Fixes #295

When cannon cannot turn at specified angle, it will still reach the edge angle, but return the error code

src/common/global.h

@@ -123,6 +123,7 @@ enum Error
     ERR_TOOMANY           = 702,      //! <  too many objects
     ERR_OBLIGATORYTOKEN   = 800,      //! <  compulsory instruction missing
     ERR_PROHIBITEDTOKEN   = 801,      //! <  instruction prohibited
+    ERR_AIM_IMPOSSIBLE    = 900,      //! <  cannot aim at specified angle(s)
 
     INFO_FIRST            = 10000,    //! <  first information
     INFO_BUILD            = 10001,    //! <  construction builded

src/object/task/taskgungoal.cpp

@@ -26,6 +26,7 @@
 
 CTaskGunGoal::CTaskGunGoal(CObject* object) : CTask(object)
 {
+    m_aimImpossible = false;
 }
 
 // Object's destructor.
@@ -116,6 +117,12 @@ Error CTaskGunGoal::Start(float dirV, float dirH)
 
     m_progress = 0.0f;
 
+    // direction was constrainted, hence resulting in impossible move
+    if (dirV != m_finalDirV || dirH != m_finalDirH)
+    {
+        m_aimImpossible = true;
+    }
+
     return ERR_OK;
 }
 
@@ -126,12 +133,25 @@ Error CTaskGunGoal::IsEnded()
     if ( m_engine->GetPause() )  return ERR_CONTINUE;
 
     if ( m_initialDirV == m_finalDirV &&
-         m_initialDirH == m_finalDirH )  return ERR_STOP;
-    if ( m_progress < 1.0f )  return ERR_CONTINUE;
+         m_initialDirH == m_finalDirH )
+    {
+        if ( m_aimImpossible )
+            return ERR_AIM_IMPOSSIBLE;
+        else
+            return ERR_STOP;
+    }
+
+    if ( m_progress < 1.0f ) return ERR_CONTINUE;
 
     m_object->SetGunGoalV(m_finalDirV);
     m_object->SetGunGoalH(m_finalDirH);
     Abort();
+
+    if ( m_aimImpossible )
+    {
+        return ERR_AIM_IMPOSSIBLE;
+    }
+
     return ERR_STOP;
 }
 

src/object/task/taskgungoal.h

@@ -44,5 +44,7 @@ protected:
     float       m_finalDirV;    // direction to reach
     float       m_initialDirH;  // initial direction
     float       m_finalDirH;    // direction to reach
+
+    bool        m_aimImpossible; // set to true if impossible aim was set
 };
 

src/script/script.cpp

@@ -1393,7 +1393,7 @@ bool CScript::Process(CScript* script, CBotVar* result, int &exception)
 
         if ( err == ERR_STOP )  err = ERR_OK;
         result->SetValInt(err);  // indicates the error or ok
-        if ( err != ERR_OK && script->m_errMode == ERM_STOP )
+        if ( ShouldExecutionStop(err, script->m_errMode) )
         {
             exception = err;
             return false;
@@ -1407,6 +1407,21 @@ bool CScript::Process(CScript* script, CBotVar* result, int &exception)
 }
 
 
+// Returns true if error code means rela error and exception must be thrown
+
+bool CScript::ShouldExecutionStop(Error err, int errMode)
+{
+    // aim impossible  - not a real error
+    if (err == ERR_AIM_IMPOSSIBLE)
+        return false;
+
+    if (err != ERR_OK && errMode == ERM_STOP)
+        return true;
+
+    return false;
+}
+
+
 // Compilation of the instruction "detect(type)".
 
 CBotTypResult CScript::cDetect(CBotVar* &var, void* user)
@@ -2954,7 +2969,11 @@ bool CScript::rAim(CBotVar* var, CBotVar* result, int& exception, void* user)
         var = var->GetNext();
         var == 0 ? y=0.0f : y=var->GetValFloat();
         err = script->m_primaryTask->StartTaskGunGoal(x*Math::PI/180.0f, y*Math::PI/180.0f);
-        if ( err != ERR_OK )
+        if (err == ERR_AIM_IMPOSSIBLE)
+        {
+            result->SetValInt(err);  // shows the error
+        }
+        else if ( err != ERR_OK )
         {
             delete script->m_primaryTask;
             script->m_primaryTask = 0;

src/script/script.h

@@ -24,6 +24,8 @@
 
 #include "common/event.h"
 
+#include "common/global.h"
+
 #include "app/pausemanager.h"
 
 #include "CBot/CBotDll.h"
@@ -209,6 +211,7 @@ public:
 
 private:
     static bool     Process(CScript* script, CBotVar* result, int &exception);
+    static bool     ShouldExecutionStop(Error err, int errMode);
     static CObject* SearchInfo(CScript* script, CObject* object, float power);
 
 protected: