exTileMapEditor.UpdateSelectRect C# (CSharp) Method

    void UpdateSelectRect()
    {
        float x = 0;
        float y = 0;
        float width = 0;
        float height = 0;
        Vector2 curMousePos = Event.current.mousePosition;

        if ( mouseDownPos.x < curMousePos.x ) {
            x = mouseDownPos.x;
            width = curMousePos.x - mouseDownPos.x;
        }
        else {
            x = curMousePos.x;
            width = mouseDownPos.x - curMousePos.x;
        }
        if ( mouseDownPos.y < curMousePos.y ) {
            y = mouseDownPos.y;
            height = curMousePos.y - mouseDownPos.y;
        }
        else {
            y = curMousePos.y;
            height = mouseDownPos.y - curMousePos.y;
        }

        sheetSelectRect = new Rect( x, y, width, height );
    }