MegaMan.Editor.Bll.ScreenDocument.SetSelection C# (CSharp) Method

        public void SetSelection(int tx, int ty, int width, int height)
        {
            if (width != 0 && height != 0)
            {
                if (tx < 0)
                {
                    width += tx;
                    tx = 0;
                }
                if (ty < 0)
                {
                    height += ty;
                    ty = 0;
                }

                if (width + tx > Width) width = Width - tx;
                if (height + ty > Height) height = Height - ty;

                // all in tile sizes
                Selection = new Rectangle(tx, ty, width, height);
            }
            else
            {
                Selection = null;
            }

            if (SelectionChanged != null)
            {
                SelectionChanged(Selection);
            }

            ViewModelMediator.Current.GetEvent<SelectionChangedEventArgs>().Raise(this, new SelectionChangedEventArgs() { Screen = this, Selection = Selection });
        }