init

shared/Graph.h

@@ -0,0 +1,77 @@
+#pragma once
+
+#include <lvk/LVK.h>
+
+#include <deque>
+#include <vector>
+
+class LinearGraph
+{
+public:
+  explicit LinearGraph(const char* name, size_t maxGraphPoints = 256)
+  : name_(name)
+  , maxPoints_(maxGraphPoints)
+  {
+  }
+
+  void addPoint(float value)
+  {
+    graph_.push_back(value);
+    if (graph_.size() > maxPoints_)
+      graph_.erase(graph_.begin());
+  }
+
+  void renderGraph(uint32_t x, uint32_t y, uint32_t width, uint32_t height, const glm::vec4& color = vec4(1.0)) const
+  {
+    LVK_PROFILER_FUNCTION();
+
+    float minVal = std::numeric_limits<float>::max();
+    float maxVal = std::numeric_limits<float>::min();
+
+    for (float f : graph_) {
+      if (f < minVal)
+        minVal = f;
+      if (f > maxVal)
+        maxVal = f;
+    }
+
+    const float range = maxVal - minVal;
+
+    float valX = 0.0;
+
+    std::vector<float> dataX_;
+    std::vector<float> dataY_;
+    dataX_.reserve(graph_.size());
+    dataY_.reserve(graph_.size());
+
+    for (float f : graph_) {
+      const float valY = (f - minVal) / range;
+      valX += 1.0f / maxPoints_;
+      dataX_.push_back(valX);
+      dataY_.push_back(valY);
+    }
+
+    ImGui::SetNextWindowPos(ImVec2(x, y));
+    ImGui::SetNextWindowSize(ImVec2(width, height));
+    ImGui::Begin(
+        name_, nullptr,
+        ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoSavedSettings |
+            ImGuiWindowFlags_NoFocusOnAppearing | ImGuiWindowFlags_NoNav | ImGuiWindowFlags_NoBackground | ImGuiWindowFlags_NoInputs);
+
+    if (ImPlot::BeginPlot(name_, ImVec2(width, height), ImPlotFlags_CanvasOnly | ImPlotFlags_NoFrame | ImPlotFlags_NoInputs)) {
+      ImPlot::SetupAxes(nullptr, nullptr, ImPlotAxisFlags_NoDecorations, ImPlotAxisFlags_NoDecorations);
+      ImPlot::PushStyleColor(ImPlotCol_Line, ImVec4(color.r, color.g, color.b, color.a));
+      ImPlot::PushStyleColor(ImPlotCol_PlotBg, ImVec4(0, 0, 0, 0));
+      ImPlot::PlotLine("#line", dataX_.data(), dataY_.data(), (int)graph_.size(), ImPlotLineFlags_None);
+      ImPlot::PopStyleColor(2);
+      ImPlot::EndPlot();
+    }
+
+    ImGui::End();
+  }
+
+private:
+  const char* name_ = nullptr;
+  const size_t maxPoints_;
+  std::deque<float> graph_;
+};