public int step_ver_base(distance_interpolator3 di)
{
m_li.Next();
m_y += m_lp.inc;
m_x = (m_lp.x1 + m_li.y()) >> LineAABasics.line_subpixel_shift;
if (m_lp.inc > 0) di.inc_y(m_x - m_old_x);
else di.dec_y(m_x - m_old_x);
m_old_x = m_x;
return di.dist() / m_len;
}
//typedef Renderer renderer_type;
//typedef line_interpolator_aa_base<Renderer> base_type;
//---------------------------------------------------------------------
public line_interpolator_aa3(OutlineRenderer ren, line_parameters lp,
int sx, int sy, int ex, int ey)
:
base(ren, lp)
{
m_di = new distance_interpolator3(lp.x1, lp.y1, lp.x2, lp.y2, sx, sy, ex, ey,
lp.x1 & ~LineAABasics.line_subpixel_mask, lp.y1 & ~LineAABasics.line_subpixel_mask);
int dist1_start;
int dist2_start;
int npix = 1;
if (lp.vertical)
{
do
{
base.m_li.Prev();
base.m_y -= lp.inc;
base.m_x = (base.m_lp.x1 + base.m_li.y()) >> LineAABasics.line_subpixel_shift;
if (lp.inc > 0) m_di.dec_y(base.m_x - base.m_old_x);
else m_di.inc_y(base.m_x - base.m_old_x);
base.m_old_x = base.m_x;
dist1_start = dist2_start = m_di.dist_start();
int dx = 0;
if (dist1_start < 0) ++npix;
do
{
dist1_start += m_di.dy_start();
dist2_start -= m_di.dy_start();
if (dist1_start < 0) ++npix;
if (dist2_start < 0) ++npix;
++dx;
}
while (base.m_dist[dx] <= base.m_width);
if (npix == 0) break;
npix = 0;
}
while (--base.m_step >= -base.m_max_extent);
}
else
{
do
{
base.m_li.Prev();
base.m_x -= lp.inc;
base.m_y = (base.m_lp.y1 + base.m_li.y()) >> LineAABasics.line_subpixel_shift;
if (lp.inc > 0) m_di.dec_x(base.m_y - base.m_old_y);
else m_di.inc_x(base.m_y - base.m_old_y);
base.m_old_y = base.m_y;
dist1_start = dist2_start = m_di.dist_start();
int dy = 0;
if (dist1_start < 0) ++npix;
do
{
dist1_start -= m_di.dx_start();
dist2_start += m_di.dx_start();
if (dist1_start < 0) ++npix;
if (dist2_start < 0) ++npix;
++dy;
}
while (base.m_dist[dy] <= base.m_width);
if (npix == 0) break;
npix = 0;
}
while (--base.m_step >= -base.m_max_extent);
}
base.m_li.adjust_forward();
base.m_step -= base.m_max_extent;
}