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| A structure that contains joystick trackball motion event ,,structure,, ^information^ (event.jball.*). | A structure that contains joystick trackball motion event information. |
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| ||Uint8||'''which'''||the joystick device index ^*the index of the joystick that reported the event*^|| ||Uint8||'''ball'''||the joystick trackball index ^*the index of the trackball*^|| ||Uint8||'''padding1'''||^8 empty bits to total 32^???|| ||Uint8||'''padding2'''||^8 empty bits to total 32^???|| |
||Uint8||'''which'''||the index of the joystick that reported the event|| ||Uint8||'''ball'''||the index of the trackball that changed|| |
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| *<<BR>>[[SDL_JoyBallEvent]]() is a member of the [[SDL_Event]] union and is used when an event of type SDL_JOYBALLMOTION is reported. | [[SDL_JoyBallEvent]] is a member of the [[SDL_Event]] structure and is used when an event of type SDL_JOYBALLMOTION is reported. |
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| A SDL_JOYBALLMOTION event occurs when a user moves a trackball on the joystick. ,,The field '''which''' is the index of the joystick that reported the event and '''ball''' is the index of the trackball,, <<Color2(orange,(for a more detailed explanation see the Joystick section))>>. Trackballs only return relative motion, <<Color2(green,suggest a hyphen here instead of a comma)>> this is the change in position on the ball since it was last polled (last cycle of the event loop) <<Color2(green,suggest a hyphen here)>> and it is stored in '''xrel''' and '''yrel'''.<<BR>>* | An SDL_JOYBALLMOTION event occurs when a user moves a trackball on the joystick. Trackballs only return relative motion. This is the change in position of the ball since it was last polled (last cycle of the event loop). == Related Structures == .[[SDL_JoyAxisEvent]] .[[SDL_JoyButtonEvent]] .[[SDL_JoyHatEvent]] |
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SDL_JoyBallEvent
A structure that contains joystick trackball motion event information.
Data Fields
Uint32 |
type |
SDL_JOYBALLMOTION |
Uint8 |
which |
the index of the joystick that reported the event |
Uint8 |
ball |
the index of the trackball that changed |
int |
xrel |
the relative motion in the X direction |
int |
yrel |
the relative motion in the Y direction |
Code Examples
You can add your code example here
Remarks
SDL_JoyBallEvent is a member of the SDL_Event structure and is used when an event of type SDL_JOYBALLMOTION is reported.
An SDL_JOYBALLMOTION event occurs when a user moves a trackball on the joystick.
Trackballs only return relative motion. This is the change in position of the ball since it was last polled (last cycle of the event loop).
Related Structures
