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<title>Graphics/Gloss/Internals/Render/Circle.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE BangPatterns, MagicHash, PatternGuards #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# OPTIONS_HADDOCK hide #-}</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-comment'>-- | Fast(ish) rendering of circles.</span>
<a name="line-5"></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'>Render</span><span class='hs-varop'>.</span><span class='hs-conid'>Circle</span>
<a name="line-6"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>renderCircle</span>
<a name="line-7"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>renderArc</span><span class='hs-layout'>)</span>
<a name="line-8"></a><span class='hs-keyword'>where</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'>Render</span><span class='hs-varop'>.</span><span class='hs-conid'>Common</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'>Geometry</span><span class='hs-varop'>.</span><span class='hs-conid'>Angle</span>
<a name="line-11"></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-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Exts</span>
<a name="line-13"></a>
<a name="line-14"></a>
<a name="line-15"></a><a name="circleSteps"></a><span class='hs-comment'>-- | Decide how many line segments to use to render the circle.</span>
<a name="line-16"></a><span class='hs-comment'>-- The number of segments we should use to get a nice picture depends on </span>
<a name="line-17"></a><span class='hs-comment'>-- the size of the circle on the screen, not its intrinsic radius.</span>
<a name="line-18"></a><span class='hs-comment'>-- If the viewport has been zoomed-in then we need to use more segments.</span>
<a name="line-19"></a><span class='hs-comment'>--</span>
<a name="line-20"></a><span class='hs-comment'>{-# INLINE circleSteps #-}</span>
<a name="line-21"></a><span class='hs-definition'>circleSteps</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-22"></a><span class='hs-definition'>circleSteps</span> <span class='hs-varid'>sDiam</span>
<a name="line-23"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>sDiam</span> <span class='hs-varop'><</span> <span class='hs-num'>8</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>8</span>
<a name="line-24"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>sDiam</span> <span class='hs-varop'><</span> <span class='hs-num'>16</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>16</span>
<a name="line-25"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>sDiam</span> <span class='hs-varop'><</span> <span class='hs-num'>32</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>32</span>
<a name="line-26"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>64</span>
<a name="line-27"></a>
<a name="line-28"></a>
<a name="line-29"></a><a name="renderCircle"></a><span class='hs-comment'>-- Circle ---------------------------------------------------------------------</span>
<a name="line-30"></a><span class='hs-comment'>-- | Render a circle with the given thickness</span>
<a name="line-31"></a><span class='hs-definition'>renderCircle</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-32"></a><span class='hs-definition'>renderCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>scaleFactor</span> <span class='hs-varid'>radius_</span> <span class='hs-varid'>thickness_</span>
<a name="line-33"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-varid'>abs</span> <span class='hs-varid'>radius_</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>abs</span> <span class='hs-varid'>thickness_</span><span class='hs-layout'>)</span>
<a name="line-34"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>go</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>thickness</span>
<a name="line-35"></a>
<a name="line-36"></a> <span class='hs-comment'>-- If the circle is smaller than a pixel, render it as a point.</span>
<a name="line-37"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>thickness</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span>
<a name="line-38"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>radScreen</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>scaleFactor</span> <span class='hs-varop'>*</span> <span class='hs-layout'>(</span><span class='hs-varid'>radius</span> <span class='hs-varop'>+</span> <span class='hs-varid'>thickness</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-39"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>radScreen</span> <span class='hs-varop'><=</span> <span class='hs-num'>1</span>
<a name="line-40"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>renderPrimitive</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Points</span>
<a name="line-41"></a> <span class='hs-varop'>$</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>vertex</span> <span class='hs-varop'>$</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Vertex2</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>posX</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>posY</span><span class='hs-layout'>)</span>
<a name="line-42"></a>
<a name="line-43"></a> <span class='hs-comment'>-- Render zero thickness circles with lines.</span>
<a name="line-44"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>thickness</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span>
