The box function in Ue4

1 voidAhud::getactorsinselectionrectangle (tsubclassof<classAactor> Classfilter,Constfvector2d& Firstpoint,Constfvector2d& Secondpoint, tarray<aactor*>& outactors,BOOLBincludenoncollidingcomponents,BOOLbactormustbefullyenclosed)2 {3     //Because This is a HUD function it's likely to get called each tick,4     //So make sure any previous contents of the An Out actor array has been cleared!5 outactors.empty ();6 7     //Create Selection Rectangle from Points8Fbox2d Selectionrectangle (0);9 Ten     //This method ensures a appropriate rectangle is generated, One     //no matter what is the coordinates of first and second point actually is. ASelectionrectangle + =Firstpoint; -Selectionrectangle + =Secondpoint; -  the  -     //The Actor Bounds point Mapping -     ConstFvector boundspointmapping[8] = -     { +Fvector (1,1,1), -Fvector (1,1, -1), +Fvector (1, -1,1), AFvector (1, -1, -1), atFvector (-1,1,1), -Fvector (-1,1, -1), -Fvector (-1, -1,1), -Fvector (-1, -1, -1) -     }; -  in     //~~~ -  to     //For each Actor of the Class Filter Type +      for(Tactoriterator<aactor> Itr (Getworld (), classfilter); ITR; ++Itr) -     { theaactor* eachactor = *Itr; *  $         //Get Actor Bounds//casting to base class, checked by template in the. hPanax Notoginseng         ConstFbox eachactorbounds = cast<aactor> (eachactor)->getcomponentsboundingbox (bIncludeNonCollidingComponents) ;/*All components ?*/ -  the         //Center +         ConstFvector Boxcenter =Eachactorbounds.getcenter (); A  the         //extents +         ConstFvector boxextents =eachactorbounds.getextent (); -  $         //Build 2D bounding box of actor in screen space $Fbox2d actorbox2d (0); -          for(Uint8 Boundspointitr =0; Boundspointitr <8; boundspointitr++) -         { the             //Project vert into screen space. -             ConstFvector projectedworldlocation = Project (Boxcenter + (BOUNDSPOINTMAPPING[BOUNDSPOINTITR] *boxextents));Wuyi             //Add to 2D bounding box theactorbox2d + =fvector2d (projectedworldlocation.x, PROJECTEDWORLDLOCATION.Y); -         } Wu  -         //Selection Box must fully enclose the projected Actor Bounds About         if(bactormustbefullyenclosed) $         { -             if(Selectionrectangle.isinside (actorbox2d)) -             { -Outactors.add (cast<aactor>(Eachactor)); A             } +         } the         //Partial intersection with projected Actor Bounds -         Else $         { the             if(Selectionrectangle.intersect (actorbox2d)) the             { theOutactors.add (cast<aactor>(Eachactor)); the             } -         } in     } the}

The box function in Ue4