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<title>Graphics/Gloss/Data/Color.hs</title>
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<pre><a name="line-1"></a>
<a name="line-2"></a><span class='hs-comment'>-- | Predefined and custom colors.</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'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Color</span>
<a name="line-4"></a> <span class='hs-layout'>(</span>
<a name="line-5"></a> <span class='hs-comment'>-- ** Color data type</span>
<a name="line-6"></a> <span class='hs-conid'>Color</span>
<a name="line-7"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>makeColor</span>
<a name="line-8"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>makeColor'</span>
<a name="line-9"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>makeColor8</span>
<a name="line-10"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>rawColor</span>
<a name="line-11"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>rgbaOfColor</span>
<a name="line-12"></a>
<a name="line-13"></a> <span class='hs-comment'>-- ** Color functions</span>
<a name="line-14"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mixColors</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>addColors</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>dim</span><span class='hs-layout'>,</span> <span class='hs-varid'>bright</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>light</span><span class='hs-layout'>,</span> <span class='hs-varid'>dark</span>
<a name="line-18"></a>
<a name="line-19"></a> <span class='hs-comment'>-- ** Pre-defined colors</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>greyN</span><span class='hs-layout'>,</span> <span class='hs-varid'>black</span><span class='hs-layout'>,</span> <span class='hs-varid'>white</span>
<a name="line-21"></a> <span class='hs-comment'>-- *** Primary</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>red</span><span class='hs-layout'>,</span> <span class='hs-varid'>green</span><span class='hs-layout'>,</span> <span class='hs-varid'>blue</span>
<a name="line-23"></a> <span class='hs-comment'>-- *** Secondary</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>yellow</span><span class='hs-layout'>,</span> <span class='hs-varid'>cyan</span><span class='hs-layout'>,</span> <span class='hs-varid'>magenta</span>
<a name="line-25"></a>
<a name="line-26"></a> <span class='hs-comment'>-- *** Tertiary</span>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>rose</span><span class='hs-layout'>,</span> <span class='hs-varid'>violet</span><span class='hs-layout'>,</span> <span class='hs-varid'>azure</span><span class='hs-layout'>,</span> <span class='hs-varid'>aquamarine</span><span class='hs-layout'>,</span> <span class='hs-varid'>chartreuse</span><span class='hs-layout'>,</span> <span class='hs-varid'>orange</span>
<a name="line-28"></a> <span class='hs-layout'>)</span>
<a name="line-29"></a><span class='hs-keyword'>where</span>
<a name="line-30"></a>
<a name="line-31"></a><a name="Color"></a><span class='hs-comment'>-- | An abstract color value.</span>
<a name="line-32"></a><a name="Color"></a><span class='hs-comment'>-- We keep the type abstract so we can be sure that the components</span>
<a name="line-33"></a><a name="Color"></a><span class='hs-comment'>-- are in the required range. To make a custom color use 'makeColor'.</span>
<a name="line-34"></a><a name="Color"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Color</span>
<a name="line-35"></a> <span class='hs-comment'>-- | Holds the color components. All components lie in the range [0..1.</span>
<a name="line-36"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span> <span class='hs-varop'>!</span><span class='hs-conid'>Float</span> <span class='hs-varop'>!</span><span class='hs-conid'>Float</span> <span class='hs-varop'>!</span><span class='hs-conid'>Float</span> <span class='hs-varop'>!</span><span class='hs-conid'>Float</span>
<a name="line-37"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>)</span>
<a name="line-38"></a>
<a name="line-39"></a>
<a name="line-40"></a><a name="instance%20Num%20Color"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Num</span> <span class='hs-conid'>Color</span> <span class='hs-keyword'>where</span>
<a name="line-41"></a> <span class='hs-comment'>{-# INLINE (+) #-}</span>
<a name="line-42"></a> <span class='hs-layout'>(</span><span class='hs-varop'>+</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>RGBA</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>g1</span> <span class='hs-varid'>b1</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>RGBA</span> <span class='hs-varid'>r2</span> <span class='hs-varid'>g2</span> <span class='hs-varid'>b2</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span>
