(i)); 40 } 41 mLabelMaker.endAdding(gl); 42 } 43 shutdown(GL10 gl)44 public void shutdown(GL10 gl) { 45 mLabelMaker.shutdown(gl); 46 mLabelMaker = null; 47 } 48 49 /** 50 * Find the smallest power of two >= the input value. 51 * (Doesn't work for negative numbers.) 52 */ roundUpPower2(int x)53 private int roundUpPower2(int x) { 54 x = x - 1; 55 x = x | (x >> 1); 56 x = x | (x >> 2); 57 x = x | (x >> 4); 58 x = x | (x >> 8); 59 x = x | (x >>16); 60 return x + 1; 61 } 62 setValue(int value)63 public void setValue(int value) { 64 mText = format(value); 65 } 66 draw(GL10 gl, float x, float y, float viewWidth, float viewHeight)67 public void draw(GL10 gl, float x, float y, 68 float viewWidth, float viewHeight) { 69 int length = mText.length(); 70 mLabelMaker.beginDrawing(gl, viewWidth, viewHeight); 71 for(int i = 0; i < length; i++) { 72 char c = mText.charAt(i); 73 int digit = c - '0'; 74 mLabelMaker.draw(gl, x, y, mLabelId[digit]); 75 x += mWidth[digit]; 76 } 77 mLabelMaker.endDrawing(gl); 78 } 79 width()80 public float width() { 81 float width = 0.0f; 82 int length = mText.length(); 83 for(int i = 0; i < length; i++) { 84 char c = mText.charAt(i); 85 width += mWidth[c - '0']; 86 } 87 return width; 88 } 89 format(int value)90 private String format(int value) { 91 return Integer.toString(value); 92 } 93 94 private LabelMaker mLabelMaker; 95 private String mText; 96 private int[] mWidth = new int[10]; 97 private int[] mLabelId = new int[10]; 98 private final static String sStrike = "0123456789"; 99 } 100