CODE:

//	クリッピングレイヤーオブジェクト
//	管理するレイアウトを指定範囲の描画にしたい場合に利用する
class LayerObject : public DrawObject {
private :
	int m_orgSizeWidth;
	int m_orgSizeHeight;
public :
	int getOrgSizeWidth(){
		return m_orgSizeWidth;
	}
	int getOrgSizeHeight(){
		return m_orgSizeHeight;
	}

	LayerObject() : DrawObject( LAYER_OBJECT ){
		posX = 0;
		posY = 0;
		sizeWidth = SCREEN_WIDTH;
		sizeHeight = SCREEN_HEIGHT;
	}
	void LayerSetting( float x , float y , float w , float h ){
		posX = x;
		posY = y;
		sizeWidth = (int)w;
		sizeHeight = (int)h;
		m_orgSizeWidth = sizeWidth;
		m_orgSizeHeight = sizeHeight;
	}
	virtual void OnUpdate(){
		for( std::list::iterator iter = m_childObject.begin() ; iter != m_childObject.end() ; iter++ ){
			(*iter)->OnUpdate();
		}
	}
	virtual void OnDraw(){
		float x = getPosAnchorX();
		float y = getPosAnchorY();
		float ParentPosX = 0;
		float ParentPosY = 0;

		//	親が存在する場合、親の座標を計算する
		DrawObject* draw = GameObject::TypeAs( getParent() );
		if( draw ){
			ParentPosX = draw->getParentPosX();
			ParentPosY = draw->getParentPosY();
		}
		int x1 = (int)(ParentPosX+x);
		int y1 = (int)(ParentPosY+y);
		int x2 = x1+sizeWidth;
		int y2 = y1+sizeHeight;
		SetDrawArea( x1 , y1 , x2 , y2 );
		for( std::list::iterator iter = m_childObject.begin() ; iter != m_childObject.end() ; iter++ ){
			(*iter)->OnDraw();
			LayerObject* layer = GameObject::TypeAs( (*iter) );
			if( layer ){
				SetDrawArea( x1 , y1 , x2 , y2 );
			}
		}
		x1 = 0;
		y1 = 0;
		x2 = SCREEN_WIDTH;
		y2 = SCREEN_HEIGHT;
		SetDrawArea( x1 , y1 , x2 , y2 );
	}
};