1 package org.opentrafficsim.road.gtu.following;
2
3
4 /**
5 * Fixed GTU following model. This GTU following model does not react in any way to other GTUs. Instead it has a predetermined
6 * acceleration for a predetermined duration.<br>
7 * Primary use is testing of lane based GTU movement.
8 * <p>
9 * Copyright (c) 2013-2015 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
10 * BSD-style license. See <a href="http://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
11 * <p>
12 * @version $Revision: 1378 $, $LastChangedDate: 2015-09-03 13:38:01 +0200 (Thu, 03 Sep 2015) $, by $Author: averbraeck $,
13 * initial version 6 feb. 2015 <br>
14 * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
15 * @author <a href="http://www.tudelft.nl/pknoppers">Peter Knoppers</a>
16 */
17 public class FixedAccelerationModel extends AbstractGTUFollowingModel
18 {
19 /** Acceleration that will be returned in GTUFollowingModelResult by computeAcceleration. */
20 private Acceleration.Abs acceleration;
21
22 /** Valid until time that will be returned in GTUFollowingModelResult by computeAcceleration. */
23 private Time.Rel duration;
24
25 /**
26 * Create a new FixedAccelerationModel.
27 * @param acceleration DoubleScalar.Abs<AccelerationUnit>; the acceleration that will be returned by the
28 * computeAcceleration methods
29 * @param duration DoubleScalar.Abs<TimeUnit>; the duration that the acceleration will be maintained
30 */
31 public FixedAccelerationModel(final Acceleration.Abs acceleration, final Time.Rel duration)
32 {
33 this.acceleration = acceleration;
34 this.duration = duration;
35 }
36
37 /**
38 * Retrieve the duration of this FixedAccelerationModel.
39 * @return DoubleScalar.Rel<TimeUnit>; the duration of this FixedAccelerationModel
40 */
41 public final Time.Rel getDuration()
42 {
43 return this.duration;
44 }
45
46 /**
47 * Retrieve the acceleration of this FixedAccelerationModel.
48 * @return DoubleScalar.Abs<AccelerationUnit>; the acceleration of this FixedAccelerationModel
49 */
50 public final Acceleration.Abs getAcceleration()
51 {
52 return this.acceleration;
53 }
54
55 /** {@inheritDoc} */
56 @Override
57 public final Acceleration.Abs computeAcceleration(final Speed.Abs followerSpeed, final Speed.Abs followerMaximumSpeed,
58 final Speed.Abs leaderSpeed, final Length.Rel headway, final Speed.Abs speedLimit)
59 {
60 return this.acceleration;
61 }
62
63 /** {@inheritDoc} */
64 @Override
65 public final Acceleration.Abs maximumSafeDeceleration()
66 {
67 return new Acceleration.Abs(2, METER_PER_SECOND_2);
68 }
69
70 /** {@inheritDoc} */
71 @Override
72 public final Time.Rel getStepSize()
73 {
74 return this.duration;
75 }
76
77 /** {@inheritDoc} */
78 @Override
79 public final String getName()
80 {
81 return "Fixed";
82 }
83
84 /** {@inheritDoc} */
85 @Override
86 public final String getLongName()
87 {
88 return "Fixed GTU following model";
89 }
90
91 /** {@inheritDoc} */
92 public final String toString()
93 {
94 return "FixedAccelerationModel " + this.duration + ", " + this.acceleration;
95 }
96
97 }