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1. Player 1 Fire SPACE Move Right RIGHT ARROW Player 2 Move Left Q Move Right W Fire autofire Player 3 Move Left A Move Right S Fire autofire ICS FORTH HCI Laboratory 18 Access Invaders User Manual v 1 0 Player 4 Move Left Z Move Right X Fire autofire Other Activate In game Menu Pause ESC ICS FORTH HCI Laboratory 19 Access Invaders User Manual v 1 0 T Implementation information Access Invaders was developed in C using the following 3d party tools SDL a low level cross platform graphics and input library Used for drawing the graphics on the screen and getting input from the interaction devices supported by the game OpenAL a cross platform 3D sound library Used for the reproduction of sound effects synthesized speech and music Festival Lite Flite a cross platform runtime speech synthesis engine Used for synthesizing speech from the textual messages and objects that appear on the screen Freetype a font engine for true type font rendering Used for rendering the textual messages and objects that appear on the screen Ogg Vorbis an open patent free professional audio encoding decoding and streaming technology Libvorbis is used for the decoding of ogg music files http www libsdl org http www openal org http www speech cs cmu edu flite http2. Access Invaders currently offers the following predefined profiles 1 2 3 Basic a remake of the original Space Invaders game Single switch the whole game menus amp gameplay can be controlled using a single mouse button a keyboard key or any type of switch X Large enlarged sprites and fonts suitable for people with low vision or a very small screen Non visual the gameplay is adapted for non visual gameplay suitable for blind people or anyone who would like to play without using or looking at the screen Classic the content and gameplay characteristics of the Basic profile are adapted to the look and feel of the original Space Invaders game Demo a demonstration of the level of configurability that 4ccess Jnvaders can offer Chess Invaders an inside joke on the UA Chess game also developed by the HCI Laboratory of ICS FORTH where the content of the Basic profile is adapted using sprites from the UA Chess game http www ics forth gr hci ua games uachess ICS FORTH HCI Laboratory 6 Access Invaders User Manual v 1 0 More details about each profile are included in Section 6 Default Game Profiles You can select a profile using anyone of the following methods which can also be configured e Mouse a point and click using the left mouse button on the profile name or b use the mouse wheel if available to iterate through the available menu options and activate the
3. 1 e it can be concurrently played by people with different abilities and preferences including people with disabilities e g low vision blind and hand motor impaired Access Invaders follows the principles of UA Games and achieves Universal Access by supporting alternative input output modalities and interaction techniques that can co exist and cooperate in the game s user interface combined with tailorable player profiles and game content The game 1s highly customizable and supports the creation and use of unlimited user profiles Each game parameter can be adapted both based on the player s profile and the current game level Every aspect of the game s functionality is fully accessible through the mouse the keyboard any type of switches and the joystick For each device several alternative interaction techniques the parameters of which can be customized are supported Non visual audio based gameplay is also supported In this case full acoustic rendering of game information 1s provided through the use of spatial audio and of a built in screen reader In fact the interaction capabilities of Access Invaders allow it to provide access even to people with combinations of disabilities as for example blind hand motor impaired persons Multi player games are also available where people with different dis abilities can play cooperatively sharing the same computer In this case the game s interaction parameters can be independent
