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scripting/includes/IsTargetInSightRange.inc

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+// File Name : IsTargetInSightRange.inc
+// File Version : 1.1
+// File Updated date : 03-07-2013
+
+/*
+ *Thanks to Javalia. he has helped to solve my question.
+ */
+
+stock bool:IsTargetInSightRange(client, target, Float:angle=90.0, Float:distance=0.0, bool:heightcheck=true, bool:negativeangle=false)
+{
+	if(angle > 360.0 || angle < 0.0)
+		ThrowError("Angle Max : 360 & Min : 0. %d isn't proper angle.", angle);
+	if(!isClientConnectedIngameAlive(client))
+		ThrowError("Client is not Alive.");
+	if(!isClientConnectedIngameAlive(target))
+		ThrowError("Target is not Alive.");
+		
+	decl Float:clientpos[3], Float:targetpos[3], Float:anglevector[3], Float:targetvector[3], Float:resultangle, Float:resultdistance;
+	
+	GetClientEyeAngles(client, anglevector);
+	anglevector[0] = anglevector[2] = 0.0;
+	GetAngleVectors(anglevector, anglevector, NULL_VECTOR, NULL_VECTOR);
+	NormalizeVector(anglevector, anglevector);
+	if(negativeangle)
+		NegateVector(anglevector);
+
+	GetClientAbsOrigin(client, clientpos);
+	GetClientAbsOrigin(target, targetpos);
+	if(heightcheck && distance > 0)
+		resultdistance = GetVectorDistance(clientpos, targetpos);
+	clientpos[2] = targetpos[2] = 0.0;
+	MakeVectorFromPoints(clientpos, targetpos, targetvector);
+	NormalizeVector(targetvector, targetvector);
+	
+	resultangle = RadToDeg(ArcCosine(GetVectorDotProduct(targetvector, anglevector)));
+	
+	if(resultangle <= angle/2)	
+	{
+		if(distance > 0)
+		{
+			if(!heightcheck)
+				resultdistance = GetVectorDistance(clientpos, targetpos);
+			if(distance >= resultdistance)
+				return true;
+			else
+				return false;
+		}
+		else
+			return true;
+	}
+	else
+		return false;
+}