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<title>Graphics/Gloss/Geometry/Angle.hs</title>
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<pre><a name="line-1"></a>
<a name="line-2"></a><span class='hs-comment'>-- | Geometric functions concerning angles. If not otherwise specified, all angles are in radians.</span>
<a name="line-3"></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'>Geometry</span><span class='hs-varop'>.</span><span class='hs-conid'>Angle</span>
<a name="line-4"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>degToRad</span>
<a name="line-5"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>radToDeg</span>
<a name="line-6"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>normaliseAngle</span> <span class='hs-layout'>)</span>
<a name="line-7"></a><span class='hs-keyword'>where</span>
<a name="line-8"></a>
<a name="line-9"></a><a name="degToRad"></a><span class='hs-comment'>-- | Convert degrees to radians</span>
<a name="line-10"></a><span class='hs-comment'>{-# INLINE degToRad #-}</span>
<a name="line-11"></a><span class='hs-definition'>degToRad</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span>
<a name="line-12"></a><span class='hs-definition'>degToRad</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>d</span> <span class='hs-varop'>*</span> <span class='hs-varid'>pi</span> <span class='hs-varop'>/</span> <span class='hs-num'>180</span>
<a name="line-13"></a>
<a name="line-14"></a>
<a name="line-15"></a><a name="radToDeg"></a><span class='hs-comment'>-- | Convert radians to degrees</span>
<a name="line-16"></a><span class='hs-comment'>{-# INLINE radToDeg #-}</span>
<a name="line-17"></a><span class='hs-definition'>radToDeg</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span>
<a name="line-18"></a><span class='hs-definition'>radToDeg</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>r</span> <span class='hs-varop'>*</span> <span class='hs-num'>180</span> <span class='hs-varop'>/</span> <span class='hs-varid'>pi</span>
<a name="line-19"></a>
<a name="line-20"></a>
<a name="line-21"></a><a name="normaliseAngle"></a><span class='hs-comment'>-- | Normalise an angle to be between 0 and 2*pi radians</span>
<a name="line-22"></a><span class='hs-comment'>{-# INLINE normaliseAngle #-}</span>
<a name="line-23"></a><span class='hs-definition'>normaliseAngle</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span>
<a name="line-24"></a><span class='hs-definition'>normaliseAngle</span> <span class='hs-varid'>f</span>
<a name="line-25"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>f</span> <span class='hs-varop'><</span> <span class='hs-num'>0</span>
<a name="line-26"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>normaliseAngle</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>+</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-27"></a>
<a name="line-28"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>f</span> <span class='hs-varop'>></span> <span class='hs-num'>2</span> <span class='hs-varop'>*</span> <span class='hs-varid'>pi</span>
<a name="line-29"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>normaliseAngle</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-comment'>-</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-30"></a>
<a name="line-31"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>
<a name="line-32"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span>
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