4. Joystick 1 joystick s axes 0 N joystick0 0 joystick0 1 joystick0 N 2 joystick s axes 0 K joystick1 0 joystick1 1 joystick1 K M joystick s axes 0 Z joystickM 0 joystickM 1 joystickM Z A 2 Output configuration The game s visual output can be fully customized through the following conf files Fonts conf characteristics of any text presented Platforms conf appearance of the protective shields AnimationFilms conf in combination Game conf appearance of the aliens and the player s spaceship Widgets conf appearance of the menus and text entry screen The game s auditory output can be configured through the following files Music conf the music that plays during the game or at the menu screens _ Sounds conf in combination Game conf sound effects ICS FORTH HCI Laboratory 28 Access Invaders User Manual v 1 0 The description and documentation of the detailed options provided by these files is beyond the scope of this manual A 3 Gameplay configuration The gameplay can be configured through Game conf In the main section of the file the following options can be set activealiens number of attacking groups of aliens _ activespaceships number of concurrent players that can be activated during the game The options that affect the behavior of each group of aliens reside under the sections entitled alienN where N 1s the
5. www freetype org index2 html http www vorbis com ICS FORTH HCI Laboratory 20 Access Invaders User Manual v 1 0 8 Frequently Asked Questions FAQ 1 Is there going to be a interactive application for configuring the game and creating editing profiles Yes we plan to create one in the near future If you want to be informed about it please contact us 2 Will the game also support mp3 in addition to ogg For the time being no 3 Is recording and playback supported for a game session Yes However the recording and playback support 1s experimental and thus was removed from the current release It is planned that the next version of the game will definitely support recording O ICS FORTH HCI Laboratory 21 Access Invaders User Manual v 1 0 9 Background 9 1 Universally Accessible Games UA Games A major goal of the of the HCI Laboratory and of the Centre for Universal Access amp Assistive Technologies of ICS FORTH is the active support of the electronic inclusion e inclusion of all citizens including people with disabilities to the Information Society through the design of products and services that follow the principles of Universal Access and Design for All As part of this goal we pursue the development of Universally Accessible Games UA Games i e interactive computer games that e follow the principles of Universal Access and Design for All e are proactively designed to optimally fit
6. GNU Linux uncompress the game s archive access invaders 1 0 tar gz You can do this from the command line by typing far zxvf access invaders 1 0 tar gz To run the game just invoke the executable invaders that is located in the newly created directory access invaders 1 0 Note for expert Linux users the distribution package 1s self contained so that you do not need to install any additional libraries in order to play the game If however you already have any of the required libraries installed these can be safely removed from the Lib sub directory as the game itself uses unmodified versions of these libraries 7 As long as the user has write permissions to the installation folder ICS FORTH HCI Laboratory 4 Access Invaders User Manual v 1 0 4 Introduction to the Game As in the original Space Invaders game your mission is to prevent a group of aliens to land on the ground where your spaceship is located by shooting them down Your spaceship 1s equipped with a cannon with infinite ammunition e The aliens traverse move from the left end of the screen to the right and vice versa while also moving closer and closer to the ground Also they constantly throw bombs against your spaceship e A range of shields exists between the aliens and your spaceship which you can use as cover Unfortunately they are gradually worn out by incoming shots coming from you or the aliens e Periodically an alien mothership appear
7. amp Foundation for Research amp Technology Hellas Institute of Computer Science le hs Human Computer Interaction Laboratory amp Centre for Universal Access amp Assistive Technologies Access INVADERS http www ics forth gr hci ua games access invaders User Manual v 1 0 January 2006 O ICS FORTH HCI Laboratory 1 Access Invaders User Manual v 1 0 Table of Contents ds AIAOGUCHODN hee tcm CC m 3 2 Technical IRegdulrerells se cena vives eques ag petuum ne Ve S CEPR M ER RV UE 4 S MEM MIS Pe AMO RE ndd mE 4 Oui MICEOSO E WINDOWS uen Yd ues Qr dev dus celu Y tement en ete 4 3 2 ONUIEIDU CEREREM T 4 4 Introduction to the Gaeau eu en drea lues ee amu bd utut ust Pin Dre Pe EFE anne 5 5 Playing the Gale eerta ertet fu en dotem ob c pat uten eats 6 Dilys GEEN a prO E aei ate thee cae D tmm 6 Oe Main Men ei aa Rd O GY iddn Acn Rd M COMI ERE T S3 CONTONA N SDAC SNID nn fe ne 8 Se da game MONS an ne 9 STEMS uiae et tk ace es ed eae ede 9 6 Default Game Profiles Characteristics amp Controls 11 Cl ASIC coc NEO DO FED G 11 6 1 1 deje O 12 025 Single SWINGIN 3 uode eot at beau orn Sosa tli ade y ea RG dn 13 6 2 1 CONTOS RET UU MM TE 13 RD tfr 14 6 3 1 COMMONS ae aora pi eM M tU MM ESI RM DES 14 OG NODSVISUGS eaa a fase uiaten ua ERAS RR iuste du tse MUERE 15 6 4 1 COMME ONS AR dd nn CLA MU STEM MP 15 os I II
