Visualization Window

The visualization window is used in the unit production removal and the useless production removal. In both cases, it is used to model the dependencies of variables. In the unit production removal, it is used only to model the dependencies of the unit production variables. In the useless production removal, it is used to model the dependencies of all productions. Below is a picture of the visualization window.

With the visualization window, several operations can be performed on the states:

• Adding Transitions - The user must add the transitions from one state, or variable, to the other. This is done by clicking and dragging from the FROM state to the TO state with LEFT MOUSE BUTTON. If the transition has the same FROM state as the TO state, then press and release the left mouse button over the same state. You will be prompted when you have displayed all of the transitions for the given grammar.
• Moving States - The states are originally displayed in a circular fashion. It may be difficult to see the flow of transitions from one state to another. Therefore, you can move the states into any arrangement you want by simply dragging the state from one position of the screen to another using the MIDDLE MOUSE BUTTON. Just hold the mouse button down on the state you want to move, move the mouse to where you want it, and release the mouse button.
• Adding Final States - Final States are only available in the useless production removal. You can add a final state to the states by clicking the state with the RIGHT MOUSE BUTTON.

NOTE: The middle mouse button can be simulated by pressing SHIFT or ALT when pressing the left mouse button. The right mouse button can be simulated by pressing CTRL when pressing the left mouse button.