` Undo Violet Group

CS 151 - Undo Violet

Craig Huff, Qi Liu, Yuliang Pan, Hengyi Shi

Cover page image

Git Repo

Project Design


    
    
  • Command Style
    • 
    
    
    public interface ICommand{
    boolean Execute();
    void UndoExecute();} 
    
   
      
  • CommandManager
    • 
      
  • AddCommand 
    • 
      
  • DeleteCommand
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    Project Implementation
    
     
    
     
    
     
    
    This is the basis for the Add and Delete Commands. 
    
     // @Override
    public boolean Execute()
    {
        if (isNode)
        {
            graph.add(node, point);

        }
        else if (!isNode)
        {
            graph.connect(edge, mouseDownPoint, point);
        }

        return true;
    }

    // @Override
    public void UndoExecute()
    {
        if (isNode)
        {
            graph.removeNode(node);
        }
        else if (!isNode)
        {
            graph.removeEdge(edge);
        }

    }
    
      This is CommandManager Class. 
    
      private Stack commandUndoStack = new Stack();
    private Stack commandRedoStack = new Stack();

    public void ExecuteCommand(ICommand cmd)
    {
        cmd.Execute();
        commandUndoStack.push(cmd);
    }

    public void Undo()
    {
        if (!commandUndoStack.empty())
        {       
            ICommand cmd = commandUndoStack.pop();
            cmd.UndoExecute();
            commandRedoStack.push(cmd);
              
        }
    }

    public void Redo()
    {
        if (!commandRedoStack.empty())
        {
            ICommand cmd = commandRedoStack.pop();
            cmd.Execute();
            commandUndoStack.push(cmd);
        }
    }
    
    
    
    Collaboration
    
    
    
    
    
    
    
    
  • Facebook Messenger
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  • Git Issues
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  • Room for improvement
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