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<title>Graphics/Gloss/Internals/Interface/Animate.hs</title>
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<pre><a name="line-1"></a>
<a name="line-2"></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'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Interface</span><span class='hs-varop'>.</span><span class='hs-conid'>Animate</span>
<a name="line-3"></a> <span class='hs-layout'>(</span><span class='hs-varid'>animateWithBackendIO</span><span class='hs-layout'>)</span>
<a name="line-4"></a><span class='hs-keyword'>where</span>
<a name="line-5"></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-6"></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-7"></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'>Render</span><span class='hs-varop'>.</span><span class='hs-conid'>Picture</span>
<a name="line-8"></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'>Render</span><span class='hs-varop'>.</span><span class='hs-conid'>ViewPort</span>
<a name="line-9"></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-10"></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'>Window</span>
<a name="line-11"></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'>Common</span><span class='hs-varop'>.</span><span class='hs-conid'>Exit</span>
<a name="line-12"></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-13"></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><span class='hs-varop'>.</span><span class='hs-conid'>KeyMouse</span>
<a name="line-14"></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><span class='hs-varop'>.</span><span class='hs-conid'>Motion</span>
<a name="line-15"></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><span class='hs-varop'>.</span><span class='hs-conid'>Reshape</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'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Interface</span><span class='hs-varop'>.</span><span class='hs-conid'>Animate</span><span class='hs-varop'>.</span><span class='hs-conid'>Timing</span>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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'>Render</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>RS</span>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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><span class='hs-varop'>.</span><span class='hs-conid'>ControlState</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>VPC</span>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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'>Animate</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>AN</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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'>Callback</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Callback</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Mem</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Float</span> <span class='hs-layout'>(</span><span class='hs-varid'>double2Float</span><span class='hs-layout'>)</span>
<a name="line-25"></a>
<a name="line-26"></a><a name="animateWithBackendIO"></a><span class='hs-definition'>animateWithBackendIO</span>
<a name="line-27"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Backend</span> <span class='hs-varid'>a</span>
<a name="line-28"></a> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ Initial State of the backend</span>
<a name="line-29"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <span class='hs-comment'>-- ^ Whether to allow the image to be panned around.</span>
<a name="line-30"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Display</span> <span class='hs-comment'>-- ^ Display mode.</span>
<a name="line-31"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span> <span class='hs-comment'>-- ^ Background color.</span>
<a name="line-32"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Picture</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ Function to produce the next frame of animation.</span>
<a name="line-33"></a> <span class='hs-comment'>-- It is passed the time in seconds since the program started.</span>
<a name="line-34"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-definition'>animateWithBackendIO</span> <span class='hs-varid'>backend</span> <span class='hs-varid'>pannable</span> <span class='hs-varid'>display</span> <span class='hs-varid'>backColor</span> <span class='hs-varid'>frameOp</span>
<a name="line-37"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-38"></a> <span class='hs-comment'>-- </span>
<a name="line-39"></a> <span class='hs-varid'>viewSR</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-varid'>viewPortInit</span>
<a name="line-40"></a> <span class='hs-varid'>viewControlSR</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-conid'>VPC</span><span class='hs-varop'>.</span><span class='hs-varid'>stateInit</span>
<a name="line-41"></a> <span class='hs-varid'>animateSR</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-conid'>AN</span><span class='hs-varop'>.</span><span class='hs-varid'>stateInit</span>
