Android编程绘图操作之弧形绘制方法示例

这篇文章主要介绍了Android编程绘图操作之弧形绘制方法,结合实例形式分析了Android图形绘制的相关组件调用、属性设置与功能实现技巧,需要的朋友可以参考下

本文实例讲述了Android编程绘图操作之弧形绘制方法。分享给大家供大家参考，具体如下：

 /** * 绘制弧形图案 * @description： * @author ldm * @date 2016-4-25 下午4:37:01 */ public class ArcsActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new SampleView(this)); } /** * 自定义绘制图案的View * * @description： * @author ldm * @date 2016-4-25 下午4:19:40 */ private static class SampleView extends View { // 画圆形图案的画笔数组 private Paint[] mPaints; // 画矩形的画笔 private Paint mFramePaint; // 是否以矩形中心画图 private boolean[] mUseCenters; // 矩形框数组 private RectF[] mOvals; // 上面较大的矩形框 private RectF mBigOval; // 画圆弧起点 private float mStart; // 画圆弧角度 private float mSweep; // 画大图形对应角标index private int mBigIndex; // 角度变化增量 private static final float ANGLE_STEP = 3; // 初始角度 private static final float START_ANGLE = 15; public SampleView(Context context) { super(context); mPaints = new Paint[4]; mUseCenters = new boolean[4]; mOvals = new RectF[4]; mPaints[0] = new Paint(); mPaints[0].setAntiAlias(true);// 设置抗紧钜齿 mPaints[0].setStyle(Paint.Style.FILL);// 设置画笔填充风格 mPaints[0].setColor(0x88FF0000);// 设置颜色 mUseCenters[0] = false; mPaints[1] = new Paint(mPaints[0]); mPaints[1].setColor(0x8800FF00); mUseCenters[1] = true; mPaints[2] = new Paint(mPaints[0]); mPaints[2].setStyle(Paint.Style.STROKE);// 设置画笔空心风格 mPaints[2].setStrokeWidth(4);// 设置画笔宽度 mPaints[2].setColor(0x880000FF);// 设置颜色 mUseCenters[2] = false; mPaints[3] = new Paint(mPaints[2]); mPaints[3].setColor(0x88888888); mUseCenters[3] = true; mBigOval = new RectF(40, 10, 280, 250);// 初始化较大的矩形 mOvals[0] = new RectF(10, 270, 70, 330);// 初始化4个较小矩形 mOvals[1] = new RectF(90, 270, 150, 330); mOvals[2] = new RectF(170, 270, 230, 330); mOvals[3] = new RectF(250, 270, 310, 330); mFramePaint = new Paint(); mFramePaint.setAntiAlias(true); mFramePaint.setStyle(Paint.Style.STROKE); mFramePaint.setStrokeWidth(0); } @Override protected void onDraw(Canvas canvas) { canvas.drawColor(Color.WHITE); // 画大矩形 canvas.drawRect(mBigOval, mFramePaint); // 在大矩形分别 画4个圆弧图形 canvas.drawArc(mBigOval, mStart, mSweep, mUseCenters[mBigIndex], mPaints[mBigIndex]); for (int i = 0; i <4; i++) { canvas.drawRect(mOvals[i], mFramePaint);// 画四个小矩形 canvas.drawArc(mOvals[i], mStart, mSweep, mUseCenters[i],// 在四个小矩形中分别画圆弧 mPaints[i]); } mSweep += ANGLE_STEP;// 弧度改变 if (mSweep > 360) {// 弧度控制 mSweep -= 360; mStart += START_ANGLE; if (mStart >= 360) { mStart -= 360; } mBigIndex = (mBigIndex + 1) % mOvals.length; } invalidate(); } } }

静态效果如图：