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 <h1 id="NAME">
-Once in a while .... (set_event_filter)
+SDL 2.511 + Using SDL for quick visualizations
 </h1>
 <div class="CONTENT">
-<div style="text-align: right;"><i> <br />Once in a while <br />Things just work! <br /></i><br /></div><br /><br />So I have been hacking for a while on SDL::Events::set_event_filter. The code below is an example usage. The magic behind this is <a href="http://github.com/kthakore/SDL_perl/blob/1712fe42d62c2a3e382e6bf91366eb2ce9d2f5f4/src/Core/Events.xs">here</a> <br /><br /><pre><a href="" name="line1"> 1</a> <span style="color: #444444;">#!/usr/bin/perl -w<br /><a href="" name="line2"> 2</a> </span><b>use</b> strict;<br /><a href="" name="line3"> 3</a> <b>use</b> warnings;<br /><a href="" name="line4"> 4</a> <b>use</b> SDL v2.3; <span style="color: #444444;">#Require the redesign branch<br /><a href="" name="line5"> 5</a> </span><b>use</b> SDL::Video;<br /><a href="" name="line6"> 6</a> <b>use</b> SDL::Event;<br /><a href="" name="line7"> 7</a> <b>use</b> SDL::Events;<br /><a href="" name="line8"> 8</a> <br /><a href="" name="line9"> 9</a> SDL::init<span style="color: #4444ff;"><b>(</b></span>SDL_INIT_VIDEO<span style="color: #4444ff;"><b>)</b></span>;<br /><a href="" name="line10">10</a> <b>my</b> <span style="color: #2040a0;">$display</span> = SDL::Video::set_video_mode<span style="color: #4444ff;"><b>(</b></span>640,480,32, SDL_SWSURFACE <span style="color: #4444ff;"><b>)</b></span>;<br /><a href="" name="line11">11</a> <b>my</b>  <span style="color: #2040a0;">$event</span> = SDL::Event-&gt;<b>new</b><span style="color: #4444ff;"><b>(</b></span><span style="color: #4444ff;"><b>)</b></span>;<br /><a href="" name="line12">12</a> <br /><a href="" name="line13">13</a> <span style="color: #444444;">#This filters out all ActiveEvents<br /><a href="" name="line14">14</a> </span><b>my</b> <span style="color: #2040a0;">$filter</span> = sub <span style="color: #4444ff;"><b>{</b></span> <br /><a href="" name="line15">15</a>      <b>my</b> <span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$e</span>, <span style="color: #2040a0;">$type</span><span style="color: #4444ff;"><b>)</b></span> = <span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$_</span><span style="color: #4444ff;"><b>[</b></span>0<span style="color: #4444ff;"><b>]</b></span>, <span style="color: #2040a0;">$_</span><span style="color: #4444ff;"><b>[</b></span>0<span style="color: #4444ff;"><b>]</b></span>-&gt;type<span style="color: #4444ff;"><b>)</b></span>; <br /><a href="" name="line16">16</a>      <b>if</b><span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$type</span> == SDL_ACTIVEEVENT<span style="color: #4444ff;"><b>)</b></span><span style="color: #4444ff;"><b>{</b></span> <b>return</b> 0 <span style="color: #4444ff;"><b>}</b></span> <br /><a href="" name="line17">17</a>      <b>elsif</b><span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$type</span> == SDL_MOUSEBUTTONDOWN &amp;&amp; <span style="color: #2040a0;">$e</span>-&gt;button_button == 1<span style="color: #4444ff;"><b>)</b></span><span style="color: #4444ff;"><b>{</b></span> <b>return</b> 0 <span style="color: #4444ff;"><b>}</b></span><br /><a href="" name="line18">18</a>      <b>else</b> <span style="color: #4444ff;"><b>{</b></span> <b>return</b> 1; <span style="color: #4444ff;"><b>}</b></span><br /><a href="" name="line19">19</a>       <span style="color: #4444ff;"><b>}</b></span>;<br /><a href="" name="line20">20</a> <br /><a href="" name="line21">21</a> SDL::Events::set_event_filter<span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$filter</span><span style="color: #4444ff;"><b>)</b></span>;<br /><a href="" name="line22">22</a> <br /><a href="" name="line23">23</a> <b>while</b><span style="color: #4444ff;"><b>(</b></span>1<span style="color: #4444ff;"><b>)</b></span><br /><a href="" name="line24">24</a> <span style="color: #4444ff;"><b>{</b></span><br /><a href="" name="line25">25</a> <br /><a href="" name="line26">26</a>   SDL::Events::pump_events<span style="color: #4444ff;"><b>(</b></span><span style="color: #4444ff;"><b>)</b></span>;<br /><a href="" name="line27">27</a>   <b>if</b><span style="color: #4444ff;"><b>(</b></span>SDL::Events::poll_event<span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$event</span><span style="color: #4444ff;"><b>)</b></span><span style="color: #4444ff;"><b>)</b></span><br /><a href="" name="line28">28</a>   <span style="color: #4444ff;"><b>{</b></span><br /><a href="" name="line29">29</a> <br /><a href="" name="line30">30</a>   <b>if</b><span style="color: #4444ff;"><b>(</b></span>  <span style="color: #2040a0;">$event</span>-&gt;type == SDL_ACTIVEEVENT<span style="color: #4444ff;"><b>)</b></span><br /><a href="" name="line31">31</a>  <span style="color: #4444ff;"><b>{</b></span><br /><a href="" name="line32">32</a>  <span style="color: brown;"><b>print</b></span> <span style="color: green;">"Hello Mouse!!!