本文整理汇总了C++中VertexList::find方法的典型用法代码示例。如果您正苦于以下问题：C++ VertexList::find方法的具体用法？C++ VertexList::find怎么用？C++ VertexList::find使用的例子？那么恭喜您, 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VertexList的用法示例。
在下文中一共展示了VertexList::find方法的1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: dump_graph_to_png_file
void dump_graph_to_png_file(const AdjacencyList &adjacency_list,
const VertexList &vertex_list,
const char *png_filename)
{
auto bbox = get_aabb(vertex_list);
double width = bbox.maxx - bbox.minx;
double height = bbox.maxy - bbox.miny;
auto surface = std::shared_ptr<cairo_surface_t>(
cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, height),
cairo_surface_destroy);
check_cairo_surface_status(surface.get());
auto cr = std::shared_ptr<cairo_t>(
cairo_create(surface.get()),
cairo_destroy);
check_cairo_status(cr.get());
cairo_set_line_width(cr.get(), 1.0);
for (const auto &edge: adjacency_list) {
auto u = vertex_list.find(std::get<0>(edge));
if (u == vertex_list.end()) {
std::cout << "[WARNING] reference to non-existing vertex "
<< std::get<0>(edge) << std::endl;
continue;
}
for (const auto &way: std::get<1>(edge)) {
auto v = vertex_list.find(way.destination);
if (v == vertex_list.end()) {
std::cout << "[WARNING] reference to non-existing vertex "
<< way.destination << std::endl;
continue;
}
switch (way.type) {
case 0:
cairo_set_source_rgb(cr.get(), 1.0, 0.0, 0.0);
break;
case 1:
cairo_set_source_rgb(cr.get(), 0.0, 1.0, 0.0);
break;
case 2:
cairo_set_source_rgb(cr.get(), 0.0, 0.0, 1.0);
break;
default:
std::cout << "[WARNING] Wrong type of arc" << std::endl;
}
cairo_move_to(cr.get(),
u->second.x - bbox.minx,
height - (u->second.y - bbox.miny));
cairo_line_to(cr.get(),
v->second.x - bbox.minx,
height - (v->second.y - bbox.miny));
cairo_stroke(cr.get());
}
}
{
auto status = cairo_surface_write_to_png(surface.get(), png_filename);
cairo_status_to_exception(status);
}
}