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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 1.61
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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="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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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="sdljoystickupdate.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="sdljoystickgethat.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="SDLJOYSTICKGETAXIS"
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71 >SDL_JoystickGetAxis</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="AEN5698"
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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_JoystickGetAxis -- Get the current state of an axis</DIV
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81 ><DIV
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82 CLASS="REFSYNOPSISDIV"
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83 ><A
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84 NAME="AEN5701"
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85 ></A
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86 ><H2
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87 >Synopsis</H2
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88 ><DIV
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89 CLASS="FUNCSYNOPSIS"
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90 ><A
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91 NAME="AEN5702"
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92 ></A
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93 ><P
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94 ></P
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95 ><PRE
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96 CLASS="FUNCSYNOPSISINFO"
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97 >#include "SDL.h"</PRE
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98 ><P
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99 ><CODE
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100 ><CODE
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101 CLASS="FUNCDEF"
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102 >Sint16 <B
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103 CLASS="FSFUNC"
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104 >SDL_JoystickGetAxis</B
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105 ></CODE
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106 >(SDL_Joystick *joystick, int axis);</CODE
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107 ></P
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108 ><P
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109 ></P
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110 ></DIV
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111 ></DIV
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112 ><DIV
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113 CLASS="REFSECT1"
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114 ><A
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115 NAME="AEN5708"
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116 ></A
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117 ><H2
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118 >Description</H2
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119 ><P
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120 ><TT
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121 CLASS="FUNCTION"
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122 >SDL_JoystickGetAxis</TT
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123 > returns the current state of the given <TT
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124 CLASS="PARAMETER"
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125 ><I
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126 >axis</I
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127 ></TT
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128 > on the given <TT
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129 CLASS="PARAMETER"
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130 ><I
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131 >joystick</I
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132 ></TT
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133 >.</P
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134 ><P
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135 >On most modern joysticks the X axis is usually represented by <TT
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136 CLASS="PARAMETER"
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137 ><I
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138 >axis</I
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139 ></TT
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140 > 0 and the Y axis by <TT
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141 CLASS="PARAMETER"
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142 ><I
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143 >axis</I
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144 ></TT
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145 > 1. The value returned by <TT
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146 CLASS="FUNCTION"
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147 >SDL_JoystickGetAxis</TT
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148 > is a signed integer (-32768 to 32768) representing the current position of the <TT
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149 CLASS="PARAMETER"
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150 ><I
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151 >axis</I
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152 ></TT
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153 >, 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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154 ></DIV
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155 ><DIV
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156 CLASS="REFSECT1"
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157 ><A
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158 NAME="AEN5719"
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159 ></A
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160 ><H2
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161 >Return Value</H2
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162 ><P
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163 >Returns a 16-bit signed integer representing the current position of the <TT
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164 CLASS="PARAMETER"
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165 ><I
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166 >axis</I
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167 ></TT
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168 >.</P
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169 ></DIV
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170 ><DIV
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171 CLASS="REFSECT1"
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172 ><A
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173 NAME="AEN5723"
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174 ></A
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175 ><H2
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176 >Examples</H2
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177 ><P
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178 ><PRE
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179 CLASS="PROGRAMLISTING"
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180 >Sint16 x_move, y_move;
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181 SDL_Joystick *joy1;
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182 .
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183 .
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184 x_move=SDL_JoystickGetAxis(joy1, 0);
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185 y_move=SDL_JoystickGetAxis(joy1, 1);</PRE
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186 ></P
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187 ></DIV
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188 ><DIV
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189 CLASS="REFSECT1"
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190 ><A
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191 NAME="AEN5727"
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192 ></A
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193 ><H2
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194 >See Also</H2
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195 ><P
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196 ><A
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197 HREF="sdljoysticknumaxes.html"
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198 ><TT
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199 CLASS="FUNCTION"
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200 >SDL_JoystickNumAxes</TT
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201 ></A
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202 ></P
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203 ></DIV
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204 ><DIV
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205 CLASS="NAVFOOTER"
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206 ><HR
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207 ALIGN="LEFT"
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208 WIDTH="100%"><TABLE
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209 WIDTH="100%"
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210 BORDER="0"
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211 CELLPADDING="0"
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212 CELLSPACING="0"
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213 ><TR
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214 ><TD
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215 WIDTH="33%"
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216 ALIGN="left"
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217 VALIGN="top"
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218 ><A
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219 HREF="sdljoystickupdate.html"
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220 >Prev</A
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221 ></TD
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222 ><TD
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223 WIDTH="34%"
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224 ALIGN="center"
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225 VALIGN="top"
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226 ><A
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227 HREF="index.html"
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228 >Home</A
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229 ></TD
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230 ><TD
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231 WIDTH="33%"
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232 ALIGN="right"
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233 VALIGN="top"
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234 ><A
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235 HREF="sdljoystickgethat.html"
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236 >Next</A
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237 ></TD
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238 ></TR
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239 ><TR
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240 ><TD
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241 WIDTH="33%"
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242 ALIGN="left"
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243 VALIGN="top"
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244 >SDL_JoystickUpdate</TD
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245 ><TD
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246 WIDTH="34%"
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247 ALIGN="center"
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248 VALIGN="top"
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249 ><A
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250 HREF="joystick.html"
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251 >Up</A
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252 ></TD
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253 ><TD
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254 WIDTH="33%"
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255 ALIGN="right"
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256 VALIGN="top"
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257 >SDL_JoystickGetHat</TD
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258 ></TR
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259 ></TABLE
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260 ></DIV
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261 ></BODY
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262 ></HTML
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263 > |
