本文整理汇总了C++中Converter::apply方法的典型用法代码示例。如果您正苦于以下问题：C++ Converter::apply方法的具体用法？C++ Converter::apply怎么用？C++ Converter::apply使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Converter的用法示例。
在下文中一共展示了Converter::apply方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: apply_markers_multi
void apply_markers_multi(feature_impl const& feature, attributes const& vars, Converter & converter, markers_symbolizer const& sym)
{
std::size_t geom_count = feature.paths().size();
if (geom_count == 1)
{
converter.apply(feature.paths()[0]);
}
else if (geom_count > 1)
{
marker_multi_policy_enum multi_policy = get<marker_multi_policy_enum>(sym, keys::markers_multipolicy, feature, vars, MARKER_EACH_MULTI);
marker_placement_enum placement = get<marker_placement_enum>(sym, keys::markers_placement_type, feature, vars, MARKER_POINT_PLACEMENT);
if (placement == MARKER_POINT_PLACEMENT &&
multi_policy == MARKER_WHOLE_MULTI)
{
double x, y;
if (label::centroid_geoms(feature.paths().begin(), feature.paths().end(), x, y))
{
geometry_type pt(geometry_type::types::Point);
pt.move_to(x, y);
// unset any clipping since we're now dealing with a point
converter.template unset<clip_poly_tag>();
converter.apply(pt);
}
}
else if ((placement == MARKER_POINT_PLACEMENT || placement == MARKER_INTERIOR_PLACEMENT) &&
multi_policy == MARKER_LARGEST_MULTI)
{
// Only apply to path with largest envelope area
// TODO: consider using true area for polygon types
double maxarea = 0;
geometry_type const* largest = 0;
for (geometry_type const& geom : feature.paths())
{
const box2d<double>& env = geom.envelope();
double area = env.width() * env.height();
if (area > maxarea)
{
maxarea = area;
largest = &geom;
}
}
if (largest)
{
converter.apply(*largest);
}
}
else
{
if (multi_policy != MARKER_EACH_MULTI && placement != MARKER_POINT_PLACEMENT)
{
MAPNIK_LOG_WARN(marker_symbolizer) << "marker_multi_policy != 'each' has no effect with marker_placement != 'point'";
}
for (geometry_type const& path : feature.paths())
{
converter.apply(path);
}
}
}
}示例2: apply_markers_multi
void apply_markers_multi(feature_impl const& feature, attributes const& vars, Converter & converter, symbolizer_base const& sym)
{
using vertex_converter_type = Converter;
using apply_vertex_converter_type = detail::apply_vertex_converter<vertex_converter_type>;
using vertex_processor_type = geometry::vertex_processor<apply_vertex_converter_type>;
auto const& geom = feature.get_geometry();
geometry::geometry_types type = geometry::geometry_type(geom);
if (type == geometry::geometry_types::Point
|| type == geometry::geometry_types::LineString
|| type == geometry::geometry_types::Polygon)
{
apply_vertex_converter_type apply(converter);
mapnik::util::apply_visitor(vertex_processor_type(apply), geom);
}
else
{
marker_multi_policy_enum multi_policy = get<marker_multi_policy_enum, keys::markers_multipolicy>(sym, feature, vars);
marker_placement_enum placement = get<marker_placement_enum, keys::markers_placement_type>(sym, feature, vars);
if (placement == MARKER_POINT_PLACEMENT &&
multi_policy == MARKER_WHOLE_MULTI)
{
geometry::point<double> pt;
// test if centroid is contained by bounding box
if (geometry::centroid(geom, pt) && converter.disp_.args_.bbox.contains(pt.x, pt.y))
{
// unset any clipping since we're now dealing with a point
converter.template unset<clip_poly_tag>();
geometry::point_vertex_adapter<double> va(pt);
converter.apply(va);
}
}
else if ((placement == MARKER_POINT_PLACEMENT || placement == MARKER_INTERIOR_PLACEMENT) &&
multi_policy == MARKER_LARGEST_MULTI)
{
// Only apply to path with largest envelope area
// TODO: consider using true area for polygon types
if (type == geometry::geometry_types::MultiPolygon)
{
geometry::multi_polygon<double> const& multi_poly = mapnik::util::get<geometry::multi_polygon<double> >(geom);
double maxarea = 0;
geometry::polygon<double> const* largest = 0;
for (geometry::polygon<double> const& poly : multi_poly)
{
box2d<double> bbox = geometry::envelope(poly);
geometry::polygon_vertex_adapter<double> va(poly);
double area = bbox.width() * bbox.height();
if (area > maxarea)
{
maxarea = area;
largest = &poly;
}
}
if (largest)
{
geometry::polygon_vertex_adapter<double> va(*largest);
converter.apply(va);
}
}
else
{
MAPNIK_LOG_WARN(marker_symbolizer) << "TODO: if you get here -> open an issue";
}
}
else
{
if (multi_policy != MARKER_EACH_MULTI && placement != MARKER_POINT_PLACEMENT)
{
MAPNIK_LOG_WARN(marker_symbolizer) << "marker_multi_policy != 'each' has no effect with marker_placement != 'point'";
}
apply_vertex_converter_type apply(converter);
mapnik::util::apply_visitor(vertex_processor_type(apply), geom);
}
}
}