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#include <format>
#include <string_view>
#include <catch2/catch_all.hpp>
#include "svg_analyzer.h"
#include "test_utilities.h"
TEST_CASE("Graph rankdir", "Test that the Graphviz `rankdir` attribute affects "
"the relative placement of nodes and edges "
"correctly when the 'dot` layout engine is used") {
const auto rankdir = GENERATE(from_range(all_rank_directions));
INFO("Rankdir: " << rankdir);
const auto shape = GENERATE(filter(
[](std::string_view s) {
return !node_shapes_without_svg_shape.contains(s);
},
from_range(all_node_shapes)));
INFO("Shape: " << shape);
auto dot = std::format(
"digraph g1 {{rankdir={}; node [shape={} fontname=Courier]; a -> b}}",
rankdir, shape);
const auto engine = "dot";
auto svg_analyzer = SVGAnalyzer::make_from_dot(dot, engine);
REQUIRE(svg_analyzer.graphs().size() == 1);
const auto &graph = svg_analyzer.graphs().back();
const auto node_a = graph.node("a");
const auto node_b = graph.node("b");
const auto edge_ab = graph.edge("a->b");
if (rankdir == "TB") {
CHECK(node_a.center().is_higher_than(node_b.center()));
CHECK(node_a.center().is_higher_than(edge_ab.center()));
CHECK(edge_ab.center().is_higher_than(node_b.center()));
} else if (rankdir == "BT") {
CHECK(node_a.center().is_lower_than(node_b.center()));
CHECK(node_a.center().is_lower_than(edge_ab.center()));
CHECK(edge_ab.center().is_lower_than(node_b.center()));
} else if (rankdir == "LR") {
CHECK(node_a.center().is_more_left_than(node_b.center()));
CHECK(node_a.center().is_more_left_than(edge_ab.center()));
CHECK(edge_ab.center().is_more_left_than(node_b.center()));
} else if (rankdir == "RL") {
CHECK(node_a.center().is_more_right_than(node_b.center()));
CHECK(node_a.center().is_more_right_than(edge_ab.center()));
CHECK(edge_ab.center().is_more_right_than(node_b.center()));
}
}
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