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<title>Graphics/Gloss/Internals/Interface/ViewPort/Motion.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS_HADDOCK hide #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE ScopedTypeVariables, RankNTypes #-}</span>
<a name="line-3"></a>
<a name="line-4"></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'>ViewPort</span><span class='hs-varop'>.</span><span class='hs-conid'>Motion</span>
<a name="line-5"></a> <span class='hs-layout'>(</span><span class='hs-varid'>callback_viewPort_motion</span><span class='hs-layout'>)</span>
<a name="line-6"></a><span class='hs-keyword'>where</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'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Vector</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'>Geometry</span><span class='hs-varop'>.</span><span class='hs-conid'>Angle</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'>ViewPort</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'>Callback</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'>Backend</span>
<a name="line-12"></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-13"></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'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>OpenGL</span><span class='hs-varop'>.</span><span class='hs-conid'>GL</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>GL</span>
<a name="line-14"></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-15"></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-16"></a>
<a name="line-17"></a>
<a name="line-18"></a><a name="callback_viewPort_motion"></a><span class='hs-comment'>-- | Callback to handle keyboard and mouse button events</span>
<a name="line-19"></a><span class='hs-comment'>-- for controlling the viewport.</span>
<a name="line-20"></a><span class='hs-definition'>callback_viewPort_motion</span>
<a name="line-21"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IORef</span> <span class='hs-conid'>ViewPort</span> <span class='hs-comment'>-- ^ ref to ViewPort state</span>
<a name="line-22"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IORef</span> <span class='hs-conid'>VPC</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span> <span class='hs-comment'>-- ^ ref to ViewPort Control state</span>
<a name="line-23"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Callback</span>
<a name="line-24"></a>
<a name="line-25"></a><span class='hs-definition'>callback_viewPort_motion</span> <span class='hs-varid'>portRef</span> <span class='hs-varid'>controlRef</span>
<a name="line-26"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Motion</span> <span class='hs-layout'>(</span><span class='hs-varid'>viewPort_motion</span> <span class='hs-varid'>portRef</span> <span class='hs-varid'>controlRef</span><span class='hs-layout'>)</span>
<a name="line-27"></a>
<a name="line-28"></a><a name="viewPort_motion"></a><span class='hs-definition'>viewPort_motion</span>
<a name="line-29"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IORef</span> <span class='hs-conid'>ViewPort</span>
<a name="line-30"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IORef</span> <span class='hs-conid'>VPC</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span>
<a name="line-31"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MotionCallback</span>
<a name="line-32"></a>
<a name="line-33"></a><span class='hs-definition'>viewPort_motion</span>
<a name="line-34"></a> <span class='hs-varid'>portRef</span> <span class='hs-varid'>controlRef</span>
<a name="line-35"></a> <span class='hs-varid'>stateRef</span>
<a name="line-36"></a> <span class='hs-varid'>pos</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'>-- putStr $ "motion pos = " ++ show pos ++ "\n"</span>
<a name="line-39"></a>
<a name="line-40"></a> <span class='hs-varid'>translateMark</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>controlRef</span> <span class='hs-varop'>`getsIORef`</span> <span class='hs-conid'>VPC</span><span class='hs-varop'>.</span><span class='hs-varid'>stateTranslateMark</span>
<a name="line-41"></a> <span class='hs-varid'>rotateMark</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>controlRef</span> <span class='hs-varop'>`getsIORef`</span> <span class='hs-conid'>VPC</span><span class='hs-varop'>.</span><span class='hs-varid'>stateRotateMark</span>
<a name="line-42"></a>
<a name="line-43"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>case</span> <span class='hs-varid'>translateMark</span> <span class='hs-keyword'>of</span>
<a name="line-44"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-45"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>markX</span><span class='hs-layout'>,</span> <span class='hs-varid'>markY</span><span class='hs-layout'>)</span>
<a name="line-46"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-47"></a> <span class='hs-varid'>motionTranslate</span>