8. and adapt to different individual gamer characteristics without the need of further adjustments or developments e can be concurrently played among people with different dis abilities 1deally also when sharing the same computer e can be played on alternative technological platforms and contexts of use using a large variety of devices including assistive technologies The underlying vision 1s that through such games people will be able to have fun and compete on an equal basis while interacting easily and effectively irrespective of e their individual requirements skills and preferences e the technology they use e where they are UA Games strongly cater for the needs and actively support the right of all people for social interaction and play irrespective of their individual differences thus providing a steppingstone towards a more inclusive and fun Information Society The Centre for Universal Access and Assistive Technologies actively cooperates with several groups and associations of disabled people at national and international level In this context our research and development work involves disabled users at different stages that contribute either as expert consultants or as potential end users 9 2 Space Invaders Access Invaders 1s based on the Space Invaders arcade Figure 7 game which was designed by Toshihiro Nishikado of TAITO corp and was released in 1978 1n Japan and later to the United States of Americ
9. in seconds during which the spaceship is invulnerable to the alien attacks and flashes smartbullet denotes whether the spaceship s bullets can pass through the shields when this option is set to True or collide with them option set to False missiledelay the delay in milliseconds after which the spaceship bullet s will move 1 e this option affects the bullets speed O ICS FORTH HCI Laboratory 29 Access Invaders User Manual v 1 0
10. keyboard lctrl Control right keyboard rctrl Alt left keyboard lalt Alt right keyboard ralt Win left keyboard lsuper Win right keyboard rsuper Meta left keyboard lmeta Meta right keyboard rmeta Menu keyboard menu Euro keyboard euro Keypad 0 9 keyboard kp0 keyboard kp9 Keypad Enter keyboard kp enter Keypad keyboard kp period Keypad keyboard kp plus Keypad keyboard kp minus Keypad keyboard kp multiply Keypad keyboard kp divide ICS FORTH HCI Laboratory 27 Access Invaders User Manual v 1 0 Joystick 1 joystick s buttons 0 N joystick0 0 joystick0 1 joystick0 N 2 joystick s buttons 0 K joystick1 0 joystick1 1 joystick1 K M joystick s buttons 0 Z joystickM 0 joystickM 1 joystickM Z A 1 2 Axes In addition to keys and buttons the spaceship s movement can be affected by the axis provided by a hardware device e g mouse or joystick The related configuration 1s described in the Game conf file in the section entitled spaceshipN where N is the player s number e g playerl player2 In this section if the axismotion option is defined and contains a valid axis string then this axis 1s used for movement in addition to any keys buttons used The valid values for axismotion are described below in Section Q A 1 2 1 Axes values reference Mouse X axis mouse 0 y axis mouse 1
11. ON ICS FORTH HCI Laboratory 14 Access Invaders User Manual v 1 0 6 4 Non visual A version of the game adapted to suit non visual gameplay Its main characteristics are the following There is only one group of aliens with a single column of one or more aliens The aliens do not fire against the player the player s lives counter 1s omitted The player can fire against the aliens but only two bullets can be concurrently active The game is over only if an alien touches the ground The background 1s not drawn There are no protective shields Score changes and interaction with the user interface provides audio feedback The spaceship emits a spatial sound so that its position can be inferred acoustically The group of aliens also emits a distinctive sonar like sound 6 4 4 Controls Player 1 Move Left LEFT ARROW Move Right RIGHT ARROW Fire SPACE Other Activate In game Menu Pause ESC Read Score right ALT ICS FORTH HCI Laboratory 15 Access Invaders User Manual v 1 0 6 5 Classic This profile tries to 1mitate the atmosphere and game play of the original Space Invaders game by e Using retro fonts and sprites for the aliens the shields the spaceship and the mothership Being single player Having only one group of aliens Using retro sound effects 6 5 1 Controls Player 1 Move Left LEFT ARROW Move Right RIGHT ARROW Fire
