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annotate docs/html/sdljoystickgetball.html @ 2328:91e601d9df8b

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re: bug#563. checking in some commented out trace code and a fix so that the in testalpha.c the background only flashes when alpha == 255. The problem that is being fixed is caused by clearing SDL_COPY_RLE_COLORKEY without setting SDL_COPY_RLE_DESIRED in SDL_UnRELSurface.
author Bob Pendleton <bob@pendleton.com>
date Fri, 14 Mar 2008 18:17:49 +0000
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children
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_JoystickGetBall</TITLE
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5 ><META
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6 NAME="GENERATOR"
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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8 "><LINK
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9 REL="HOME"
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10 TITLE="SDL Library Documentation"
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11 HREF="index.html"><LINK
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12 REL="UP"
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13 TITLE="Joystick"
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14 HREF="joystick.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="SDL_JoystickGetButton"
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17 HREF="sdljoystickgetbutton.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_JoystickClose"
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20 HREF="sdljoystickclose.html"></HEAD
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21 ><BODY
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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 ><DIV
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29 CLASS="NAVHEADER"
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30 ><TABLE
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31 SUMMARY="Header navigation table"
0
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32 WIDTH="100%"
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33 BORDER="0"
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34 CELLPADDING="0"
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35 CELLSPACING="0"
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36 ><TR
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37 ><TH
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38 COLSPAN="3"
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39 ALIGN="center"
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40 >SDL Library Documentation</TH
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41 ></TR
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42 ><TR
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43 ><TD
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44 WIDTH="10%"
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45 ALIGN="left"
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46 VALIGN="bottom"
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47 ><A
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48 HREF="sdljoystickgetbutton.html"
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49 ACCESSKEY="P"
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50 >Prev</A
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51 ></TD
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52 ><TD
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53 WIDTH="80%"
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54 ALIGN="center"
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55 VALIGN="bottom"
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56 ></TD
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57 ><TD
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58 WIDTH="10%"
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59 ALIGN="right"
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60 VALIGN="bottom"
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61 ><A
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62 HREF="sdljoystickclose.html"
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63 ACCESSKEY="N"
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64 >Next</A
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65 ></TD
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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="SDLJOYSTICKGETBALL"
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74 ></A
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75 >SDL_JoystickGetBall</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="AEN6433"
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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_JoystickGetBall&nbsp;--&nbsp;Get relative trackball motion</DIV
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84 ><DIV
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85 CLASS="REFSYNOPSISDIV"
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86 ><A
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87 NAME="AEN6436"
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88 ></A
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89 ><H2
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90 >Synopsis</H2
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91 ><DIV
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92 CLASS="FUNCSYNOPSIS"
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93 ><A
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94 NAME="AEN6437"
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95 ></A
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96 ><P
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97 ></P
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98 ><PRE
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99 CLASS="FUNCSYNOPSISINFO"
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100 >#include "SDL.h"</PRE
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101 ><P
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102 ><CODE
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103 ><CODE
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104 CLASS="FUNCDEF"
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105 >int <B
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106 CLASS="FSFUNC"
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107 >SDL_JoystickGetBall</B
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108 ></CODE
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109 >(SDL_Joystick *joystick, int ball, int *dx, int *dy);</CODE
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110 ></P
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111 ><P
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112 ></P
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113 ></DIV
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114 ></DIV
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115 ><DIV
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116 CLASS="REFSECT1"
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117 ><A
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118 NAME="AEN6443"
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119 ></A
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120 ><H2
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121 >Description</H2
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122 ><P
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123 >Get the <TT
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124 CLASS="PARAMETER"
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125 ><I
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126 >ball</I
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127 ></TT
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128 > axis change.</P
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129 ><P
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130 >Trackballs can only return relative motion since the last call to <TT
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131 CLASS="FUNCTION"
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132 >SDL_JoystickGetBall</TT
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133 >, these motion deltas a placed into <TT
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134 CLASS="PARAMETER"
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135 ><I
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136 >dx</I
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137 ></TT
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138 > and <TT
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139 CLASS="PARAMETER"
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140 ><I
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141 >dy</I
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142 ></TT
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143 >.</P
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144 ></DIV
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145 ><DIV
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146 CLASS="REFSECT1"
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147 ><A
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148 NAME="AEN6451"
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149 ></A
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150 ><H2
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151 >Return Value</H2
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152 ><P
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153 >Returns <SPAN
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154 CLASS="RETURNVALUE"
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155 >0</SPAN
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156 > on success or <SPAN
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157 CLASS="RETURNVALUE"
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158 >-1</SPAN
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159 > on failure</P
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160 ></DIV
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161 ><DIV
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162 CLASS="REFSECT1"
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163 ><A
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164 NAME="AEN6456"
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165 ></A
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166 ><H2
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167 >Examples</H2
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168 ><P
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169 ><PRE
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170 CLASS="PROGRAMLISTING"
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171 >int delta_x, delta_y;
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172 SDL_Joystick *joy;
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173 .
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174 .
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175 .
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176 SDL_JoystickUpdate();
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177 if(SDL_JoystickGetBall(joy, 0, &#38;delta_x, &#38;delta_y)==-1)
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178 printf("TrackBall Read Error!\n");
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179 printf("Trackball Delta- X:%d, Y:%d\n", delta_x, delta_y);</PRE
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180 ></P
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181 ></DIV
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182 ><DIV
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183 CLASS="REFSECT1"
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184 ><A
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185 NAME="AEN6460"
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186 ></A
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187 ><H2
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188 >See Also</H2
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189 ><P
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190 ><A
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191 HREF="sdljoysticknumballs.html"
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192 ><TT
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193 CLASS="FUNCTION"
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194 >SDL_JoystickNumBalls</TT
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195 ></A
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196 ></P
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197 ></DIV
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198 ><DIV
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199 CLASS="NAVFOOTER"
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200 ><HR
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201 ALIGN="LEFT"
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202 WIDTH="100%"><TABLE
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203 SUMMARY="Footer navigation table"
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204 WIDTH="100%"
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205 BORDER="0"
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206 CELLPADDING="0"
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207 CELLSPACING="0"
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208 ><TR
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209 ><TD
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210 WIDTH="33%"
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211 ALIGN="left"
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212 VALIGN="top"
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213 ><A
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214 HREF="sdljoystickgetbutton.html"
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215 ACCESSKEY="P"
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216 >Prev</A
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217 ></TD
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218 ><TD
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219 WIDTH="34%"
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220 ALIGN="center"
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221 VALIGN="top"
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222 ><A
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223 HREF="index.html"
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224 ACCESSKEY="H"
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225 >Home</A
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226 ></TD
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227 ><TD
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228 WIDTH="33%"
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229 ALIGN="right"
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230 VALIGN="top"
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231 ><A
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232 HREF="sdljoystickclose.html"
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233 ACCESSKEY="N"
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234 >Next</A
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235 ></TD
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236 ></TR
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237 ><TR
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238 ><TD
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239 WIDTH="33%"
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240 ALIGN="left"
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241 VALIGN="top"
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242 >SDL_JoystickGetButton</TD
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243 ><TD
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244 WIDTH="34%"
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245 ALIGN="center"
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246 VALIGN="top"
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247 ><A
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248 HREF="joystick.html"
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249 ACCESSKEY="U"
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250 >Up</A
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251 ></TD
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252 ><TD
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253 WIDTH="33%"
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254 ALIGN="right"
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255 VALIGN="top"
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256 >SDL_JoystickClose</TD
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257 ></TR
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258 ></TABLE
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259 ></DIV
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260 ></BODY
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261 ></HTML
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262 >