A simple two player java-based game powered by JMonkey game engine which implements many standard object oriented design patterns such as Singleton, Composite, Strategy and etc.

1. Tank battle
Farzad Nozarian - Vahid Ranaei
Amirkabir university of technology

2. References

3. Problem Definition
Tank Movement
Android Devices
 Orientation Sensors
Desktops
 ‘WASD’ Control Keys
VS.

4. Problem Definition
Tank Movement/Android Devices
public void onSensorChanged(SensorEvent sensorEvent) {
if (sensorEvent.sensor.getType() == Sensor.TYPE_ORIENTATION) {
float headingAngle = sensorEvent.values[0];
float pitchAngle = sensorEvent.values[1];
float rollAngle = sensorEvent.values[2];
// TODO Apply the orientation
changes to your application.
}
}

5. Problem Definition
Tank Movement/Desktop Devices
inputManager.addMapping("Lefts", new KeyTrigger(KeyInput.KEY_H));
inputManager.addMapping("Rights", new KeyTrigger(KeyInput.KEY_K));
inputManager.addMapping("Ups", new KeyTrigger(KeyInput.KEY_U));
inputManager.addMapping("Downs", new KeyTrigger(KeyInput.KEY_J));
inputManager.addListener(this, "Lefts");
inputManager.addListener(this, "Rights");

6. Problem Definition
Tank Movement/Desktop Devices
onAction
handler
if (binding.equals("Ups")) {
if (value) {
accelerationValue -= 800;
} else {
accelerationValue += 800;
}
player.accelerate(accelerationValue); }
else if (binding.equals("Rights")) {
if (value) {
steeringValue += -.5f;
} else {
steeringValue += .5f;
}
player.steer(steeringValue);
}

7. Problem Definition
Tank Movement
Some Abstractions
Fire
Move Forward (Accelerate)
Move Around (Steer)
…

8. Problem Definition
Tank Movement
vehicle.steer(steeringValue)
vehicle.accelerate(accelerationValue)
applyImpulse
resetSuspension
setPhysicsLocation
setPhysicsRotation
setLinearVelocity

9. Pattern Definition
• Decouple an abstraction from its implementation so that
the two can vary independently
• When abstractions and implementations should
be extensible through subclassing
Bridge!

10. Pattern Definition

11. Pattern Solution
Bridge

12. Problem Definition
Tank Shooting
Shooting In Real World !
Burst mode
Selective fire
Automatic firearm
Bump firing
Same ‘Fire’ Different Behaviors ?!

13. Pattern Definition
Tank Shooting
• Many related classes differ only in their behavior
• We need different variant of algorithm
• We need run-time shooting variation

14. Pattern Solution
Strategy

15. Problem Definition
World of Complexity!
Geometry
polygon mesh
material
specifying its shape
color
texture
opacity/transparency

16. Problem Definition
World of Complexity!
Spatial
Purpose:
Abstract data structure that stores user data and transformations
(= translation, rotation, scale) of elements of the 3D
Geometry Node
Visibility: visible 3D object
invisible "handle" for a group of
Spatials
Purpose: represent an object's look
structure and group Geometries
and other Nodes
Examples:
Box, sphere, player, building, terrain,
vehicle, missiles …
rootNode, audioNode, vehicleNode
or shipNode with passengers
attached, etc.

17. Pattern Definition
World of Complexity!
• Compose objects into tree structures to represent part-
whole hierarchies
• Clients treat individual objects and compositions of
objects uniformly
• We want clients to be able to ignore the difference
between compositions of objects and individual objects

18. Pattern Solution
World of Complexity!

19. Problem Definition
Family of Game Entities

20. Problem Definition
game configuration
Bunch of configurations !!
:

21. Problem Definition
game configuration
public static class UserBuilder {
private final String firstName;
private final String lastName;
..
public UserBuilder(String firstName, String
lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
public UserBuilder age(int age) {
this.age = age;
return this;
}
..
public User build() {
return new User(this);
}
}
}
public class User {
private final String firstName; // required
private final String lastName; // required
private final int age; // optional
private final String phone; // optional
private final String address; // optional
private User(UserBuilder builder) {
this.firstName = builder.firstName;
this.lastName = builder.lastName;
..
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
public user getUser(){
return new
User.UserBuilder(‘John’,’Doe’)
.age(30)
.phone(‘3235345)
.address(‘’Fake address 33)
.build();

22. Problem Definition
game configuration
public class Configuration {
private int displayResolution;// display resolution
private int displayMode;// full screen?
private int soundVolume;//Sound volume
private int musicVolume; //Music volume
//....
private Configuration(ConfigBuilder builder) {
this.displayResolution = builder.displayResolution;
this.displayMode = builder.displayMode;
..
}
public int getDisplayResolution() {
return displayResolution;
}
public int getDisplayMode() {
return displayMode;
}
..
public static class ConfigBuilder{
private int displayResolution=0;// display resolution
private int displayMode=0;// full screen?
private int soundVolume=0;//Sound volume
private int musicVolume=0; //Music volume
//....
public ConfigBuilder displayResolution(int dr)
{
this.displayResolution = dr;
return this;
}
public ConfigBuilder displayMode(int dm)
{
this.displayMode = dm;
return this;
}
..
public Configuration build(){
return new Configuration(this);
}
}
}

23. Problem Definition
game configuration
But it is not all of it ..

24. Problem Definition
game configuration
Builderton pattern !? :o

25. Problem Definition
game configuration
public class Configuration {
private static Configuration c;
private int displayResolution; // display resolution
private int displayMode; // full screen?
private int soundVolume; //Sound volume
private int musicVolume; //Music volume
//....
private Configuration(ConfigBuilder builder) {
this.displayResolution = builder.displayResolution;
this.displayMode = builder.displayMode;
this.soundVolume = builder.soundVolume;
this.musicVolume = builder.soundVolume;
}
public int getDisplayResolution() {
return displayResolution;
}
public int getDisplayMode() {
return displayMode;
}
…
public static class ConfigBuilder{
private int displayResolution=0;
private int displayMode=0;
private int soundVolume=0;
private int musicVolume=0;
//....
public ConfigBuilder displayResolution(int dr)
{
this.displayResolution = dr;
return this;
}
public ConfigBuilder displayMode(int dm)
{
this.displayMode = dm;
return this;
}
…
public Configuration build(){
if (c == null)
{ c=new Configuration(this);
return c;
}
else return c;
}
}
}

26. To Be Continue …