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Rolling Ball
The application
Rolling Ball is an arcade-style game for Symbian based mobile phones. In this game the
player is to control a ball on a track from top view. The goal of the game is to finish the track
– that is, to get the ball to a marked location – as fast as possible.
The control of the ball can be done by tilting the device in either direction, using the onboard
camera or can be done with the keyboard.
There are various object on the track, that makes advancing harder, such as ramps, pits, and
bridges.
The game can be played in single or multiplayer mode. In singleplayer mode, the goal is to
beat the clock. In multiplayer mode, two players race each other over Bluetooth.
User’s Manual
Hardware requirements
• Camera
• Bluetooth
• Symbian S60 3rd edition device
Install
Simply upload the installation file (rollingball.sisx) to the device. After that, the application is
ready to be installed.
Run
The application can be started from the Menu / My Own menu, by selecting the RollingBall
icon.
The main menu
After starting the application, you get to the main menu. Here you can browse through the
menu items using the up (or 2) and the down (or 8) buttons, and then you can select the
current item by pressing the OK (or 5) button. The curent menu item is marked with a star (*).
• Start singleplayer Starting a singleplayer game
• Start multiplayer Activates the Bluetooth submenu, where you can connect to
another device, which is also in the application’s Bluetooth submenu, selecting the
Connect BT device. After the connection has been established, both devices start the
game automatically in multiplayer mode.
• Options Activates the Options submenu, where you can select the control
method of the game (Control: Camera/Keyboard).
• About Displays information about the application.
• Quit Quits the application.
The game
After loading the track, an orange ball appears on it. In multiplayer mode, in the beginning,
you can see both players’ balls, at the same location. The camera always follows the ball that
is of the local player.
You can control the ball with the selected method, which you can change in the Options
menu.
Keyboard – Hold the up (or 2), the down (or 8), the right (or 6), or the left (or 4) buttons to
accelerate the ball in the desired direction. The ball keeps accelerating until it reaches its
maximum speed, or collides to a wall.
Camera - The control of the ball is done using the main camera of the device, utilizing an
image processing algorithm. Therefore be sure not to obscure the camera lens, and to provide
it with a bright and diversified image. The quality of the image feed for the image processing
algorithm is indicated by a blue horizontal line in the upper left corner of the screen. A short
line means that the required operating conditions for motion detection are not met, therefore
the ball won’t accelerate at all.
Tilting the device in either direction about 30 degrees from the starting position, the ball
begins to accelerate in the respective angle. The acceleration is not constant, it drops to zero
in about five seconds. Then this will be the new horizontal position for the device
The momentary position of the device can be set to horizontal by pressing the OK button (or 5).
The goal of the game is to drive the ball into the finish hole. After finishing a level, you can
return to the main menu by acknowledging the You win! message.
The game can be paused at any time by pressing the soft-key on the right-side. A menu
appears, from which you can return to the game by selecting Resume or quit to the main menu
by choosing Quit to main menu.
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