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.app.Activity; 20 import android.content.Context; 21 import android.graphics.*; 22 import android.os.Bundle; 23 import android.view.KeyEvent; 24 import android.view.View; 25 26 public class PathEffects extends GraphicsActivity { 27 28 @Override onCreate(Bundle savedInstanceState)29 protected void onCreate(Bundle savedInstanceState) { 30 super.onCreate(savedInstanceState); 31 setContentView(new SampleView(this)); 32 } 33 34 private static class SampleView extends View { 35 private Paint mPaint; 36 private Path mPath; 37 private PathEffect[] mEffects; 38 private int[] mColors; 39 private float mPhase; 40 makeDash(float phase)41 private static PathEffect makeDash(float phase) { 42 return new DashPathEffect(new float[] { 15, 5, 8, 5 }, phase); 43 } 44 makeEffects(PathEffect[] e, float phase)45 private static void makeEffects(PathEffect[] e, float phase) { 46 e[0] = null; // no effect 47 e[1] = new CornerPathEffect(10); 48 e[2] = new DashPathEffect(new float[] {10, 5, 5, 5}, phase); 49 e[3] = new PathDashPathEffect(makePathDash(), 12, phase, 50 PathDashPathEffect.Style.ROTATE); 51 e[4] = new ComposePathEffect(e[2], e[1]); 52 e[5] = new ComposePathEffect(e[3], e[1]); 53 } 54 SampleView(Context context)55 public SampleView(Context context) { 56 super(context); 57 setFocusable(true); 58 setFocusableInTouchMode(true); 59 60 mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 61 mPaint.setStyle(Paint.Style.STROKE); 62 mPaint.setStrokeWidth(6); 63 64 mPath = makeFollowPath(); 65 66 mEffects = new PathEffect[6]; 67 68 mColors = new int[] { Color.BLACK, Color.RED, Color.BLUE, 69 Color.GREEN, Color.MAGENTA, Color.BLACK 70 }; 71 } 72 onDraw(Canvas canvas)73 @Override protected void onDraw(Canvas canvas) { 74 canvas.drawColor(Color.WHITE); 75 76 RectF bounds = new RectF(); 77 mPath.computeBounds(bounds, false); 78 canvas.translate(10 - bounds.left, 10 - bounds.top); 79 80 makeEffects(mEffects, mPhase); 81 mPhase += 1; 82 invalidate(); 83 84 for (int i = 0; i < mEffects.length; i++) { 85 mPaint.setPathEffect(mEffects[i]); 86 mPaint.setColor(mColors[i]); 87 canvas.drawPath(mPath, mPaint); 88 canvas.translate(0, 28); 89 } 90 } 91 onKeyDown(int keyCode, KeyEvent event)92 @Override public boolean onKeyDown(int keyCode, KeyEvent event) { 93 switch (keyCode) { 94 case KeyEvent.KEYCODE_DPAD_CENTER: 95 mPath = makeFollowPath(); 96 return true; 97 } 98 return super.onKeyDown(keyCode, event); 99 } 100 makeFollowPath()101 private static Path makeFollowPath() { 102 Path p = new Path(); 103 p.moveTo(0, 0); 104 for (int i = 1; i <= 15; i++) { 105 p.lineTo(i*20, (float)Math.random() * 35); 106 } 107 return p; 108 } 109 makePathDash()110 private static Path makePathDash() { 111 Path p = new Path(); 112 p.moveTo(4, 0); 113 p.lineTo(0, -4); 114 p.lineTo(8, -4); 115 p.lineTo(12, 0); 116 p.lineTo(8, 4); 117 p.lineTo(0, 4); 118 return p; 119 } 120 } 121 } 122 123