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<pre><a name="line-1"></a><span class='hs-comment'>{-
<a name="line-2"></a>Copyright (c) 2008
<a name="line-3"></a>Russell O'Connor
<a name="line-4"></a>
<a name="line-5"></a>Permission is hereby granted, free of charge, to any person obtaining a copy
<a name="line-6"></a>of this software and associated documentation files (the "Software"), to deal
<a name="line-7"></a>in the Software without restriction, including without limitation the rights
<a name="line-8"></a>to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
<a name="line-9"></a>copies of the Software, and to permit persons to whom the Software is
<a name="line-10"></a>furnished to do so, subject to the following conditions:
<a name="line-11"></a>
<a name="line-12"></a>The above copyright notice and this permission notice shall be included in
<a name="line-13"></a>all copies or substantial portions of the Software.
<a name="line-14"></a>
<a name="line-15"></a>THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
<a name="line-16"></a>IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
<a name="line-17"></a>FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
<a name="line-18"></a>AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
<a name="line-19"></a>LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
<a name="line-20"></a>OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
<a name="line-21"></a>THE SOFTWARE.
<a name="line-22"></a>-}</span>
<a name="line-23"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Colour</span><span class='hs-varop'>.</span><span class='hs-conid'>Chan</span> <span class='hs-keyword'>where</span>
<a name="line-24"></a><span class='hs-comment'>{- For internal use only:
<a name="line-25"></a> Not to be exported from the package -}</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-layout'>(</span><span class='hs-varid'>sum</span><span class='hs-layout'>)</span>
<a name="line-28"></a>
<a name="line-29"></a><a name="Chan"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>Chan</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Chan</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>)</span>
<a name="line-30"></a>
<a name="line-31"></a><a name="empty"></a><span class='hs-definition'>empty</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Num</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Chan</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span>
<a name="line-32"></a><span class='hs-definition'>empty</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Chan</span> <span class='hs-num'>0</span>
<a name="line-33"></a>
<a name="line-34"></a><a name="full"></a><span class='hs-definition'>full</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Num</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Chan</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span>
<a name="line-35"></a><span class='hs-definition'>full</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Chan</span> <span class='hs-num'>1</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="scale"></a><span class='hs-definition'>scale</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Num</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Chan</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Chan</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span>
<a name="line-38"></a><span class='hs-definition'>scale</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>Chan</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Chan</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-varop'>*</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="add"></a><span class='hs-definition'>add</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Num</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Chan</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Chan</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Chan</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span>
<a name="line-41"></a><a name="add"></a><span class='hs-layout'>(</span><span class='hs-conid'>Chan</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varop'>`add`</span> <span class='hs-layout'>(</span><span class='hs-conid'>Chan</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Chan</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-varop'>+</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="invert"></a><span class='hs-definition'>invert</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Num</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Chan</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Chan</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span>
<a name="line-44"></a><span class='hs-definition'>invert</span> <span class='hs-layout'>(</span><span class='hs-conid'>Chan</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Chan</span> <span class='hs-layout'>(</span><span class='hs-num'>1</span><span class='hs-comment'>-</span><span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="over"></a><span class='hs-definition'>over</span> <span class='hs-varid'>c0</span> <span class='hs-varid'>a</span> <span class='hs-varid'>c1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c0</span> <span class='hs-varop'>`add`</span> <span class='hs-varid'>scale</span> <span class='hs-layout'>(</span><span class='hs-num'>1</span><span class='hs-comment'>-</span><span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>c1</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="convert"></a><span class='hs-definition'>convert</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Fractional</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-conid'>Real</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Chan</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Chan</span> <span class='hs-varid'>p</span> <span class='hs-varid'>b</span>
<a name="line-49"></a><span class='hs-definition'>convert</span> <span class='hs-layout'>(</span><span class='hs-conid'>Chan</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Chan</span> <span class='hs-layout'>(</span><span class='hs-varid'>realToFrac</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="sum"></a><span class='hs-definition'>sum</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Num</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Chan</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Chan</span> <span class='hs-varid'>p</span> <span class='hs-varid'>a</span>
<a name="line-52"></a><span class='hs-definition'>sum</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Chan</span> <span class='hs-layout'>(</span><span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-varid'>sum</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>|</span><span class='hs-conid'>Chan</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>l</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
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