feat: draw PID limit boxes on eta vs. P plot in CI

Author: c-dilks

macro/ci/postprocess_eta_vs_p_forPID.C

@@ -6,9 +6,46 @@ R__LOAD_LIBRARY(EpicAnalysis)
 // plot eta vs. p in one bin, for PID coverage requests
 void postprocess_eta_vs_p_forPID(TString infile="out/coverage.fastsim.root") {
   PostProcessor *P = new PostProcessor(infile);
-  P->Op()->Payload( [&P](Histos *H) {
-      P->DrawSingle(H,"etaVsP","COLZ");
-      });
+  auto draw_payload = [&P] (Histos *H) {
+    auto draw_formatting = [] (auto hist, auto canv) {
+      gStyle->SetPalette(kBird);
+      std::vector<std::tuple<TString,TBox*,Color_t>> limits;
+      limits.push_back({
+          "#splitline{dRICH}{gas}",
+          new TBox(
+              9.5,  // p min
+              1.3,  // eta min
+              50.0, // p max
+              3.7   // eta max
+              ),
+          kRed
+          });
+      limits.push_back({
+          "#splitline{dRICH}{aerogel}",
+          new TBox(
+              2.0,  // p min
+              1.3,  // eta min
+              10.3, // p max
+              3.7   // eta max
+              ),
+          kBlue
+          });
+      for(auto [name,box,color] : limits) {
+        auto box_line = (TBox*) box->Clone();
+        box->SetFillColorAlpha(color,0.3);
+        box->Draw();
+        box_line->SetLineWidth(3);
+        box_line->SetFillStyle(kFEmpty);
+        box_line->SetLineColor(color);
+        box_line->Draw();
+        auto text = new TLatex(1.1*box->GetX1(), (box->GetY1()+box->GetY2())/2, name);
+        text->SetTextColor(color);
+        text->Draw();
+      }
+    };
+    P->DrawSingle(H, "etaVsP", "COLZ", 0, false, draw_formatting);
+  };
+  P->Op()->Payload(draw_payload);
   P->Execute();
   P->Finish(); 
 }

src/PostProcessor.cxx

@@ -222,8 +222,17 @@ void PostProcessor::FinishDumpAve(TString datFile) {
  * - `profileAxis` will draw a TProfile on the specified axis, for 2D dists
  *   - 0=disabled(default), 1=x-axis, 2=y-axis
  * - `profileOnly` draw only the TProfile, for 2D dists
+ * - `extra_lambda` can be used to apply additional custom formatting, etc.
  */
-void PostProcessor::DrawSingle(Histos *H, TString histName, TString drawFormat, Int_t profileAxis, Bool_t profileOnly) {
+void PostProcessor::DrawSingle(
+    Histos  *H,
+    TString histName,
+    TString drawFormat,
+    Int_t   profileAxis,
+    Bool_t  profileOnly,
+    std::function<void(TH1*,TCanvas*)> extra_lambda
+    )
+{
   cout << "draw single plot " << histName << "..." << endl;
   TH1 *hist = H->Hist(histName);
   if(hist==nullptr) {
@@ -275,6 +284,10 @@ void PostProcessor::DrawSingle(Histos *H, TString histName, TString drawFormat,
     prof->Write();
   }
 
+  // apply custom formatting
+  extra_lambda(hist, canv);
+
+  // print and write
   canv->Print(pngDir+"/"+canvN+".png");
   outfile->cd("/");
   canv->Write();

src/PostProcessor.h

@@ -5,6 +5,7 @@
 
 #include <map>
 #include <iomanip>
+#include <functional>
 
 // root
 #include "TFile.h"
@@ -69,7 +70,14 @@ class PostProcessor
     // - you are welcome to add your own algorithms
     void DumpHist(TString datFile, TString histSet, TString varName);
     void DumpAve(TString datFile, Histos *H, TString cutName);
-    void DrawSingle(Histos *H, TString histName, TString drawFormat="", Int_t profileAxis=0, Bool_t profileOnly=false);
+    void DrawSingle(
+        Histos  *H,
+        TString histName,
+        TString drawFormat  = "",
+        Int_t   profileAxis = 0,
+        Bool_t  profileOnly = false,
+        std::function<void(TH1*,TCanvas*)> extra_lambda = [] (TH1* h, TCanvas *c) {}
+        );
     void DrawSingle(TString histSet, TString histName);
     void DrawRatios(
         TString outName, Histos *numerSet, Histos *denomSet, Bool_t plotRatioOnly=false