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271 lines
3.7 KiB
271 lines
3.7 KiB
<HTML |
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>SDL_JoystickGetAxis</TITLE |
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TITLE="SDL Library Documentation" |
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TITLE="Joystick" |
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TITLE="SDL_JoystickUpdate" |
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TITLE="SDL_JoystickGetHat" |
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>SDL Library Documentation</TH |
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><H1 |
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><A |
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NAME="SDLJOYSTICKGETAXIS" |
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></A |
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>SDL_JoystickGetAxis</H1 |
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><DIV |
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CLASS="REFNAMEDIV" |
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><A |
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NAME="AEN6320" |
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></A |
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><H2 |
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>Name</H2 |
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>SDL_JoystickGetAxis -- Get the current state of an axis</DIV |
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><DIV |
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CLASS="REFSYNOPSISDIV" |
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><A |
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NAME="AEN6323" |
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></A |
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><H2 |
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>Synopsis</H2 |
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><DIV |
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CLASS="FUNCSYNOPSIS" |
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><A |
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NAME="AEN6324" |
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></A |
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><P |
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></P |
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><PRE |
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CLASS="FUNCSYNOPSISINFO" |
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>#include "SDL.h"</PRE |
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><P |
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><CODE |
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><CODE |
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CLASS="FUNCDEF" |
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>Sint16 <B |
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CLASS="FSFUNC" |
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>SDL_JoystickGetAxis</B |
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></CODE |
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>(SDL_Joystick *joystick, int axis);</CODE |
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></P |
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><P |
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></P |
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><DIV |
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CLASS="REFSECT1" |
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><A |
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NAME="AEN6330" |
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></A |
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><H2 |
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>Description</H2 |
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><P |
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><TT |
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CLASS="FUNCTION" |
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>SDL_JoystickGetAxis</TT |
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> returns the current state of the given <TT |
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CLASS="PARAMETER" |
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><I |
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>axis</I |
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></TT |
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> on the given <TT |
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CLASS="PARAMETER" |
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><I |
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>joystick</I |
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></TT |
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>.</P |
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><P |
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>On most modern joysticks the X axis is usually represented by <TT |
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CLASS="PARAMETER" |
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><I |
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>axis</I |
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></TT |
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> 0 and the Y axis by <TT |
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CLASS="PARAMETER" |
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><I |
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>axis</I |
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></TT |
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> 1. The value returned by <TT |
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CLASS="FUNCTION" |
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>SDL_JoystickGetAxis</TT |
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> is a signed integer (-32768 to 32768) representing the current position of the <TT |
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CLASS="PARAMETER" |
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><I |
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>axis</I |
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></TT |
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>, 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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></DIV |
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><DIV |
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CLASS="REFSECT1" |
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><A |
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NAME="AEN6341" |
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></A |
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><H2 |
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>Return Value</H2 |
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><P |
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>Returns a 16-bit signed integer representing the current position of the <TT |
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CLASS="PARAMETER" |
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><I |
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>axis</I |
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></TT |
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>.</P |
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></DIV |
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><DIV |
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CLASS="REFSECT1" |
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><A |
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NAME="AEN6345" |
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></A |
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><H2 |
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>Examples</H2 |
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><P |
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><PRE |
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CLASS="PROGRAMLISTING" |
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>Sint16 x_move, y_move; |
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SDL_Joystick *joy1; |
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. |
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. |
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x_move=SDL_JoystickGetAxis(joy1, 0); |
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y_move=SDL_JoystickGetAxis(joy1, 1);</PRE |
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></P |
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></DIV |
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><DIV |
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CLASS="REFSECT1" |
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><A |
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NAME="AEN6349" |
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></A |
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><H2 |
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>See Also</H2 |
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><P |
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><A |
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HREF="sdljoysticknumaxes.html" |
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><TT |
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CLASS="FUNCTION" |
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>SDL_JoystickNumAxes</TT |
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></A |
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></P |
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>SDL_JoystickUpdate</TD |
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