<a name="line-48"></a> <span class='hs-varid'>portRef</span> <span class='hs-varid'>controlRef</span>
<a name="line-49"></a> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>markX</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>markY</span><span class='hs-layout'>)</span>
<a name="line-50"></a> <span class='hs-varid'>pos</span>
<a name="line-51"></a> <span class='hs-varid'>postRedisplay</span> <span class='hs-varid'>stateRef</span><span class='hs-layout'>)</span>
<a name="line-52"></a>
<a name="line-53"></a>
<a name="line-54"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>case</span> <span class='hs-varid'>rotateMark</span> <span class='hs-keyword'>of</span>
<a name="line-55"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-56"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>markX</span><span class='hs-layout'>,</span> <span class='hs-varid'>markY</span><span class='hs-layout'>)</span>
<a name="line-57"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-58"></a> <span class='hs-varid'>motionRotate</span>
<a name="line-59"></a> <span class='hs-varid'>portRef</span> <span class='hs-varid'>controlRef</span>
<a name="line-60"></a> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>markX</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>markY</span><span class='hs-layout'>)</span>
<a name="line-61"></a> <span class='hs-varid'>pos</span>
<a name="line-62"></a> <span class='hs-varid'>postRedisplay</span> <span class='hs-varid'>stateRef</span><span class='hs-layout'>)</span>
<a name="line-63"></a>
<a name="line-64"></a>
<a name="line-65"></a><a name="motionTranslate"></a><span class='hs-definition'>motionTranslate</span>
<a name="line-66"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IORef</span> <span class='hs-conid'>ViewPort</span>
<a name="line-67"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IORef</span> <span class='hs-conid'>VPC</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span>
<a name="line-68"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>GLint</span><span class='hs-layout'>,</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>GLint</span><span class='hs-layout'>)</span>
<a name="line-69"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-70"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-71"></a>
<a name="line-72"></a><span class='hs-definition'>motionTranslate</span>
<a name="line-73"></a> <span class='hs-varid'>portRef</span> <span class='hs-varid'>controlRef</span>
<a name="line-74"></a> <span class='hs-layout'>(</span><span class='hs-varid'>markX</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>GLint</span><span class='hs-layout'>,</span> <span class='hs-varid'>markY</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>GLint</span><span class='hs-layout'>)</span>
<a name="line-75"></a> <span class='hs-layout'>(</span><span class='hs-varid'>posX</span><span class='hs-layout'>,</span> <span class='hs-varid'>posY</span><span class='hs-layout'>)</span>
<a name="line-76"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-77"></a> <span class='hs-layout'>(</span><span class='hs-varid'>transX</span><span class='hs-layout'>,</span> <span class='hs-varid'>transY</span><span class='hs-layout'>)</span>
<a name="line-78"></a> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>portRef</span> <span class='hs-varop'>`getsIORef`</span> <span class='hs-varid'>viewPortTranslate</span>
<a name="line-79"></a>
<a name="line-80"></a> <span class='hs-varid'>scale</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>portRef</span> <span class='hs-varop'>`getsIORef`</span> <span class='hs-varid'>viewPortScale</span>
<a name="line-81"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>portRef</span> <span class='hs-varop'>`getsIORef`</span> <span class='hs-varid'>viewPortRotate</span>
<a name="line-82"></a>
<a name="line-83"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>dX</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-varid'>markX</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>posX</span><span class='hs-layout'>)</span>
<a name="line-84"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>dY</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-varid'>markY</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>posY</span><span class='hs-layout'>)</span>
<a name="line-85"></a>
<a name="line-86"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>offset</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>dX</span> <span class='hs-varop'>/</span> <span class='hs-varid'>scale</span><span class='hs-layout'>,</span> <span class='hs-varid'>dY</span> <span class='hs-varop'>/</span> <span class='hs-varid'>scale</span><span class='hs-layout'>)</span>
<a name="line-87"></a>