12. SPACE Other Activate In game Menu Pause ESC ICS FORTH HCI Laboratory 16 Permitting only one bullet to be active at any given time Access Invaders User Manual v 1 0 6 6 Demo This profile constitutes a showcase of the configuration capabilities of Access Invaders Its main characteristics are the following e There are three distinct groups of aliens e Four players can play concurrently cooperative game e Playerl yellow can destroy only the that aliens belong to one of the groups the insect looking ones and can be destroyed by any alien e Player2 gray can destroy any alien but can only be destroyed only by aliens belonging to one of the groups the insect looking aliens e Player2 s bullets do not collide with the shields they pass through them e Player2 can be controlled using a single switch 6 6 1 Controls Player 1 Move left LEFT ARROW Move Right RIGHT ARROW Fire SPACE Player 2 Toggle Movement Direction Other Activate In game Menu Pause ESC ICS FORTH HCI Laboratory 17 Access Invaders User Manual v 1 0 6 7 Chess Invaders SCORE 00000 LIVES 007 A profile offering another variation to the original game s look and feel Its distinctive characteristics are that e tcan be played by concurrently four players e tuses sprites that come from a chess game e Only one bullet can be active at any given time 6 7 1 Controls
13. a by Midway The game was a huge success especially 1n Japan where allegedly it caused a shortage of 100 Yen coins The http www ics forth gr hci ua games ICS FORTH HCI Laboratory 22 Access Invaders User Manual v 1 0 immense popularity of the game however was stigmatized by the large number of thefts done by teenagers whose sole motive was to find more money to support their Space Invaders addiction Other interesting trivia about the game apart from the absolutely vast number of remakes it had and obviously has to sustain include the fact that one of the most important characteristics of space invaders the increase in the speed of the aliens when one of them was killed was a side effect of the execution of the game on the original arcade machine which was able to process the game data faster as it had to compute the movement of less aliens 4 SPACE INVADERS fm SCORES1 gt Hr scoRE scoRe lt 2 gt ONE OR TWO PLAYERS INSERT COIN S SELECT ONE OR TWO PLAYER GAME e TO MOVE LASER BASE LEFT OR RIGHT OPERATE THE CONTROL LEVER e TO FIRE LASER PUSH FIRE BUTTON UFO HIT GIVES PLAYER MYSTERY SCORE EXTENDED PLAY FOR 1500 POINTS GAME OVER WHEN PLAYER S LASER BASE IS HIT 3 TIMES BY INVADER MISSILES OR WHEN INVADERS OVERRUN THE BASE eiN TWO PLAYER MODE PLAY ALTERNATES BETWEEN THE TWO EM ME rni TAITO CORPORATION Figure 7 Original Space Invaders game instructions left and screenshot
14. crc 16 6 5 1 CONTRE ce et ne Lin Y OO 16 OOs DEMO ET ES 17 6 6 1 eje TIE 17 O CINESS INVACCTS iesus Fd a agp mates c M IE ec 18 6 7 1 COD ONS RS es ura tassa fn Sa tou ordi pa SS aua 18 7 Implementation information 20 8 Frequently Asked Questions FAQ 21 S JBacKGrouTid d nsc oan ect dem des se ce te eee 22 9 1 Universally Accessible Games UA Games 22 9 2 opace A 9 10 012 CE SN Noe wedrcusu dtu CN ORE GG dune 22 TO SCONCE IM Oe we asit RS GL un qe tus bei reo dr re e LEE NO 24 Annex A Configuring the Game esses eene nnne AFR LLA LLW LL nnns 25 A 1 Input COMMON AT OND iustos dendo E oT dine tah ee oil 25 Ac IRC VSI BUtTODS SR Rd A Dd 25 A LISE Keys Butons values reference sooo oui ate eei aub acl i tid 26 XE Mi I Ee 28 Ac AX es values BOLE Len CO sacra eoi eo ceto onmes etate adus seal a mati FO A od 28 P 2o OU Dubcontigiballol cuidas seth ached diete nd Ie od ues NY NN Nr LU P ee 28 A 3 Gameplay configuration ss 29 ICS FORTH HCI Laboratory 2 Access Invaders User Manual v 1 0 1 Introduction Access Invaders is an accessible remake of the classic Space Invaders game developed by the Human Computer Interaction Laboratory of ICS FORTH in close cooperation with the Centre for Universal Access amp Assistive Technologies in the context of the Universally Accessible Games UA Games Activity Access Invaders 1s designed to be Universally Accessible