<a name="line-45"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>radScreen</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>scaleFactor</span> <span class='hs-varop'>*</span> <span class='hs-varid'>radius</span>
<a name="line-46"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>steps</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>circleSteps</span> <span class='hs-varid'>radScreen</span>
<a name="line-47"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>renderCircleLine</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>steps</span> <span class='hs-varid'>radius</span>
<a name="line-48"></a>
<a name="line-49"></a> <span class='hs-comment'>-- Some thick circle.</span>
<a name="line-50"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>radScreen</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>scaleFactor</span> <span class='hs-varop'>*</span> <span class='hs-layout'>(</span><span class='hs-varid'>radius</span> <span class='hs-varop'>+</span> <span class='hs-varid'>thickness</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-51"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>steps</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>circleSteps</span> <span class='hs-varid'>radScreen</span>
<a name="line-52"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>renderCircleStrip</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>steps</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>thickness</span>
<a name="line-53"></a>
<a name="line-54"></a>
<a name="line-55"></a><a name="renderCircleLine"></a><span class='hs-comment'>-- | Render a circle as a line.</span>
<a name="line-56"></a><span class='hs-definition'>renderCircleLine</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-57"></a><span class='hs-definition'>renderCircleLine</span> <span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>posX</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>posY</span><span class='hs-layout'>)</span> <span class='hs-varid'>steps</span> <span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>rad</span><span class='hs-layout'>)</span>
<a name="line-58"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>steps</span>
<a name="line-59"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tStep</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-num'>2</span> <span class='hs-varop'>*</span> <span class='hs-varid'>pi</span><span class='hs-layout'>)</span> <span class='hs-varop'>/</span> <span class='hs-varid'>n</span>
<a name="line-60"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tStop</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-num'>2</span> <span class='hs-varop'>*</span> <span class='hs-varid'>pi</span><span class='hs-layout'>)</span>
<a name="line-61"></a>
<a name="line-62"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>renderPrimitive</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>LineLoop</span>
<a name="line-63"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>renderCircleLine_step</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>tStep</span> <span class='hs-varid'>tStop</span> <span class='hs-varid'>rad</span> <span class='hs-num'>0.0</span><span class='hs-cpp'>#</span>
<a name="line-64"></a><span class='hs-comment'>{-# INLINE renderCircleLine #-}</span>
<a name="line-65"></a>
<a name="line-66"></a>
<a name="line-67"></a><a name="renderCircleStrip"></a><span class='hs-comment'>-- | Render a circle with a given thickness as a triangle strip</span>
<a name="line-68"></a><span class='hs-definition'>renderCircleStrip</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-69"></a><span class='hs-definition'>renderCircleStrip</span> <span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>posX</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>posY</span><span class='hs-layout'>)</span> <span class='hs-varid'>steps</span> <span class='hs-varid'>r</span> <span class='hs-varid'>width</span>
<a name="line-70"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>steps</span>
<a name="line-71"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tStep</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-num'>2</span> <span class='hs-varop'>*</span> <span class='hs-varid'>pi</span><span class='hs-layout'>)</span> <span class='hs-varop'>/</span> <span class='hs-varid'>n</span>
<a name="line-72"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tStop</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-num'>2</span> <span class='hs-varop'>*</span> <span class='hs-varid'>pi</span><span class='hs-layout'>)</span> <span class='hs-varop'>+</span> <span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tStep</span><span class='hs-layout'>)</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span>
<a name="line-73"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>r1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>r</span> <span class='hs-comment'>-</span> <span class='hs-varid'>width</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span>
<a name="line-74"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>r2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>r</span> <span class='hs-varop'>+</span> <span class='hs-varid'>width</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span>
<a name="line-75"></a>
<a name="line-76"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>renderPrimitive</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>TriangleStrip</span>
