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.View; 28 29 public class Arcs extends GraphicsActivity { 30 31 @Override onCreate(Bundle savedInstanceState)32 protected void onCreate(Bundle savedInstanceState) { 33 super.onCreate(savedInstanceState); 34 setContentView(new SampleView(this)); 35 } 36 37 private static class SampleView extends View { 38 private Paint[] mPaints; 39 private Paint mFramePaint; 40 private boolean[] mUseCenters; 41 private RectF[] mOvals; 42 private RectF mBigOval; 43 private float mStart; 44 private float mSweep; 45 private int mBigIndex; 46 47 private static final float SWEEP_INC = 2; 48 private static final float START_INC = 15; 49 SampleView(Context context)50 public SampleView(Context context) { 51 super(context); 52 53 mPaints = new Paint[4]; 54 mUseCenters = new boolean[4]; 55 mOvals = new RectF[4]; 56 57 mPaints[0] = new Paint(); 58 mPaints[0].setAntiAlias(true); 59 mPaints[0].setStyle(Paint.Style.FILL); 60 mPaints[0].setColor(0x88FF0000); 61 mUseCenters[0] = false; 62 63 mPaints[1] = new Paint(mPaints[0]); 64 mPaints[1].setColor(0x8800FF00); 65 mUseCenters[1] = true; 66 67 mPaints[2] = new Paint(mPaints[0]); 68 mPaints[2].setStyle(Paint.Style.STROKE); 69 mPaints[2].setStrokeWidth(4); 70 mPaints[2].setColor(0x880000FF); 71 mUseCenters[2] = false; 72 73 mPaints[3] = new Paint(mPaints[2]); 74 mPaints[3].setColor(0x88888888); 75 mUseCenters[3] = true; 76 77 mBigOval = new RectF(40, 10, 280, 250); 78 79 mOvals[0] = new RectF( 10, 270, 70, 330); 80 mOvals[1] = new RectF( 90, 270, 150, 330); 81 mOvals[2] = new RectF(170, 270, 230, 330); 82 mOvals[3] = new RectF(250, 270, 310, 330); 83 84 mFramePaint = new Paint(); 85 mFramePaint.setAntiAlias(true); 86 mFramePaint.setStyle(Paint.Style.STROKE); 87 mFramePaint.setStrokeWidth(0); 88 } 89 drawArcs(Canvas canvas, RectF oval, boolean useCenter, Paint paint)90 private void drawArcs(Canvas canvas, RectF oval, boolean useCenter, 91 Paint paint) { 92 canvas.drawRect(oval, mFramePaint); 93 canvas.drawArc(oval, mStart, mSweep, useCenter, paint); 94 } 95 onDraw(Canvas canvas)96 @Override protected void onDraw(Canvas canvas) { 97 canvas.drawColor(Color.WHITE); 98 99 drawArcs(canvas, mBigOval, mUseCenters[mBigIndex], 100 mPaints[mBigIndex]); 101 102 for (int i = 0; i < 4; i++) { 103 drawArcs(canvas, mOvals[i], mUseCenters[i], mPaints[i]); 104 } 105 106 mSweep += SWEEP_INC; 107 if (mSweep > 360) { 108 mSweep -= 360; 109 mStart += START_INC; 110 if (mStart >= 360) { 111 mStart -= 360; 112 } 113 mBigIndex = (mBigIndex + 1) % mOvals.length; 114 } 115 invalidate(); 116 } 117 } 118 } 119 120