add to gui

gui/gui.cpp

@@ -136,17 +136,41 @@ void Gui::render(const EngineStats& stats) {
 
     ImGui::Columns(2, "main_columns");
 
-    // --- Left column: primary live readouts ---
+    // --- (0,0): primary live readouts — tach + throttle lever side by side ---
     DrawTachGauge(static_cast<float>(stats.rpm), static_cast<float>(stats.max_rpm),
                   static_cast<float>(stats.redline_rpm), 220.0f);
 
+    ImGui::SameLine();
+    ImGui::VSliderFloat("##throttle_lever", ImVec2(40, 160), &m_throttle_lever, 0.0f, 1.0f, "");
+    // VSliderFloat is only "active" while the mouse is down on it, so
+    // this is the spring-back: anything other than an active drag
+    // resets the lever to closed, including on release.
+    if (!ImGui::IsItemActive()) {
+        m_throttle_lever = 0.0f;
+    }
+    ImGui::SameLine();
+    ImGui::Text("Throttle\n%.0f%%", m_throttle_lever * 100.0f);
+
+    // Row 1 starts here in both columns, so column 1's content below
+    // lines up with column 0's regardless of which column is taller.
+    float row1_y = ImGui::GetCursorPosY();
+
+    // --- (1,0): fuel/power readouts + accessory toggles ---
     ImGui::Text("Fuel Consumption: %.2f L/h", stats.fuel_consumption_lph);
     ImGui::Text("Crank Power: %.2f kW", stats.crank_power_kw);
     ImGui::Text("Output Heat: %.1f J", stats.output_heat_j);
 
+    ImGui::Spacing();
+    ImGui::Separator();
+    ImGui::Text("Accessories");
+    ImGui::Checkbox("Alternator", &m_accessories.alternator);
+    ImGui::Checkbox("A/C", &m_accessories.ac);
+    ImGui::Checkbox("Power Steering", &m_accessories.power_steering);
+
     ImGui::NextColumn();
 
-    // --- Right column: extensible stats list (oil temp, coolant temp, ...) ---
+    // --- (1,1): extensible stats list (oil temp, coolant temp, ...) ---
+    ImGui::SetCursorPosY(row1_y);
     ImGui::Text("Stats");
     ImGui::Separator();
     for (const StatEntry& s : stats.extra_stats) {