Add placefile layer with text rendering

scwx-qt/source/scwx/qt/map/placefile_layer.cpp

@@ -0,0 +1,104 @@
+#include <scwx/qt/map/placefile_layer.hpp>
+#include <scwx/util/logger.hpp>
+
+#include <fmt/format.h>
+#include <imgui.h>
+
+namespace scwx
+{
+namespace qt
+{
+namespace map
+{
+
+static const std::string logPrefix_ = "scwx::qt::map::placefile_layer";
+static const auto        logger_    = scwx::util::Logger::Create(logPrefix_);
+
+class PlacefileLayer::Impl
+{
+public:
+   explicit Impl(std::shared_ptr<MapContext> context) {};
+   ~Impl() = default;
+
+   void RenderText(const std::string&        text,
+                   const std::string&        hoverText,
+                   boost::gil::rgba8_pixel_t color,
+                   float                     x,
+                   float                     y);
+
+   std::uint32_t textId_ {};
+};
+
+PlacefileLayer::PlacefileLayer(std::shared_ptr<MapContext> context) :
+    DrawLayer(context), p(std::make_unique<PlacefileLayer::Impl>(context))
+{
+}
+
+PlacefileLayer::~PlacefileLayer() = default;
+
+void PlacefileLayer::Initialize()
+{
+   logger_->debug("Initialize()");
+
+   DrawLayer::Initialize();
+}
+
+void PlacefileLayer::Impl::RenderText(const std::string&        text,
+                                      const std::string&        hoverText,
+                                      boost::gil::rgba8_pixel_t color,
+                                      float                     x,
+                                      float                     y)
+{
+   const std::string windowName {fmt::format("PlacefileText-{}", ++textId_)};
+
+   // Setup "window" to hold text
+   ImGui::SetNextWindowPos(
+      ImVec2 {x, y}, ImGuiCond_Always, ImVec2 {0.5f, 0.5f});
+   ImGui::Begin(windowName.c_str(),
+                nullptr,
+                ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoNav |
+                   ImGuiWindowFlags_NoBackground);
+
+   // Render text
+   ImGui::PushStyleColor(ImGuiCol_Text,
+                         IM_COL32(color[0], color[1], color[2], color[3]));
+   ImGui::TextUnformatted(text.c_str());
+   ImGui::PopStyleColor();
+
+   // Create tooltip for hover text
+   if (!hoverText.empty() && ImGui::IsItemHovered())
+   {
+      ImGui::BeginTooltip();
+      ImGui::TextUnformatted(hoverText.c_str());
+      ImGui::EndTooltip();
+   }
+
+   // End window
+   ImGui::End();
+}
+
+void PlacefileLayer::Render(
+   const QMapLibreGL::CustomLayerRenderParameters& params)
+{
+   gl::OpenGLFunctions& gl = context()->gl();
+
+   DrawLayer::Render(params);
+
+   // Reset text ID per frame
+   p->textId_ = 0;
+
+   // Render text
+
+   SCWX_GL_CHECK_ERROR();
+}
+
+void PlacefileLayer::Deinitialize()
+{
+   logger_->debug("Deinitialize()");
+
+   DrawLayer::Deinitialize();
+}
+
+} // namespace map
+} // namespace qt
+} // namespace scwx