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| 5131 | clevermous | 1 | |
| 2 | > |
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| 3 | > |
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| 4 | >SDL_JoystickGetBall |
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| 5 | > |
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| 6 | NAME="GENERATOR" |
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| 7 | CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
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| 8 | "> |
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| 9 | REL="HOME" |
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| 10 | TITLE="SDL Library Documentation" |
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| 11 | HREF="index.html"> |
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| 12 | REL="UP" |
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| 13 | TITLE="Joystick" |
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| 14 | HREF="joystick.html"> |
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| 15 | REL="PREVIOUS" |
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| 16 | TITLE="SDL_JoystickGetButton" |
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| 17 | HREF="sdljoystickgetbutton.html"> |
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| 18 | REL="NEXT" |
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| 19 | TITLE="SDL_JoystickClose" |
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| 20 | HREF="sdljoystickclose.html"> |
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| 21 | > |
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| 22 | CLASS="REFENTRY" |
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| 23 | BGCOLOR="#FFF8DC" |
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| 24 | TEXT="#000000" |
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| 25 | LINK="#0000ee" |
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| 26 | VLINK="#551a8b" |
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| 27 | ALINK="#ff0000" |
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| 28 | > |
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| 29 | CLASS="NAVHEADER" |
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| 30 | > |
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| 31 | WIDTH="100%" |
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| 32 | BORDER="0" |
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| 33 | CELLPADDING="0" |
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| 34 | CELLSPACING="0" |
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| 35 | > |
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| 36 | > |
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| 37 | COLSPAN="3" |
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| 38 | ALIGN="center" |
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| 39 | >SDL Library Documentation |
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| 40 | > |
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| 41 | > |
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| 42 | > |
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| 43 | WIDTH="10%" |
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| 44 | ALIGN="left" |
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| 45 | VALIGN="bottom" |
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| 46 | > |
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| 47 | HREF="sdljoystickgetbutton.html" |
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| 48 | >Prev |
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| 49 | > |
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| 50 | > |
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| 51 | WIDTH="80%" |
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| 52 | ALIGN="center" |
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| 53 | VALIGN="bottom" |
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| 54 | > |
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| 55 | > |
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| 56 | WIDTH="10%" |
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| 57 | ALIGN="right" |
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| 58 | VALIGN="bottom" |
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| 59 | > |
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| 60 | HREF="sdljoystickclose.html" |
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| 61 | >Next |
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| 62 | > |
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| 63 | > |
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| 64 | > |
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| 65 | > |
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| 66 | ALIGN="LEFT" |
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| 67 | WIDTH="100%"> |
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| 68 | > |
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| 69 | > |
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| 70 | NAME="SDLJOYSTICKGETBALL" |
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| 71 | >SDL_JoystickGetBall |
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| 72 | > |
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| 73 | > |
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| 74 | CLASS="REFNAMEDIV" |
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| 75 | > |
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| 76 | NAME="AEN5886" |
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| 77 | > |
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| 78 | > |
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| 79 | >Name |
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| 80 | >SDL_JoystickGetBall -- Get relative trackball motion |
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| 81 | > |
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| 82 | CLASS="REFSYNOPSISDIV" |
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| 83 | > |
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| 84 | NAME="AEN5889" |
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| 85 | > |
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| 86 | > |
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| 87 | >Synopsis |
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| 88 | > |
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| 89 | CLASS="FUNCSYNOPSIS" |
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| 90 | > |
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| 91 | NAME="AEN5890" |
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| 92 | > |
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| 93 | > |
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| 94 | > |
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| 95 | > |
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| 96 | CLASS="FUNCSYNOPSISINFO" |
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| 97 | >#include "SDL.h" |
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| 98 | > |
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| 99 | > |
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| 100 | > |
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| 101 | CLASS="FUNCDEF" |
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| 102 | >int |
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| 103 | CLASS="FSFUNC" |
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| 104 | >SDL_JoystickGetBall |
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| 105 | > |
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| 106 | >(SDL_Joystick *joystick, int ball, int *dx, int *dy); |
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| 107 | > |
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| 108 | > |
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| 109 | > |
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| 110 | > |
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| 111 | > |
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| 112 | > |
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| 113 | CLASS="REFSECT1" |
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| 114 | > |
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| 115 | NAME="AEN5896" |
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| 116 | > |
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| 117 | > |
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| 118 | >Description |
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| 119 | > |
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| 120 | >Get the |
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| 121 | CLASS="PARAMETER" |
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| 122 | > |
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| 123 | >ball |
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| 124 | > |
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| 125 | > axis change. |
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| 126 | > |
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| 127 | >Trackballs can only return relative motion since the last call to |