15. currently highlighted by pressing the left mouse button in this case the mouse pointer should not be over a menu item e Keyboard use the UP DOWN or the LEFT RIGHT arrow keys to browse the menu options and the SPACE or the RETURN key to select In addition to the above the profile names are scanned automatically 1 e the focus shifts from a profile to the next one every 4 seconds Then you can activate the currently focused profile using any of the aforementioned methods You can change the active profile at any time To access the Profile Selection Menu just select the related option from the game s Main Menu 5 2 Main Menu After selecting a profile a short introductory text followed by the game credits 1s presented You can skip this by pressing any key including mouse and joystick buttons Then the game s Main Screen Figure 3 appears By pressing again any key the game s Main Menu Figure 4 fades in This menu can be used similarly to the Profile Selection Menu with some adaptations depending on the currently active player profile An accessible version of the class aders game This ought to be the default look and Teebof the game Note This game is based on a true story Copyright c 2005 HCI laboratory 198 New witi brand new digital effects Figure 3 Main Screen The Main Menu offers the following options e New Game starts a new game using the currently active profile e Change Pro
16. essing RETURN e Using the mouse you can directly point and click any character of the virtual keyboard e Using the mouse wheel you can shift the focus among lines and characters similarly to using the arrow keys Use the left mouse button to select in this case the mouse pointer should not be over any character If automatic scanning 1s enabled in the current profile the focus moves automatically among the lines and characters of the virtual keyboard You can select the currently focused item by pressing RETURN or the left mouse button Test the textEntry Rccess Inuaners 1 Figure 6 Text entry screen Depending on the active profile the text entry screen may additionally provide an audible user interface In this case each character is read aloud when it gets the focus Additionally when a character 1s typed in the current text entry 1s read The text entry screen can infer 1f the return key was pressed to activate the currently selected symbol or to denote the end of the typing session through the following heuristic rule a when the user uses the physical keyboard to input text the return key is used to denote the end of the typing session b when the virtual keyboard is used e g through the arrow keys or the mouse wheel the return key acts as a mechanism for the activation of the currently focused character Thus although both input methods use the keyboard as an input device they can be freely mixed w
17. file go back to the Profile Selection Menu see Section 5 1 ICS FORTH HCI Laboratory 7 Access Invaders User Manual v 1 0 Options contains the following Toggle Full Screen select if the game will be displayed in a window or in the whole screen Test Text Entry demonstration of how a user can input text in the game e g when a score qualifies for the Hall of Fame Hall of Fame the scores of the top 10 players Each distinct profile has its own Hall Of Fame Quit exit Access Invaders 4 Bat lets cf aliens Figure 4 Main Menu 5 3 Controlling the Spaceship In general the player s spaceship can be controlled using any or all of the following devices e Keyboard e Mouse e Joysticks or joystick compatible game pads e Switches emulating keystrokes User controls differ depending on the active game profile and the player number e g 1 player Ds player User controls for each game profile are described in detail in Section 6 Default Game Profiles ICS FORTH HCI Laboratory 8 Access Invaders User Manual v 1 0 5 4 In game Menu Figure 5 In game Menu While playing you can activate the n game Menu Figure 5 through which you can do the following e Continue Game return to the game and continue playing e Abort Game end the current game and return to the Main Menu e Restart Game restart the current game e New Player add another player to the current game if this op
