class CP1BulletController : ZilchComponent
{
//This script is applied to the bullet (or other projectile) object.  Usually to the archetype as bullets are 
//spawned over time in the game. Ensure that you use the naming convention in the script for your game objects, 
//or change them to match your game objects.
    //Store a reference object for reccuring use
    var LevelObject : Cog = null;
    
    function Initialize(init : CogInitializer)
    {
        // Find the LevelSetting Object for the level the object is in
        this.LevelObject = this.Space.FindObjectByName("LevelSettings");
        //Connect to Logic Update to check screen boundaries
        Zero.Connect(this.Space, Events.LogicUpdate, this.OnLogicUpdate);
    }
    
    function OnLogicUpdate(updateEvent : UpdateEvent)
    {
        // If the bullet is off screen
        if(this.BoundaryChecks())
        {
            // Destroy the bullet
            Console.WriteLine("Destroy Bullet.");
            this.Owner.Destroy();
        }
    }
    
    // Checks if the object is not in the screen. Returns true if offscreen
    function BoundaryChecks() : Boolean
    {
        // Step 1: Determine the screen boundaries in world space
        
        // Find out Screen size from Camera Viewport
        var camViewport = this.LevelObject.CameraViewport;
        
        // Get the width and height of the screen at a depth of 0.0 since it's 2D:
        var screenHalfExtents = camViewport.ViewPlaneSize(0.0) * 0.5;
        var camPos = camViewport.Camera.Transform.Translation;
        
        // Knowing the camera is in the middle add or subtract half the
        // size from the camera's position to find the borders:
        var leftBoundary   = camPos.X - screenHalfExtents.X;
        var rightBoundary  = camPos.X + screenHalfExtents.X;
        var topBoundary    = camPos.Y + screenHalfExtents.Y;
        var bottomBoundary = camPos.Y - screenHalfExtents.Y;
        
        
        // Step 2: Check against the boundaries
        
        //  Make the boundary checks:
        var pos = this.Owner.Transform.Translation;
        // If too far left,
        if (pos.X < leftBoundary)
        {
            Console.WriteLine("Bullet off left screen edge.");
            return true;
        }
        // If too far right
        else if( pos.X > rightBoundary)
        {
            Console.WriteLine("Bullet off right screen edge.");
            return true;
        }
        
        // If too far up,
        if (pos.Y > topBoundary)
        {
            Console.WriteLine("Bullet off top screen edge.");
            return true;
        }
        // If too far down
        else if( pos.Y < bottomBoundary)
        {
            Console.WriteLine("Bullet off bottom screen edge.");
            return true;
        }
        
        return false;
    }
}