<a name="line-43"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span> <span class='hs-layout'>(</span><span class='hs-varid'>r1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>r2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>g1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>g2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>b1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>b2</span><span class='hs-layout'>)</span> <span class='hs-num'>1</span>
<a name="line-44"></a>
<a name="line-45"></a> <span class='hs-comment'>{-# INLINE (-) #-}</span>
<a name="line-46"></a> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>RGBA</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>g1</span> <span class='hs-varid'>b1</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>RGBA</span> <span class='hs-varid'>r2</span> <span class='hs-varid'>g2</span> <span class='hs-varid'>b2</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span>
<a name="line-47"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span> <span class='hs-layout'>(</span><span class='hs-varid'>r1</span> <span class='hs-comment'>-</span> <span class='hs-varid'>r2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>g1</span> <span class='hs-comment'>-</span> <span class='hs-varid'>g2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>b1</span> <span class='hs-comment'>-</span> <span class='hs-varid'>b2</span><span class='hs-layout'>)</span> <span class='hs-num'>1</span>
<a name="line-48"></a>
<a name="line-49"></a> <span class='hs-comment'>{-# INLINE (*) #-}</span>
<a name="line-50"></a> <span class='hs-layout'>(</span><span class='hs-varop'>*</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>RGBA</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>g1</span> <span class='hs-varid'>b1</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>RGBA</span> <span class='hs-varid'>r2</span> <span class='hs-varid'>g2</span> <span class='hs-varid'>b2</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span>
<a name="line-51"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span> <span class='hs-layout'>(</span><span class='hs-varid'>r1</span> <span class='hs-varop'>*</span> <span class='hs-varid'>r2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>g1</span> <span class='hs-varop'>*</span> <span class='hs-varid'>g2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>b1</span> <span class='hs-varop'>*</span> <span class='hs-varid'>b2</span><span class='hs-layout'>)</span> <span class='hs-num'>1</span>
<a name="line-52"></a>
<a name="line-53"></a> <span class='hs-comment'>{-# INLINE abs #-}</span>
<a name="line-54"></a> <span class='hs-varid'>abs</span> <span class='hs-layout'>(</span><span class='hs-conid'>RGBA</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>g1</span> <span class='hs-varid'>b1</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span>
<a name="line-55"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span> <span class='hs-layout'>(</span><span class='hs-varid'>abs</span> <span class='hs-varid'>r1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>abs</span> <span class='hs-varid'>g1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>abs</span> <span class='hs-varid'>b1</span><span class='hs-layout'>)</span> <span class='hs-num'>1</span>
<a name="line-56"></a>
<a name="line-57"></a> <span class='hs-comment'>{-# INLINE signum #-}</span>
<a name="line-58"></a> <span class='hs-varid'>signum</span> <span class='hs-layout'>(</span><span class='hs-conid'>RGBA</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>g1</span> <span class='hs-varid'>b1</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span>
<a name="line-59"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span> <span class='hs-layout'>(</span><span class='hs-varid'>signum</span> <span class='hs-varid'>r1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>signum</span> <span class='hs-varid'>g1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>signum</span> <span class='hs-varid'>b1</span><span class='hs-layout'>)</span> <span class='hs-num'>1</span>
<a name="line-60"></a>
<a name="line-61"></a> <span class='hs-comment'>{-# INLINE fromInteger #-}</span>
<a name="line-62"></a> <span class='hs-varid'>fromInteger</span> <span class='hs-varid'>i</span>
<a name="line-63"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromInteger</span> <span class='hs-varid'>i</span>
<a name="line-64"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>RGBA</span> <span class='hs-varid'>f</span> <span class='hs-varid'>f</span> <span class='hs-varid'>f</span> <span class='hs-num'>1</span>
<a name="line-65"></a>
<a name="line-66"></a>