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| 128 | CLASS="FUNCTION" |
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| 129 | >SDL_JoystickGetBall |
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| 130 | >, these motion deltas a placed into |
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| 131 | CLASS="PARAMETER" |
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| 132 | > |
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| 133 | >dx |
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| 134 | > |
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| 135 | > and |
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| 136 | CLASS="PARAMETER" |
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| 137 | > |
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| 138 | >dy |
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| 139 | > |
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| 140 | >. |
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| 141 | > |
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| 142 | > |
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| 143 | CLASS="REFSECT1" |
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| 144 | > |
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| 145 | NAME="AEN5904" |
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| 146 | > |
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| 147 | > |
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| 148 | >Return Value |
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| 149 | > |
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| 150 | >Returns |
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| 151 | CLASS="RETURNVALUE" |
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| 152 | >0 |
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| 153 | > on success or |
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| 154 | CLASS="RETURNVALUE" |
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| 155 | >-1 |
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| 156 | > on failure |
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| 157 | > |
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| 158 | > |
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| 159 | CLASS="REFSECT1" |
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| 160 | > |
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| 161 | NAME="AEN5909" |
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| 162 | > |
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| 163 | > |
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| 164 | >Examples |
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| 165 | > |
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| 166 | > |
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| 167 | CLASS="PROGRAMLISTING" |
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| 168 | >int delta_x, delta_y; |
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| 169 | SDL_Joystick *joy; |
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| 170 | . |
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| 171 | . |
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| 172 | . |
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| 173 | SDL_JoystickUpdate(); |
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| 174 | if(SDL_JoystickGetBall(joy, 0, &delta_x, &delta_y)==-1) |
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| 175 | printf("TrackBall Read Error!\n"); |
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| 176 | printf("Trackball Delta- X:%d, Y:%d\n", delta_x, delta_y); |
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| 177 | > |
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| 178 | > |
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| 179 | > |
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| 180 | CLASS="REFSECT1" |
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| 181 | > |
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| 182 | NAME="AEN5913" |
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| 183 | > |
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| 184 | > |
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| 185 | >See Also |
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| 186 | > |
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| 187 | > |
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| 188 | HREF="sdljoysticknumballs.html" |
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| 189 | > |
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| 190 | CLASS="FUNCTION" |
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| 191 | >SDL_JoystickNumBalls |
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| 192 | > |
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| 193 | > |
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| 194 | > |
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| 195 | > |
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| 196 | CLASS="NAVFOOTER" |
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| 197 | > |
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| 198 | ALIGN="LEFT" |
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| 199 | WIDTH="100%"> |
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| 200 | WIDTH="100%" |
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| 201 | BORDER="0" |
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| 202 | CELLPADDING="0" |
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| 203 | CELLSPACING="0" |
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| 204 | > |
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| 205 | > |
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| 206 | WIDTH="33%" |
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| 207 | ALIGN="left" |
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| 208 | VALIGN="top" |
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| 209 | > |
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| 210 | HREF="sdljoystickgetbutton.html" |
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| 211 | >Prev |
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| 212 | > |
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| 213 | > |
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| 214 | WIDTH="34%" |
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| 215 | ALIGN="center" |
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| 216 | VALIGN="top" |
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| 217 | > |
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| 218 | HREF="index.html" |
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| 219 | >Home |
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| 220 | > |
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| 221 | > |
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| 222 | WIDTH="33%" |
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| 223 | ALIGN="right" |
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| 224 | VALIGN="top" |
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| 225 | > |
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| 226 | HREF="sdljoystickclose.html" |
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| 227 | >Next |
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| 228 | > |
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| 229 | > |
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| 230 | > |
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| 231 | > |
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| 232 | WIDTH="33%" |
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| 233 | ALIGN="left" |
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| 234 | VALIGN="top" |
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| 235 | >SDL_JoystickGetButton |
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| 236 | > |
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| 237 | WIDTH="34%" |
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| 238 | ALIGN="center" |
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| 239 | VALIGN="top" |
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| 240 | > |
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| 241 | HREF="joystick.html" |
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| 242 | >Up |
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| 243 | > |
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| 244 | > |
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| 245 | WIDTH="33%" |
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| 246 | ALIGN="right" |
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| 247 | VALIGN="top" |
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| 248 | >SDL_JoystickClose |
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| 249 | > |
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| 250 | > |
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| 251 | > |
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| 252 | > |
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| 253 | > |
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| 254 | > |