private void quadTo(float x1,float y1,float x2,float y2){
  mPath.quadTo(x1,y1,mLastX=x2,mLastY=y2);
}

private void quadTo ( float x1 , float y1 , float x2 , float y2 ) { mPath . quadTo ( x1 , y1 , mLastX = x2 , mLastY = y2 ) ; }
add a quadratic bezier from the last point , approaching control point ( x1 , y1 ) , and ending at ( x2 , y2 ) . if no moveto ( ) call has been made for this contour , the first point is automatically set to ( 0 , 0 ) .
