ChildObjects.cs

Siirry tämän tiedoston dokumentaatioon.

#region MIT License
/*
 * Copyright (c) 2009 University of Jyväskylä, Department of Mathematical
 * Information Technology.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#endregion

/*
 * Authors: Tero Jäntti, Tomi Karppinen, Janne Nikkanen.
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Jypeli
{
    public partial class GameObject : GameObjectContainer
    {
        internal SynchronousList<GameObject> _childObjects = null;
        internal protected bool autoResizeChildObjects = true;

        public SynchronousList<GameObject> Objects
        {
            get { InitChildren(); return _childObjects; }
        }

        public int ObjectCount
        {
            get { return _childObjects == null ? 0 : _childObjects.Count; }
        }

        public void Add( IGameObject childObject )
        {
            if (!(childObject is GameObject))
                throw new ArgumentException( "Non-GameObjects as child objects are not supported." );

            if (childObject is Jypeli.Assets.Explosion)
                throw new ArgumentException("Explosion as child object is not supported. Use Game.Add(explosion) instead.");

            Objects.Add((GameObject)childObject);
        }

        public void Remove( IGameObject childObject )
        {
            if ( !( childObject is GameObject ) )
                throw new ArgumentException( "Non-GameObjects as child objects are not supported." );

            Objects.Remove((GameObject)childObject);
        }

        protected virtual void InitChildren()
        {
            if ( _childObjects != null ) return;
            _childObjects = new SynchronousList<GameObject>();
            _childObjects.ItemAdded += Game.OnAddObject;
            _childObjects.ItemRemoved += Game.OnRemoveObject;
            _childObjects.ItemAdded += this.OnChildAdded;
            _childObjects.ItemRemoved += this.OnChildRemoved;
            _childObjects.Changed += this.NotifyParentAboutChangedSizingAttributes;

            // Objects list needs updating
            IsUpdated = true;
        }

        private void OnChildAdded( GameObject child )
        {
            child.Parent = this;
            this.AddedToGame += child.OnAddedToGame;
            this.Removed += child.OnRemoved;
        }

        private void OnChildRemoved( GameObject child )
        {
            // This 'if' ensures that nothing is broken if a child is transferred
            // to another parent first and removed afterwards
            if ( child.Parent == this )
                child.Parent = null;

            this.AddedToGame -= child.OnAddedToGame;
            this.Removed -= child.OnRemoved;
        }

        private void DestroyChildren()
        {
            if ( _childObjects == null ) return;

            foreach ( GameObject child in _childObjects )
            {
                child.Destroy();
            }
        }

        private void UpdateChildren( Time time )
        {
            if ( _childObjects == null )
                return;

            Objects.Update( time );
        }

        private void UpdateChildSizes( Vector oldSize, Vector newSize )
        {
            if ( _childObjects == null ) return;

            double xFactor = newSize.X / oldSize.X;
            double yFactor = newSize.Y / oldSize.Y;

            foreach ( var o in _childObjects )
            {
                Vector oldChildSize = o.Size;
                o.Size = new Vector( oldChildSize.X * xFactor, oldChildSize.Y * yFactor );

                //                    Vector direction = o.Position.Normalize();
                //                    double distance = o.Position.Magnitude;
                Vector oldChildPosition = o.Position;
                o.Position = new Vector( oldChildPosition.X * xFactor, oldChildPosition.Y * yFactor );
            }
        }

        private bool IsInsideChildren( Vector point )
        {
            if ( _childObjects == null ) return false;

            for ( int i = 0; i < _childObjects.Count; i++ )
            {
                if ( _childObjects[i].IsInside( point ) ) return true;
            }

            return false;
        }

        public virtual void Clear()
        {
            _childObjects.Clear();
        }
    }
}