옷 Driver Push Button to Print Parking Permit <> Raise Gate <> Lower Gate <> Barcode Reader Scans ticket, Fee is calculated <> Pay Fee <> <> Enter Command to Raise Gate 옷 Operator
Using the attached use case diagram, and the following scenario description, create a statement diagram for the system described.
Assignment: Parking Deck Problem
A parking deck system manages an entry/exit gate, which opens to let a vehicle (i.e., car) into or out of the deck and closes when the car has passed through. A driver must push a button to print a parking permit. When the driver takes the parking permit, the system raises the gate. The system lowers the gate after the vehicle has passed through. A permit id and time of entry is printed on the parking permit, and is also encoded on the permit’s bar code. When the vehicle leaves the parking deck, the driver inserts the parking permit into a bar code reader, which scans the bar code, and then transmits the bar code to the parking system. The parking system calculates a fee that is based on the number of hours that have elapsed since the vehicle entered the parking deck, and displays the fee to the operator and driver. The driver must pay the operator with cash or check. The operator accepts the payment, and if necessary returns change to the driver. Then, the operator enters a command to raise the gate to allow the vehicle to leave the parking deck.
You may assume that the system has the following external devices at the entry gate: a sensor to detect the presence of a car, a parking ticket printer to print the parking permit, an actuator to open and close the gate, and a sensor to detect that the car has departed. You may assume that the system has the following external devices at the exit gate: a bar code scanner to read the permit bar code id, a display to show the parking fee to the operator and driver, an actuator to open and close the gate, and a sensor to detect that the car has departed.
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