Added Plot::removePensFrom()

Author: highperformancecoder

include/plot.h

@@ -180,6 +180,9 @@ namespace ecolab
       penLabel.clear(); penTextLabel.clear(); penSide.clear();
     }
 
+    /// remove all pens from pen and above from plot
+    void removePensFrom(unsigned pen);
+    
 //    //serialisation support (surface is not auto-serialisable)
 //    void pack(classdesc::pack_t& p) const override {p<<m_image<<x<<y<<minx<<maxx<<miny<<maxy;}
 //

src/plot.cc

@@ -309,6 +309,13 @@ namespace ecolab
     penSide[pen]=side;
   }
 
+  void Plot::removePensFrom(unsigned pen)
+  {
+    if (x.size()>pen) x.resize(pen);
+    if (y.size()>pen) y.resize(pen);
+    redraw();
+  }
+  
   bool Plot::onlyMarkers() const
   {
     bool r=true;