<a name="line-77"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>renderCircleStrip_step</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>tStep</span> <span class='hs-varid'>tStop</span> <span class='hs-varid'>r1</span> <span class='hs-num'>0.0</span><span class='hs-cpp'>#</span> <span class='hs-varid'>r2</span>
<a name="line-78"></a> <span class='hs-layout'>(</span><span class='hs-varid'>tStep</span> <span class='hs-varop'>`</span><span class='hs-varid'>divideFloat</span><span class='hs-cpp'>#</span><span class='hs-varop'>`</span> <span class='hs-num'>2.0</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span>
<a name="line-79"></a><span class='hs-comment'>{-# INLINE renderCircleStrip #-}</span>
<a name="line-80"></a>
<a name="line-81"></a>
<a name="line-82"></a><a name="renderArc"></a><span class='hs-comment'>-- Arc ------------------------------------------------------------------------</span>
<a name="line-83"></a><span class='hs-comment'>-- | Render an arc with the given thickness.</span>
<a name="line-84"></a><span class='hs-definition'>renderArc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-85"></a><span class='hs-definition'>renderArc</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>scaleFactor</span> <span class='hs-varid'>radius_</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-varid'>thickness_</span>
<a name="line-86"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-varid'>abs</span> <span class='hs-varid'>radius_</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>abs</span> <span class='hs-varid'>thickness_</span><span class='hs-layout'>)</span>
<a name="line-87"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>go</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>thickness</span>
<a name="line-88"></a>
<a name="line-89"></a> <span class='hs-comment'>-- Render zero thickness arcs with lines.</span>
<a name="line-90"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>thickness</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span>
<a name="line-91"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>radScreen</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>scaleFactor</span> <span class='hs-varop'>*</span> <span class='hs-varid'>radius</span>
<a name="line-92"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>steps</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>circleSteps</span> <span class='hs-varid'>radScreen</span>
<a name="line-93"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>renderArcLine</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>steps</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span>
<a name="line-94"></a>
<a name="line-95"></a> <span class='hs-comment'>-- Some thick arc.</span>
<a name="line-96"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>radScreen</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>scaleFactor</span> <span class='hs-varop'>*</span> <span class='hs-layout'>(</span><span class='hs-varid'>radius</span> <span class='hs-varop'>+</span> <span class='hs-varid'>thickness</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-97"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>steps</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>circleSteps</span> <span class='hs-varid'>radScreen</span>
<a name="line-98"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>renderArcStrip</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>steps</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-varid'>thickness</span>
<a name="line-99"></a>
<a name="line-100"></a>
<a name="line-101"></a><a name="renderArcLine"></a><span class='hs-comment'>-- | Render an arc as a line.</span>
<a name="line-102"></a><span class='hs-definition'>renderArcLine</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-103"></a><span class='hs-definition'>renderArcLine</span> <span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>posX</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>posY</span><span class='hs-layout'>)</span> <span class='hs-varid'>steps</span> <span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>rad</span><span class='hs-layout'>)</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span>
<a name="line-104"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>steps</span>
<a name="line-105"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tStep</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-num'>2</span> <span class='hs-varop'>*</span> <span class='hs-varid'>pi</span><span class='hs-layout'>)</span> <span class='hs-varop'>/</span> <span class='hs-varid'>n</span>
<a name="line-106"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tStart</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>degToRad</span> <span class='hs-varid'>a1</span>
<a name="line-107"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tStop</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>degToRad</span> <span class='hs-varid'>a2</span> <span class='hs-varop'>+</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>a1</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>a2</span> <span class='hs-keyword'>then</span> <span class='hs-num'>2</span> <span class='hs-varop'>*</span> <span class='hs-varid'>pi</span> <span class='hs-keyword'>else</span> <span class='hs-num'>0</span>
<a name="line-108"></a>
<a name="line-109"></a> <span class='hs-comment'>-- force the line to end at the desired angle</span>
