User%20Interface

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User Interface

• Dr. Scott Schaefer

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User Interface

• Make it simple/easy to do common tasks
• Dont obscure the FOV
• Simpler is typically better
• Consistency is important!

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Diablo
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Warcraft 3
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World of Warcraft
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Quake 3
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Quake 4
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Madden 09
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Game Control

• Must consider single/multi-player aspect
• Single player?
• Networked multi-player?
• Multi-player same machine?
• Platform limitations

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Game Control Keyboard/Mouse

• Connected to every PC but lacking on most other
  platforms
• Fine for single player or
• multi-player networked
• Lots of buttons!

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Game Control Joystick

• Found on most consoles
• Can also be connect to
• PC via USB
• Win NT supports 2 joysticks
• Later versions support 16 joysticks

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Game Control Others
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Joystick Programming with Win32

• include ltwindows.hgt
• include ltmmsystem.hgt
• int joyGetNumDevs ( void )
• Returns number of joysticks supported by driver
  (not number connected to machine)

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Joystick Programming with Win32

• MMResult joyGetDevCaps ( int id, JOYCAPS cap,
  int size )
• id id of the joystick being tested (-1 through
  15)
• cap pointer to a JOYCAP structure
• size size of structure pointed to by cap
• Returns JOYERR_NOERROR if no error

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Joystick Programming with Win32

• typedef struct
• short wMid
• short wPid
• char szPnameMAXPNAMELEN
• unsigned int wXmin, wXmax, wYmin, wYmax, wZmin,
  wZmax
• unsigned int wNumButtons
• unsigned int wPeriodMin, wPeriodMax
• unsigned int wRmin, wRmax, wUmin, wUmax, wVmin,
  wVmax
• unsigned int wCaps
• unsigned int wMaxAxes
• unsigned int wNumAxes
• unsigned int wMaxButtons
• char szRegKeyMAXPNAMELEN
• char szOEMVxDMAX_JOYSTICKOEMVXDNAME
• JOYCAPS

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Joystick Programming with Win32

• typedef struct
• short wMid
• short wPid
• char szPnameMAXPNAMELEN
• unsigned int wXmin, wXmax, wYmin, wYmax, wZmin,
  wZmax
• unsigned int wNumButtons
• unsigned int wPeriodMin, wPeriodMax
• unsigned int wRmin, wRmax, wUmin, wUmax, wVmin,
  wVmax
• unsigned int wCaps
• unsigned int wMaxAxes
• unsigned int wNumAxes
• unsigned int wMaxButtons
• char szRegKeyMAXPNAMELEN
• char szOEMVxDMAX_JOYSTICKOEMVXDNAME
• JOYCAPS

number of buttons
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Joystick Programming with Win32

• typedef struct
• short wMid
• short wPid
• char szPnameMAXPNAMELEN
• unsigned int wXmin, wXmax, wYmin, wYmax, wZmin,
  wZmax
• unsigned int wNumButtons
• unsigned int wPeriodMin, wPeriodMax
• unsigned int wRmin, wRmax, wUmin, wUmax, wVmin,
  wVmax
• unsigned int wCaps
• unsigned int wMaxAxes
• unsigned int wNumAxes
• unsigned int wMaxButtons
• char szRegKeyMAXPNAMELEN
• char szOEMVxDMAX_JOYSTICKOEMVXDNAME
• JOYCAPS

min/max bounds for hat controllers
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Joystick Programming with Win32

• MMResult joyGetPosEx ( int id, JOYINFOEX info)
• id id of the joystick being tested (-1 through
  15)
• info pointer to a JOYINFOEX structure
• Returns JOYERR_NOERROR if no error
• JOYERR_UNPLUGGED if joystick not connected

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Joystick Programming with Win32

• typedef struct
• int dwSize
• int dwFlags
• int dwXpos, dwYpos, dwZpos
• int dwRpos, dwUpos, dwVpos
• int dwButtons
• int dwButtonNumber
• int dwPOV
• int dwReserved1
• int dwReserved2
• JOYINFOEX

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Joystick Programming with Win32

• typedef struct
• int dwSize
• int dwFlags
• int dwXpos, dwYpos, dwZpos
• int dwRpos, dwUpos, dwVpos
• int dwButtons
• int dwButtonNumber
• int dwPOV
• int dwReserved1
• int dwReserved2
• JOYINFOEX

MUST be sizeof( JOYINFOEX)
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Joystick Programming with Win32

• typedef struct
• int dwSize
• int dwFlags
• int dwXpos, dwYpos, dwZpos
• int dwRpos, dwUpos, dwVpos
• int dwButtons
• int dwButtonNumber
• int dwPOV
• int dwReserved1
• int dwReserved2
• JOYINFOEX

SHOULD be JOY_RETURNALL
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Joystick Programming with Win32

• typedef struct
• int dwSize
• int dwFlags
• int dwXpos, dwYpos, dwZpos
• int dwRpos, dwUpos, dwVpos
• int dwButtons
• int dwButtonNumber
• int dwPOV
• int dwReserved1
• int dwReserved2
• JOYINFOEX

position of hat controllers
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Joystick Programming with Win32

• typedef struct
• int dwSize
• int dwFlags
• int dwXpos, dwYpos, dwZpos
• int dwRpos, dwUpos, dwVpos
• int dwButtons
• int dwButtonNumber
• int dwPOV
• int dwReserved1
• int dwReserved2
• JOYINFOEX

bit array with bit set if button currently
pressed
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Joystick Programming with Win32

• typedef struct
• int dwSize
• int dwFlags
• int dwXpos, dwYpos, dwZpos
• int dwRpos, dwUpos, dwVpos
• int dwButtons
• int dwButtonNumber
• int dwPOV
• int dwReserved1
• int dwReserved2
• JOYINFOEX

number of buttons pressed
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Joystick Programming with Win32

• typedef struct
• int dwSize
• int dwFlags
• int dwXpos, dwYpos, dwZpos
• int dwRpos, dwUpos, dwVpos
• int dwButtons
• int dwButtonNumber
• int dwPOV
• int dwReserved1
• int dwReserved2
• JOYINFOEX

angle of POV controller