Motorola C450 ユーザーズマニュアル

 

GameScreen Class 

The 

GameScreen

 class provides the basis for a game user interface. In addition to the 

features inherited from MIDP's Canvas (commands, input events, etc.) The GameScreen 

class provides game-specific capabilities such as an off-screen buffer with synchronized 
flushing and key status polling. A game can provide its own thread to run the game loop. 
A typical loop will check for input, implement the game logic, and then render the updated 

user interface. 

GameScreen Fields 

The 

GameScreen

 class defines the following fields: 

• 

public static final int DOWN_KEY

 - The bit representing the DOWN 

key. This constant has a value of 0x02. 

• 

public static final int FIRE_KEY

 - The bit representing the FIRE key. 

This constant has a value of 0x10. 

• 

public static final int GAME_A_KEY

 - The bit representing the 

GAME_A key (may not be supported on all devices). This constant has a value of 

0x20. 

• 

public static final int GAME_B_KEY

 - The bit representing the 

GAME_B key (may not be supported on all devices). This constant has a value of 
0x40. 

• 

public static final int GAME_C_KEY

 - The bit representing the 

GAME_C key (may not be supported on all devices). This constant has a value of 
0x80. 

• 

public static final int GAME_D_KEY

 - The bit representing the 

GAME_D key (may not be supported on all devices). This constant has a value of 

0x100. 

• 

public static final int LEFT_KEY

 - The bit representing the LEFT key. 

This constant has a value of 0x04. 

• 

public static final int RIGHT_KEY

 

- The bit representing the RIGHT 

key. This constant has a value of 0x08. 

• 

public static final int UP_KEY

 - The bit representing the UP key. This 

constant has a value of 0x01. 

• 

public static final int PRIORITY_MAX

 - The maximum priority for 

playing sound effects. This constant has a value of 100. 

• 

public static final int PRIORITY_MIN

 - The minimum priority for 

playing sound effects. This constant has a value of 0. 

• 

public static final int VOLUME_MAX

 

- The maximum volume for 

playing sound effects. This constant has a value of 100.