| /* |
| * Copyright (C) 2008 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.app.Activity; |
| import android.content.Context; |
| import android.graphics.*; |
| import android.os.Bundle; |
| import android.view.View; |
| |
| public class Clipping extends GraphicsActivity { |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(new SampleView(this)); |
| } |
| |
| private static class SampleView extends View { |
| private Paint mPaint; |
| private Path mPath; |
| |
| public SampleView(Context context) { |
| super(context); |
| setFocusable(true); |
| |
| mPaint = new Paint(); |
| mPaint.setAntiAlias(true); |
| mPaint.setStrokeWidth(6); |
| mPaint.setTextSize(16); |
| mPaint.setTextAlign(Paint.Align.RIGHT); |
| |
| mPath = new Path(); |
| } |
| |
| private void drawScene(Canvas canvas) { |
| canvas.clipRect(0, 0, 100, 100); |
| |
| canvas.drawColor(Color.WHITE); |
| |
| mPaint.setColor(Color.RED); |
| canvas.drawLine(0, 0, 100, 100, mPaint); |
| |
| mPaint.setColor(Color.GREEN); |
| canvas.drawCircle(30, 70, 30, mPaint); |
| |
| mPaint.setColor(Color.BLUE); |
| canvas.drawText("Clipping", 100, 30, mPaint); |
| } |
| |
| @Override protected void onDraw(Canvas canvas) { |
| canvas.drawColor(Color.GRAY); |
| |
| canvas.save(); |
| canvas.translate(10, 10); |
| drawScene(canvas); |
| canvas.restore(); |
| |
| canvas.save(); |
| canvas.translate(160, 10); |
| canvas.clipRect(10, 10, 90, 90); |
| canvas.clipRect(30, 30, 70, 70, Region.Op.DIFFERENCE); |
| drawScene(canvas); |
| canvas.restore(); |
| |
| canvas.save(); |
| canvas.translate(10, 160); |
| mPath.reset(); |
| canvas.clipPath(mPath); // makes the clip empty |
| mPath.addCircle(50, 50, 50, Path.Direction.CCW); |
| canvas.clipPath(mPath, Region.Op.REPLACE); |
| drawScene(canvas); |
| canvas.restore(); |
| |
| canvas.save(); |
| canvas.translate(160, 160); |
| canvas.clipRect(0, 0, 60, 60); |
| canvas.clipRect(40, 40, 100, 100, Region.Op.UNION); |
| drawScene(canvas); |
| canvas.restore(); |
| |
| canvas.save(); |
| canvas.translate(10, 310); |
| canvas.clipRect(0, 0, 60, 60); |
| canvas.clipRect(40, 40, 100, 100, Region.Op.XOR); |
| drawScene(canvas); |
| canvas.restore(); |
| |
| canvas.save(); |
| canvas.translate(160, 310); |
| canvas.clipRect(0, 0, 60, 60); |
| canvas.clipRect(40, 40, 100, 100, Region.Op.REVERSE_DIFFERENCE); |
| drawScene(canvas); |
| canvas.restore(); |
| } |
| } |
| } |
| |