Andorid绘制学习——贝塞尔曲线（二阶实战水波效果）

这个是横向滚动的，自己学着做了一个，但是还有很多细节没有达到，采用的值动画来实现；就是动画结束之后会有停顿一小会，希望各位高手帮忙看看，该怎么解决比较好，在这里谢谢了！

下面是我写的Demo：

public class BezierView extends View {    private static final float POINTWIDTH = 2;    private Paint mPaint;           // 画笔    private Path mPath;             // 路径    private int len = 800;          // 一个正余弦的宽度    private int startX = 0;      // 绘制的起点    private int maxHeight = 500;    // 最高点的坐标值    private int minHeight = 300;    // 最低点的坐标值    private int levHeight = 400;    // 水平线坐标值    private int goBottomLength = 500;  //水平线到底部的距离    private Point startPoint1,startPoint2,startPoint3,startPoint4,startPoint5,startPoint6;       // 开始点    private Point endPoint1,endPoint2,endPoint3,endPoint4,endPoint5,endPoint6;                   // 结束点    private Point assistPoint1,assistPoint2,assistPoint3,assistPoint4,assistPoint5,assistPoint6; // 动点    private List<Point> startPointList = new ArrayList<>();    private List<Point> endPointList = new ArrayList<>();    private List<Point> assistPointList = new ArrayList<>();    public BezierView(Context context) {        this(context,null);    }    public BezierView(Context context, AttributeSet attrs) {        this(context, attrs,0);    }    public BezierView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init(context);    }    private void init(Context context) {        mPaint = new Paint();        mPath = new Path();        // 抗锯齿        mPaint.setAntiAlias(true);        // 防抖动        mPaint.setDither(true);        mPaint.setColor(Color.BLACK);        // 笔宽        mPaint.setStrokeWidth(POINTWIDTH);        // 空心        mPaint.setStyle(Paint.Style.FILL);    }    private Point currentPoint;    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        startPointList.clear();        endPointList.clear();        assistPointList.clear();        // 左边1贝塞尔的位置        startPoint1 = new Point(startX, levHeight);        endPoint1 = new Point(startX+ len/2, levHeight);        assistPoint1 = new Point((startPoint1.x + endPoint1.x)/2, minHeight);        startPointList.add(startPoint1);        endPointList.add(endPoint1);        assistPointList.add(assistPoint1);        // 左边2贝塞尔的位置        startPoint2 = new Point(endPointList.get(0).x, levHeight);        endPoint2 = new Point(endPointList.get(0).x + len/2, levHeight);        assistPoint2 = new Point((startPoint2.x + endPoint2.x)/2, maxHeight);        startPointList.add(startPoint2);        endPointList.add(endPoint2);        assistPointList.add(assistPoint2);        // 右1        startPoint3 = new Point(startX + len, levHeight);        endPoint3 = new Point(startX+ len/2 + len, levHeight);        assistPoint3 = new Point((startPoint3.x + endPoint3.x)/2, minHeight);        startPointList.add(startPoint3);        endPointList.add(endPoint3);        assistPointList.add(assistPoint3);        // 右2        startPoint4 = new Point(endPointList.get(0).x + len, levHeight);        endPoint4 = new Point(endPointList.get(0).x + len/2 + len, levHeight);        assistPoint4 = new Point((startPoint4.x + endPoint4.x)/2, maxHeight);        startPointList.add(startPoint4);        endPointList.add(endPoint4);        assistPointList.add(assistPoint4);        // 备份一个（达到连续的效果）        startPoint5 = new Point(startX - len, levHeight);        endPoint5 = new Point(startX+ len/2 - len, levHeight);        assistPoint5 = new Point((startPoint5.x + endPoint5.x)/2, minHeight);        startPointList.add(startPoint5);        endPointList.add(endPoint5);        assistPointList.add(assistPoint5);        // 左边2贝塞尔的位置        startPoint6 = new Point(startX-len/2, levHeight);        endPoint6 = new Point(startX, levHeight);        assistPoint6 = new Point((startPoint6.x + endPoint6.x)/2, maxHeight);        startPointList.add(startPoint6);        endPointList.add(endPoint6);        assistPointList.add(assistPoint6);        if (currentPoint == null) {            currentPoint = new Point(startPoint1.x,levHeight);            mPath.reset();            // 起点            mPath.moveTo(startPoint5.x, startPoint5.y);            // 动点 和 终点            mPath.quadTo(assistPoint5.x, assistPoint5.y, endPoint5.x, endPoint5.y);            mPath.quadTo(assistPoint6.x, assistPoint6.y, endPoint6.x, endPoint6.y);            mPath.quadTo(assistPoint1.x, assistPoint1.y, endPoint1.x, endPoint1.y);            mPath.quadTo(assistPoint2.x, assistPoint2.y, endPoint2.x, endPoint2.y);            mPath.quadTo(assistPoint3.x, assistPoint3.y, endPoint3.x, endPoint3.y);            mPath.quadTo(assistPoint4.x, assistPoint4.y, endPoint4.x, endPoint4.y);            mPath.lineTo(endPoint4.x,endPoint4.y+goBottomLength);            mPath.lineTo(startPoint5.x,endPoint4.y+goBottomLength);            mPath.lineTo(startPoint5.x,endPoint4.y);            // 画路径            canvas.drawPath(mPath, mPaint);            startAnimation();        } else {            mPath.reset();            // 起点            mPath.moveTo(startPoint5.x, startPoint5.y);            // 动点 和 终点            mPath.quadTo(assistPoint5.x, assistPoint5.y, endPoint5.x, endPoint5.y);            mPath.quadTo(assistPoint6.x, assistPoint6.y, endPoint6.x, endPoint6.y);            mPath.quadTo(assistPoint1.x, assistPoint1.y, endPoint1.x, endPoint1.y);            mPath.quadTo(assistPoint2.x, assistPoint2.y, endPoint2.x, endPoint2.y);            mPath.quadTo(assistPoint3.x, assistPoint3.y, endPoint3.x, endPoint3.y);            mPath.quadTo(assistPoint4.x, assistPoint4.y, endPoint4.x, endPoint4.y);            mPath.lineTo(endPoint4.x,endPoint4.y+goBottomLength);            mPath.lineTo(startPoint5.x,endPoint4.y+goBottomLength);            mPath.lineTo(startPoint5.x,endPoint4.y);            // 画路径            canvas.drawPath(mPath, mPaint);        }    }    private void startAnimation(){        ValueAnimator anim = ValueAnimator.ofObject(new PointEvaluator(), startPoint1, startPoint3);        anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                    currentPoint = (Point) animation.getAnimatedValue();                    startX = currentPoint.x;                    invalidate();            }        });        anim.addListener(new Animator.AnimatorListener() {            @Override            public void onAnimationStart(Animator animator) {            }            @Override            public void onAnimationEnd(Animator animator) {                currentPoint = null;                startX = 0;            }            @Override            public void onAnimationCancel(Animator animator) {            }            @Override            public void onAnimationRepeat(Animator animator) {            }        });        anim.setDuration(5000);        anim.start();    }    public class PointEvaluator implements TypeEvaluator { // 值动画对象（重新赋值）        @Override        public Object evaluate(float fraction, Object startValue, Object endValue) {            Point startPoint = (Point) startValue;            Point endPoint = (Point) endValue;            float x = startPoint.x + fraction * (endPoint.x - startPoint.x);            float y = startPoint.y + fraction * (endPoint.y - startPoint.y);            Point point = new Point((int)x, (int)y);            return point;        }    }}