<span style="color: #77dd77;">\n</span>"</span> <b>if</b> <span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$event</span>-&gt;active_gain &amp;&amp; <span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$event</span>-&gt;active_state == SDL_APPMOUSEFOCUS<span style="color: #4444ff;"><b>)</b></span> <span style="color: #4444ff;"><b>)</b></span>;<br /><a href="" name="line33">33</a>  <span style="color: brown;"><b>print</b></span> <span style="color: green;">"Bye Mouse!!!<span style="color: #77dd77;">\n</span>"</span> <b>if</b> <span style="color: #4444ff;"><b>(</b></span>!<span style="color: #2040a0;">$event</span>-&gt;active_gain &amp;&amp; <span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$event</span>-&gt;active_state == SDL_APPMOUSEFOCUS<span style="color: #4444ff;"><b>)</b></span> <span style="color: #4444ff;"><b>)</b></span>;<br /><a href="" name="line34">34</a>         <span style="color: #4444ff;"><b>}</b></span><br /><a href="" name="line35">35</a>   <b>if</b><span style="color: #4444ff;"><b>(</b></span> <span style="color: #2040a0;">$event</span>-&gt;type == SDL_MOUSEBUTTONDOWN<span style="color: #4444ff;"><b>)</b></span><br /><a href="" name="line36">36</a>    <span style="color: #4444ff;"><b>{</b></span><br /><a href="" name="line37">37</a>  <b>my</b> <span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$x</span>, <span style="color: #2040a0;">$y</span>, <span style="color: #2040a0;">$but</span> <span style="color: #4444ff;"><b>)</b></span> = <span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$event</span>-&gt;button_x, <span style="color: #2040a0;">$event</span>-&gt;button_y, <span style="color: #2040a0;">$event</span>-&gt;button_button<span style="color: #4444ff;"><b>)</b></span>;<br /><a href="" name="line38">38</a>  <span style="color: brown;"><b>warn</b></span> <span style="color: green;">"<span style="color: #2040a0;">$but</span> CLICK!!! at <span style="color: #2040a0;">$x</span> and <span style="color: #2040a0;">$y</span> <span style="color: #77dd77;">\n</span>"</span>;<br /><a href="" name="line39">39</a>  <span style="color: #4444ff;"><b>}</b></span><br /><a href="" name="line40">40</a> <br /><a href="" name="line41">41</a>       <b>last</b> <b>if</b><span style="color: #4444ff;"><b>(</b></span><span style="color: #2040a0;">$event</span>-&gt;type == SDL_QUIT<span style="color: #4444ff;"><b>)</b></span>;<br /><a href="" name="line42">42</a>   <span style="color: #4444ff;"><b>}</b></span><br /><a href="" name="line43">43</a> <span style="color: #4444ff;"><b>}</b></span><br /><a href="" name="line44">44</a> SDL::quit<span style="color: #4444ff;"><b>(</b></span><span style="color: #4444ff;"><b>)</b></span>;&nbsp;</pre><pre>&nbsp;</pre><pre>&nbsp;</pre><pre>Tinker with $filter and look at perldoc lib/SDL/pods/Event.pod.&nbsp;</pre><pre>&nbsp;</pre><pre>Have fun,</pre><pre>--yapgh</pre><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3102167581424744259-2301663122914111362?l=yapgh.blogspot.com' alt='' /></div></div></div>
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+SDL Perl 2.511 is showing great promises. The initial tests show a great deal of stability.&nbsp;<a href="http://search.cpan.org/~kthakore/SDL-2.511/">http://search.cpan.org/~kthakore/SDL-2.511/</a><br />
+<br />
+&nbsp;Moreover we are seeing more varied users of SDL Perl.<br />
+<br />
+John.O Writes:<br />
+<hr /><br />
+This is for a tool that we'll be providing our dealers... it measures cellular modem signal strengths out in the middle of nowhere, so dealers can evaluate if our products will work in customers' fields. And of course, I'm using Perl/SDL for the graphics... C gets on my nerves.<br />
+<br />
+Our company is <a href="http://smartfield.com/">http://smartfield.com</a>.<br />
+<br />
+John O.<br />
+<br />
+<div class="separator" style="clear: both; text-align: center;"><a href="http://sdlperl.ath.cx/screenshot2.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="192" src="http://sdlperl.ath.cx/screenshot2.png" width="320" /></a></div><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3102167581424744259-4625022127595563867?l=yapgh.blogspot.com' alt='' /></div>
+<p><a href="http://feedads.g.doubleclick.net/~a/4ef14C7N9N6loLPCw2LnQe-salU/0/da"><img src="http://feedads.g.doubleclick.net/~a/4ef14C7N9N6loLPCw2LnQe-salU/0/di" border="0" ismap="true"></img></a><br/>
+<a href="http://feedads.g.doubleclick.net/~a/4ef14C7N9N6loLPCw2LnQe-salU/1/da"><img src="http://feedads.g.doubleclick.net/~a/4ef14C7N9N6loLPCw2LnQe-salU/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/YetAnotherPerlGameHackeryapgh/~4/taMSrti4vNc" height="1" width="1"/></div></div>
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