Path绘制贝塞尔曲线和波浪waveView

用path绘制简单的二阶贝塞尔曲线效果图如下：

  @Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
        Path path=new Path();
        path.moveTo(0,300);
        path.quadTo(waveLength/2,150,waveLength,300);
        canvas.drawPath(path,paint);
        path.quadTo(waveLength+waveLength/2,450,waveLength*2,300);
        path.close();
        canvas.drawPath(path,paint);
    }

waveview的结构图

   @Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//绘制waveView
        path.reset();
if (deltY<150) {
            deltY+=10;

        }
        deltY+=5;
        path.moveTo(-waveLength + deltX, startY-deltY);
if (startY-deltY<-waveHeight) {
            canvas.save();
return;
        }
for (int i = -waveLength; i < getWidth() + waveLength; i += waveLength) {
            path.rQuadTo(waveLength / 4, -waveHeight, waveLength / 2, 0);
            path.rQuadTo(waveLength / 4, waveHeight, waveLength / 2, 0);
        }

        matrix.setScale(0,2f);
//形成闭合区域，填充色块
        path.lineTo(getWidth(),getHeight());
        path.lineTo(0,getHeight());
        path.lineTo(-waveLength + deltX, startY-deltY);
        path.close();
        canvas.drawPath(path, paint);
    }

protected void startWave() {
//利用属性动画特性不断的计算动画时间点返回的整数值
        ValueAnimator animator = ValueAnimator.ofInt(0, waveLength);
//动画没有设置任何属性值,scale,translate
        animator.setDuration(1200);
        animator.setInterpolator(new AccelerateDecelerateInterpolator());
        animator.setRepeatCount(ValueAnimator.INFINITE);
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
                deltX = (int) animation.getAnimatedValue();
                postInvalidate();
            }
        });
        animator.start();
    }