<a name="line-110"></a> <span class='hs-varid'>endVertex</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>addPointOnCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>rad</span> <span class='hs-varid'>tStop</span>
<a name="line-111"></a>
<a name="line-112"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>renderPrimitive</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>LineStrip</span>
<a name="line-113"></a> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>renderCircleLine_step</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>tStep</span> <span class='hs-varid'>tStop</span> <span class='hs-varid'>rad</span> <span class='hs-varid'>tStart</span>
<a name="line-114"></a> <span class='hs-varid'>endVertex</span>
<a name="line-115"></a><span class='hs-comment'>{-# INLINE renderArcLine #-}</span>
<a name="line-116"></a>
<a name="line-117"></a>
<a name="line-118"></a><a name="renderArcStrip"></a><span class='hs-comment'>-- | Render an arc with a given thickness as a triangle strip</span>
<a name="line-119"></a><span class='hs-definition'>renderArcStrip</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-120"></a><span class='hs-definition'>renderArcStrip</span> <span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>posX</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>posY</span><span class='hs-layout'>)</span> <span class='hs-varid'>steps</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-varid'>width</span>
<a name="line-121"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>steps</span>
<a name="line-122"></a> <span class='hs-varid'>tStep</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-num'>2</span> <span class='hs-varop'>*</span> <span class='hs-varid'>pi</span><span class='hs-layout'>)</span> <span class='hs-varop'>/</span> <span class='hs-varid'>n</span>
<a name="line-123"></a>
<a name="line-124"></a> <span class='hs-varid'>t1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>normaliseAngle</span> <span class='hs-varop'>$</span> <span class='hs-varid'>degToRad</span> <span class='hs-varid'>a1</span>
<a name="line-125"></a> <span class='hs-varid'>t2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>normaliseAngle</span> <span class='hs-varop'>$</span> <span class='hs-varid'>degToRad</span> <span class='hs-varid'>a2</span>
<a name="line-126"></a> <span class='hs-layout'>(</span><span class='hs-varid'>tStart</span><span class='hs-layout'>,</span> <span class='hs-varid'>tStop</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>t1</span> <span class='hs-varop'><=</span> <span class='hs-varid'>t2</span> <span class='hs-keyword'>then</span> <span class='hs-layout'>(</span><span class='hs-varid'>t1</span><span class='hs-layout'>,</span> <span class='hs-varid'>t2</span><span class='hs-layout'>)</span> <span class='hs-keyword'>else</span> <span class='hs-layout'>(</span><span class='hs-varid'>t2</span><span class='hs-layout'>,</span> <span class='hs-varid'>t1</span><span class='hs-layout'>)</span>
<a name="line-127"></a> <span class='hs-varid'>tDiff</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tStop</span> <span class='hs-comment'>-</span> <span class='hs-varid'>tStart</span>
<a name="line-128"></a> <span class='hs-varid'>tMid</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tStart</span> <span class='hs-varop'>+</span> <span class='hs-varid'>tDiff</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span>
<a name="line-129"></a>
<a name="line-130"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tStep'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tStep</span>
<a name="line-131"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tStep2'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tStep</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span>
<a name="line-132"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tStart'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tStart</span>
<a name="line-133"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tStop'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tStop</span>
<a name="line-134"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tCut'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tStop</span> <span class='hs-comment'>-</span> <span class='hs-varid'>tStep</span>
<a name="line-135"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tMid'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tMid</span>
<a name="line-136"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>r1'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>r</span> <span class='hs-comment'>-</span> <span class='hs-varid'>width</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span>
<a name="line-137"></a> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>r2'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>r</span> <span class='hs-varop'>+</span> <span class='hs-varid'>width</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span>
<a name="line-138"></a>
<a name="line-139"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>renderPrimitive</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>TriangleStrip</span>
<a name="line-140"></a> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-141"></a> <span class='hs-comment'>-- start vector</span>
<a name="line-142"></a> <span class='hs-varid'>addPointOnCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>r1'</span> <span class='hs-varid'>tStart'</span>
<a name="line-143"></a> <span class='hs-varid'>addPointOnCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>r2'</span> <span class='hs-varid'>tStart'</span>
