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