gpl: add veritcal makers to the chart on TD & RD iterations

Signed-off-by: Matt Liberty <mliberty@precisioninno.com>

Author: maliberty

src/gpl/src/graphics.cpp

@@ -400,6 +400,18 @@ void Graphics::addIter(const int iter)
   chart_->addPoint(iter, block->dbuToMicrons(nbc_->getHpwl()));
 }
 
+void Graphics::addTimingDrivenIter(const int iter)
+{
+  chart_->addVerticalMarker(iter, gui::Painter::kTurquoise);
+}
+
+void Graphics::addRoutabilityIter(const int iter, const bool revert)
+{
+  gui::Painter::Color color
+      = revert ? gui::Painter::kRed : gui::Painter::kGreen;
+  chart_->addVerticalMarker(iter, color);
+}
+
 void Graphics::cellPlot(bool pause)
 {
   gui::Gui::get()->redraw();

src/gpl/src/graphics.h

@@ -56,6 +56,8 @@ class Graphics : public gui::Renderer, public gui::HeatMapDataSource
 
   // Update the chart for the current iter
   void addIter(int iter);
+  void addTimingDrivenIter(int iter);
+  void addRoutabilityIter(int iter, bool revert);
 
   // Draw the MBFF mapping
   void mbffMapping(const LineSegs& segs);

src/gpl/src/nesterovPlace.cpp

@@ -521,6 +521,10 @@ int NesterovPlace::doNesterovPlace(int start_iter)
       // update db's instance location from current density coordinates
       updateDb();
 
+      if (graphics_) {
+        graphics_->addTimingDrivenIter(iter);
+      }
+
       if (graphics_ && npVars_.debug_generate_images) {
         graphics_->saveLabeledImage(
             fmt::format("{}/timing_{:05d}_0.png", timing_driven_dir, iter),
@@ -815,6 +819,10 @@ int NesterovPlace::doNesterovPlace(int start_iter)
       is_routability_need_ = result.first;
       bool isRevertInitNeeded = result.second;
 
+      if (graphics_) {
+        graphics_->addRoutabilityIter(iter, isRevertInitNeeded);
+      }
+
       // if routability is needed
       if (is_routability_need_ || isRevertInitNeeded) {
         // revert back the current density penality