Android绘图之：弧形绘制

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/** * 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：
这里写图片描述
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