水波线

package gg.bw.com.wangshu20190404;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.View;

public class WaterView2 extends View {
Paint paint = new Paint();

Path path = new Path();
float mt;
public WaterView2(Context context) {
    super(context);
    paint.setAntiAlias(true);
}

public WaterView2(Context context,  AttributeSet attrs) {
    super(context, attrs);
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    path.reset();
    path.moveTo(getLeft(),getBottom());
     float v = (float) (Math.PI *2/ getRight());
     mt-=0.1;
    for (int i = 0; i <=getRight() ; i+=20) {
        path.lineTo(i, (float) (10 * Math.cos(v * i +mt)+ 10));
    }
    path.lineTo(getRight(),getBottom());

    canvas.drawPath(path,paint);
    postInvalidateDelayed(20);


}

}