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/*
* 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();
}
}
}
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