Merge branch 'fix-variable-line' into 'master'

Fix display of variable lines with no variation or with invalid values

See merge request !21

src/common/Tools.cpp

@@ -57,6 +57,11 @@
 using namespace std;
 
 bool convert_to_double(const std::string &arg, double *val) {
+    if (arg.compare("-nan") == 0 || arg.compare("nan") == 0 || arg.compare("inf") == 0) {
+        *val = 0;
+        return true;
+    }
+
     int nb_read;
     // Try to convert first in the current locale
     sscanf(arg.c_str(), "%lf%n", val, &nb_read);

src/trace/DrawTrace.hpp

@@ -50,6 +50,7 @@
 
 #include <iostream>
 #include <cassert>
+#include <cmath>
 
 /*
  * Theses constants can not be put as static const float because it is a template and there binary representation is not normed by the C++ langage.
@@ -529,7 +530,15 @@ public:
                         /* Call the object state drawing function.
                          We pass the first value if correspond to the beginning */
                         first_value = variable_value.first.get_value();
-                        second_value =(variable_value.second.get_value()-min)/(max-min) ;
+
+                        // min and max can be equal if all values are equal (ie 0) or if there is only one value for the variable
+                        if (fabs(max-min) < std::numeric_limits<double>::epsilon()) {
+                            second_value = 0;
+                        }
+                        else {
+                            second_value =(variable_value.second.get_value()-min)/(max-min);
+                        }
+
                         if(!(first_value == 0. && second_value == 0.)) {
                             draw_variable_value(draw_object, first_value, second_value, position);
                         }