1 package org.opentrafficsim.road.gtu.lane.tactical.following;
2
3 import org.djunits.unit.AccelerationUnit;
4 import org.djunits.value.vdouble.scalar.Acceleration;
5 import org.djunits.value.vdouble.scalar.Length;
6 import org.djunits.value.vdouble.scalar.Speed;
7 import org.djunits.value.vdouble.scalar.Time;
8
9 /**
10 * Fixed GTU following model. This GTU following model does not react in any way to other GTUs. Instead it has a predetermined
11 * acceleration for a predetermined duration.<br>
12 * Primary use is testing of lane based GTU movement.
13 * <p>
14 * Copyright (c) 2013-2015 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
15 * BSD-style license. See <a href="http://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
16 * <p>
17 * @version $Revision: 1378 $, $LastChangedDate: 2015-09-03 13:38:01 +0200 (Thu, 03 Sep 2015) $, by $Author: averbraeck $,
18 * initial version 6 feb. 2015 <br>
19 * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
20 * @author <a href="http://www.tudelft.nl/pknoppers">Peter Knoppers</a>
21 */
22 public class FixedAccelerationModel extends AbstractGTUFollowingModelMobil
23 {
24 /** Acceleration that will be returned in GTUFollowingModelResult by computeAcceleration. */
25 private Acceleration acceleration;
26
27 /** Valid until time that will be returned in GTUFollowingModelResult by computeAcceleration. */
28 private Time.Rel duration;
29
30 /**
31 * Create a new FixedAccelerationModel.
32 * @param acceleration Acceleration; the acceleration that will be returned by the computeAcceleration methods
33 * @param duration Time.Rel; the duration that the acceleration will be maintained
34 */
35 public FixedAccelerationModel(final Acceleration acceleration, final Time.Rel duration)
36 {
37 this.acceleration = acceleration;
38 this.duration = duration;
39 }
40
41 /**
42 * Retrieve the duration of this FixedAccelerationModel.
43 * @return Time.Rel; the duration of this FixedAccelerationModel
44 */
45 public final Time.Rel getDuration()
46 {
47 return this.duration;
48 }
49
50 /**
51 * Retrieve the acceleration of this FixedAccelerationModel.
52 * @return Acceleration; the acceleration of this FixedAccelerationModel
53 */
54 public final Acceleration getAcceleration()
55 {
56 return this.acceleration;
57 }
58
59 /** {@inheritDoc} */
60 @Override
61 public final Acceleration computeAcceleration(final Speed followerSpeed, final Speed followerMaximumSpeed,
62 final Speed leaderSpeed, final Length.Rel headway, final Speed speedLimit, final Time.Rel stepSize)
63 {
64 return this.acceleration;
65 }
66
67 /** {@inheritDoc} */
68 @Override
69 public final Acceleration computeAcceleration(final Speed followerSpeed, final Speed followerMaximumSpeed,
70 final Speed leaderSpeed, final Length.Rel headway, final Speed speedLimit)
71 {
72 return this.acceleration;
73 }
74
75 /** {@inheritDoc} */
76 @Override
77 public final Acceleration getMaximumSafeDeceleration()
78 {
79 // TODO should be specified in constructor
80 return new Acceleration(2, AccelerationUnit.METER_PER_SECOND_2);
81 }
82
83 /** {@inheritDoc} */
84 @Override
85 public final Time.Rel getStepSize()
86 {
87 return this.duration;
88 }
89
90 /** {@inheritDoc} */
91 @Override
92 public final String getName()
93 {
94 return "Fixed";
95 }
96
97 /** {@inheritDoc} */
98 @Override
99 public final String getLongName()
100 {
101 return "Fixed GTU following model";
102 }
103
104 /** {@inheritDoc} */
105 public final String toString()
106 {
107 return "FixedAccelerationModel " + this.duration + ", " + this.acceleration;
108 }
109
110 }