From f4069563f596b35d90a6a3b941011ebd7cf191b9 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Wed, 6 Feb 2019 14:18:14 +0100
Subject: Export and plot cylinder2d measurements

---
 .../cylinder2d/optimized_grid/cylinder2d.cpp       | 28 ++++++++++++----------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/apps/adrian/cylinder2d/optimized_grid/cylinder2d.cpp b/apps/adrian/cylinder2d/optimized_grid/cylinder2d.cpp
index 34294ee..e5a934c 100644
--- a/apps/adrian/cylinder2d/optimized_grid/cylinder2d.cpp
+++ b/apps/adrian/cylinder2d/optimized_grid/cylinder2d.cpp
@@ -214,12 +214,8 @@ void getResults(Grid2D<T,DESCRIPTOR>& grid,
   vtmWriter.write(iT);
 }
 
-void takeMeasurements(Grid2D<T,DESCRIPTOR>& grid)
+void takeMeasurements(Grid2D<T,DESCRIPTOR>& grid, int iT, bool print=true)
 {
-  static T maxDrag = 0.0;
-
-  OstreamManager clout(std::cout,"measurement");
-
   auto& sLattice  = grid.getSuperLattice();
   auto& sGeometry = grid.getSuperGeometry();
   auto& converter = grid.getConverter();
@@ -236,17 +232,23 @@ void takeMeasurements(Grid2D<T,DESCRIPTOR>& grid)
   T pressureInFrontOfCylinder, pressureBehindCylinder;
   intpolatePressure(&pressureInFrontOfCylinder, point1);
   intpolatePressure(&pressureBehindCylinder,    point2);
-
-  T pressureDrop = pressureInFrontOfCylinder - pressureBehindCylinder;
-  clout << "pressureDrop=" << pressureDrop;
+  const T pressureDrop = pressureInFrontOfCylinder - pressureBehindCylinder;
 
   const int input[3] {};
   T drag[dragF.getTargetDim()] {};
   dragF(drag, input);
-  if (drag[0] > maxDrag) {
-    maxDrag = drag[0];
-  };
-  clout << "; drag=" << drag[0] << "; maxDrag: " << maxDrag << "; lift=" << drag[1] << endl;
+
+  static Gnuplot<T> gplot("results");
+  gplot.setData(converter.getPhysTime(iT), {drag[0], drag[1], pressureDrop}, {"drag", "lift", "deltaP"}, "bottom right", {'l','l'});
+  gplot.writePNG();
+
+  if (print) {
+    OstreamManager clout(std::cout, "measurement");
+    clout << "pressureDrop=" << pressureDrop
+          << "; drag=" << drag[0]
+          << "; lift=" << drag[1]
+          << endl;
+  }
 }
 
 int main(int argc, char* argv[])
@@ -354,7 +356,7 @@ int main(int argc, char* argv[])
         getResults(grid, id, iT);
       });
 
-      takeMeasurements(fineGrid3);
+      takeMeasurements(fineGrid3, iT);
     }
   }
 
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