1 /* 2 * Copyright (C) 2007 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.example.android.apis.graphics; 18 19 import android.content.Context; 20 import android.graphics.*; 21 import android.os.Bundle; 22 import android.view.*; 23 24 public class MeasureText extends GraphicsActivity { 25 26 @Override onCreate(Bundle savedInstanceState)27 protected void onCreate(Bundle savedInstanceState) { 28 super.onCreate(savedInstanceState); 29 setContentView(new SampleView(this)); 30 } 31 32 private static final int WIDTH = 50; 33 private static final int HEIGHT = 50; 34 private static final int STRIDE = 64; // must be >= WIDTH 35 createColors()36 private static int[] createColors() { 37 int[] colors = new int[STRIDE * HEIGHT]; 38 for (int y = 0; y < HEIGHT; y++) { 39 for (int x = 0; x < WIDTH; x++) { 40 int r = x * 255 / (WIDTH - 1); 41 int g = y * 255 / (HEIGHT - 1); 42 int b = 255 - Math.min(r, g); 43 int a = Math.max(r, g); 44 colors[y * STRIDE + x] = (a << 24) | (r << 16) | (g << 8) | b; 45 } 46 } 47 return colors; 48 } 49 50 private static class SampleView extends View { 51 private Paint mPaint; 52 private float mOriginX = 10; 53 private float mOriginY = 80; 54 SampleView(Context context)55 public SampleView(Context context) { 56 super(context); 57 setFocusable(true); 58 59 mPaint = new Paint(); 60 mPaint.setAntiAlias(true); 61 mPaint.setStrokeWidth(5); 62 mPaint.setStrokeCap(Paint.Cap.ROUND); 63 mPaint.setTextSize(64); 64 mPaint.setTypeface(Typeface.create(Typeface.SERIF, 65 Typeface.ITALIC)); 66 } 67 showText(Canvas canvas, String text, Paint.Align align)68 private void showText(Canvas canvas, String text, Paint.Align align) { 69 // mPaint.setTextAlign(align); 70 71 Rect bounds = new Rect(); 72 float[] widths = new float[text.length()]; 73 74 int count = mPaint.getTextWidths(text, 0, text.length(), widths); 75 float w = mPaint.measureText(text, 0, text.length()); 76 mPaint.getTextBounds(text, 0, text.length(), bounds); 77 78 mPaint.setColor(0xFF88FF88); 79 canvas.drawRect(bounds, mPaint); 80 mPaint.setColor(Color.BLACK); 81 canvas.drawText(text, 0, 0, mPaint); 82 83 float[] pts = new float[2 + count*2]; 84 float x = 0; 85 float y = 0; 86 pts[0] = x; 87 pts[1] = y; 88 for (int i = 0; i < count; i++) { 89 x += widths[i]; 90 pts[2 + i*2] = x; 91 pts[2 + i*2 + 1] = y; 92 } 93 mPaint.setColor(Color.RED); 94 mPaint.setStrokeWidth(0); 95 canvas.drawLine(0, 0, w, 0, mPaint); 96 mPaint.setStrokeWidth(5); 97 canvas.drawPoints(pts, 0, (count + 1) << 1, mPaint); 98 } 99 onDraw(Canvas canvas)100 @Override protected void onDraw(Canvas canvas) { 101 canvas.drawColor(Color.WHITE); 102 103 canvas.translate(mOriginX, mOriginY); 104 105 showText(canvas, "Measure", Paint.Align.LEFT); 106 canvas.translate(0, 80); 107 showText(canvas, "wiggy!", Paint.Align.CENTER); 108 canvas.translate(0, 80); 109 showText(canvas, "Text", Paint.Align.RIGHT); 110 } 111 } 112 } 113