138 rivejä
3.2 KiB
Java
138 rivejä
3.2 KiB
Java
package de.hems.trafficsim;
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import java.util.Random;
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/**
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* Model class which represents a vehicle in the simulation.
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*/
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public class Vehicle {
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/**
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* a number to index the vehicle
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*/
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final protected int id;
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/**
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* current position of the vehicle on the track
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*/
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protected float position;
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/**
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* current velocity of the vehicle
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*/
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protected float curVelocity;
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/**
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* maximum velocity of the vehicle
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*/
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protected float maxVelocity;
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/**
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* probability of the vehicle to brake without reason
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*/
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protected float brakeProb;
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/**
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* length of the track the vehicle is placed on
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*/
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final protected float trackLength;
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/**
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* Constructs a new vehicle.
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*
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* @param id a number to index the vehicle
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* @param position current position of the vehicle on the track
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* @param maxVelocity maximum velocity of the vehicle
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* @param brakeProb probability of the vehicle to brake without reason
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* @param trackLength length of the track the vehicle is placed on
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*/
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public Vehicle(int id, int position, float maxVelocity, float brakeProb, float trackLength) {
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this.id = id;
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this.position = position;
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this.maxVelocity = maxVelocity;
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this.brakeProb = brakeProb;
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this.curVelocity = 0;
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this.trackLength = trackLength;
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}
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/**
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* Getter for position
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*
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* @return position
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*/
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public float getPosition() {
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return position;
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}
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/**
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* Getter for curVelocity
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*
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* @return curVelocity
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*/
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public float getCurVelocity() {
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return curVelocity;
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}
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/**
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* Getter for maxVelocity
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*
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* @return maxVelocity
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*/
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public float getMaxVelocity() {
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return maxVelocity;
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}
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/**
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* Setter for maxVelocity
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*
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* @return maxVelocity
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*/
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public void setMaxVelocity(float maxVelocity) {
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this.maxVelocity = maxVelocity;
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}
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/**
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* Setter for brakeProb
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*
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* @return brakeProb
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*/
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public void setBrakeProb(float brakeProb) {
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this.brakeProb = brakeProb;
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}
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/**
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* Calculates the new velocity of the vehicle based on the following rules:
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* <ol>
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* <li>Increase by one if the vehicle is slower than it's maximum speed</li>
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* <li>Random brake by one</li>
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* <li>Break if the distance to the forerunner is less than it's speed</li>
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* </ol>
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*
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* @param distanceForerunner distance to the forerunner of the vehicle
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*/
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public void updateVelocity(float distanceForerunner) {
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Random random = new Random();
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float r = random.nextFloat();
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if (curVelocity < maxVelocity) {
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curVelocity = curVelocity + 1;
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}
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if (r < brakeProb && curVelocity > 0) {
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curVelocity = curVelocity - 1;
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}
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if (curVelocity > distanceForerunner) {
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curVelocity = distanceForerunner;
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}
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}
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/**
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* Updates the position of the vehicle according to it's previously calculated speed.
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*/
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public void timeElapse() {
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position = (position + curVelocity) % this.trackLength;
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}
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}
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