ManyCircle

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public class ManyCircle extends View{    private Paint paint;    private int maxRadius = 16;    private ValueAnimator valueAnimator;    private boolean init = false;    private float radiu = 10;    public ManyCircle(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public ManyCircle(Context context) {        super(context);        init();    }    private void init() {        paint = new Paint();        paint.setColor(Color.RED);    }    private int width;    private int height;    private float pi2;    private float r;    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        if (!init) {            init = true;            start();            width = getWidth() / 2;            height = getHeight() / 2;            pi2 = 2*(float)Math.PI;            r = width-maxRadius;        }        canvas.drawCircle((float) (width + r * Math.sin(0)), (float) (height + r * Math.cos(0)), f(radiu+0), paint);        canvas.drawCircle((float) (width + r * Math.sin(pi2 /8)), (float) (height + r * Math.cos(pi2 /8)), f(radiu+2), paint);        canvas.drawCircle((float) (width + r * Math.sin(pi2 /8*2)), (float) (height + r * Math.cos(pi2 /8*2)), f(radiu+4), paint);        canvas.drawCircle((float) (width + r * Math.sin(pi2 /8*3)), (float) (height + r * Math.cos(pi2 /8*3)), f(radiu+6), paint);        canvas.drawCircle((float) (width + r * Math.sin(pi2 /8*4)), (float) (height + r * Math.cos(pi2 /8*4)), f(radiu+8), paint);        canvas.drawCircle((float) (width + r * Math.sin(pi2 /8*5)), (float) (height + r * Math.cos(pi2 /8*5)), f(radiu+10), paint);        canvas.drawCircle((float) (width + r * Math.sin(pi2 /8*6)), (float) (height + r * Math.cos(pi2 /8*6)), f(radiu+12), paint);        canvas.drawCircle((float) (width + r * Math.sin(pi2 /8*7)), (float) (height + r * Math.cos(pi2 /8*7)), f(radiu+14), paint);        if (valueAnimator.isRunning()) {            radiu = (float) valueAnimator.getAnimatedValue();            invalidate();        }    }    private void start() {        if (valueAnimator == null) {            valueAnimator = ValueAnimator.ofFloat(0, maxRadius);            valueAnimator.setInterpolator(new LinearInterpolator());            valueAnimator.setDuration(1000);            valueAnimator.start();        }else {            valueAnimator.start();        }        postDelayed(new Runnable() {            @Override            public void run() {                start();                invalidate();            }        }, valueAnimator.getDuration());        invalidate();    }    //分段函数    private float f(float x) {        if (x <=maxRadius / 2) {            return x;        } else if(x<maxRadius){            return maxRadius - x;        }else        if(x<maxRadius*3/2)        {            return x-maxRadius;        }else {            return 2*maxRadius-x;        }    }}
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