EZStrobe provides graphical and interactive model verification (debugging) by animating the graphical model representation within Visio. Using animation provides insight into how the model really works and increases our confidence that it is indeed correct. EZStrobe animation uses special graphical elements (such as counters) and attributes (such as color, line thickness, bold text, etc.) to represent the dynamic state of the simulation (e.g., the current content of queues and the number of ongoing activity instances) and the events that take place during simulation (e.g., when an instance of an activity starts or ends, when a queue receives resources, or when resources flow through links). ACD animation elements are described below.
Animation in EZStrobe is controlled through the EZStrobe Simulation Controller shown below. This controller appears only when an EZStrobe simulation is run, and then only if the Animate and enable breakpoints option is turned ON in the Model Options form.
The Begin button in the EZStrobe Simulation Controller starts the animation.
The visual speed of the animation depends on the position of the Animation Speed slider and can be decreased or increased while the animation is going on.
If checked, the Next event option pauses the animation at the next event. When the next event is reached, the simulation will pause immediately.
The Simulation Controller during a pause appears as follows:
Notice that the Begin button changes to Continue, and the current simulation time is displayed below the progress bar. The Continue button allows a paused animation to resume running.
While an animation is paused, or after it has ended, it is possible to right-click any activity or Queue in the ACD (the network) and inspect the current values of most associated statistics.
The displayed statistics should always be up to date. In some rare instances it may be necessary to force an update by clicking the Update Node Statistics button.
To watch a step-by-step animation of all simulation details,
To take "bigger" steps that encompass all the events that take place at a given simulation time,
To continue the animation and stop only after the simulation reaches a specified time,
This can be done whether the animation is ongoing or paused.
To make the simulation proceed without animation, and consequently at a much greater speed,
While a simulation runs with the Animate option OFF, it is possible to
Once the simulation is paused, it is possible to turn ON the Animate option, and (a) continue or (b) view the animation step-by-step as above.
To end the animation and the simulation at any time,
Changing any aspect of a model, such as editing the parameters of a Queue or Activity, while the simulation is running has no effect. Changes will be ignored until a new simulation run starts.
Note: If animation is of no interest, it is best to turn off the model option to Animate and Enable breakpoints prior to running the simulation, rather than to turn off the Animate option in the Simulation Controller. The simulation will run up to 10 times faster this way.
The visual elements of an EZStrobe animation are best explained by example using a small fragment of a paused ACD animation, such as the one below.