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4 >SDL_JoyBallEvent</TITLE |
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44 WIDTH="10%" |
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48 HREF="sdljoyhatevent.html" |
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50 >Prev</A |
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64 >Next</A |
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66 ></TR |
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67 ></TABLE |
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68 ><HR |
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69 ALIGN="LEFT" |
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70 WIDTH="100%"></DIV |
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71 ><H1 |
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72 ><A |
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73 NAME="SDLJOYBALLEVENT" |
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74 ></A |
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75 >SDL_JoyBallEvent</H1 |
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76 ><DIV |
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77 CLASS="REFNAMEDIV" |
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78 ><A |
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79 NAME="AEN4396" |
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80 ></A |
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81 ><H2 |
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82 >Name</H2 |
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83 >SDL_JoyBallEvent -- Joystick trackball motion event structure</DIV |
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84 ><DIV |
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85 CLASS="REFSECT1" |
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86 ><A |
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87 NAME="AEN4399" |
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88 ></A |
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89 ><H2 |
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90 >Structure Definition</H2 |
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91 ><PRE |
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92 CLASS="PROGRAMLISTING" |
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93 >typedef struct{ |
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94 Uint8 type; |
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95 Uint8 which; |
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96 Uint8 ball; |
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97 Sint16 xrel, yrel; |
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98 } SDL_JoyBallEvent;</PRE |
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99 ></DIV |
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100 ><DIV |
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101 CLASS="REFSECT1" |
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102 ><A |
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103 NAME="AEN4402" |
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104 ></A |
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105 ><H2 |
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106 >Structure Data</H2 |
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107 ><DIV |
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108 CLASS="INFORMALTABLE" |
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109 ><A |
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110 NAME="AEN4404" |
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111 ></A |
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112 ><P |
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113 ></P |
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114 ><TABLE |
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115 BORDER="0" |
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116 CLASS="CALSTABLE" |
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117 ><TBODY |
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118 ><TR |
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119 ><TD |
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120 ALIGN="LEFT" |
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121 VALIGN="TOP" |
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122 ><TT |
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123 CLASS="STRUCTFIELD" |
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124 ><I |
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125 >type</I |
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126 ></TT |
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127 ></TD |
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128 ><TD |
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129 ALIGN="LEFT" |
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130 VALIGN="TOP" |
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131 ><TT |
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132 CLASS="LITERAL" |
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133 >SDL_JOYBALLMOTION</TT |
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134 ></TD |
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135 ></TR |
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136 ><TR |
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137 ><TD |
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138 ALIGN="LEFT" |
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139 VALIGN="TOP" |
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140 ><TT |
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141 CLASS="STRUCTFIELD" |
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142 ><I |
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143 >which</I |
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144 ></TT |
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145 ></TD |
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146 ><TD |
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147 ALIGN="LEFT" |
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148 VALIGN="TOP" |
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149 >Joystick device index</TD |
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150 ></TR |
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151 ><TR |
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152 ><TD |
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153 ALIGN="LEFT" |
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154 VALIGN="TOP" |
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155 ><TT |
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156 CLASS="STRUCTFIELD" |
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157 ><I |
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158 >ball</I |
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159 ></TT |
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160 ></TD |
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161 ><TD |
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162 ALIGN="LEFT" |
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163 VALIGN="TOP" |
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164 >Joystick trackball index</TD |
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165 ></TR |
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166 ><TR |
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167 ><TD |
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168 ALIGN="LEFT" |
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169 VALIGN="TOP" |
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170 ><TT |
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171 CLASS="STRUCTFIELD" |
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172 ><I |
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173 >xrel</I |
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174 ></TT |
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175 >, <TT |
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176 CLASS="STRUCTFIELD" |
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177 ><I |
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178 >yrel</I |
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179 ></TT |
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180 ></TD |
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181 ><TD |
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182 ALIGN="LEFT" |
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183 VALIGN="TOP" |
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184 >The relative motion in the X/Y direction</TD |
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185 ></TR |
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186 ></TBODY |
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187 ></TABLE |
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188 ><P |
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189 ></P |
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190 ></DIV |
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191 ></DIV |
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192 ><DIV |
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193 CLASS="REFSECT1" |
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194 ><A |
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195 NAME="AEN4425" |
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196 ></A |
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197 ><H2 |
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198 >Description</H2 |
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199 ><P |
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200 ><SPAN |
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201 CLASS="STRUCTNAME" |
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202 >SDL_JoyBallEvent</SPAN |
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203 > is a member of the <A |
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204 HREF="sdlevent.html" |
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205 ><SPAN |
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206 CLASS="STRUCTNAME" |
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207 >SDL_Event</SPAN |
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208 ></A |
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209 > union and is used when an event of type <TT |
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210 CLASS="LITERAL" |
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211 >SDL_JOYBALLMOTION</TT |
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212 > is reported.</P |
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213 ><P |
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214 >A <TT |
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215 CLASS="LITERAL" |
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216 >SDL_JOYBALLMOTION</TT |
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217 > event occurs when a user moves a trackball on the joystick. The field <TT |
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218 CLASS="STRUCTFIELD" |
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219 ><I |
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220 >which</I |
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221 ></TT |
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222 > is the index of the joystick that reported the event and <TT |
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223 CLASS="STRUCTFIELD" |
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224 ><I |
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225 >ball</I |
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226 ></TT |
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227 > is the index of the trackball (for a more detailed explaination see the <A |
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228 HREF="joystick.html" |
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229 >Joystick section</A |
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230 >). Trackballs only return relative motion, this is the change in position on the ball since it was last polled (last cycle of the event loop) and it is stored in <TT |
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231 CLASS="STRUCTFIELD" |
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232 ><I |
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233 >xrel</I |
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234 ></TT |
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235 > and <TT |
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236 CLASS="STRUCTFIELD" |
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237 ><I |
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238 >yrel</I |
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239 ></TT |
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240 >.</P |
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241 ></DIV |
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242 ><DIV |
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243 CLASS="REFSECT1" |
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244 ><A |
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245 NAME="AEN4439" |
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246 ></A |
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247 ><H2 |
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248 >See Also</H2 |
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249 ><P |
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250 ><A |
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251 HREF="sdlevent.html" |
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252 ><SPAN |
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253 CLASS="STRUCTNAME" |
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254 >SDL_Event</SPAN |
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255 ></A |
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256 >, |
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257 <A |
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258 HREF="joystick.html" |
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259 >Joystick Functions</A |
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260 >, |
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261 <A |
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262 HREF="sdljoystickeventstate.html" |
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263 ><TT |
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264 CLASS="FUNCTION" |
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265 >SDL_JoystickEventState</TT |
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266 ></A |
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267 >, |
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268 <A |
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269 HREF="sdljoystickgetball.html" |
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270 ><TT |
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271 CLASS="FUNCTION" |
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272 >SDL_JoystickGetBall</TT |
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273 ></A |
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274 ></P |
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