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<title>Graphics/Gloss/Interface/Pure/Simulate.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE RankNTypes #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>-- We export this stuff separately so we don't clutter up the </span>
<a name="line-4"></a><span class='hs-comment'>-- API of the Graphics.Gloss module.</span>
<a name="line-5"></a>
<a name="line-6"></a><span class='hs-comment'>-- | Simulate mode is for producing an animation of some model who's picture</span>
<a name="line-7"></a><span class='hs-comment'>-- changes over finite time steps. The behavior of the model can also depent</span>
<a name="line-8"></a><span class='hs-comment'>-- on the current `ViewPort`.</span>
<a name="line-9"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Interface</span><span class='hs-varop'>.</span><span class='hs-conid'>Pure</span><span class='hs-varop'>.</span><span class='hs-conid'>Simulate</span>
<a name="line-10"></a> <span class='hs-layout'>(</span> <span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Display</span>
<a name="line-11"></a> <span class='hs-layout'>,</span> <span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Picture</span>
<a name="line-12"></a> <span class='hs-layout'>,</span> <span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Color</span>
<a name="line-13"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>simulate</span>
<a name="line-14"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>ViewPort</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-15"></a><span class='hs-keyword'>where</span>
<a name="line-16"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Display</span>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Picture</span>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Color</span>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Interface</span><span class='hs-varop'>.</span><span class='hs-conid'>ViewPort</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Interface</span><span class='hs-varop'>.</span><span class='hs-conid'>Simulate</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Interface</span><span class='hs-varop'>.</span><span class='hs-conid'>Backend</span>
<a name="line-22"></a>
<a name="line-23"></a>
<a name="line-24"></a><a name="simulate"></a><span class='hs-comment'>-- | Run a finite-time-step simulation in a window. You decide how the model is represented,</span>
<a name="line-25"></a><span class='hs-comment'>-- how to convert the model to a picture, and how to advance the model for each unit of time. </span>
<a name="line-26"></a><span class='hs-comment'>-- This function does the rest.</span>
<a name="line-27"></a><span class='hs-comment'>--</span>
<a name="line-28"></a><span class='hs-comment'>-- Once the window is open you can use the same commands as with @display@.</span>
<a name="line-29"></a><span class='hs-comment'>--</span>
<a name="line-30"></a><span class='hs-definition'>simulate</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>model</span>
<a name="line-31"></a> <span class='hs-varop'>.</span> <span class='hs-conid'>Display</span> <span class='hs-comment'>-- ^ Display mode.</span>
<a name="line-32"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span> <span class='hs-comment'>-- ^ Background color.</span>
<a name="line-33"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Number of simulation steps to take for each second of real time.</span>
<a name="line-34"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>model</span> <span class='hs-comment'>-- ^ The initial model.</span>
<a name="line-35"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>model</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Picture</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ A function to convert the model to a picture.</span>
<a name="line-36"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>ViewPort</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>model</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>model</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ A function to step the model one iteration. It is passed the </span>
<a name="line-37"></a> <span class='hs-comment'>-- current viewport and the amount of time for this simulation</span>
<a name="line-38"></a> <span class='hs-comment'>-- step (in seconds).</span>
<a name="line-39"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-40"></a>
<a name="line-41"></a><span class='hs-definition'>simulate</span> <span class='hs-varid'>display</span> <span class='hs-varid'>backColor</span> <span class='hs-varid'>simResolution</span>
<a name="line-42"></a> <span class='hs-varid'>modelStart</span> <span class='hs-varid'>modelToPicture</span> <span class='hs-varid'>modelStep</span>
<a name="line-43"></a>
<a name="line-44"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>simulateWithBackendIO</span> <span class='hs-varid'>defaultBackendState</span>
<a name="line-45"></a> <span class='hs-varid'>display</span> <span class='hs-varid'>backColor</span> <span class='hs-varid'>simResolution</span>
<a name="line-46"></a> <span class='hs-varid'>modelStart</span>
<a name="line-47"></a> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-varid'>modelToPicture</span><span class='hs-layout'>)</span>
<a name="line-48"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>view</span> <span class='hs-varid'>time</span> <span class='hs-varid'>model</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>modelStep</span> <span class='hs-varid'>view</span> <span class='hs-varid'>time</span> <span class='hs-varid'>model</span><span class='hs-layout'>)</span>
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<a name="line-50"></a>
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