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      1 /*
      2  * Copyright (C) 2010 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.android.test.hwui;
     18 
     19 import android.app.Activity;
     20 import android.content.Context;
     21 import android.graphics.Canvas;
     22 import android.graphics.Paint;
     23 import android.graphics.Path;
     24 import android.graphics.PathMeasure;
     25 import android.os.Bundle;
     26 import android.view.View;
     27 
     28 @SuppressWarnings({"UnusedDeclaration"})
     29 public class TextOnPathActivity extends Activity {
     30     private Path mPath;
     31     private Path mStraightPath;
     32 
     33     @Override
     34     protected void onCreate(Bundle savedInstanceState) {
     35         super.onCreate(savedInstanceState);
     36 
     37         mPath = makePath();
     38         mStraightPath = makeStraightPath();
     39 
     40         final TextOnPathView view = new TextOnPathView(this);
     41         setContentView(view);
     42     }
     43 
     44     private static Path makePath() {
     45         Path path = new Path();
     46         buildPath(path);
     47         return path;
     48     }
     49 
     50     private static void buildPath(Path path) {
     51         path.moveTo(0.0f, 0.0f);
     52         path.cubicTo(0.0f, 0.0f, 100.0f, 150.0f, 100.0f, 200.0f);
     53         path.cubicTo(100.0f, 200.0f, 50.0f, 300.0f, -80.0f, 200.0f);
     54         path.cubicTo(-80.0f, 200.0f, 100.0f, 200.0f, 200.0f, 0.0f);
     55     }
     56 
     57     private static Path makeStraightPath() {
     58         Path path = new Path();
     59         buildStraightPath(path);
     60         return path;
     61     }
     62 
     63     private static void buildStraightPath(Path path) {
     64         path.moveTo(0.0f, 0.0f);
     65         path.lineTo(400.0f, 0.0f);
     66     }
     67 
     68     public class TextOnPathView extends View {
     69         private static final String TEST_STRING = "Hello OpenGL renderer, text on path! ";
     70 
     71         private final Paint mPaint;
     72         private final Paint mPathPaint;
     73         private final String mText;
     74         private final PathMeasure mMeasure;
     75         private final float mLength;
     76         private final float[] mLines;
     77         private final float[] mPos;
     78         private final float[] mTan;
     79 
     80         public TextOnPathView(Context c) {
     81             super(c);
     82 
     83             mPaint = new Paint();
     84             mPaint.setAntiAlias(true);
     85             mPaint.setColor(0xff000000);
     86 
     87             mPathPaint = new Paint();
     88             mPathPaint.setAntiAlias(true);
     89             mPathPaint.setStyle(Paint.Style.STROKE);
     90             mPathPaint.setColor(0xff000099);
     91 
     92             StringBuilder builder = new StringBuilder(TEST_STRING.length() * 2);
     93             for (int i = 0; i < 2; i++) {
     94                 builder.append(TEST_STRING);
     95             }
     96             mText = builder.toString();
     97 
     98             mMeasure = new PathMeasure(mPath, false);
     99             mLength = mMeasure.getLength();
    100 
    101             mLines = new float[100 * 4];
    102             mPos = new float[2];
    103             mTan = new float[2];
    104         }
    105 
    106         @Override
    107         protected void onDraw(Canvas canvas) {
    108             super.onDraw(canvas);
    109 
    110             canvas.drawARGB(255, 255, 255, 255);
    111 
    112             canvas.save();
    113             canvas.translate(400.0f, 350.0f);
    114             mPaint.setTextAlign(Paint.Align.LEFT);
    115             canvas.drawTextOnPath(mText + mText, mPath, 0.0f, 0.0f, mPaint);
    116             canvas.drawPath(mPath, mPathPaint);
    117 
    118             for (int i = 0; i < 100; i++) {
    119                 mMeasure.getPosTan(i * mLength / 100.0f, mPos, mTan);
    120                 mLines[i * 4    ] = mPos[0];
    121                 mLines[i * 4 + 1] = mPos[1];
    122                 mLines[i * 4 + 2] = mPos[0] + mTan[1] * 15;
    123                 mLines[i * 4 + 3] = mPos[1] - mTan[0] * 15;
    124             }
    125             canvas.drawLines(mLines, mPathPaint);
    126 
    127             canvas.translate(200.0f, 0.0f);
    128             canvas.drawTextOnPath(mText + mText, mStraightPath, 0.0f, 0.0f, mPaint);
    129             canvas.drawPath(mStraightPath, mPathPaint);
    130 
    131             canvas.restore();
    132 
    133             canvas.save();
    134             canvas.translate(150.0f, 60.0f);
    135             canvas.drawTextOnPath(mText, mPath, 0.0f, 10.0f, mPaint);
    136             mMeasure.getPosTan(5.0f, mPos, mTan);
    137             canvas.drawLine(mPos[0], mPos[1], mPos[0] + mTan[1] * 10, mPos[1] - mTan[0] * 10,
    138                     mPathPaint);
    139             canvas.drawPath(mPath, mPathPaint);
    140 
    141             canvas.translate(250.0f, 0.0f);
    142             mPaint.setTextAlign(Paint.Align.CENTER);
    143             canvas.drawTextOnPath(mText, mPath, 0.0f, 0.0f, mPaint);
    144             canvas.drawPath(mPath, mPathPaint);
    145 
    146             canvas.translate(250.0f, 0.0f);
    147             mPaint.setTextAlign(Paint.Align.RIGHT);
    148             canvas.drawTextOnPath(mText, mPath, 0.0f, 0.0f, mPaint);
    149             canvas.drawPath(mPath, mPathPaint);
    150             canvas.restore();
    151         }
    152     }
    153 }
    154