18. he focus to the object that is above the currently selected one down the button used to move the focus to the object that is below the currently selected one left the button used to move the focus to the object that is to the left of the currently selected one right the button used to move the focus to the object that 1s to the right of the currently selected one activate the button used to select activate the object that has the focus cancel the button used to deselect deactivate the currently selected object A 1 1 1 Keys Buttons values reference Mouse Left button mouse left Right button mouse right Middle button mouse middle Wheel up mouse wheelup Wheel down mouse wheeldown ICS FORTH HCI Laboratory 26 Access Invaders User Manual v 1 0 Keyboard Left keyboard left Right keyboard right Up keyboard up Down keyboard down 0 9 keyboard 0 Keyboard 9 a Z keyboard a keyboard z F1 F15 keyboard f1 keyboard f15 Backspace keyboard backspace Tab keyboard tab Return keyboard return Escape keyboard escape Space keyboard space Insert keyboard insert Delete keyboard delete Home keyboard home End keyboard end Page up keyboard pageup Page down keyboard pagedown Shift left keyboard Ishift Shift right keyboard rshift Control left
19. ithout a problem If you want to try out how text entry works without having to achieve a high score first you can select Test Text Entry from the Options menu O ICS FORTH HCI Laboratory 10 Access Invaders User Manual v 1 0 6 Default Game Profiles Characteristics amp Controls The interactive behaviour and the content of the game 1s highly customizable and can be configured through the use of alternative game profiles This section describes the characteristics of the profiles that are created by default can installing the game For more information about editing these profiles or creating new ones please refer to Annex Configuring the Game Access Invaders includes the following profiles Basic single switch X Large Non visual Classic Demo Chess Invaders te ob n s In addition to the specific controls described in each distinct profile the following shortcuts can also be used General Shortcuts Toggle Full Screen Window mode F11 Toggle Sound effects mute M 6 1 Basic IS f E A remake of the original Space Invaders game Basic characteristics e Contains two groups of aliens e Support for four concurrent players cooperative game ICS FORTH HCI Laboratory 11 Access Invaders User Manual v 1 0 All players can destroy and can be destroyed by all groups of aliens Only two bullets can be active at any given time The game s pace 1s quite fast 6 1 1 C
20. ly but can be overridden in a specific profile while any changes made to a file in an alternative profile subdirectory affect only the specific profile Note The enumeration and documentation of all the available configuration categories and their parameters as well as the provision of a detailed account of how a new profile can be created from scratch are beyond the scope of this version of the manual Thus in the following sections only a subset of the supported configuration categories are explained and documented in order on the one hand to allow players to be able to modify the most essential game parameters and on the other hand to help developing a mental model of how conf files are organised and used So do not hesitate to experiment with the conf files and try to totally redefine the game s look and feel even by changing parameters that may not be documented in this section A 1 Input configuration The game can receive input through the following hardware devices e Keyboard or any switch emulating the keyboard e Mouse e Joysticks or joystick compatible game pads The devices can be used both to interact with the user interface e g navigate through menus and to control the spaceship during the game The input provided by these devices can be divided in two types a keys buttons and b axes A 1 1 Keys Buttons The configuration of how keys and buttons affect player movement is described in
