SGPath rename wrapper. Let's see what Win32 makes of it.

[simgear.git] / simgear / structure / SGExpression.hxx

diff --git a/simgear/structure/SGExpression.hxx b/simgear/structure/SGExpression.hxx
index 05fc8336f9fd1f7b8c5e6b02b9dbf0c75757d331..420a9045ce001926310942e49e4ffbdaa21b2327 100644 (file)
--- a/simgear/structure/SGExpression.hxx
+++ b/simgear/structure/SGExpression.hxx
@@ -122,6 +122,9 @@ public:
   T getValue(const simgear::expression::Binding* binding = 0) const
   { T value; eval(value, binding); return value; }
 
+  double getDoubleValue(const simgear::expression::Binding* binding = 0) const
+  { T value; eval(value, binding); return value; }
+
   virtual bool isConst() const { return false; }
   virtual SGExpression* simplify();
   virtual simgear::expression::Type getType() const
@@ -319,7 +322,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = acos(SGMisc<T>::clip(getOperand()->getValue(b), -1, 1)); }
+  { value = acos((double)SGMisc<T>::clip(getOperand()->getValue(b), -1, 1)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -332,7 +335,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = asin(SGMisc<T>::clip(getOperand()->getValue(b), -1, 1)); }
+  { value = asin((double)SGMisc<T>::clip(getOperand()->getValue(b), -1, 1)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -345,7 +348,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = atan(getOperand()->getValue(b)); }
+  { value = atan(getOperand()->getDoubleValue(b)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -358,7 +361,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = ceil(getOperand()->getValue(b)); }
+  { value = ceil(getOperand()->getDoubleValue(b)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -371,7 +374,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = cos(getOperand()->getValue(b)); }
+  { value = cos(getOperand()->getDoubleValue(b)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -384,7 +387,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = cosh(getOperand()->getValue(b)); }
+  { value = cosh(getOperand()->getDoubleValue(b)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -397,7 +400,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = exp(getOperand()->getValue(b)); }
+  { value = exp(getOperand()->getDoubleValue(b)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -410,7 +413,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = floor(getOperand()->getValue(b)); }
+  { value = floor(getOperand()->getDoubleValue(b)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -423,7 +426,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = log(getOperand()->getValue(b)); }
+  { value = log(getOperand()->getDoubleValue(b)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -436,7 +439,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = log10(getOperand()->getValue(b)); }
+  { value = log10(getOperand()->getDoubleValue(b)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -449,7 +452,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = sin(getOperand()->getValue(b)); }
+  { value = sin(getOperand()->getDoubleValue(b)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -462,7 +465,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = sinh(getOperand()->getValue(b)); }
+  { value = sinh(getOperand()->getDoubleValue(b)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -488,7 +491,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = sqrt(getOperand()->getValue(b)); }
+  { value = sqrt(getOperand()->getDoubleValue(b)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -501,7 +504,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = tan(getOperand()->getValue(b)); }
+  { value = tan(getOperand()->getDoubleValue(b)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -514,7 +517,7 @@ public:
   { }
 
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = tanh(getOperand()->getValue(b)); }
+  { value = tanh(getOperand()->getDoubleValue(b)); }
 
   using SGUnaryExpression<T>::getOperand;
 };
@@ -662,24 +665,16 @@ public:
 private:
   T apply_mods(T property) const
   {
-    T modprop;
-    if (_step > 0) {
-      T scrollval = 0;
-      if(_scroll > 0) {
-        // calculate scroll amount (for odometer like movement)
-        T remainder  =  _step - fmod(fabs(property), _step);
-        if (remainder < _scroll) {
-          scrollval = (_scroll - remainder) / _scroll * _step;
-        }
-      }
-      // apply stepping of input value
-      if(property > 0)
-        modprop = ((floor(property/_step) * _step) + scrollval);
-      else
-        modprop = ((ceil(property/_step) * _step) + scrollval);
-    } else {
-      modprop = property;
-    }
+    if( _step <= SGLimits<T>::min() ) return property;
+
+    // apply stepping of input value
+    T modprop = floor(property/_step)*_step;
+
+    // calculate scroll amount (for odometer like movement)
+    T remainder = property <= SGLimits<T>::min() ? -fmod(property,_step) : (_step - fmod(property,_step));
+    if( remainder > SGLimits<T>::min() && remainder < _scroll )
+      modprop += (_scroll - remainder) / _scroll * _step;
+
     return modprop;
   }
 
@@ -731,7 +726,7 @@ public:
     : SGBinaryExpression<T>(expr0, expr1)
   { }
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = atan2(getOperand(0)->getValue(b), getOperand(1)->getValue(b)); }
+  { value = atan2(getOperand(0)->getDoubleValue(b), getOperand(1)->getDoubleValue(b)); }
   using SGBinaryExpression<T>::getOperand;
 };
 
@@ -771,7 +766,7 @@ public:
     : SGBinaryExpression<T>(expr0, expr1)
   { }
   virtual void eval(T& value, const simgear::expression::Binding* b) const
-  { value = pow(getOperand(0)->getValue(b), getOperand(1)->getValue(b)); }
+  { value = pow(getOperand(0)->getDoubleValue(b), getOperand(1)->getDoubleValue(b)); }
   using SGBinaryExpression<T>::getOperand;
 };
 
@@ -794,6 +789,25 @@ public:
   using SGNaryExpression<T>::getOperand;
 };
 
+template<typename T>
+class SGDifferenceExpression : public SGNaryExpression<T> {
+public:
+  SGDifferenceExpression()
+  { }
+  SGDifferenceExpression(SGExpression<T>* expr0, SGExpression<T>* expr1)
+    : SGNaryExpression<T>(expr0, expr1)
+  { }
+  virtual void eval(T& value, const simgear::expression::Binding* b) const
+  {
+    value = getOperand(0)->getValue(b);
+    unsigned sz = SGNaryExpression<T>::getNumOperands();
+    for (unsigned i = 1; i < sz; ++i)
+      value -= getOperand(i)->getValue(b);
+  }
+  using SGNaryExpression<T>::getValue;
+  using SGNaryExpression<T>::getOperand;
+};
+
 template<typename T>
 class SGProductExpression : public SGNaryExpression<T> {
 public:
@@ -1234,7 +1248,7 @@ namespace simgear
     ConvertExpression() {}
     ConvertExpression(::SGExpression<OpType>* expr0)
     {
-      addOperand(expr0);
+      this->addOperand(expr0);
     }
     virtual void eval(T& value, const simgear::expression::Binding* b) const
     {