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annotate docs/html/sdljoystickgetaxis.html @ 894:1d1a823904d8

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Don't crash if the stretch routines are used on hardware surfaces
author Sam Lantinga <slouken@libsdl.org>
date Sun, 16 May 2004 21:08:55 +0000
parents 355632dca928
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_JoystickGetAxis</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_JoystickUpdate"
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17 HREF="sdljoystickupdate.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_JoystickGetHat"
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20 HREF="sdljoystickgethat.html"></HEAD
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21 ><BODY
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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"
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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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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="sdljoystickupdate.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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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="sdljoystickgethat.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="SDLJOYSTICKGETAXIS"
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74 ></A
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75 >SDL_JoystickGetAxis</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="AEN6320"
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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_JoystickGetAxis&nbsp;--&nbsp;Get the current state of an axis</DIV
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84 ><DIV
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85 CLASS="REFSYNOPSISDIV"
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86 ><A
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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="AEN6324"
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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 >Sint16 <B
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106 CLASS="FSFUNC"
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107 >SDL_JoystickGetAxis</B
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108 ></CODE
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109 >(SDL_Joystick *joystick, int axis);</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="AEN6330"
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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 ><TT
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124 CLASS="FUNCTION"
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125 >SDL_JoystickGetAxis</TT
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126 > returns the current state of the given <TT
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127 CLASS="PARAMETER"
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128 ><I
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129 >axis</I
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130 ></TT
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131 > on the given <TT
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132 CLASS="PARAMETER"
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133 ><I
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134 >joystick</I
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135 ></TT
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136 >.</P
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137 ><P
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138 >On most modern joysticks the X axis is usually represented by <TT
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139 CLASS="PARAMETER"
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140 ><I
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141 >axis</I
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142 ></TT
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143 > 0 and the Y axis by <TT
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144 CLASS="PARAMETER"
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145 ><I
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146 >axis</I
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147 ></TT
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148 > 1. The value returned by <TT
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149 CLASS="FUNCTION"
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150 >SDL_JoystickGetAxis</TT
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151 > is a signed integer (-32768 to 32768) representing the current position of the <TT
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152 CLASS="PARAMETER"
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153 ><I
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154 >axis</I
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155 ></TT
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156 >, it maybe necessary to impose certain tolerances on these values to account for jitter. It is worth noting that some joysticks use axes 2 and 3 for extra buttons.</P
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157 ></DIV
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158 ><DIV
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159 CLASS="REFSECT1"
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160 ><A
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161 NAME="AEN6341"
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162 ></A
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163 ><H2
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164 >Return Value</H2
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165 ><P
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166 >Returns a 16-bit signed integer representing the current position of the <TT
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167 CLASS="PARAMETER"
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168 ><I
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169 >axis</I
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170 ></TT
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171 >.</P
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172 ></DIV
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173 ><DIV
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174 CLASS="REFSECT1"
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175 ><A
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176 NAME="AEN6345"
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177 ></A
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178 ><H2
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179 >Examples</H2
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180 ><P
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181 ><PRE
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182 CLASS="PROGRAMLISTING"
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183 >Sint16 x_move, y_move;
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184 SDL_Joystick *joy1;
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185 .
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186 .
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187 x_move=SDL_JoystickGetAxis(joy1, 0);
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188 y_move=SDL_JoystickGetAxis(joy1, 1);</PRE
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189 ></P
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190 ></DIV
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191 ><DIV
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192 CLASS="REFSECT1"
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193 ><A
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194 NAME="AEN6349"
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195 ></A
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196 ><H2
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197 >See Also</H2
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198 ><P
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199 ><A
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200 HREF="sdljoysticknumaxes.html"
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201 ><TT
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202 CLASS="FUNCTION"
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203 >SDL_JoystickNumAxes</TT
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204 ></A
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205 ></P
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206 ></DIV
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207 ><DIV
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208 CLASS="NAVFOOTER"
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209 ><HR
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210 ALIGN="LEFT"
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211 WIDTH="100%"><TABLE
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212 SUMMARY="Footer navigation table"
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213 WIDTH="100%"
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214 BORDER="0"
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215 CELLPADDING="0"
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216 CELLSPACING="0"
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217 ><TR
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218 ><TD
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219 WIDTH="33%"
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220 ALIGN="left"
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221 VALIGN="top"
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222 ><A
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223 HREF="sdljoystickupdate.html"
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224 ACCESSKEY="P"
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225 >Prev</A
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226 ></TD
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227 ><TD
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228 WIDTH="34%"
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229 ALIGN="center"
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230 VALIGN="top"
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231 ><A
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232 HREF="index.html"
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233 ACCESSKEY="H"
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234 >Home</A
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235 ></TD
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236 ><TD
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237 WIDTH="33%"
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238 ALIGN="right"
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239 VALIGN="top"
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240 ><A
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241 HREF="sdljoystickgethat.html"
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242 ACCESSKEY="N"
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243 >Next</A
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244 ></TD
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245 ></TR
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246 ><TR
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247 ><TD
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248 WIDTH="33%"
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249 ALIGN="left"
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250 VALIGN="top"
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251 >SDL_JoystickUpdate</TD
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252 ><TD
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253 WIDTH="34%"
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254 ALIGN="center"
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255 VALIGN="top"
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256 ><A
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257 HREF="joystick.html"
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258 ACCESSKEY="U"
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259 >Up</A
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260 ></TD
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261 ><TD
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262 WIDTH="33%"
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263 ALIGN="right"
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264 VALIGN="top"
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265 >SDL_JoystickGetHat</TD
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266 ></TR
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267 ></TABLE
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268 ></DIV
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269 ></BODY
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270 ></HTML
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271 >