<a name="line-67"></a><a name="makeColor"></a><span class='hs-comment'>-- | Make a custom color. All components are clamped to the range [0..1].</span>
<a name="line-68"></a><span class='hs-definition'>makeColor</span>
<a name="line-69"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-comment'>-- ^ Red component.</span>
<a name="line-70"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-comment'>-- ^ Green component.</span>
<a name="line-71"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-comment'>-- ^ Blue component.</span>
<a name="line-72"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-comment'>-- ^ Alpha component.</span>
<a name="line-73"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span>
<a name="line-74"></a>
<a name="line-75"></a><span class='hs-definition'>makeColor</span> <span class='hs-varid'>r</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span>
<a name="line-76"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>clampColor</span>
<a name="line-77"></a> <span class='hs-varop'>$</span> <span class='hs-conid'>RGBA</span> <span class='hs-varid'>r</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span>
<a name="line-78"></a><span class='hs-comment'>{-# INLINE makeColor #-}</span>
<a name="line-79"></a>
<a name="line-80"></a>
<a name="line-81"></a><a name="makeColor'"></a><span class='hs-comment'>-- | Make a custom color. </span>
<a name="line-82"></a><span class='hs-comment'>-- You promise that all components are clamped to the range [0..1]</span>
<a name="line-83"></a><span class='hs-definition'>makeColor'</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'>Color</span>
<a name="line-84"></a><span class='hs-definition'>makeColor'</span> <span class='hs-varid'>r</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span>
<a name="line-85"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span> <span class='hs-varid'>r</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span>
<a name="line-86"></a><span class='hs-comment'>{-# INLINE makeColor' #-}</span>
<a name="line-87"></a>
<a name="line-88"></a>
<a name="line-89"></a><a name="makeColor8"></a><span class='hs-comment'>-- | Make a custom color. All components are clamped to the range [0..255].</span>
<a name="line-90"></a><span class='hs-definition'>makeColor8</span>
<a name="line-91"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Red component.</span>
<a name="line-92"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Green component.</span>
<a name="line-93"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Blue component.</span>
<a name="line-94"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Alpha component.</span>
<a name="line-95"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span>
<a name="line-96"></a>
<a name="line-97"></a><span class='hs-definition'>makeColor8</span> <span class='hs-varid'>r</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span>
<a name="line-98"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>clampColor</span>
<a name="line-99"></a> <span class='hs-varop'>$</span> <span class='hs-conid'>RGBA</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>r</span> <span class='hs-varop'>/</span> <span class='hs-num'>255</span><span class='hs-layout'>)</span>
<a name="line-100"></a> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>g</span> <span class='hs-varop'>/</span> <span class='hs-num'>255</span><span class='hs-layout'>)</span>
<a name="line-101"></a> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>b</span> <span class='hs-varop'>/</span> <span class='hs-num'>255</span><span class='hs-layout'>)</span>
<a name="line-102"></a> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>a</span> <span class='hs-varop'>/</span> <span class='hs-num'>255</span><span class='hs-layout'>)</span>
<a name="line-103"></a><span class='hs-comment'>{-# INLINE makeColor8 #-}</span>
<a name="line-104"></a>
<a name="line-105"></a>
<a name="line-106"></a><a name="rgbaOfColor"></a><span class='hs-comment'>-- | Take the RGBA components of a color.</span>
<a name="line-107"></a><span class='hs-definition'>rgbaOfColor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Color</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Float</span><span class='hs-layout'>,</span> <span class='hs-conid'>Float</span><span class='hs-layout'>,</span> <span class='hs-conid'>Float</span><span class='hs-layout'>,</span> <span class='hs-conid'>Float</span><span class='hs-layout'>)</span>
<a name="line-108"></a><span class='hs-definition'>rgbaOfColor</span> <span class='hs-layout'>(</span><span class='hs-conid'>RGBA</span> <span class='hs-varid'>r</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>g</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-109"></a><span class='hs-comment'>{-# INLINE rgbaOfColor #-}</span>
