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      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 {
     24     public NumericSprite() {
     25         mText = "";
     26         mLabelMaker = null;
     27     }
     28 
     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 
     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      */
     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 
     63     public void setValue(int value) {
     64         mText = format(value);
     65     }
     66 
     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 
     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 
     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