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Test Your Knowledge in Computers #227
Difficulty: Easy
According to NetMarketShare, in September 2019 BSD had a 0.01% global market share of the desktop computing market.
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sdl_joystickgetball(3) [opensolaris man page]

SDL_JoystickGetBall(3)						 SDL API Reference					    SDL_JoystickGetBall(3)

NAME
SDL_JoystickGetBall - Get relative trackball motion SYNOPSIS
#include "SDL.h" int SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy); DESCRIPTION
Get the ball axis change. Trackballs can only return relative motion since the last call to SDL_JoystickGetBall, these motion deltas a placed into dx and dy. RETURN VALUE
Returns 0 on success or -1 on failure EXAMPLES
int delta_x, delta_y; SDL_Joystick *joy; . . . SDL_JoystickUpdate(); if(SDL_JoystickGetBall(joy, 0, &delta_x, &delta_y)==-1) printf("TrackBall Read Error! "); printf("Trackball Delta- X:%d, Y:%d ", delta_x, delta_y); SEE ALSO
SDL_JoystickNumBalls SDL
Tue 11 Sep 2001, 23:00 SDL_JoystickGetBall(3)

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