<a name="line-42"></a> <span class='hs-varid'>renderS_</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>RS</span><span class='hs-varop'>.</span><span class='hs-varid'>stateInit</span>
<a name="line-43"></a> <span class='hs-varid'>renderSR</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-varid'>renderS_</span>
<a name="line-44"></a>
<a name="line-45"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>displayFun</span> <span class='hs-varid'>backendRef</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-46"></a> <span class='hs-comment'>-- extract the current time from the state</span>
<a name="line-47"></a> <span class='hs-varid'>timeS</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>animateSR</span> <span class='hs-varop'>`getsIORef`</span> <span class='hs-conid'>AN</span><span class='hs-varop'>.</span><span class='hs-varid'>stateAnimateTime</span>
<a name="line-48"></a>
<a name="line-49"></a> <span class='hs-comment'>-- call the user action to get the animation frame</span>
<a name="line-50"></a> <span class='hs-varid'>picture</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>frameOp</span> <span class='hs-layout'>(</span><span class='hs-varid'>double2Float</span> <span class='hs-varid'>timeS</span><span class='hs-layout'>)</span>
<a name="line-51"></a>
<a name="line-52"></a> <span class='hs-varid'>renderS</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>renderSR</span>
<a name="line-53"></a> <span class='hs-varid'>viewS</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>viewSR</span>
<a name="line-54"></a>
<a name="line-55"></a> <span class='hs-comment'>-- render the frame</span>
<a name="line-56"></a> <span class='hs-varid'>withViewPort</span>
<a name="line-57"></a> <span class='hs-varid'>backendRef</span>
<a name="line-58"></a> <span class='hs-varid'>viewS</span>
<a name="line-59"></a> <span class='hs-layout'>(</span><span class='hs-varid'>renderPicture</span> <span class='hs-varid'>backendRef</span> <span class='hs-varid'>renderS</span> <span class='hs-varid'>viewS</span> <span class='hs-varid'>picture</span><span class='hs-layout'>)</span>
<a name="line-60"></a>
<a name="line-61"></a> <span class='hs-comment'>-- perform GC every frame to try and avoid long pauses</span>
<a name="line-62"></a> <span class='hs-varid'>performGC</span>
<a name="line-63"></a>
<a name="line-64"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>callbacks</span>
<a name="line-65"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span> <span class='hs-conid'>Callback</span><span class='hs-varop'>.</span><span class='hs-conid'>Display</span> <span class='hs-layout'>(</span><span class='hs-varid'>animateBegin</span> <span class='hs-varid'>animateSR</span><span class='hs-layout'>)</span>
<a name="line-66"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Callback</span><span class='hs-varop'>.</span><span class='hs-conid'>Display</span> <span class='hs-varid'>displayFun</span>
<a name="line-67"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Callback</span><span class='hs-varop'>.</span><span class='hs-conid'>Display</span> <span class='hs-layout'>(</span><span class='hs-varid'>animateEnd</span> <span class='hs-varid'>animateSR</span><span class='hs-layout'>)</span>
<a name="line-68"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Callback</span><span class='hs-varop'>.</span><span class='hs-conid'>Idle</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>postRedisplay</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-69"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>callback_exit</span> <span class='hs-conid'>()</span>
<a name="line-70"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>callback_viewPort_motion</span> <span class='hs-varid'>viewSR</span> <span class='hs-varid'>viewControlSR</span>
<a name="line-71"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>callback_viewPort_reshape</span> <span class='hs-keyglyph'>]</span>
<a name="line-72"></a>
<a name="line-73"></a> <span class='hs-varop'>++</span> <span class='hs-layout'>(</span><span class='hs-keyword'>if</span> <span class='hs-varid'>pannable</span>
<a name="line-74"></a> <span class='hs-keyword'>then</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>callback_viewPort_keyMouse</span> <span class='hs-varid'>viewSR</span> <span class='hs-varid'>viewControlSR</span><span class='hs-keyglyph'>]</span>
<a name="line-75"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-76"></a>
<a name="line-77"></a> <span class='hs-varid'>createWindow</span> <span class='hs-varid'>backend</span> <span class='hs-varid'>display</span> <span class='hs-varid'>backColor</span> <span class='hs-varid'>callbacks</span>
<a name="line-78"></a>
<a name="line-79"></a><a name="getsIORef"></a><span class='hs-definition'>getsIORef</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IORef</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>r</span>
<a name="line-80"></a><span class='hs-definition'>getsIORef</span> <span class='hs-varid'>ref</span> <span class='hs-varid'>fun</span>
<a name="line-81"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-varid'>fun</span> <span class='hs-varop'>$</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>ref</span>
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