MeleeTargeting.c

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class MeleeTargetData
{   
    Object Obj;
    vector HitPos;
    int HitComponent;
    
    void MeleeTargetData(Object o, vector p, int c)
    {
        Obj = o;
        HitPos = p;
        HitComponent = c;
    }
}
 
class MeleeTargetSettings
{
    vector ConeOrigin;
    float ConeLength;
    float ConeHalfAngle;
    float ConeHalfAngleRad;
    float ConeMinHeight;
    float ConeMaxHeight;
    
    vector ConeLeftPoint;
    vector ConeRightPoint;
    
    vector RayStart;
    vector RayEnd;
    vector Dir;
    vector XZDir;
    float MaxDist;
    
    EntityAI Attacker;
    ref array<typename> TargetableObjects
    
    void MeleeTargetSettings(vector coneOrigin, float coneLength, float coneHalfAngle, float coneMinHeight, float coneMaxHeight, vector rayStart, vector dir, float maxDist, EntityAI pToIgnore, array<typename> targetableObjects)
    {
        ConeOrigin          = coneOrigin;
        ConeLength          = coneLength;
        ConeHalfAngle       = coneHalfAngle;
        ConeHalfAngleRad    = Math.DEG2RAD * coneHalfAngle;
        ConeMinHeight       = coneMinHeight;
        ConeMaxHeight       = coneMaxHeight;
        
        RayStart            = rayStart;
        RayEnd              = rayStart + Math.SqrFloat(coneLength) * dir;
        
        Dir                 = dir; 
        
        XZDir               = dir;
        XZDir[1]            = 0;
        XZDir.Normalize();
        
        MaxDist             = maxDist;
        
        Attacker            = pToIgnore;
        TargetableObjects   = targetableObjects;
        
        // Calculate cone points
        Math3D.ConePoints(ConeOrigin, ConeLength, ConeHalfAngleRad, -Math.Atan2(XZDir[0], XZDir[2]), ConeLeftPoint, ConeRightPoint);
    }
}
 
class ComponentResult
{
    vector ComponentPos;
    float ComponentAngle;
    float ComponentDistance2;
    int ComponentIdx;
}
 
class MeleeTargeting
{
    const static PhxInteractionLayers MELEE_TARGET_OBSTRUCTION_LAYERS = PhxInteractionLayers.BUILDING|PhxInteractionLayers.DOOR|PhxInteractionLayers.VEHICLE|PhxInteractionLayers.ROADWAY|PhxInteractionLayers.TERRAIN|PhxInteractionLayers.ITEM_SMALL|PhxInteractionLayers.ITEM_LARGE|PhxInteractionLayers.FENCE;
    
    MeleeTargetData GetMeleeTargetEx(MeleeTargetSettings settings, out array<Object> allTargets = null, array<string> blacklistedDamageZones = null)
    {
        MeleeTargetData ret;
        
        // Easier access to MeleeTargetSettings variables
        vector  coneOrigin                  = settings.ConeOrigin;
        float   coneLength                  = settings.ConeLength;
        float   coneHalfAngle               = settings.ConeHalfAngle;
        float   radAngle                    = settings.ConeHalfAngleRad;
        float   coneMinHeight               = settings.ConeMinHeight;
        float   coneMaxHeight               = settings.ConeMaxHeight;
        
        vector coneLeft                     = settings.ConeLeftPoint;
        vector coneRight                    = settings.ConeRightPoint;
        
        vector rayStart                     = settings.RayStart;
        vector rayEnd                       = settings.RayEnd;
        vector dir                          = settings.Dir;
        vector xzDir                        = settings.XZDir;
        float maxDist                       = settings.MaxDist;
        
        EntityAI pToIgnore                  = settings.Attacker;
        array<typename> targetableObjects   = settings.TargetableObjects;
        
        // Calculate box size
        float boxWidth = vector.Distance(coneLeft, coneRight);      
        float boxHeight = coneMaxHeight - coneMinHeight;
        
        vector boxSize = Vector(boxWidth, boxHeight, coneLength);
        
        // Calculate box center
        vector centerHeight = Vector(0, Math.Lerp(coneMinHeight, coneMaxHeight, 0.5), 0);
        vector offset = xzDir * coneLength * 0.5;
        vector boxCenter = coneOrigin + offset + centerHeight;
        
        // Gather all targets
        BoxCollidingParams params = new BoxCollidingParams();
        params.SetParams(boxCenter, xzDir.VectorToAngles(), boxSize, ObjIntersect.Fire, ObjIntersect.Fire, true);
        array<ref BoxCollidingResult> results = new array<ref BoxCollidingResult>;
        array<Object> toIgnore = { pToIgnore };
        if (GetGame().IsBoxCollidingGeometryProxy(params, toIgnore, results))
        {
            //
            float   retVal  = float.MAX;
            float   tgAngle = Math.Tan(radAngle);   
        
            #ifdef DIAG_DEVELOPER
            if (DiagMenu.GetBool(DiagMenuIDs.MELEE_DRAW_RANGE) && DiagMenu.GetBool(DiagMenuIDs.MELEE_DEBUG))
                Debug.DrawLine(rayStart, rayEnd, COLOR_GREEN, ShapeFlags.ONCE);
            #endif
            
            // Find the most suitable target
            foreach (BoxCollidingResult bResult : results)
            {
                Object obj = bResult.obj;
                
