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 onCreate(Bundle savedInstanceState)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 SampleView(Context context)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 computeX(int index)74 private float computeX(int index) { 75 return (index >> 4) * XMUL + 10; 76 } 77 computeY(int index)78 private float computeY(int index) { 79 return (index & 0xF) * YMUL + YMUL; 80 } 81 drawChart(Canvas canvas, int base)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 onDraw(Canvas canvas)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 onKeyDown(int keyCode, KeyEvent event)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