1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/*
Copyright (c) Xerox Corporation 1998-2002. All rights reserved.
Use and copying of this software and preparation of derivative works based
upon this software are permitted. Any distribution of this software or
derivative works must comply with all applicable United States export control
laws.
This software is made available AS IS, and Xerox Corporation makes no warranty
about the software, its performance or its conformity to any specification.
|<--- this code is formatted to fit into 80 columns --->|
|<--- this code is formatted to fit into 80 columns --->|
|<--- this code is formatted to fit into 80 columns --->|
Game.java
Part of the Spacewar system.
*/
package spacewar;
import java.awt.Dimension;
/**
* The Game class is the root of the spacewar game. To start a spacewar
* game, you can either call the main method, or instantiate this class
* directly.
*
* Synchronization is done by the GameSynchronization aspect.
*/
public class Game extends Thread {
/**
* To run the game from top level, simply say Java Game, as usual. Passing
* an argument makes the game run in demo mode. Without an argument it runs
* in the normal player mode.
*/
public static void main(String[] args) {
if ( args.length == 0 )
new Game("1").run();
new Game(args[0]).run();
}
private Timer timer;
private EnergyPacketProducer ePP;
private Registry registry;
private Pilot pilot1, pilot2;
private Dimension screenSize = new Dimension(500, 500);
Registry getRegistry() { return registry; }
Pilot getPilot1() { return pilot1; }
Pilot getPilot2() { return pilot2; }
/** returns the width of the screen, delegating to screenSize */
int getWidth() { return screenSize.width; }
/** returns the height of the screen, delegating to screenSize */
int getHeight() { return screenSize.height; }
/**
* To run the game, simply instantiate this class. It runs in its own
* thread. You can instantiate multiple games at once. For the time being
* the only way to end the game is to exit from the Java VM.
*
* @param isDemo Controls whether the game runs in demo mode or not. True
* means it is a demo, false means it runs in normal 2 player mode.
*/
public Game(String mode) {
timer = new Timer(this);
ePP = new EnergyPacketProducer(this);
registry = new Registry(this);
}
public void run() {
timer.start();
ePP.start();
while(true) {
try {
newRobot(3);
Thread.sleep(15000);
}
catch (InterruptedException e) {}
}
}
/**
* add a robot to the game. This is a menu command.
*/
void addRobot() {
newRobot(3);
}
/**
* resurrect the ships in the game. This is a menu command.
*/
void resetShips() {
Ship[] ships = registry.getShips();
for (int i = 0; i < ships.length; i++) {
Ship ship = ships[i];
Pilot pilot = ship.getPilot();
newShip(pilot);
}
}
/**
* leave the game. This is a menu command.
*/
void quit() {
System.exit(0);
}
void error(Object o) {
System.err.println(o);
}
/**
* returns a new player. With {@link #newRobot} and {@link
* #newShip}, the only ways to make a Player, a Robot, or a Ship.
* The structural invariant is that there should be no calls to
* new of one of these three classes outside these three methods.
*/
Player newPlayer(int number) {
Player player = new Player(this, number);
newShip(player);
return player;
}
/**
* returns a new robot. With {@link #newPlayer} and {@link
* #newShip}, the only ways to make a Player, a Robot, or a Ship.
* The structural invariant is that there should be no calls to
* new of one of these three classes outside these three methods.
*/
Robot newRobot(int number) {
Robot robot = new Robot(this, number);
newShip(robot);
robot.start();
return robot;
}
/**
* returns a new ship. With {@link #newRobot} and {@link
* #newPlayer}, the only ways to make a Player, a Robot, or a
* Ship. The structural invariant is that there should be no
* calls to new of one of these three classes outside these three
* methods.
*/
Ship newShip(Pilot pilot) {
//
// If there is an old ship (we're doing a reset), then remove it from
// the registry.
//
Ship oldShip = pilot.getShip();
if (! (oldShip == null))
oldShip.die();
Ship newShip = new Ship(this,
Math.random() * getWidth(),
Math.random() * getHeight(),
Math.random() * Math.PI * 2);
pilot.setShip(newShip);
newShip.setPilot(pilot);
return newShip;
}
void clockTick() {
registry.clockTick();
handleCollisions();
}
// collision detection
void handleCollisions() {
SpaceObject[] objects = registry.getObjects();
SpaceObject objI, objJ;
for (int i = 0; i < objects.length; i++) {
objI = objects[i];
for (int j = i + 1; j < objects.length; j++) {
objJ = objects[j];
if (objI instanceof Bullet && objJ instanceof Bullet)
continue;
if (isCollision(objI, objJ)) {
if (objI instanceof Ship && objJ instanceof Ship)
Ship.bounce((Ship)(objI), (Ship)(objJ));
else {
objI.handleCollision(objJ);
objJ.handleCollision(objI);
}
}
}
}
}
/*
* Is the distance between the two centers less than the sum of the two
* radii. This is a cheap and dirty (i.e. wrong) implementation of this.
*/
static boolean isCollision(SpaceObject a, SpaceObject b) {
return (Math.abs(a.getXPos() - b.getXPos()) +
Math.abs(a.getYPos() - b.getYPos())) <
(a.getSize()/2 + b.getSize()/2);
}
}
|
