>SDL_JoystickGetBall<
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>SDL Library Documentation<
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NAME="SDLJOYSTICKGETBALL"
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>SDL_JoystickGetBall -- Get relative trackball motion<
/DIV
CLASS="REFSYNOPSISDIV"
NAME="AEN5889"
CLASS="FUNCSYNOPSIS"
NAME="AEN5890"
CLASS="FUNCSYNOPSISINFO"
CLASS="FUNCDEF"
CLASS="FSFUNC"
>
(SDL_Joystick *joystick, int ball, int *dx, int *dy
);<
/CODE
CLASS="REFSECT1"
NAME="AEN5896"
CLASS="PARAMETER"
>Trackballs can only return relative motion since the last call to <
TT
CLASS="FUNCTION"
>, these motion deltas a placed into <
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CLASS="PARAMETER"
CLASS="PARAMETER"
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>int delta_x, delta_y;
SDL_Joystick *joy;
.
.
.
SDL_JoystickUpdate();
if(SDL_JoystickGetBall(joy, 0, &delta_x, &delta_y)==-1)
printf("TrackBall Read Error!\n");
printf
("Trackball Delta- X:%d, Y:%d\n", delta_x, delta_y
);<
/PRE
CLASS="REFSECT1"
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HREF="sdljoysticknumballs.html"
CLASS="FUNCTION"
>SDL_JoystickNumBalls<
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>SDL_JoystickGetButton<
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>