<a name="line-144"></a>
<a name="line-145"></a> <span class='hs-comment'>-- If we don't have a complete step then just drop a point</span>
<a name="line-146"></a> <span class='hs-comment'>-- between the two ending lines.</span>
<a name="line-147"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>tDiff</span> <span class='hs-varop'><</span> <span class='hs-varid'>tStep</span>
<a name="line-148"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span>
<a name="line-149"></a> <span class='hs-varid'>addPointOnCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>r1'</span> <span class='hs-varid'>tMid'</span>
<a name="line-150"></a>
<a name="line-151"></a> <span class='hs-comment'>-- end vectors</span>
<a name="line-152"></a> <span class='hs-varid'>addPointOnCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>r2'</span> <span class='hs-varid'>tStop'</span>
<a name="line-153"></a> <span class='hs-varid'>addPointOnCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>r1'</span> <span class='hs-varid'>tStop'</span>
<a name="line-154"></a>
<a name="line-155"></a>
<a name="line-156"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span>
<a name="line-157"></a> <span class='hs-varid'>renderCircleStrip_step</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>tStep'</span> <span class='hs-varid'>tCut'</span> <span class='hs-varid'>r1'</span> <span class='hs-varid'>tStart'</span> <span class='hs-varid'>r2'</span>
<a name="line-158"></a> <span class='hs-layout'>(</span><span class='hs-varid'>tStart'</span> <span class='hs-varop'>`</span><span class='hs-varid'>plusFloat</span><span class='hs-cpp'>#</span><span class='hs-varop'>`</span> <span class='hs-varid'>tStep2'</span><span class='hs-layout'>)</span>
<a name="line-159"></a>
<a name="line-160"></a> <span class='hs-comment'>-- end vectors</span>
<a name="line-161"></a> <span class='hs-varid'>addPointOnCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>r1'</span> <span class='hs-varid'>tStop'</span>
<a name="line-162"></a> <span class='hs-varid'>addPointOnCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>r2'</span> <span class='hs-varid'>tStop'</span>
<a name="line-163"></a><span class='hs-comment'>{-# INLINE renderArcStrip #-}</span>
<a name="line-164"></a>
<a name="line-165"></a>
<a name="line-166"></a><a name="renderCircleLine_step"></a><span class='hs-comment'>-- Step functions -------------------------------------------------------------</span>
<a name="line-167"></a><span class='hs-definition'>renderCircleLine_step</span>
<a name="line-168"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span>
<a name="line-169"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span>
<a name="line-170"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span>
<a name="line-171"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-172"></a>
<a name="line-173"></a><span class='hs-definition'>renderCircleLine_step</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>tStep</span> <span class='hs-varid'>tStop</span> <span class='hs-varid'>rad</span> <span class='hs-varid'>tt</span>
<a name="line-174"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>tt</span> <span class='hs-varop'>`</span><span class='hs-varid'>geFloat</span><span class='hs-cpp'>#</span><span class='hs-varop'>`</span> <span class='hs-varid'>tStop</span>
<a name="line-175"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-176"></a>
<a name="line-177"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>
<a name="line-178"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>addPointOnCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>rad</span> <span class='hs-varid'>tt</span>
<a name="line-179"></a> <span class='hs-varid'>renderCircleLine_step</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>tStep</span> <span class='hs-varid'>tStop</span> <span class='hs-varid'>rad</span>
<a name="line-180"></a> <span class='hs-layout'>(</span><span class='hs-varid'>tt</span> <span class='hs-varop'>`</span><span class='hs-varid'>plusFloat</span><span class='hs-cpp'>#</span><span class='hs-varop'>`</span> <span class='hs-varid'>tStep</span><span class='hs-layout'>)</span>
<a name="line-181"></a><span class='hs-comment'>{-# INLINE renderCircleLine_step #-}</span>
<a name="line-182"></a>
<a name="line-183"></a>
<a name="line-184"></a><a name="renderCircleStrip_step"></a><span class='hs-definition'>renderCircleStrip_step</span>
<a name="line-185"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span>
<a name="line-186"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span>
<a name="line-187"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span>
<a name="line-188"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-189"></a>
<a name="line-190"></a><span class='hs-definition'>renderCircleStrip_step</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>tStep</span> <span class='hs-varid'>tStop</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>t1</span> <span class='hs-varid'>r2</span> <span class='hs-varid'>t2</span>
<a name="line-191"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>t1</span> <span class='hs-varop'>`</span><span class='hs-varid'>geFloat</span><span class='hs-cpp'>#</span><span class='hs-varop'>`</span> <span class='hs-varid'>tStop</span>
<a name="line-192"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-193"></a>
<a name="line-194"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>