<a name="line-110"></a>
<a name="line-111"></a>
<a name="line-112"></a><a name="rawColor"></a><span class='hs-comment'>-- | Make a custom color.</span>
<a name="line-113"></a><span class='hs-comment'>-- Components should be in the range [0..1] but this is not checked.</span>
<a name="line-114"></a><span class='hs-definition'>rawColor</span>
<a name="line-115"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-comment'>-- ^ Red component.</span>
<a name="line-116"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-comment'>-- ^ Green component.</span>
<a name="line-117"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-comment'>-- ^ Blue component.</span>
<a name="line-118"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-comment'>-- ^ Alpha component.</span>
<a name="line-119"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span>
<a name="line-120"></a>
<a name="line-121"></a><span class='hs-definition'>rawColor</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span>
<a name="line-122"></a><span class='hs-comment'>{-# INLINE rawColor #-}</span>
<a name="line-123"></a>
<a name="line-124"></a>
<a name="line-125"></a><span class='hs-comment'>-- Internal </span>
<a name="line-126"></a>
<a name="line-127"></a><a name="clampColor"></a><span class='hs-comment'>-- | Clamp components of a color into the required range.</span>
<a name="line-128"></a><span class='hs-definition'>clampColor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Color</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span>
<a name="line-129"></a><span class='hs-definition'>clampColor</span> <span class='hs-varid'>cc</span>
<a name="line-130"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>g</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rgbaOfColor</span> <span class='hs-varid'>cc</span>
<a name="line-131"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>RGBA</span> <span class='hs-layout'>(</span><span class='hs-varid'>min</span> <span class='hs-num'>1</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>min</span> <span class='hs-num'>1</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>min</span> <span class='hs-num'>1</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>min</span> <span class='hs-num'>1</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-132"></a>
<a name="line-133"></a><a name="normaliseColor"></a><span class='hs-comment'>-- | Normalise a color to the value of its largest RGB component.</span>
<a name="line-134"></a><span class='hs-definition'>normaliseColor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Color</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span>
<a name="line-135"></a><span class='hs-definition'>normaliseColor</span> <span class='hs-varid'>cc</span>
<a name="line-136"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>g</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rgbaOfColor</span> <span class='hs-varid'>cc</span>
<a name="line-137"></a> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maximum</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>g</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span>
<a name="line-138"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>RGBA</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varop'>/</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-varop'>/</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-varop'>/</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-139"></a>
<a name="line-140"></a>
<a name="line-141"></a><span class='hs-comment'>-- Color functions ------------------------------------------------------------</span>
<a name="line-142"></a>
<a name="line-143"></a><a name="mixColors"></a><span class='hs-comment'>-- | Mix two colors with the given ratios.</span>
<a name="line-144"></a><span class='hs-definition'>mixColors</span>
<a name="line-145"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-comment'>-- ^ Ratio of first color.</span>
<a name="line-146"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Float</span> <span class='hs-comment'>-- ^ Ratio of second color.</span>
<a name="line-147"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span> <span class='hs-comment'>-- ^ First color.</span>
<a name="line-148"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span> <span class='hs-comment'>-- ^ Second color.</span>
<a name="line-149"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span> <span class='hs-comment'>-- ^ Resulting color.</span>
<a name="line-150"></a>
<a name="line-151"></a><span class='hs-definition'>mixColors</span> <span class='hs-varid'>ratio1</span> <span class='hs-varid'>ratio2</span> <span class='hs-varid'>c1</span> <span class='hs-varid'>c2</span>
