void transform_at(unsigned pos,const CoordTransform& t)
{
if (pos >= pos_) return;
unsigned block = pos >> block_shift;
value_type* vertex = vertexs_[block] + (( pos & block_mask) << 1);
t.forward_x(vertex);
++vertex;
t.forward_y(vertex);
}
void image_symbolizer::render(Feature const& feat,CoordTransform const& t,Image32& image) const
{
geometry_ptr const& geom=feat.get_geometry();
if (geom)
{
double x;
double y;
geom->label_position(&x,&y);
t.forward_x(&x);
t.forward_y(&y);
int w=symbol_.width();
int h=symbol_.height();
int px=int(ceil(x - 0.5 * w));
int py=int(ceil(y - 0.5 * h));
image.set_rectangle_alpha(px,py,symbol_);
}
}
