| /* |
| * Copyright (C) 2007 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.content.Context; |
| import android.graphics.*; |
| import android.os.Bundle; |
| import android.view.*; |
| |
| public class MeasureText extends GraphicsActivity { |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(new SampleView(this)); |
| } |
| |
| private static final int WIDTH = 50; |
| private static final int HEIGHT = 50; |
| private static final int STRIDE = 64; // must be >= WIDTH |
| |
| private static int[] createColors() { |
| int[] colors = new int[STRIDE * HEIGHT]; |
| for (int y = 0; y < HEIGHT; y++) { |
| for (int x = 0; x < WIDTH; x++) { |
| int r = x * 255 / (WIDTH - 1); |
| int g = y * 255 / (HEIGHT - 1); |
| int b = 255 - Math.min(r, g); |
| int a = Math.max(r, g); |
| colors[y * STRIDE + x] = (a << 24) | (r << 16) | (g << 8) | b; |
| } |
| } |
| return colors; |
| } |
| |
| private static class SampleView extends View { |
| private Paint mPaint; |
| private float mOriginX = 10; |
| private float mOriginY = 80; |
| |
| public SampleView(Context context) { |
| super(context); |
| setFocusable(true); |
| |
| mPaint = new Paint(); |
| mPaint.setAntiAlias(true); |
| mPaint.setStrokeWidth(5); |
| mPaint.setStrokeCap(Paint.Cap.ROUND); |
| mPaint.setTextSize(64); |
| mPaint.setTypeface(Typeface.create(Typeface.SERIF, |
| Typeface.ITALIC)); |
| } |
| |
| private void showText(Canvas canvas, String text, Paint.Align align) { |
| // mPaint.setTextAlign(align); |
| |
| Rect bounds = new Rect(); |
| float[] widths = new float[text.length()]; |
| |
| int count = mPaint.getTextWidths(text, 0, text.length(), widths); |
| float w = mPaint.measureText(text, 0, text.length()); |
| mPaint.getTextBounds(text, 0, text.length(), bounds); |
| |
| mPaint.setColor(0xFF88FF88); |
| canvas.drawRect(bounds, mPaint); |
| mPaint.setColor(Color.BLACK); |
| canvas.drawText(text, 0, 0, mPaint); |
| |
| float[] pts = new float[2 + count*2]; |
| float x = 0; |
| float y = 0; |
| pts[0] = x; |
| pts[1] = y; |
| for (int i = 0; i < count; i++) { |
| x += widths[i]; |
| pts[2 + i*2] = x; |
| pts[2 + i*2 + 1] = y; |
| } |
| mPaint.setColor(Color.RED); |
| mPaint.setStrokeWidth(0); |
| canvas.drawLine(0, 0, w, 0, mPaint); |
| mPaint.setStrokeWidth(5); |
| canvas.drawPoints(pts, 0, (count + 1) << 1, mPaint); |
| } |
| |
| @Override protected void onDraw(Canvas canvas) { |
| canvas.drawColor(Color.WHITE); |
| |
| canvas.translate(mOriginX, mOriginY); |
| |
| showText(canvas, "Measure", Paint.Align.LEFT); |
| canvas.translate(0, 80); |
| showText(canvas, "wiggy!", Paint.Align.CENTER); |
| canvas.translate(0, 80); |
| showText(canvas, "Text", Paint.Align.RIGHT); |
| } |
| } |
| } |