21. ly adjusted for each distinct player An unlimited number of concurrent players is supported Access Invaders can be found on line at www ics forth gr hci ua games access invaders http www ics forth gr hci ua games O ICS FORTH HCI Laboratory 3 Access Invaders User Manual v 1 0 2 Technical Requirements Access Invaders 1s designed to be cross platform The game can be played on any computer that runs Windows or GNU Linux More specifically the game s requirements include e Pentium class processor or higher e Display adapter capable of supporting a screen resolution of at least 1024x768 The adapter doesn t need to have 3D acceleration capabilities e Sound card Microsoft Windows XP or later or any recent distribution of GNU Linux e Screen resolution of at least 1024x768 when running the game in full screen more or greater for playing in window mode 3 Installation 3 1 Microsoft Windows To install the game in Microsoft Windows XP or later launch the setup program access invaders 1 0 exe and follow its instructions Note that the game does not require administrator privileges neither to install nor to run After the game is installed it will create a new entry entitled Access Invaders in the windows Start menu and optionally a desktop icon To run the game either select it from the Windows Start menu or double click on the desktop icon if it was created 3 2 GNU Linux To install the game in
22. number of a specific group e g the 1st group of aliens is under the aliensl section In these sections the most important options that affect the gameplay are the following aliensperline number of aliens in each line of the group lines number of lines that form the current group xdistance distance in pixels between two adjacent aliens in the horizontal axis ydistance distance in pixels between two adjacent aliens in the vertical axis xoffset distance in pixels which the aliens travel each time they move in the in the horizontal axis yoffset distance in pixels which the aliens travel each time they move in the in the horizontal axis bombfrequency the time interval in milliseconds after the group throws bombs bombdelay the time interval in milliseconds after which the group s bombs will move bomboffset number of pixels 1 e the combination of these two options defines the bomb s speed kill a list of player spaceships e g spaceshipl spaceship2 that can be destroyed by this group killed a list of player spaceships e g spaceshipl spaceship2 that can destroy aliens belonging in this group The player s spaceship behavior can be controlled through the following options movedelay the time interval 1n milliseconds after which the player s spaceship will move 1 e this option affects the spaceship s speed flashingdelay the time span
23. ontrols Move Right Player 1 LEFT ARROW RIGHT ARROW Player 2 Move Left q Move Right w Fire e Player 3 Move Left a Move Right s Fire d Player 4 Move Left z Move Right x Fire c Other Activate In game Menu Pause ESC ICS FORTH HCI Laboratory 12 Access Invaders User Manual v 1 0 6 2 Single switch This profile allows a player to interact with the game using only one switch e g keyboard key mouse joystick button This is achieved on one hand by letting the player control only the spaceship s movement direction while the spaceship moves and fires automatically at a predefined speed and on the other hand by using the automatic scanning technique for interacting with the user interface e g the menus text entry Also the in game menu can be invoked by pressing the switch for a predefined amount of time 6 2 1 Controls Player 1 Toggle Movement Direction RETURN Other Activate In game Menu Pause RETURN pressed for 5 seconds ICS FORTH HCI Laboratory 13 Access Invaders User Manual v 1 0 6 3 X Large Score 000000 Lives 003 This profile uses large sprites and fonts along with clear and simple visual elements 6 3 1 Controls Player 1 Move Left MOUSE Move Right MOUSE Fire LEFT MOUSE BUTTON Other Activate In game Menu Pause RIGHT MOUSE BUTT
24. right I http en wikipedia org wiki Space invaders ICS FORTH HCI Laboratory 23 Access Invaders User Manual v 1 0 10 Contact info For technical comments suggestions or questions please contact jgeorgal ics forth gr For any further information about Access Invaders please contact Anthony Savidis email as ics forth gr Tel 30 2810 391749 Fax 30 2810 391740 Foundation for Research and Technology Hellas FORTH Institute of Computer Science ICS Human Computer Interaction Laboratory Centre for Universal Access and Assistive Technologies Heraklion Crete GR 70013 Greece ICS FORTH HCI Laboratory 24 Access Invaders User Manual v 1 0 Annex A Configuring the Game Currently the game can only be configured by editing textual configuration files The configuration files have a conf suffix and they are contained in the Data Profiles subdirectory of the game The Profiles directory contains a default version of all the conf files required by the game It also contains subdirectories that represent alternative profiles These alternative profile subdirectories contain conf files the contents of which override the default ones An alternative profile subdirectory may contain only part of the required conf files for the ones missing the default files are used Thus any changes made to a conf file of the Profiles directory affect the game s characteristics global
