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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 1.61
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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 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 ><TR
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36 ><TH
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37 COLSPAN="3"
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38 ALIGN="center"
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39 >SDL Library Documentation</TH
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40 ></TR
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41 ><TR
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42 ><TD
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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 ><A
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47 HREF="sdljoyhatevent.html"
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48 >Prev</A
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49 ></TD
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50 ><TD
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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 ></TD
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55 ><TD
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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 ><A
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60 HREF="sdlresizeevent.html"
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61 >Next</A
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62 ></TD
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63 ></TR
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64 ></TABLE
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65 ><HR
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66 ALIGN="LEFT"
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67 WIDTH="100%"></DIV
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68 ><H1
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69 ><A
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70 NAME="SDLJOYBALLEVENT"
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71 >SDL_JoyBallEvent</A
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72 ></H1
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73 ><DIV
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74 CLASS="REFNAMEDIV"
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75 ><A
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76 NAME="AEN3888"
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77 ></A
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78 ><H2
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79 >Name</H2
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80 >SDL_JoyBallEvent -- Joystick trackball motion event structure</DIV
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81 ><DIV
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82 CLASS="REFSECT1"
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83 ><A
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84 NAME="AEN3891"
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85 ></A
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86 ><H2
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87 >Structure Definition</H2
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88 ><PRE
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89 CLASS="PROGRAMLISTING"
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90 >typedef struct{
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91 Uint8 type;
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92 Uint8 which;
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93 Uint8 ball;
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94 Sint16 xrel, yrel;
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95 } SDL_JoyBallEvent;</PRE
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96 ></DIV
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97 ><DIV
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98 CLASS="REFSECT1"
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99 ><A
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100 NAME="AEN3894"
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101 ></A
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102 ><H2
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103 >Structure Data</H2
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104 ><DIV
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105 CLASS="INFORMALTABLE"
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106 ><A
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107 NAME="AEN3896"
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108 ></A
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109 ><P
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110 ></P
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111 ><TABLE
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112 BORDER="0"
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113 CLASS="CALSTABLE"
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114 ><TBODY
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115 ><TR
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116 ><TD
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117 ALIGN="LEFT"
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118 VALIGN="TOP"
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119 ><TT
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120 CLASS="STRUCTFIELD"
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121 ><I
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122 >type</I
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123 ></TT
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124 ></TD
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125 ><TD
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126 ALIGN="LEFT"
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127 VALIGN="TOP"
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128 ><TT
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129 CLASS="LITERAL"
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130 >SDL_JOYBALLMOTION</TT
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131 ></TD
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132 ></TR
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133 ><TR
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134 ><TD
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135 ALIGN="LEFT"
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136 VALIGN="TOP"
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137 ><TT
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138 CLASS="STRUCTFIELD"
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139 ><I
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140 >which</I
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141 ></TT
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142 ></TD
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143 ><TD
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144 ALIGN="LEFT"
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145 VALIGN="TOP"
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146 >Joystick device index</TD
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147 ></TR
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148 ><TR
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149 ><TD
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150 ALIGN="LEFT"
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151 VALIGN="TOP"
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152 ><TT
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153 CLASS="STRUCTFIELD"
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154 ><I
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155 >ball</I
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156 ></TT
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157 ></TD
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158 ><TD
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159 ALIGN="LEFT"
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160 VALIGN="TOP"
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161 >Joystick trackball index</TD
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162 ></TR
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163 ><TR
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164 ><TD
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165 ALIGN="LEFT"
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166 VALIGN="TOP"
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167 ><TT
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168 CLASS="STRUCTFIELD"
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169 ><I
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170 >xrel</I
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171 ></TT
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172 >, <TT
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173 CLASS="STRUCTFIELD"
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174 ><I
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175 >yrel</I
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176 ></TT
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177 ></TD
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178 ><TD
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179 ALIGN="LEFT"
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180 VALIGN="TOP"
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181 >The relative motion in the X/Y direction</TD
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182 ></TR
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183 ></TBODY
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184 ></TABLE
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185 ><P
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186 ></P
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187 ></DIV
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188 ></DIV
