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<title>Graphics/Gloss/Internals/Interface/ViewPort.hs</title>
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<pre><a name="line-1"></a>
<a name="line-2"></a><span class='hs-comment'>-- | The 'ViewPort' represents the global transformation applied to the displayed picture.</span>
<a name="line-3"></a><span class='hs-comment'>-- When the user pans, zooms, or rotates the display then this changes the 'ViewPort'.</span>
<a name="line-4"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Interface</span><span class='hs-varop'>.</span><span class='hs-conid'>ViewPort</span>
<a name="line-5"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>ViewPort</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-6"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>viewPortInit</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="ViewPort"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ViewPort</span>
<a name="line-10"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ViewPort</span> <span class='hs-layout'>{</span>
<a name="line-11"></a> <span class='hs-comment'>-- | Global translation.</span>
<a name="line-12"></a> <span class='hs-varid'>viewPortTranslate</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</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-13"></a>
<a name="line-14"></a> <span class='hs-comment'>-- | Global rotation (in degrees).</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>viewPortRotate</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Float</span>
<a name="line-16"></a>
<a name="line-17"></a> <span class='hs-comment'>-- | Global scaling (of both x and y coordinates).</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>viewPortScale</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Float</span>
<a name="line-19"></a> <span class='hs-layout'>}</span>
<a name="line-20"></a>
<a name="line-21"></a>
<a name="line-22"></a><a name="viewPortInit"></a><span class='hs-comment'>-- | The initial state of the viewport.</span>
<a name="line-23"></a><span class='hs-definition'>viewPortInit</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ViewPort</span>
<a name="line-24"></a><span class='hs-definition'>viewPortInit</span>
<a name="line-25"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ViewPort</span>
<a name="line-26"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>viewPortTranslate</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>viewPortRotate</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span>
<a name="line-28"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>viewPortScale</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>1</span>
<a name="line-29"></a> <span class='hs-layout'>}</span>
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