25. s to the top of the screen and travelling from left to right If you manage to destroy it you get additional bonus points e When your spaceship gets destroyed it is replaced by a brand new one The number of spaceships also referred to as lives at your disposal 1s limited and it is indicated on the top of the screen right next to your score e The game ends when all of your spaceships have been destroyed If your final score is high enough you get a place in the Access Invaders Hall of Fame Of course in Access Invaders the presence the characteristics and the behavior of each distinct game element can be totally controlled and altered depending on the particular players characteristics reguirements and preferences A sample screenshot of the game illustrating the basic game elements 1s depicted in Figure 1 Figure 1 Sample game screenshot ICS FORTH HCI Laboratory 5 Access Invaders User Manual v 1 0 9 Playing the Game 5 1 Selecting a profile When Access Invaders starts the Profile Selection Menu Figure 2 appears from which you can select a profile for the current game session Profiles are sets of predefined either by the game designer or the user preferences regarding both the interaction parameters e g speech output switch based scanning input device selection and the game s content and appearance e g fonts sprites colors backgrounds sounds Figure 2 Profile Selection Menu
26. the Game conf file in the section entitled spaceshipN where N is the player s number e g playerl player2 This section includes the following options ICS FORTH HCI Laboratory 25 Access Invaders User Manual v 1 0 leftkey the button used to move the spaceship to the left rightkey the button used to move the spaceship to the right firekey the button used to fire a bullet The value of these options 1s a string enclosed in double quotes that describes a physical key button offered by any of the aforementioned hardware devices as described in Section 0 below If the device prefix is omitted then it 1s assumed to have the value keyboard Thus the option keyboard left is synonymous to left Option values are case insensitive e g keyboard fll is synonymous KEYboard F11 or just F11 Note If the automove option is set to True then leftkey has no effect In this case the rightkey is used to switch the movement direction of the spaceship which is constantly moving If the autofire option is set to True then the firekey is not used similarly to the above the configuration of how keys and buttons affect interaction with the game s user interface e g menus and text entries is described in the Widgets conf file in the section entitled events This section includes the following options up the button used to move t
27. tion 1s supported by the currently active profile The n game Menu can be activated by pressing the Esc key Additionally in each profile alternative ways for activating it can be defined e g the RETURN button is kept pressed for more than 4 seconds 5 5 Text entry Currently the text entry screen Figure 6 1s only used for typing in your name if your score qualifies for the Hall of Fame The screen contains a virtual keyboard which comprises several lines of letters numbers and symbols The last two symbols of the virtual keyboard are BS which can be used for erasing the last character of the typed text and OK which is used for ending the text entry session You can type some text using multiple alternative methods and any combination of them e Using the LEFT RIGHT or the UP DOWN arrow keys you can move the focus to the previous next line correspondingly The currently focused line is ICS FORTH HCI Laboratory 9 Access Invaders User Manual v 1 0 indicated by two horizontal lines framing it If you press the RETURN key the line 1s selected and using again the arrow keys you can shift the focus through the characters of the selected line You can type a character by pressing the RETURN key e Using the keyboard you can directly type in any character that is included in the virtual keyboard You can erase a character by pressing BACKSPACE and you can end the text entry session by pr
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