implot: add new plot library

app/gui/CMakeLists.txt

@@ -2,8 +2,8 @@ cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
 project(irritator-gui VERSION 0.1.0 LANGUAGES CXX)
 
 set(gui_sources
-    dialog-file.cpp gui.hpp imnodes.cpp imnodes.hpp window-logger.cpp
-    node-editor.hpp node-editor.cpp
+    dialog-file.cpp gui.hpp imnodes.cpp imnodes.hpp implot.h implot.cpp
+    window-logger.cpp node-editor.hpp node-editor.cpp
     ${PROJECT_SOURCE_DIR}/../../external/imgui/imgui.cpp
     ${PROJECT_SOURCE_DIR}/../../external/imgui/imgui.h
     ${PROJECT_SOURCE_DIR}/../../external/imgui/imgui_demo.cpp

app/gui/node-editor.cpp

@@ -10,6 +10,7 @@
 #include "node-editor.hpp"
 #include "gui.hpp"
 #include "imnodes.hpp"
+#include "implot.h"
 
 #include <fstream>
 #include <string>
@@ -38,8 +39,7 @@ static auto automatic_layout_y_distance = 350.f;
 static auto grid_layout_x_distance = 250.f;
 static auto grid_layout_y_distance = 250.f;
 
-static ImVec4
-operator*(const ImVec4& lhs, const float rhs) noexcept
+static ImVec4 operator*(const ImVec4& lhs, const float rhs) noexcept
 {
     return ImVec4(lhs.x * rhs, lhs.y * rhs, lhs.z * rhs, lhs.w * rhs);
 }
@@ -659,8 +659,9 @@ struct copier
 
             auto ret = sim.dispatch(
               mdl->type,
-              [this, &sim, mdl, &mdl_id_dst]<typename DynamicsM>(
-                DynamicsM& dynamics_models) -> status {
+              [ this, &sim, mdl, &
+                mdl_id_dst ]<typename DynamicsM>(DynamicsM & dynamics_models)
+                ->status {
                     using Dynamics = typename DynamicsM::value_type;
 
                     irt_return_if_fail(dynamics_models.can_alloc(1),
@@ -2618,12 +2619,52 @@ node_editor_initialize()
     }
 }
 
+void
+show_plot_box(bool* show_plot)
+{
+    // static editor_id current_editor_id = static_cast<editor_id>(0);
+
+    ImGui::SetNextWindowSize(ImVec2(400, 400), ImGuiCond_Always);
+    if (!ImGui::Begin("Plot", show_plot)) {
+        ImGui::End();
+        return;
+    }
+
+    if (ImGui::CollapsingHeader("Line Plots")) {
+        static float xs1[1001], ys1[1001];
+        for (int i = 0; i < 1001; ++i) {
+            xs1[i] = (float)i * 0.001f;
+            ys1[i] = 0.5f + 0.5f * std::sin(50 * xs1[i]);
+        }
+        static float xs2[11], ys2[11];
+        for (int i = 0; i < 11; ++i) {
+            xs2[i] = (float)i * 0.1f;
+            ys2[i] = xs2[i] * xs2[i];
+        }
+        static float weight = ImPlot::GetStyle().LineWeight;
+        ImGui::BulletText("Anti-aliasing can be enabled from the plot's "
+                          "context menu (see Help).");
+        ImGui::DragFloat("Line Weight", &weight, 0.05f, 1.0f, 5.0f, "%.2f px");
+        if (ImPlot::BeginPlot("Line Plot", "x", "f(x)")) {
+            ImPlot::PushStyleVar(ImPlotStyleVar_LineWeight, weight);
+            ImPlot::PlotLine("0.5 + 0.5*sin(50*x)", xs1, ys1, 1001);
+            ImPlot::PushStyleVar(ImPlotStyleVar_Marker, ImPlotMarker_Circle);
+            ImPlot::PlotLine("x^2", xs2, ys2, 11);
+            ImPlot::PopStyleVar(2);
+            ImPlot::EndPlot();
+        }
+    }
+
+    ImGui::End();
+}
+
 bool
 node_editor_show()
 {
     static bool show_log = true;
     static bool show_simulation = true;
     static bool show_demo = false;
+    static bool show_plot = false;
     static bool show_settings = false;
     bool ret = true;
 
@@ -2647,7 +2688,7 @@ node_editor_show()
                 ImGui::MenuItem(ed->name.c_str(), nullptr, &ed->show);
 
             ImGui::MenuItem("Simulation", nullptr, &show_simulation);
-
+            ImGui::MenuItem("Plot", nullptr, &show_plot);
             ImGui::MenuItem("Settings", nullptr, &show_settings);
             ImGui::MenuItem("Log", nullptr, &show_log);
 
@@ -2680,6 +2721,9 @@ node_editor_show()
     if (show_simulation)
         show_simulation_box(&show_simulation);
 
+    if (show_plot)
+        show_plot_box(&show_plot);
+
     if (show_demo)
         ImGui::ShowDemoWindow();