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POdebug output of game objects in Haskell/Yampa and HOOD
 

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  1. POdebug output of game objects in Haskell/Yampa and HOOD
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    <p>I'm stuck with generating debug output for my game objects using Haskell/Yampa (=Arrows) (with HOOD).</p> <p>My engine basically runs a list of game objects which produce Output states (line, circle) which are then rendered.</p> <pre><code>data Output = Circle Position2 Double | Line Vector2 output :: [Output] -&gt; IO () output oos = mapM render oos render :: Output -&gt; IO () render (Circle p r) = drawCircle p r render (Line vec) = drawLine (Point2 0 0) vec </code></pre> <p>The player object just moves to the right and is represented as a (positioned) circle.</p> <pre><code>playerObject :: SF () Output -- SF is an Arrow run by time p &lt;- mover (Point2 0 0) -&lt; (Vector2 10 0) returnA -&lt; (Circle p 2.0) </code></pre> <p>mover is just a simple integrator (acceleration->velocity->position) where I want to observe the velocity and render it as debug output as an (unpositioned) Line.</p> <pre><code>mover :: Position2 -&gt; SF Vector2 Position2 mover position0 = proc acceleration -&gt; do velocity &lt;- integral -&lt; acceleration -- !! I want to observe velocity position &lt;- (position0 .+^) ^&lt;&lt; integral -&lt; velocity returnA -&lt; position </code></pre> <p>How can I create additional graphical debug output for internal values of my game object functions?</p> <p>What actually should happen is in output, first render the actual object (circle) but also render additional debug output (movement vector as line). Probably I can achieve this with HOOD but I'm still not fluent in Haskell and don't know how do adopt the HOOD tutorial for my case.</p>
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