cgv::util: Introduce option to use fixed notation when converting flo…

…ats to string

cgv/utils/convert_string.cxx

@@ -4,7 +4,7 @@ namespace cgv {
 	namespace utils {
 
 template <>
-std::string to_string(const std::string& v, unsigned int w, unsigned int p)
+std::string to_string(const std::string& v, unsigned int w, unsigned int p, bool)
 {
 	return v;
 }

cgv/utils/convert_string.h

@@ -15,9 +15,11 @@ namespace cgv {
 
 /// convert a numeric type \c T into string of width \c w and precision \c p
 template <typename T>
-std::string to_string(const T& v, unsigned int w = -1, unsigned int p = -1)
+std::string to_string(const T& v, unsigned int w = -1, unsigned int p = -1, bool fixed=false)
 {
 	std::stringstream ss;
+	if (fixed)
+		ss << std::fixed;
 	if (w != (unsigned int)-1)
 		ss << std::setw(w);
 	if (p != (unsigned int)-1)
@@ -36,7 +38,7 @@ std::string to_string(const T& v, unsigned int w, char fill_char)
 }
 
 /// specialization of conversion from string to strings
-template <> CGV_API std::string to_string(const std::string& v, unsigned int w, unsigned int p);
+template <> CGV_API std::string to_string(const std::string& v, unsigned int w, unsigned int p, bool);
 
 /// extract value from string
 template <typename T>

libs/cgv_app/color_map_legend.cxx

@@ -367,12 +367,12 @@ void color_map_legend::create_labels() {
 		float t = fi / static_cast<float>(num_ticks - 1);
 		float val = cgv::math::lerp(range.x(), range.y(), t);
 
-		std::string str = "";
+		std::string str;
 
 		if(label_integer_mode)
 			str = std::to_string(static_cast<int>(round(val)));
 		else
-			str = cgv::utils::to_string(val, -1, precision);
+			str = cgv::utils::to_string(val, -1, precision, /*fixed*/true);
 
 		labels.add_text(str, ivec2(0), cgv::render::TextAlignment::TA_NONE);
 		max_length = std::max(max_length, labels.ref_texts().back().size.x());