tox private impl + dht caps histo

src/tox_dht_cap_histo.cpp

@@ -0,0 +1,69 @@
+#include "./tox_dht_cap_histo.hpp"
+
+#include <imgui/imgui.h>
+
+void ToxDHTCapHisto::tick(float time_delta) {
+	if (!_enabled) {
+		return;
+	}
+
+	_time_since_last_add += time_delta;
+	if (_time_since_last_add >= _value_add_interval) {
+		_time_since_last_add = 0.f; // very loose
+
+		const auto total = _tpi.toxDHTGetNumCloselist();
+		const auto with_cap = _tpi.toxDHTGetNumCloselistAnnounceCapable();
+
+		if (total == 0 || with_cap == 0) {
+			_ratios.push_back(0.f);
+		} else {
+			_ratios.push_back(float(with_cap) / float(total));
+		}
+
+		// TODO: limit
+		while (_ratios.size() > 5*60) {
+			_ratios.erase(_ratios.begin());
+		}
+	}
+}
+
+void ToxDHTCapHisto::render(void) {
+	{ // main window menubar injection
+		// assumes the window "tomato" was rendered already by cg
+		if (ImGui::Begin("tomato")) {
+			if (ImGui::BeginMenuBar()) {
+				ImGui::Separator();
+				if (ImGui::BeginMenu("Tox")) {
+					ImGui::SeparatorText("DHT diagnostics");
+
+					ImGui::Checkbox("enabled", &_enabled);
+
+					if (ImGui::MenuItem("show DHT announce capability histogram")) {
+						_show_window = true;
+					}
+
+					ImGui::EndMenu();
+				}
+				ImGui::EndMenuBar();
+			}
+
+		}
+		ImGui::End();
+	}
+
+
+	if (_show_window) {
+		if (ImGui::Begin("Tox DHT announce capability histogram", &_show_window)) {
+			if (_enabled) {
+				ImGui::PlotHistogram("##histogram", _ratios.data(), _ratios.size(), 0, nullptr, 0.f, 1.f, {-1, -1});
+			} else {
+				ImGui::TextUnformatted("logging disabled!");
+				if (ImGui::Button("enable")) {
+					_enabled = true;
+				}
+			}
+		}
+		ImGui::End();
+	}
+}
+