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 // Need the following import to get access to the app resources, since this 20 // class is in a sub-package. 21 //import com.example.android.apis.R; 22 23 import android.app.Activity; 24 import android.content.Context; 25 import android.graphics.*; 26 import android.os.Bundle; 27 import android.view.KeyEvent; 28 import android.view.View; 29 30 public class Sweep extends GraphicsActivity { 31 32 @Override onCreate(Bundle savedInstanceState)33 protected void onCreate(Bundle savedInstanceState) { 34 super.onCreate(savedInstanceState); 35 setContentView(new SampleView(this)); 36 } 37 38 private static class SampleView extends View { 39 private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 40 private float mRotate; 41 private Matrix mMatrix = new Matrix(); 42 private Shader mShader; 43 private boolean mDoTiming; 44 SampleView(Context context)45 public SampleView(Context context) { 46 super(context); 47 setFocusable(true); 48 setFocusableInTouchMode(true); 49 50 float x = 160; 51 float y = 100; 52 mShader = new SweepGradient(x, y, new int[] { Color.GREEN, 53 Color.RED, 54 Color.BLUE, 55 Color.GREEN }, null); 56 mPaint.setShader(mShader); 57 } 58 onDraw(Canvas canvas)59 @Override protected void onDraw(Canvas canvas) { 60 Paint paint = mPaint; 61 float x = 160; 62 float y = 100; 63 64 canvas.drawColor(Color.WHITE); 65 66 mMatrix.setRotate(mRotate, x, y); 67 mShader.setLocalMatrix(mMatrix); 68 mRotate += 3; 69 if (mRotate >= 360) { 70 mRotate = 0; 71 } 72 invalidate(); 73 74 if (mDoTiming) { 75 long now = System.currentTimeMillis(); 76 for (int i = 0; i < 20; i++) { 77 canvas.drawCircle(x, y, 80, paint); 78 } 79 now = System.currentTimeMillis() - now; 80 android.util.Log.d("skia", "sweep ms = " + (now/20.)); 81 } 82 else { 83 canvas.drawCircle(x, y, 80, paint); 84 } 85 } 86 onKeyDown(int keyCode, KeyEvent event)87 @Override public boolean onKeyDown(int keyCode, KeyEvent event) { 88 switch (keyCode) { 89 case KeyEvent.KEYCODE_D: 90 mPaint.setDither(!mPaint.isDither()); 91 invalidate(); 92 return true; 93 case KeyEvent.KEYCODE_T: 94 mDoTiming = !mDoTiming; 95 invalidate(); 96 return true; 97 } 98 return super.onKeyDown(keyCode, event); 99 } 100 } 101 } 102 103