Games' Controling by Mobile Phone's Sensors on Android PlatformLecturer: Lisa HuaProducer: Jack Shi

PM: Yinlan ZhaoTM: Yemin SuiSoftware Institute, NJU

Software Institute, Nanjing University

Contents Everything From the Name

Innovations

Market Analysis

Everything From the Name

What is in the name “Mobic”?

Mobic = Mobile + Computer The logo “Mobic” is from Google

from

Innovations

Innovation-1: The project’s name and logo

Innovation-2: User Experience

Innovation-3: User Interface

Innovation-4: Powerful Program Interface

Innovation-6: Data Processing

Innovation-7: Not only games

Innovation-5: Using XML

Innovation-2: User Experience

Give a sense of reality to users.

It allows users to exercise instead of using mouse and keyboard only.

Games is no longer only a game, they are sports that your opponent is PC

Innovation-3: User Interface

open source

Use the thought of games’ control in the UI control.

Your only work on PC is double click the application.

Make users feel that the routine use the system is very smooth, and make the system keep consistent and convenient.

TM

Innovation-4: Powerful Program Interface

Mobile Terminal:

The difference between Sofa Mode and Sports Mode is using different sensors.

The Routine to Start a Mode

Create a new object, newMode

newMode.start();

newMode.suspend();

newMode.cancel();

newMode.prepare();

How to extend?

Extend a new abstract mode like SofaMode and SportsMode

Implement a new mode for game like Game_SpeedMode

Override prepare() to set sensors that to be used

Implements the abstract method process(Message msg);

Override cancel() to unregister sensors that be used

This method is used for process data from sensors

Motion Definition

Initialize a motion by using constructor according to your process in the method process(Message msg);

The only job you should do is

Then dispatch it by motion.dispatch();

Nearly the same with mobile terminalThe motion on PC we call it

Action

PC Terminal

When we get a Action newAction, we use

newAction.doAction() to control our game.

Innovation-5: Using XML

Properties Examplename VR2installpath F:\vr2\project\Ppj2dd.exe actionList name Forward

info 前进key W

Using xml to configure a game’s properties make the Expansibility stronger.

Innovation-6: Data Processing —— Difficulties

Sensor data is not very accurate;1

Acceleration Sensor’s data is not the real acceleration, they include the gravity.2

The data are very small like 0.000213111;3

The problem of multi-thread.4

Frameworks designed for performance

Frameworks designed for performance

Solutions——How to get accelerations?

Firstly, get the acceleration that has gravity component, and orientation data.

acc_x=acc[0]-9.8*sinθ

acc_y=acc[0]+9.8*sinα

acc_z=sqrt(9.82-acc_x2-acc_y2)

xy

z

G

Solutions——Data are too small to computer

V = V0+ATS = V0T+0.5*AT2

To make the computing get a suitable result, we magnify the time T 1000 times.

The result S is often NAN because the T=50ms=0.05s.

Solutions——Multi-Thread Problem

Message msg = mode.getDataHandler().obtainMessage(1, msg_obj);mode.getDataHandler().sendMessage(msg);

To solve the chaos of multi-thread, and get data in order, we use message mechanism

SensorEventListenerMessageQueueMode.process(Message msg)

So many games!

Speed SBKX VR2Tennis

Innovation-7: For Games, But Not Only Games

Innovation-7: For Games, But Not Only Games

In the future, even in the remote control domain for TVs or others

Market Analysis

Our AdvantagesLow Cost

Large Number of Users

Conveniences

Easy to Maintain

Our AdvantagesLow Cost

We needn’t to develop games for our system, the system’s task is to improve users’ experience on existed games on PC.

On the other hand, you needn’t buy more equipment. You only need an Android mobile phone.

Our Advantages

ConvenienceYou needn’t carry other equipment. You can use the

system wherever and whenever only if you have a mobile phone and a computer.

Our Advantages

Powerful interface and using xml make the system is so easy to extend that you needn’t change its source code.

On the other hand you needn’t maintain the games the system control.

Easy to maintain

Our Advantages

Large Number of

Users• In China, there are more than 0.1 billion computer

users;• This shows that we have many users and potential

users;• In China, the users of Android has exceed Iphone;

and in the world even though the users of Android is less than Iphone, but it is increasing very fast.

Summary

Mobic is a system that has lower risk than other same kind products

Low cost;Number of users;Easy to maintain;Convenience;Etc.

MobicTM

JUNE 7-10, 2010 | NEW ORLEANS, LA

Q&A

DECEMBER 21-10, 2010 | Nanjing, Jiangsu

MobicTM

2010 PRC