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annotate docs/html/sdljoyballevent.html @ 2321:c5feceb0395e

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SetupWindowData in SDL_X11window.c was realloc()ing the display window list and incrementing numwindows even though those are being updated in functions that call this function. The result is that it is possible to get the same window added to the list twice.
author Bob Pendleton <bob@pendleton.com>
date Tue, 04 Mar 2008 23:09:28 +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_JoyBallEvent</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="SDL Event Structures."
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14 HREF="eventstructures.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="SDL_JoyHatEvent"
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17 HREF="sdljoyhatevent.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_ResizeEvent"
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20 HREF="sdlresizeevent.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"
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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="sdljoyhatevent.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="sdlresizeevent.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="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&nbsp;--&nbsp;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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275 ></DIV
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276 ><DIV
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277 CLASS="NAVFOOTER"
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278 ><HR
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279 ALIGN="LEFT"
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280 WIDTH="100%"><TABLE
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281 SUMMARY="Footer navigation table"
0
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282 WIDTH="100%"
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283 BORDER="0"
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284 CELLPADDING="0"
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285 CELLSPACING="0"
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286 ><TR
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287 ><TD
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288 WIDTH="33%"
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289 ALIGN="left"
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290 VALIGN="top"
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291 ><A
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292 HREF="sdljoyhatevent.html"
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293 ACCESSKEY="P"
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294 >Prev</A
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295 ></TD
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296 ><TD
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297 WIDTH="34%"
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298 ALIGN="center"
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299 VALIGN="top"
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300 ><A
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301 HREF="index.html"
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302 ACCESSKEY="H"
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303 >Home</A
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304 ></TD
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305 ><TD
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306 WIDTH="33%"
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307 ALIGN="right"
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308 VALIGN="top"
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309 ><A
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310 HREF="sdlresizeevent.html"
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311 ACCESSKEY="N"
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312 >Next</A
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313 ></TD
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314 ></TR
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315 ><TR
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316 ><TD
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317 WIDTH="33%"
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318 ALIGN="left"
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319 VALIGN="top"
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320 >SDL_JoyHatEvent</TD
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321 ><TD
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322 WIDTH="34%"
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323 ALIGN="center"
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324 VALIGN="top"
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325 ><A
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326 HREF="eventstructures.html"
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327 ACCESSKEY="U"
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328 >Up</A
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329 ></TD
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330 ><TD
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331 WIDTH="33%"
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332 ALIGN="right"
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333 VALIGN="top"
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334 >SDL_ResizeEvent</TD
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335 ></TR
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336 ></TABLE
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337 ></DIV
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338 ></BODY
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339 ></HTML
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340 >