<a name="line-88"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>oX</span><span class='hs-layout'>,</span> <span class='hs-varid'>oY</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rotateV</span> <span class='hs-layout'>(</span><span class='hs-varid'>degToRad</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>offset</span>
<a name="line-89"></a>
<a name="line-90"></a> <span class='hs-varid'>portRef</span> <span class='hs-varop'>`modifyIORef`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span>
<a name="line-91"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>viewPortTranslate</span>
<a name="line-92"></a> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span> <span class='hs-varid'>transX</span> <span class='hs-comment'>-</span> <span class='hs-varid'>oX</span>
<a name="line-93"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>transY</span> <span class='hs-varop'>+</span> <span class='hs-varid'>oY</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-94"></a>
<a name="line-95"></a> <span class='hs-varid'>controlRef</span> <span class='hs-varop'>`modifyIORef`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span>
<a name="line-96"></a> <span class='hs-layout'>{</span> <span class='hs-conid'>VPC</span><span class='hs-varop'>.</span><span class='hs-varid'>stateTranslateMark</span>
<a name="line-97"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>posX</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>posY</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-98"></a>
<a name="line-99"></a>
<a name="line-100"></a><a name="motionRotate"></a><span class='hs-definition'>motionRotate</span>
<a name="line-101"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IORef</span> <span class='hs-conid'>ViewPort</span>
<a name="line-102"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IORef</span> <span class='hs-conid'>VPC</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span>
<a name="line-103"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>GLint</span><span class='hs-layout'>,</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>GLint</span><span class='hs-layout'>)</span>
<a name="line-104"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-105"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-106"></a>
<a name="line-107"></a><span class='hs-definition'>motionRotate</span>
<a name="line-108"></a> <span class='hs-varid'>portRef</span> <span class='hs-varid'>controlRef</span>
<a name="line-109"></a> <span class='hs-layout'>(</span><span class='hs-varid'>markX</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>GLint</span><span class='hs-layout'>,</span> <span class='hs-sel'>_markY</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>GLint</span><span class='hs-layout'>)</span>
<a name="line-110"></a> <span class='hs-layout'>(</span><span class='hs-varid'>posX</span><span class='hs-layout'>,</span> <span class='hs-varid'>posY</span><span class='hs-layout'>)</span>
<a name="line-111"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-112"></a> <span class='hs-varid'>rotate</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>portRef</span> <span class='hs-varop'>`getsIORef`</span> <span class='hs-varid'>viewPortRotate</span>
<a name="line-113"></a> <span class='hs-varid'>rotateFactor</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>controlRef</span> <span class='hs-varop'>`getsIORef`</span> <span class='hs-conid'>VPC</span><span class='hs-varop'>.</span><span class='hs-varid'>stateRotateFactor</span>
<a name="line-114"></a>
<a name="line-115"></a> <span class='hs-varid'>portRef</span> <span class='hs-varop'>`modifyIORef`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span>
<a name="line-116"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>viewPortRotate</span>
<a name="line-117"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rotate</span> <span class='hs-varop'>+</span> <span class='hs-varid'>rotateFactor</span> <span class='hs-varop'>*</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>posX</span><span class='hs-layout'>)</span> <span class='hs-comment'>-</span> <span class='hs-varid'>markX</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-118"></a>
<a name="line-119"></a> <span class='hs-varid'>controlRef</span> <span class='hs-varop'>`modifyIORef`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span>
<a name="line-120"></a> <span class='hs-layout'>{</span> <span class='hs-conid'>VPC</span><span class='hs-varop'>.</span><span class='hs-varid'>stateRotateMark</span>
<a name="line-121"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>posX</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>posY</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-122"></a>
<a name="line-123"></a>
<a name="line-124"></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-125"></a><span class='hs-definition'>getsIORef</span> <span class='hs-varid'>ref</span> <span class='hs-varid'>fun</span>
<a name="line-126"></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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