diff --git a/uppsrc/ScatterDraw/Equation.cpp b/uppsrc/ScatterDraw/Equation.cpp
index a40fa0cda..e97e9b689 100644
--- a/uppsrc/ScatterDraw/Equation.cpp
+++ b/uppsrc/ScatterDraw/Equation.cpp
@@ -122,13 +122,15 @@ String FourierEquation::GetEquation(int numDigits) {
 	return ret;
 }
 
+static double degToRad(double deg) {return M_PI/180.;}
 
 EvalExpr::EvalExpr() {
 	noCase = false;
 	
 	constants.Add("PI", M_PI);
 	constants.Add("M_PI", M_PI);
-	constants.Add("e", exp(1.0));
+	constants.Add("e", M_E);
+	
 	functions.Add("abs", fabs);
 	functions.Add("ceil", ceil);
 	functions.Add("floor", floor);
@@ -142,6 +144,7 @@ EvalExpr::EvalExpr() {
 	functions.Add("sinh", sinh);
 	functions.Add("cosh", cosh);
 	functions.Add("tanh", tanh);
+	functions.Add("degToRad", degToRad);
 }
 
 double EvalExpr::Term(CParser& p) {
diff --git a/uppsrc/ScatterDraw/Equation.h b/uppsrc/ScatterDraw/Equation.h
index 60e03daea..82f4426eb 100644
--- a/uppsrc/ScatterDraw/Equation.h
+++ b/uppsrc/ScatterDraw/Equation.h
@@ -234,6 +234,9 @@ public:
 	void GetVariable(int id, String &name, double &value)	{name = variables.GetKey(id); value = variables[id];}
 	int GetVariablesCount() 								{return variables.GetCount();}
 
+	VectorMap<String, double> constants;
+	VectorMap<String, double (*)(double)> functions;
+	
 private:
 	void *Functions_Get(CParser& p);
 	double Term(CParser& p);
@@ -245,10 +248,8 @@ private:
 	String MulStr(CParser& p, int numDigits);
 	String ExpStr(CParser& p, int numDigits);
 	bool noCase;
-	
-	VectorMap<String, double> constants;
+		
 	VectorMap<String, double> variables;
-	VectorMap<String, double (*)(double)> functions;
 };
 
 class UserEquation : public ExplicitEquation {