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<a name="Joystick"></a>
<div class="header">
<p>
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<hr>
<a name="Joystick-1"></a>
<h4 class="subsection">4.4.3 Joystick</h4>
<div class="example">
<pre class="example">(use-modules (sly input joystick))
</pre></div>
<p>Joystick hooks, signals, and procedures.
</p>
<p>Before using joystick procedures, you must first call the
initialization procedure <code>enable-joystick</code>.
</p>
<dl>
<dt><a name="index-enable_002djoystick"></a>Scheme Procedure: <strong>enable-joystick</strong></dt>
<dd><p>Initialize joystick module.
</p></dd></dl>
<dl>
<dt><a name="index-joystick_002dnum_002daxes"></a>Scheme Procedure: <strong>joystick-num-axes</strong> <em><var>idx</var></em></dt>
<dd><p>Get number of axes of joystick at <code>idx</code>.
</p></dd></dl>
<dl>
<dt><a name="index-joystick_002dnum_002dbuttons"></a>Scheme Procedure: <strong>joystick-num-buttons</strong> <em><var>idx</var></em></dt>
<dd><p>Get number of buttons of joystick at <code>idx</code>.
</p></dd></dl>
<dl>
<dt><a name="index-joystick_002daxis_002dhook"></a>Scheme Variable: <strong>joystick-axis-hook</strong></dt>
<dd><p>This hook is run whenever a joystick motion occurs. Procedures added
to this hook should accept three arguments: <code>which</code>, the joystick
ID; <code>axis</code>, the axis ID; and <code>value</code>, the motion coordinate.
</p></dd></dl>
<dl>
<dt><a name="index-joystick_002dbutton_002dpress_002dhook"></a>Scheme Variable: <strong>joystick-button-press-hook</strong></dt>
<dd><p>This hook is run whenever a joystick button is pressed. Procedures
added to this hook should accept two arguments: <code>which</code>, the
joystick ID; <code>button</code>, the button ID.
</p></dd></dl>
<dl>
<dt><a name="index-joystick_002dbutton_002drelease_002dhook"></a>Scheme Variable: <strong>joystick-button-release-hook</strong></dt>
<dd><p>This hook is run whenever a joystick button is released. Procedures
added to this hook should accept two arguments: <code>which</code>, the
joystick ID; <code>button</code>, the button ID.
</p></dd></dl>
<dl>
<dt><a name="index-raw_002daxis_002dmin"></a>Scheme Variable: <strong>raw-axis-min</strong></dt>
<dd><p>-32768
</p></dd></dl>
<dl>
<dt><a name="index-raw_002daxis_002dmax"></a>Scheme Variable: <strong>raw-axis-max</strong></dt>
<dd><p>32767
</p></dd></dl>
<dl>
<dt><a name="index-axis_002dvalue_002draw"></a>Scheme Procedure: <strong>axis-value-raw</strong> <em><var>idx</var> <var>axis</var></em></dt>
<dd><p>Create a signal on the axis at <code>axis</code> of the joystick at
<var>idx</var>; joystick axis values are stored in a signed 16 bit integer
and so, values range from [<code>raw-axis-min</code>, <code>raw-axis-max</code>].
</p></dd></dl>
<dl>
<dt><a name="index-axis_002dvalue"></a>Scheme Procedure: <strong>axis-value</strong> <em><var>idx</var> <var>axis</var></em></dt>
<dd><p>Create a signal for the value of <var>axis</var> on joystick <var>idx</var>;
values are scaled to the range [-1,1].
</p></dd></dl>
<dl>
<dt><a name="index-button_002ddown_003f"></a>Scheme Procedure: <strong>button-down?</strong> <em><var>idx</var> <var>n</var></em></dt>
<dd><p>Create a signal for the state of button <code>n</code> on joystick at
<code>idx</code>.
</p></dd></dl>
<dl>
<dt><a name="index-make_002ddirectional_002dsignal"></a>Scheme Procedure: <strong>make-directional-signal</strong> <em><var>idx</var> <var>x-axis</var> <var>y-axis</var></em></dt>
<dd><p>Create a signal for a directional pad or analog stick with <code>x</code>
and <code>y</code> axes. Values are scaled to the range [-1,1].
</p></dd></dl>
<dl>
<dt><a name="index-make_002ddirectional_002dsignal_002draw"></a>Scheme Procedure: <strong>make-directional-signal-raw</strong> <em>idx x-axis y-axis</em></dt>
<dd><p>Create a signal for a directional pad or analog stick with <code>x</code>
and <code>y</code> axes. Values range from [<code>raw-axis-min</code>,
<code>raw-axis-max</code>].
</p></dd></dl>
<dl>
<dt><a name="index-axis_002dscale"></a>Scheme Procedure: <strong>axis-scale</strong> <em><var>raw-value</var></em></dt>
<dd><p>Map <code>raw-value</code> in the range [<code>raw-axis-min</code>,
<code>raw-axis-max</code>] to a value in the range [-1, 1].
</p></dd></dl>
<dl>
<dt><a name="index-joystick_002dname"></a>Scheme Procedure: <strong>joystick-name</strong> <em><var>joystick</var></em></dt>
<dd><p>Return the name of <code>joystick</code>.
</p></dd></dl>
<dl>
<dt><a name="index-num_002djoysticks"></a>Scheme Procedure: <strong>num-joysticks</strong></dt>
<dd><p>Return the number of joysticks available.
</p></dd></dl>
<hr>
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