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- <title>"SDL_JoystickGetBall"("3") manual page</title>
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- <a href='#toc'>Table of Contents</a><p>
-
- <h2><a name='sect0' href='#toc0'>Name</a></h2>
- SDL_JoystickGetBall- Get relative trackball motion
- <h2><a name='sect1' href='#toc1'>Synopsis</a></h2>
- <p>
- <b>#include
- "SDL.h" <p>
- </b><b>int <b>SDL_JoystickGetBall</b></b>(<b>SDL_Joystick *joystick, int ball, int *dx,
- int *dy</b>);
- <h2><a name='sect2' href='#toc2'>Description</a></h2>
- <p>
- Get the <b>ball</b> axis change. <p>
- Trackballs can only return
- relative motion since the last call to <b>SDL_JoystickGetBall</b>, these motion
- deltas a placed into <b>dx</b> and <b>dy</b>.
- <h2><a name='sect3' href='#toc3'>Return Value</a></h2>
- <p>
- Returns <b>0</b> on success or <b>-1</b> on
- failure
- <h2><a name='sect4' href='#toc4'>Examples</a></h2>
- <p>
- <p>
- <br>
- <pre>CWint 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);
- </pre><p>
-
- <h2><a name='sect5' href='#toc5'>See Also</a></h2>
- <p>
- <i><b>SDL_JoystickNumBalls</b></i>
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- <a name='toc'><b>Table of Contents</b></a><p>
- <ul>
- <li><a name='toc0' href='#sect0'>Name</a></li>
- <li><a name='toc1' href='#sect1'>Synopsis</a></li>
- <li><a name='toc2' href='#sect2'>Description</a></li>
- <li><a name='toc3' href='#sect3'>Return Value</a></li>
- <li><a name='toc4' href='#sect4'>Examples</a></li>
- <li><a name='toc5' href='#sect5'>See Also</a></li>
- </ul>
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