private void _backward()
{
List <object> deletedList = new List <object>();
try
{
int lastIndex = MyBoardObjects.Count - 1;
object obj = MyBoardObjects[lastIndex];
if (obj is MySketch)
{
MySketch tempSketch = obj as MySketch;
int no_lines = tempSketch.pointsSet.Count - 1;
///<summary>To removet the no_lines number of lines</summary>
MyBoard.Children.RemoveRange(MyBoard.Children.Count - no_lines, no_lines - 1);
deletedList.Add(MyBoardObjects[lastIndex]);
MyBoardObjects.RemoveAt(lastIndex);
}
else
{
deletedList.Add(MyBoardObjects[lastIndex]);
MyBoardObjects.RemoveAt(lastIndex);
MyBoard.Children.RemoveAt(MyBoard.Children.Count - 1);
}
deletedObjects.Push(deletedList);
}
catch (Exception) { }
}
/// <summary>
/// Remove the substroke and delete the parent shape if it is empty.
/// </summary>
protected override void performActual()
{
_shape.RemoveSubstroke(_substroke);
if (_shape.IsEmpty)
{
MySketch.RemoveShape(_shape);
}
}
private void _forward()
{
List <object> lastObj;
if (deletedObjects.Count == 0)
{
return;
}
lastObj = deletedObjects.Pop();
foreach (object obj in lastObj)
{
if (obj is MySketch)
{
MySketch mySketch = obj as MySketch;
PointCollection points = mySketch.pointsSet;
try
{
addLines(points);
MyBoardObjects.Add(mySketch);
}
catch (Exception) { }
}
else if (obj is MyRectangle)
{
MyRectangle myrect = obj as MyRectangle;
try
{
MyBoard.Children.Add(myrect.rect);
MyBoardObjects.Add(myrect);
}
catch (Exception) { }
}
else if (obj is MyLine)
{
MyLine myline = obj as MyLine;
try
{
MyBoard.Children.Add(myline._line);
MyBoardObjects.Add(myline);
}
catch (Exception) { }
}
else if (obj is MyEllipse)
{
MyEllipse myelli = obj as MyEllipse;
try
{
MyBoard.Children.Add(myelli.ellipse);
MyBoardObjects.Add(myelli);
}
catch (Exception) { }
}
else
{
}
}
}
private object getSketch(object sender, MouseButtonEventArgs e)
{
PointCollection pointsColl = new PointCollection()
{
_start
};
MySketch mysketch = new MySketch(pointsColl);
MyBoardObjects.Add(mysketch);
return(pointsColl);
}
/// <summary>
/// Make the substroke trade.
/// </summary>
protected override void performActual()
{
foreach (EndPoint endpoint in _gem.Endpoints)
{
endpoint.ConnectedShape = null;
}
Shape victim = _gem.ParentShape;
if (victim != null)
{
victim.RemoveSubstroke(_gem);
}
_thief.AddSubstroke(_gem);
if (victim != null && victim.Substrokes.Length == 0)
{
MySketch.RemoveShape(victim);
}
MySketch.CheckConsistency();
}
/// <summary>
/// Connects the shapes and the endpoint's connected shape.
/// </summary>
protected override void performActual()
{
MySketch.connectShapes(_endpoint.ParentShape, _toConnect);
_endpoint.ConnectedShape = _toConnect;
}