                // Check for targetable objects
                if (!obj.IsAnyInherited(targetableObjects) || !obj.IsAlive())
                {
                    continue;
                }
                
                // Ready the defaults for the object
                vector targetPos = obj.GetPosition();                           
                float targetAngle = Math.RAD2DEG * Math.AbsFloat(Math3D.AngleFromPosition(coneOrigin, dir, targetPos)); 
                float targetDistance2 = vector.DistanceSq(targetPos, Math3D.NearestPoint(rayStart, rayEnd, targetPos)); 
                int hitComponent = -1;
 
                float csSum = float.MAX;
                
                // Find the most suitable component
                ComponentResult result;
                if (FindMostSuitableComponentEx(obj, bResult, settings, csSum, result, blacklistedDamageZones))
                {
                    targetPos       = result.ComponentPos;
                    targetAngle     = result.ComponentAngle;
                    targetDistance2 = result.ComponentDistance2;
                    hitComponent    = result.ComponentIdx;
                }
 
                // ProxyInfo
                if (bResult.proxyInfo)
                {
                    foreach (BoxCollidingResult pInfo : bResult.proxyInfo)
                    {
                        if (FindMostSuitableComponentEx(obj, pInfo, settings, csSum, result, blacklistedDamageZones))
                        {
                            targetPos       = result.ComponentPos;                          
                            targetAngle     = result.ComponentAngle;    
                            targetDistance2 = result.ComponentDistance2;    
                            hitComponent    = result.ComponentIdx;
                        }
                    }
                }
                
                // No suitable component found
                if (hitComponent == -1 || csSum == float.MAX)
                {
                    continue;
                }
 
                // Check if it is a better fit than what has been found previously
                float sum  = targetDistance2;
                if (sum < retVal)
                {
                    ret     = new MeleeTargetData(obj, targetPos, hitComponent);
                    retVal  = sum;
                }
    
                allTargets.Insert(obj);
            }
        }
        
        return ret;
    }
    
    MeleeTargetData GetMeleeTarget(MeleeTargetSettings settings, out array<Object> allTargets = null)
    {
        return GetMeleeTargetEx(settings, allTargets);
    }
    
 
    bool FindMostSuitableComponentEx(Object obj, BoxCollidingResult bResult, MeleeTargetSettings settings, out float sum, out ref ComponentResult result, array<string> blacklistedDamageZones)
    {
        foreach (ComponentInfo cInfo : bResult.componentInfo)
        {
            ComponentResult cResult = new ComponentResult;
            
            if (!EvaluateComponentEx(obj, cInfo, settings, cResult, blacklistedDamageZones))
            {
                continue;
            }
            
            // Smallest number is a winner
            float cSum = cResult.ComponentDistance2;
            if (cSum < sum)
            {
                sum = cSum;             
                result = cResult;               
            }
        }
        
        return result != null;
    }
 
    bool FindMostSuitableComponent(Object obj, BoxCollidingResult bResult, MeleeTargetSettings settings, out float sum, out ref ComponentResult result)
    {
        return FindMostSuitableComponentEx(obj, bResult, settings, sum, result, null);
    }
    
    bool EvaluateComponentEx(Object obj, ComponentInfo cInfo, MeleeTargetSettings settings, out ref ComponentResult result, array<string> blacklistedDamageZones)
    {
        foreach (string zoneName: blacklistedDamageZones)
        {
            if (obj.GetDamageZoneNameByComponentIndex(cInfo.component) == zoneName)
            {
                return false;
            }
        }
 
        vector componentPos = cInfo.componentCenter;
        
        // Too far away! (fast reject)
        float componentMaxDist2 = Math.SqrFloat(settings.MaxDist + cInfo.componentRadius * obj.GetScale());
        vector nearestPoint = Math3D.NearestPoint(settings.RayStart, settings.RayEnd, componentPos);
        float componentDistance2 = vector.DistanceSq(componentPos, nearestPoint);
        if (componentDistance2 > componentMaxDist2)
        {
            return false;
        }
        
        // Here some more accurate check could be placed that would adjust the componentPos
        
        // Outside of the cone angle!
        float componentAngle = Math.RAD2DEG * Math.AbsFloat(Math3D.AngleFromPosition(settings.ConeOrigin, settings.XZDir, componentPos));   
        if (componentAngle > settings.ConeHalfAngle)
        {
            return false;
        }
            
        // Obstructed!
        if (IsMeleeTargetObstructed(settings.RayStart, componentPos))
        {
            return false;
        }
 
        // We found something, fill it in!
        result.ComponentPos = componentPos;
        result.ComponentAngle = componentAngle;
        result.ComponentDistance2 = componentDistance2;
        result.ComponentIdx = cInfo.component;
        
        return true;
    }
    
    bool EvaluateComponent(Object obj, ComponentInfo cInfo, MeleeTargetSettings settings, out ref ComponentResult result)
    {
        return EvaluateComponentEx(obj, cInfo, settings, result, {});
    }
    
    bool IsMeleeTargetObstructed(vector rayStart, vector rayEnd)
    {
        if (rayStart == rayEnd)
        {
            return true; // Not possible to trace when this happens (zero length raycast)
        }
        
        Object hitObject;
        vector hitPos, hitNormal;
        float hitFraction;
 
        return DayZPhysics.RayCastBullet( rayStart, rayEnd, MELEE_TARGET_OBSTRUCTION_LAYERS, null, hitObject, hitPos, hitNormal, hitFraction);
    }
}