<a name="line-195"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>addPointOnCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>t1</span>
<a name="line-196"></a> <span class='hs-varid'>addPointOnCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>r2</span> <span class='hs-varid'>t2</span>
<a name="line-197"></a> <span class='hs-varid'>renderCircleStrip_step</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>tStep</span> <span class='hs-varid'>tStop</span> <span class='hs-varid'>r1</span>
<a name="line-198"></a> <span class='hs-layout'>(</span><span class='hs-varid'>t1</span> <span class='hs-varop'>`</span><span class='hs-varid'>plusFloat</span><span class='hs-cpp'>#</span><span class='hs-varop'>`</span> <span class='hs-varid'>tStep</span><span class='hs-layout'>)</span> <span class='hs-varid'>r2</span> <span class='hs-layout'>(</span><span class='hs-varid'>t2</span> <span class='hs-varop'>`</span><span class='hs-varid'>plusFloat</span><span class='hs-cpp'>#</span><span class='hs-varop'>`</span> <span class='hs-varid'>tStep</span><span class='hs-layout'>)</span>
<a name="line-199"></a><span class='hs-comment'>{-# INLINE renderCircleStrip_step #-}</span>
<a name="line-200"></a>
<a name="line-201"></a>
<a name="line-202"></a><a name="addPoint"></a><span class='hs-definition'>addPoint</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-203"></a><span class='hs-definition'>addPoint</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span>
<a name="line-204"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>vertex</span> <span class='hs-varop'>$</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Vertex2</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-layout'>(</span><span class='hs-conid'>F</span><span class='hs-cpp'>#</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-205"></a><span class='hs-comment'>{-# INLINE addPoint #-}</span>
<a name="line-206"></a>
<a name="line-207"></a>
<a name="line-208"></a><a name="addPointOnCircle"></a><span class='hs-definition'>addPointOnCircle</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-209"></a><span class='hs-definition'>addPointOnCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>rad</span> <span class='hs-varid'>tt</span> <span class='hs-keyglyph'>=</span>
<a name="line-210"></a> <span class='hs-varid'>addPoint</span>
<a name="line-211"></a> <span class='hs-layout'>(</span><span class='hs-varid'>posX</span> <span class='hs-varop'>`</span><span class='hs-varid'>plusFloat</span><span class='hs-cpp'>#</span><span class='hs-varop'>`</span> <span class='hs-layout'>(</span><span class='hs-varid'>rad</span> <span class='hs-varop'>`</span><span class='hs-varid'>timesFloat</span><span class='hs-cpp'>#</span><span class='hs-varop'>`</span> <span class='hs-layout'>(</span><span class='hs-varid'>cosFloat</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tt</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-212"></a> <span class='hs-layout'>(</span><span class='hs-varid'>posY</span> <span class='hs-varop'>`</span><span class='hs-varid'>plusFloat</span><span class='hs-cpp'>#</span><span class='hs-varop'>`</span> <span class='hs-layout'>(</span><span class='hs-varid'>rad</span> <span class='hs-varop'>`</span><span class='hs-varid'>timesFloat</span><span class='hs-cpp'>#</span><span class='hs-varop'>`</span> <span class='hs-layout'>(</span><span class='hs-varid'>sinFloat</span><span class='hs-cpp'>#</span> <span class='hs-varid'>tt</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-213"></a><span class='hs-comment'>{-# INLINE addPointOnCircle #-}</span>
<a name="line-214"></a>
<a name="line-215"></a>
<a name="line-216"></a>
<a name="line-217"></a><span class='hs-comment'>{- Unused sector drawing code.
<a name="line-218"></a> Sectors are currently drawn as compound Pictures,
<a name="line-219"></a> but we might want this if we end up implementing the ThickSector
<a name="line-220"></a> version as well.
<a name="line-221"></a>
<a name="line-222"></a>-- | Render a sector as a line.
<a name="line-223"></a>renderSectorLine :: Float -> Float -> Int -> Float -> Float -> Float -> IO ()
<a name="line-224"></a>renderSectorLine pX@(F# posX) pY@(F# posY) steps (F# rad) a1 a2
<a name="line-225"></a> = let n = fromIntegral steps
<a name="line-226"></a> !(F# tStep) = (2 * pi) / n
<a name="line-227"></a> !(F# tStart) = degToRad a1
<a name="line-228"></a> !(F# tStop) = degToRad a2 + if a1 >= a2 then 2 * pi else 0
<a name="line-229"></a>
<a name="line-230"></a> -- need to set up the edges of the start/end triangles
<a name="line-231"></a> startVertex = GL.vertex $ GL.Vertex2 (gf pX) (gf pY)
<a name="line-232"></a> endVertex = addPointOnCircle posX posY rad tStop
<a name="line-233"></a>
<a name="line-234"></a> in GL.renderPrimitive GL.LineLoop
<a name="line-235"></a> $ do startVertex
<a name="line-236"></a> renderCircleLine_step posX posY tStep tStop rad tStart
<a name="line-237"></a> endVertex
<a name="line-238"></a>
<a name="line-239"></a>-- | Render a sector.
<a name="line-240"></a>renderSector :: Float -> Float -> Float -> Float -> Float -> Float -> IO ()
<a name="line-241"></a>renderSector posX posY scaleFactor radius a1 a2
<a name="line-242"></a> | radScreen <- scaleFactor * radius
<a name="line-243"></a> , steps <- circleSteps (2 * radScreen)
<a name="line-244"></a> = renderSectorLine posX posY steps radius a1 a2
<a name="line-245"></a>-}</span>
<a name="line-246"></a>
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