private void rLineTo(float dx,float dy){
  if (isEmpty()) {
    mPath.moveTo(mLastX=0,mLastY=0);
  }
  dx+=mLastX;
  dy+=mLastY;
  mPath.lineTo(mLastX=dx,mLastY=dy);
}

private void rLineTo ( float dx , float dy ) { if ( isEmpty ( ) ) { mPath . moveTo ( mLastX = 0 , mLastY = 0 ) ; } dx += mLastX ; dy += mLastY ; mPath . lineTo ( mLastX = dx , mLastY = dy ) ; }
same as lineto , but the coordinates are considered relative to the last point on this contour . if there is no previous point , then a moveto ( 0 , 0 ) is inserted automatically .
