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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;
     18 
     19 import android.content.Context;
     20 import android.graphics.*;
     21 import android.os.Bundle;
     22 import android.view.KeyEvent;
     23 import android.view.View;
     24 import android.view.Window;
     25 
     26 public class UnicodeChart extends GraphicsActivity {
     27 
     28     @Override
     29     protected void onCreate(Bundle savedInstanceState) {
     30         super.onCreate(savedInstanceState);
     31 
     32         requestWindowFeature(Window.FEATURE_NO_TITLE);
     33 
     34         setContentView(new SampleView(this));
     35     }
     36 
     37     private static class SampleView extends View {
     38         private Paint mBigCharPaint;
     39         private Paint mLabelPaint;
     40         private final char[] mChars = new char[256];
     41         private final float[] mPos = new float[512];
     42 
     43         private int mBase;
     44 
     45         private static final int XMUL = 20;
     46         private static final int YMUL = 28;
     47         private static final int YBASE = 18;
     48 
     49         public SampleView(Context context) {
     50             super(context);
     51             setFocusable(true);
     52             setFocusableInTouchMode(true);
     53 
     54             mBigCharPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
     55             mBigCharPaint.setTextSize(15);
     56             mBigCharPaint.setTextAlign(Paint.Align.CENTER);
     57 
     58             mLabelPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
     59             mLabelPaint.setTextSize(8);
     60             mLabelPaint.setTextAlign(Paint.Align.CENTER);
     61 
     62             // the position array is the same for all charts
     63             float[] pos = mPos;
     64             int index = 0;
     65             for (int col = 0; col < 16; col++) {
     66                 final float x = col * XMUL + 10;
     67                 for (int row = 0; row < 16; row++) {
     68                     pos[index++] = x;
     69                     pos[index++] = row * YMUL + YBASE;
     70                 }
     71             }
     72         }
     73 
     74         private float computeX(int index) {
     75             return (index >> 4) * XMUL + 10;
     76         }
     77 
     78         private float computeY(int index) {
     79             return (index & 0xF) * YMUL + YMUL;
     80         }
     81 
     82         private void drawChart(Canvas canvas, int base) {
     83             char[] chars = mChars;
     84             for (int i = 0; i < 256; i++) {
     85                 int unichar = base + i;
     86                 chars[i] = (char)unichar;
     87 
     88                 canvas.drawText(Integer.toHexString(unichar),
     89                                 computeX(i), computeY(i), mLabelPaint);
     90             }
     91             canvas.drawPosText(chars, 0, 256, mPos, mBigCharPaint);
     92         }
     93 
     94         @Override protected void onDraw(Canvas canvas) {
     95             canvas.drawColor(Color.WHITE);
     96 
     97             canvas.translate(0, 1);
     98             drawChart(canvas, mBase * 256);
     99         }
    100 
    101         @Override public boolean onKeyDown(int keyCode, KeyEvent event) {
    102             switch (keyCode) {
    103                 case KeyEvent.KEYCODE_DPAD_LEFT:
    104                     if (mBase > 0) {
    105                         mBase -= 1;
    106                         invalidate();
    107                     }
    108                     return true;
    109                 case KeyEvent.KEYCODE_DPAD_RIGHT:
    110                     mBase += 1;
    111                     invalidate();
    112                     return true;
    113                 default:
    114                     break;
    115             }
    116             return super.onKeyDown(keyCode, event);
    117         }
    118     }
    119 }
    120