1 /* 2 * Copyright (C) 2008 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.View; 23 24 public class Clipping extends GraphicsActivity { 25 26 @Override 27 protected void onCreate(Bundle savedInstanceState) { 28 super.onCreate(savedInstanceState); 29 setContentView(new SampleView(this)); 30 } 31 32 private static class SampleView extends View { 33 private Paint mPaint; 34 private Path mPath; 35 36 public SampleView(Context context) { 37 super(context); 38 setFocusable(true); 39 40 mPaint = new Paint(); 41 mPaint.setAntiAlias(true); 42 mPaint.setStrokeWidth(6); 43 mPaint.setTextSize(16); 44 mPaint.setTextAlign(Paint.Align.RIGHT); 45 46 mPath = new Path(); 47 } 48 49 private void drawScene(Canvas canvas) { 50 canvas.clipRect(0, 0, 100, 100); 51 52 canvas.drawColor(Color.WHITE); 53 54 mPaint.setColor(Color.RED); 55 canvas.drawLine(0, 0, 100, 100, mPaint); 56 57 mPaint.setColor(Color.GREEN); 58 canvas.drawCircle(30, 70, 30, mPaint); 59 60 mPaint.setColor(Color.BLUE); 61 canvas.drawText("Clipping", 100, 30, mPaint); 62 } 63 64 @Override protected void onDraw(Canvas canvas) { 65 canvas.drawColor(Color.GRAY); 66 67 canvas.save(); 68 canvas.translate(10, 10); 69 drawScene(canvas); 70 canvas.restore(); 71 72 canvas.save(); 73 canvas.translate(160, 10); 74 canvas.clipRect(10, 10, 90, 90); 75 canvas.clipRect(30, 30, 70, 70, Region.Op.DIFFERENCE); 76 drawScene(canvas); 77 canvas.restore(); 78 79 canvas.save(); 80 canvas.translate(10, 160); 81 mPath.reset(); 82 canvas.clipPath(mPath); // makes the clip empty 83 mPath.addCircle(50, 50, 50, Path.Direction.CCW); 84 canvas.clipPath(mPath, Region.Op.REPLACE); 85 drawScene(canvas); 86 canvas.restore(); 87 88 canvas.save(); 89 canvas.translate(160, 160); 90 canvas.clipRect(0, 0, 60, 60); 91 canvas.clipRect(40, 40, 100, 100, Region.Op.UNION); 92 drawScene(canvas); 93 canvas.restore(); 94 95 canvas.save(); 96 canvas.translate(10, 310); 97 canvas.clipRect(0, 0, 60, 60); 98 canvas.clipRect(40, 40, 100, 100, Region.Op.XOR); 99 drawScene(canvas); 100 canvas.restore(); 101 102 canvas.save(); 103 canvas.translate(160, 310); 104 canvas.clipRect(0, 0, 60, 60); 105 canvas.clipRect(40, 40, 100, 100, Region.Op.REVERSE_DIFFERENCE); 106 drawScene(canvas); 107 canvas.restore(); 108 } 109 } 110 } 111 112
