|Lesson 8||Course project, part 2 |
|Objective||Write classes for traffic signals |
Course Project - Traffic Signals
Write the classes for the traffic signals in the course project. As the first part of the course project, let us create the traffic lights and Walk/Don't Walk signs.
Here are some of the specifications for the project:
- Traffic lights have an intermediate yellow state, and always pass through their three possible states in the cyclic order red/green/yellow/red.
- Walk/Don't Walk signs have an intermediate flashing don't walk state, and always pass through their three possible states in the cyclic order walk/flashing don't walk/don't walk/walk.
- There should be a minimum time associated with each light state (for instance, you don't want pedestrians to have to race across the street in under 5 seconds). However, the traffic light probably should not have a maximum time on green.
Other states may need maximum times to allow the traffic light to revert to green (Remember, pedestrians have to push a button to get a walk sign. If no one pushes a button, the pedestrian signal remains locked in "Don't Walk").
- By default, the traffic light is green until a pedestrian pushes a button on the light indicating they wish to cross the street.
- Most importantly, the lights must be connected. It is important to insure that whenever the traffic light is green, the crosswalk sign reads,
Abstract Traffic Signal - Exercise