o1.city
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homesPerSide: Int, populations: Vector[(Demographic, Int)]) extends Grid[Demographic]
A CityMap is a square grid that represents a simplified map of a city. It is a Grid whose elements are Demographic objects. That is, each GridPos (“street address”) on a CityMap is either Vacant or stores a household that belongs to aparticular demographic.
A CityMap is a square grid that represents a simplified map of a city. It is a Grid whose elements are Demographic objects. That is, each GridPos (“street address”) on a CityMap is either Vacant or stores a household that belongs to aparticular demographic.
A CityMap is mutable. As a household moves, the corresponding Demographic object moves to a different GridPos on the CityMap.
Parameters
- homesPerSide
-
the number of street addresses in each row and each column of the city grid (which is always square)
- populations
-
a vector of pairs in which each
Demographicis matched with a count of how many times it appears on this city map
Attributes
- Supertypes
A Demographic indicates which demographic (“slice of the overall population”) a particular household belongs to (if any). It is used by the simulator to mark households on a city map.
A Demographic indicates which demographic (“slice of the overall population”) a particular household belongs to (if any). It is used by the simulator to mark households on a city map.
There are two kinds of Demographic objects: Vacant and Occupied:
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The singleton object Vacant is used for indicating that a residence is empty and does not belong to any demographic.
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Occupied objects indicate that a residence belongs to a specific demographic; each different demographic is assigned a different
Color. For instance, a residence may be “occupied by the red demographic”, or “occupied by the blue demographic”.
What exactly constitutes a demographic is unimportant for the purposes of this class. Demographics could be based on people’s socioeconomic status, political views, ethnicity, age, or something else.
All Demographic objects are immutable.
The trait Demographic itself does not define any methods; it merely serves as a supertype for Occupied and Vacant.
Attributes
- Supertypes
- Known subtypes
label: Color) extends Demographic
An Occupied object signals that a household belongs to a demographic specific by the color label stored within the Occupied object. For instance, a residence may be “occupied by the red demographic”, or “occupied by the blue demographic”.
An Occupied object signals that a household belongs to a demographic specific by the color label stored within the Occupied object. For instance, a residence may be “occupied by the red demographic”, or “occupied by the blue demographic”.
An Occupied object is immutable
Parameters
- label
-
a color that distinguishes the occupying demographic from others
Attributes
- Supertypes
A Simulator object is a city simulator based on Schelling’s model of emergent social segregation. Its key methods are startNew, which launches a new simulation, and moveResidents, which advances the most recently launched simulation by moving dissatisfied residents into vacant homes. A selection of other methods is also provided for examining the state of the simulation.
A Simulator object is a city simulator based on Schelling’s model of emergent social segregation. Its key methods are startNew, which launches a new simulation, and moveResidents, which advances the most recently launched simulation by moving dissatisfied residents into vacant homes. A selection of other methods is also provided for examining the state of the simulation.
As implied above, a Simulator is mutable: Calling startNew causes the simulator to discard any previously active simulation and start processing a new one. Calling moveResidents modifies the state of the active simulation.
Attributes
- Supertypes
This immutable singleton object effectively means “no demographic at all”. It can be used on a CityMap to indicate that a residence is empty.