android贝塞尔曲线实现波浪效果

public class WaveView extends View implements View.OnClickListener {
 //路径
 private Path mPath;
 //画笔
 private Paint mPaint;
 //屏幕高度
 private int screenHeight;
 //屏幕宽度
 private int screenWidth;
 //波长 自己控制
 private int waveLength = 800;
 //波长的数量
 private int waveCount;
 //贝塞尔曲线的控制点
 private int centerY;
 private ValueAnimator mValueAnimator;
 //偏移量
 private int mOffset;
 
 public WaveView(Context context) {
  this(context, null);
 }
 
 public WaveView(Context context, @Nullable AttributeSet attrs) {
  super(context, attrs);
  init();
 }
 
 private void init() {
  //初始化画笔
  mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  mPaint.setStyle(Paint.Style.FILL);
  mPaint.setColor(Color.RED);
  
  mPath = new Path();
 }
 
 @Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  screenHeight = h;// 获取屏幕高度
  screenWidth = w;//获取屏幕宽度
 
  centerY = h / 2;//设置中心点
  waveCount = (int) Math.round(screenWidth / waveLength + 1.5);//波长的数量
 }
 
 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  mPath.reset();
  //首先移动到最左边 offset是偏移量
  mPath.moveTo(-waveLength + mOffset, centerY);
  for (int i = 0; i