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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.apis.graphics;
import android.app.Activity;
import android.content.Context;
import android.graphics.*;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
public class UnicodeChart extends GraphicsActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
private Paint mBigCharPaint;
private Paint mLabelPaint;
private final char[] mChars = new char[256];
private final float[] mPos = new float[512];
private int mBase;
private static final int XMUL = 20;
private static final int YMUL = 28;
private static final int YBASE = 18;
public SampleView(Context context) {
super(context);
setFocusable(true);
setFocusableInTouchMode(true);
mBigCharPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mBigCharPaint.setTextSize(15);
mBigCharPaint.setTextAlign(Paint.Align.CENTER);
mLabelPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mLabelPaint.setTextSize(8);
mLabelPaint.setTextAlign(Paint.Align.CENTER);
// the position array is the same for all charts
float[] pos = mPos;
int index = 0;
for (int col = 0; col < 16; col++) {
final float x = col * 20 + 10;
for (int row = 0; row < 16; row++) {
pos[index++] = x;
pos[index++] = row * YMUL + YBASE;
}
}
}
private float computeX(int index) {
return (index >> 4) * 20 + 10;
}
private float computeY(int index) {
return (index & 0xF) * YMUL + YMUL;
}
private void drawChart(Canvas canvas, int base) {
char[] chars = mChars;
for (int i = 0; i < 256; i++) {
int unichar = base + i;
chars[i] = (char)unichar;
canvas.drawText(Integer.toHexString(unichar),
computeX(i), computeY(i), mLabelPaint);
}
canvas.drawPosText(chars, 0, 256, mPos, mBigCharPaint);
}
@Override protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
canvas.translate(0, 1);
drawChart(canvas, mBase * 256);
}
@Override public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_LEFT:
if (mBase > 0) {
mBase -= 1;
invalidate();
}
return true;
case KeyEvent.KEYCODE_DPAD_RIGHT:
mBase += 1;
invalidate();
return true;
default:
break;
}
return super.onKeyDown(keyCode, event);
}
}
}
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