<a name="line-152"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-conid'>RGBA</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>g1</span> <span class='hs-varid'>b1</span> <span class='hs-varid'>a1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c1</span>
<a name="line-153"></a> <span class='hs-conid'>RGBA</span> <span class='hs-varid'>r2</span> <span class='hs-varid'>g2</span> <span class='hs-varid'>b2</span> <span class='hs-varid'>a2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c2</span>
<a name="line-154"></a>
<a name="line-155"></a> <span class='hs-varid'>total</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ratio1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>ratio2</span>
<a name="line-156"></a> <span class='hs-varid'>m1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ratio1</span> <span class='hs-varop'>/</span> <span class='hs-varid'>total</span>
<a name="line-157"></a> <span class='hs-varid'>m2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ratio2</span> <span class='hs-varop'>/</span> <span class='hs-varid'>total</span>
<a name="line-158"></a>
<a name="line-159"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>RGBA</span> <span class='hs-layout'>(</span><span class='hs-varid'>m1</span> <span class='hs-varop'>*</span> <span class='hs-varid'>r1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>m2</span> <span class='hs-varop'>*</span> <span class='hs-varid'>r2</span><span class='hs-layout'>)</span>
<a name="line-160"></a> <span class='hs-layout'>(</span><span class='hs-varid'>m1</span> <span class='hs-varop'>*</span> <span class='hs-varid'>g1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>m2</span> <span class='hs-varop'>*</span> <span class='hs-varid'>g2</span><span class='hs-layout'>)</span>
<a name="line-161"></a> <span class='hs-layout'>(</span><span class='hs-varid'>m1</span> <span class='hs-varop'>*</span> <span class='hs-varid'>b1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>m2</span> <span class='hs-varop'>*</span> <span class='hs-varid'>b2</span><span class='hs-layout'>)</span>
<a name="line-162"></a> <span class='hs-layout'>(</span><span class='hs-varid'>m1</span> <span class='hs-varop'>*</span> <span class='hs-varid'>a1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>m2</span> <span class='hs-varop'>*</span> <span class='hs-varid'>a2</span><span class='hs-layout'>)</span>
<a name="line-163"></a>
<a name="line-164"></a>
<a name="line-165"></a><a name="addColors"></a><span class='hs-comment'>-- | Add RGB components of a color component-wise, then normalise</span>
<a name="line-166"></a><span class='hs-comment'>-- them to the highest resulting one. The alpha components are averaged.</span>
<a name="line-167"></a><span class='hs-definition'>addColors</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Color</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span>
<a name="line-168"></a><span class='hs-definition'>addColors</span> <span class='hs-varid'>c1</span> <span class='hs-varid'>c2</span>
<a name="line-169"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-conid'>RGBA</span> <span class='hs-varid'>r1</span> <span class='hs-varid'>g1</span> <span class='hs-varid'>b1</span> <span class='hs-varid'>a1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c1</span>
<a name="line-170"></a> <span class='hs-conid'>RGBA</span> <span class='hs-varid'>r2</span> <span class='hs-varid'>g2</span> <span class='hs-varid'>b2</span> <span class='hs-varid'>a2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c2</span>
<a name="line-171"></a>
<a name="line-172"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>normaliseColor</span>
<a name="line-173"></a> <span class='hs-varop'>$</span> <span class='hs-conid'>RGBA</span> <span class='hs-layout'>(</span><span class='hs-varid'>r1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>r2</span><span class='hs-layout'>)</span>
<a name="line-174"></a> <span class='hs-layout'>(</span><span class='hs-varid'>g1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>g2</span><span class='hs-layout'>)</span>
<a name="line-175"></a> <span class='hs-layout'>(</span><span class='hs-varid'>b1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>b2</span><span class='hs-layout'>)</span>
<a name="line-176"></a> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>a1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>a2</span><span class='hs-layout'>)</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-177"></a>
<a name="line-178"></a>
<a name="line-179"></a><a name="dim"></a><span class='hs-comment'>-- | Make a dimmer version of a color, scaling towards black.</span>