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189 ><DIV
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190 CLASS="REFSECT1"
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191 ><A
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192 NAME="AEN3917"
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193 ></A
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194 ><H2
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195 >Description</H2
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196 ><P
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197 ><SPAN
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198 CLASS="STRUCTNAME"
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199 >SDL_JoyBallEvent</SPAN
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200 > is a member of the <A
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201 HREF="sdlevent.html"
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202 ><SPAN
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203 CLASS="STRUCTNAME"
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204 >SDL_Event</SPAN
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205 ></A
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206 > union and is used when an event of type <TT
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207 CLASS="LITERAL"
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208 >SDL_JOYBALLMOTION</TT
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209 > is reported.</P
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210 ><P
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211 >A <TT
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212 CLASS="LITERAL"
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213 >SDL_JOYBALLMOTION</TT
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214 > event occurs when a user moves a trackball on the joystick. The field <TT
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215 CLASS="STRUCTFIELD"
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216 ><I
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217 >which</I
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218 ></TT
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219 > is the index of the joystick that reported the event and <TT
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220 CLASS="STRUCTFIELD"
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221 ><I
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222 >ball</I
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223 ></TT
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224 > is the index of the trackball (for a more detailed explaination see the <A
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225 HREF="joystick.html"
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226 >Joystick section</A
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227 >). 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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228 CLASS="STRUCTFIELD"
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229 ><I
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230 >xrel</I
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231 ></TT
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232 > and <TT
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233 CLASS="STRUCTFIELD"
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234 ><I
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235 >yrel</I
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236 ></TT
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237 >.</P
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238 ></DIV
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239 ><DIV
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240 CLASS="REFSECT1"
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241 ><A
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242 NAME="AEN3931"
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243 ></A
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244 ><H2
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245 >See Also</H2
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246 ><P
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247 ><A
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248 HREF="sdlevent.html"
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249 ><SPAN
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250 CLASS="STRUCTNAME"
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251 >SDL_Event</SPAN
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252 ></A
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253 >,
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254 <A
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255 HREF="joystick.html"
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256 >Joystick Functions</A
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257 >,
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258 <A
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259 HREF="sdljoystickeventstate.html"
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260 ><TT
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261 CLASS="FUNCTION"
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262 >SDL_JoystickEventState</TT
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263 ></A
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264 >,
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265 <A
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266 HREF="sdljoystickgetball.html"
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267 ><TT
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268 CLASS="FUNCTION"
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269 >SDL_JoystickGetBall</TT
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270 ></A
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271 ></P
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272 ></DIV
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273 ><DIV
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274 CLASS="NAVFOOTER"
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275 ><HR
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276 ALIGN="LEFT"
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277 WIDTH="100%"><TABLE
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278 WIDTH="100%"
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279 BORDER="0"
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280 CELLPADDING="0"
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281 CELLSPACING="0"
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282 ><TR
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283 ><TD
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284 WIDTH="33%"
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285 ALIGN="left"
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286 VALIGN="top"
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287 ><A
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288 HREF="sdljoyhatevent.html"
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289 >Prev</A
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290 ></TD
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291 ><TD
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292 WIDTH="34%"
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293 ALIGN="center"
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294 VALIGN="top"
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295 ><A
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296 HREF="index.html"
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297 >Home</A
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298 ></TD
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299 ><TD
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300 WIDTH="33%"
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301 ALIGN="right"
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302 VALIGN="top"
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303 ><A
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304 HREF="sdlresizeevent.html"
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305 >Next</A
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306 ></TD
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307 ></TR
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308 ><TR
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309 ><TD
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310 WIDTH="33%"
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311 ALIGN="left"
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312 VALIGN="top"
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313 >SDL_JoyHatEvent</TD
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314 ><TD
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315 WIDTH="34%"
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316 ALIGN="center"
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317 VALIGN="top"
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318 ><A
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319 HREF="eventstructures.html"
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320 >Up</A
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321 ></TD
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322 ><TD
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323 WIDTH="33%"
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324 ALIGN="right"
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325 VALIGN="top"
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326 >SDL_ResizeEvent</TD
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327 ></TR
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328 ></TABLE
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329 ></DIV
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330 ></BODY
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331 ></HTML
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332 > |
