| /* |
| * Copyright (C) 2010 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.android.test.hwui; |
| |
| import android.app.Activity; |
| import android.content.Context; |
| import android.graphics.Canvas; |
| import android.graphics.Paint; |
| import android.graphics.Path; |
| import android.graphics.PathMeasure; |
| import android.os.Bundle; |
| import android.view.View; |
| |
| @SuppressWarnings({"UnusedDeclaration"}) |
| public class TextOnPathActivity extends Activity { |
| private Path mPath; |
| private Path mStraightPath; |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| |
| mPath = makePath(); |
| mStraightPath = makeStraightPath(); |
| |
| final TextOnPathView view = new TextOnPathView(this); |
| setContentView(view); |
| } |
| |
| private static Path makePath() { |
| Path path = new Path(); |
| buildPath(path); |
| return path; |
| } |
| |
| private static void buildPath(Path path) { |
| path.moveTo(0.0f, 0.0f); |
| path.cubicTo(0.0f, 0.0f, 100.0f, 150.0f, 100.0f, 200.0f); |
| path.cubicTo(100.0f, 200.0f, 50.0f, 300.0f, -80.0f, 200.0f); |
| path.cubicTo(-80.0f, 200.0f, 100.0f, 200.0f, 200.0f, 0.0f); |
| } |
| |
| private static Path makeStraightPath() { |
| Path path = new Path(); |
| buildStraightPath(path); |
| return path; |
| } |
| |
| private static void buildStraightPath(Path path) { |
| path.moveTo(0.0f, 0.0f); |
| path.lineTo(400.0f, 0.0f); |
| } |
| |
| public class TextOnPathView extends View { |
| private static final String TEST_STRING = "Hello OpenGL renderer, text on path! "; |
| |
| private final Paint mPaint; |
| private final Paint mPathPaint; |
| private final String mText; |
| private final PathMeasure mMeasure; |
| private final float mLength; |
| private final float[] mLines; |
| private final float[] mPos; |
| private final float[] mTan; |
| |
| public TextOnPathView(Context c) { |
| super(c); |
| |
| mPaint = new Paint(); |
| mPaint.setAntiAlias(true); |
| mPaint.setColor(0xff000000); |
| |
| mPathPaint = new Paint(); |
| mPathPaint.setAntiAlias(true); |
| mPathPaint.setStyle(Paint.Style.STROKE); |
| mPathPaint.setColor(0xff000099); |
| |
| StringBuilder builder = new StringBuilder(TEST_STRING.length() * 2); |
| for (int i = 0; i < 2; i++) { |
| builder.append(TEST_STRING); |
| } |
| mText = builder.toString(); |
| |
| mMeasure = new PathMeasure(mPath, false); |
| mLength = mMeasure.getLength(); |
| |
| mLines = new float[100 * 4]; |
| mPos = new float[2]; |
| mTan = new float[2]; |
| } |
| |
| @Override |
| protected void onDraw(Canvas canvas) { |
| super.onDraw(canvas); |
| |
| canvas.drawARGB(255, 255, 255, 255); |
| |
| canvas.save(); |
| canvas.translate(400.0f, 350.0f); |
| mPaint.setTextAlign(Paint.Align.LEFT); |
| canvas.drawTextOnPath(mText + mText, mPath, 0.0f, 0.0f, mPaint); |
| canvas.drawPath(mPath, mPathPaint); |
| |
| for (int i = 0; i < 100; i++) { |
| mMeasure.getPosTan(i * mLength / 100.0f, mPos, mTan); |
| mLines[i * 4 ] = mPos[0]; |
| mLines[i * 4 + 1] = mPos[1]; |
| mLines[i * 4 + 2] = mPos[0] + mTan[1] * 15; |
| mLines[i * 4 + 3] = mPos[1] - mTan[0] * 15; |
| } |
| canvas.drawLines(mLines, mPathPaint); |
| |
| canvas.translate(200.0f, 0.0f); |
| canvas.drawTextOnPath(mText + mText, mStraightPath, 0.0f, 0.0f, mPaint); |
| canvas.drawPath(mStraightPath, mPathPaint); |
| |
| canvas.restore(); |
| |
| canvas.save(); |
| canvas.translate(150.0f, 60.0f); |
| canvas.drawTextOnPath(mText, mPath, 0.0f, 10.0f, mPaint); |
| mMeasure.getPosTan(5.0f, mPos, mTan); |
| canvas.drawLine(mPos[0], mPos[1], mPos[0] + mTan[1] * 10, mPos[1] - mTan[0] * 10, |
| mPathPaint); |
| canvas.drawPath(mPath, mPathPaint); |
| |
| canvas.translate(250.0f, 0.0f); |
| mPaint.setTextAlign(Paint.Align.CENTER); |
| canvas.drawTextOnPath(mText, mPath, 0.0f, 0.0f, mPaint); |
| canvas.drawPath(mPath, mPathPaint); |
| |
| canvas.translate(250.0f, 0.0f); |
| mPaint.setTextAlign(Paint.Align.RIGHT); |
| canvas.drawTextOnPath(mText, mPath, 0.0f, 0.0f, mPaint); |
| canvas.drawPath(mPath, mPathPaint); |
| canvas.restore(); |
| } |
| } |
| } |