<a name="line-180"></a><span class='hs-definition'>dim</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Color</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span>
<a name="line-181"></a><span class='hs-definition'>dim</span> <span class='hs-layout'>(</span><span class='hs-conid'>RGBA</span> <span class='hs-varid'>r</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-182"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varop'>/</span> <span class='hs-num'>1.2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-varop'>/</span> <span class='hs-num'>1.2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-varop'>/</span> <span class='hs-num'>1.2</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-183"></a>
<a name="line-184"></a>
<a name="line-185"></a><a name="bright"></a><span class='hs-comment'>-- | Make a brighter version of a color, scaling towards white.</span>
<a name="line-186"></a><span class='hs-definition'>bright</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Color</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span>
<a name="line-187"></a><span class='hs-definition'>bright</span> <span class='hs-layout'>(</span><span class='hs-conid'>RGBA</span> <span class='hs-varid'>r</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-188"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>clampColor</span>
<a name="line-189"></a> <span class='hs-varop'>$</span> <span class='hs-conid'>RGBA</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varop'>*</span> <span class='hs-num'>1.2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-varop'>*</span> <span class='hs-num'>1.2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-varop'>*</span> <span class='hs-num'>1.2</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-190"></a>
<a name="line-191"></a>
<a name="line-192"></a><a name="light"></a><span class='hs-comment'>-- | Lighten a color, adding white.</span>
<a name="line-193"></a><span class='hs-definition'>light</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Color</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span>
<a name="line-194"></a><span class='hs-definition'>light</span> <span class='hs-layout'>(</span><span class='hs-conid'>RGBA</span> <span class='hs-varid'>r</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-195"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>clampColor</span>
<a name="line-196"></a> <span class='hs-varop'>$</span> <span class='hs-conid'>RGBA</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varop'>+</span> <span class='hs-num'>0.2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-varop'>+</span> <span class='hs-num'>0.2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-varop'>+</span> <span class='hs-num'>0.2</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-197"></a>
<a name="line-198"></a>
<a name="line-199"></a><a name="dark"></a><span class='hs-comment'>-- | Darken a color, adding black.</span>
<a name="line-200"></a><span class='hs-definition'>dark</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Color</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span>
<a name="line-201"></a><span class='hs-definition'>dark</span> <span class='hs-layout'>(</span><span class='hs-conid'>RGBA</span> <span class='hs-varid'>r</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-202"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>clampColor</span>
<a name="line-203"></a> <span class='hs-varop'>$</span> <span class='hs-conid'>RGBA</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-comment'>-</span> <span class='hs-num'>0.2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>g</span> <span class='hs-comment'>-</span> <span class='hs-num'>0.2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-comment'>-</span> <span class='hs-num'>0.2</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-204"></a>
<a name="line-205"></a>
<a name="line-206"></a><a name="greyN"></a><span class='hs-comment'>-- Pre-defined Colors ---------------------------------------------------------</span>
<a name="line-207"></a><span class='hs-comment'>-- | A greyness of a given magnitude.</span>
<a name="line-208"></a><span class='hs-definition'>greyN</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Float</span> <span class='hs-comment'>-- ^ Range is 0 = black, to 1 = white.</span>
<a name="line-209"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Color</span>
<a name="line-210"></a><span class='hs-definition'>greyN</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span> <span class='hs-varid'>n</span> <span class='hs-varid'>n</span> <span class='hs-varid'>n</span> <span class='hs-num'>1.0</span>
<a name="line-211"></a>
<a name="line-212"></a><a name="black"></a><span class='hs-definition'>black</span><span class='hs-layout'>,</span> <span class='hs-varid'>white</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Color</span>
