DecY() public method

public DecY ( int dx ) : void
dx int
return void
 //-------------------------------------------------------
 public int BaseStepV(DistanceInterpolator1 di)
 {
     m_li.Next();
     m_y += m_lp.inc;
     m_x  = (m_lp.x1 + m_li.Y) >> LineAA.SUBPIXEL_SHIFT;
     if (m_lp.inc > 0)
     {
         di.IncY(m_x - m_old_x);
     }
     else
     {
         di.DecY(m_x - m_old_x);
     }
     m_old_x = m_x;
     return(di.Distance / m_len);
 }
 //-------------------------------------------------------
 public int BaseStepV(DistanceInterpolator1 di)
 {
     m_li.Next();
     m_y += m_lp.inc;
     m_x = (m_lp.x1 + m_li.Y) >> LineAA.SUBPIXEL_SHIFT;
     if (m_lp.inc > 0) di.IncY(m_x - m_old_x);
     else di.DecY(m_x - m_old_x);
     m_old_x = m_x;
     return di.Distance / m_len;
 }