<a name="line-213"></a><span class='hs-definition'>black</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span> <span class='hs-num'>0.0</span> <span class='hs-num'>0.0</span> <span class='hs-num'>0.0</span> <span class='hs-num'>1.0</span>
<a name="line-214"></a><a name="white"></a><span class='hs-definition'>white</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span> <span class='hs-num'>1.0</span> <span class='hs-num'>1.0</span> <span class='hs-num'>1.0</span> <span class='hs-num'>1.0</span>
<a name="line-215"></a>
<a name="line-216"></a><a name="red"></a><span class='hs-comment'>-- Colors from the additive color wheel.</span>
<a name="line-217"></a><span class='hs-definition'>red</span><span class='hs-layout'>,</span> <span class='hs-varid'>green</span><span class='hs-layout'>,</span> <span class='hs-varid'>blue</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Color</span>
<a name="line-218"></a><span class='hs-definition'>red</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span> <span class='hs-num'>1.0</span> <span class='hs-num'>0.0</span> <span class='hs-num'>0.0</span> <span class='hs-num'>1.0</span>
<a name="line-219"></a><a name="green"></a><span class='hs-definition'>green</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span> <span class='hs-num'>0.0</span> <span class='hs-num'>1.0</span> <span class='hs-num'>0.0</span> <span class='hs-num'>1.0</span>
<a name="line-220"></a><a name="blue"></a><span class='hs-definition'>blue</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGBA</span> <span class='hs-num'>0.0</span> <span class='hs-num'>0.0</span> <span class='hs-num'>1.0</span> <span class='hs-num'>1.0</span>
<a name="line-221"></a>
<a name="line-222"></a><a name="yellow"></a><span class='hs-comment'>-- secondary</span>
<a name="line-223"></a><span class='hs-definition'>yellow</span><span class='hs-layout'>,</span> <span class='hs-varid'>cyan</span><span class='hs-layout'>,</span> <span class='hs-varid'>magenta</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Color</span>
<a name="line-224"></a><span class='hs-definition'>yellow</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>addColors</span> <span class='hs-varid'>red</span> <span class='hs-varid'>green</span>
<a name="line-225"></a><a name="cyan"></a><span class='hs-definition'>cyan</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>addColors</span> <span class='hs-varid'>green</span> <span class='hs-varid'>blue</span>
<a name="line-226"></a><a name="magenta"></a><span class='hs-definition'>magenta</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>addColors</span> <span class='hs-varid'>red</span> <span class='hs-varid'>blue</span>
<a name="line-227"></a>
<a name="line-228"></a><a name="rose"></a><span class='hs-comment'>-- tertiary</span>
<a name="line-229"></a><span class='hs-definition'>rose</span><span class='hs-layout'>,</span> <span class='hs-varid'>violet</span><span class='hs-layout'>,</span> <span class='hs-varid'>azure</span><span class='hs-layout'>,</span> <span class='hs-varid'>aquamarine</span><span class='hs-layout'>,</span> <span class='hs-varid'>chartreuse</span><span class='hs-layout'>,</span> <span class='hs-varid'>orange</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Color</span>
<a name="line-230"></a><span class='hs-definition'>rose</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>addColors</span> <span class='hs-varid'>red</span> <span class='hs-varid'>magenta</span>
<a name="line-231"></a><a name="violet"></a><span class='hs-definition'>violet</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>addColors</span> <span class='hs-varid'>magenta</span> <span class='hs-varid'>blue</span>
<a name="line-232"></a><a name="azure"></a><span class='hs-definition'>azure</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>addColors</span> <span class='hs-varid'>blue</span> <span class='hs-varid'>cyan</span>
<a name="line-233"></a><a name="aquamarine"></a><span class='hs-definition'>aquamarine</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>addColors</span> <span class='hs-varid'>cyan</span> <span class='hs-varid'>green</span>
<a name="line-234"></a><a name="chartreuse"></a><span class='hs-definition'>chartreuse</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>addColors</span> <span class='hs-varid'>green</span> <span class='hs-varid'>yellow</span>
<a name="line-235"></a><a name="orange"></a><span class='hs-definition'>orange</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>addColors</span> <span class='hs-varid'>yellow</span> <span class='hs-varid'>red</span>
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