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<title>Graphics/Gloss/Internals/Interface/ViewPort/ControlState.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS_HADDOCK hide #-}</span>
<a name="line-2"></a>
<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'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Interface</span><span class='hs-varop'>.</span><span class='hs-conid'>ViewPort</span><span class='hs-varop'>.</span><span class='hs-conid'>ControlState</span>
<a name="line-4"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>State</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-5"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stateInit</span> <span class='hs-layout'>)</span>
<a name="line-6"></a><span class='hs-keyword'>where</span>
<a name="line-7"></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'>Interface</span><span class='hs-varop'>.</span><span class='hs-conid'>ViewPort</span><span class='hs-varop'>.</span><span class='hs-conid'>Command</span>
<a name="line-8"></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'>Interface</span><span class='hs-varop'>.</span><span class='hs-conid'>Backend</span>
<a name="line-9"></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'>Map</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Map</span>
<a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span><span class='hs-layout'>)</span>
<a name="line-11"></a>
<a name="line-12"></a><a name="State"></a><span class='hs-comment'>-- ViewControl State ------------------------------------------------------------------------------</span>
<a name="line-13"></a><a name="State"></a><span class='hs-comment'>-- | State for controlling the viewport.</span>
<a name="line-14"></a><a name="State"></a><span class='hs-comment'>-- These are used by the viewport control component.</span>
<a name="line-15"></a><a name="State"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>State</span>
<a name="line-16"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>State</span> <span class='hs-layout'>{</span>
<a name="line-17"></a> <span class='hs-comment'>-- | The command list for the viewport controller.</span>
<a name="line-18"></a> <span class='hs-comment'>-- These can be safely overwridden at any time by deleting / adding entries to the list.</span>
<a name="line-19"></a> <span class='hs-comment'>-- Entries at the front of the list take precedence.</span>
<a name="line-20"></a> <span class='hs-varid'>stateCommands</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>Map</span> <span class='hs-conid'>Command</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Key</span><span class='hs-layout'>,</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Modifiers</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-21"></a>
<a name="line-22"></a> <span class='hs-comment'>-- | How much to scale the world by for each step of the mouse wheel.</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stateScaleStep</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Float</span>
<a name="line-24"></a>
<a name="line-25"></a> <span class='hs-comment'>-- | How many degrees to rotate the world by for each pixel of x motion.</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stateRotateFactor</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Float</span>
<a name="line-27"></a>
<a name="line-28"></a> <span class='hs-comment'>-- | During viewport translation,</span>
<a name="line-29"></a> <span class='hs-comment'>-- where the mouse was clicked on the window.</span>
<a name="line-30"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stateTranslateMark</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-31"></a>
<a name="line-32"></a> <span class='hs-comment'>-- | During viewport rotation, </span>
<a name="line-33"></a> <span class='hs-comment'>-- where the mouse was clicked on the window</span>
<a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stateRotateMark</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-35"></a> <span class='hs-layout'>}</span>
<a name="line-36"></a>
<a name="line-37"></a>
<a name="line-38"></a><a name="stateInit"></a><span class='hs-comment'>-- | The initial view state.</span>
<a name="line-39"></a><span class='hs-definition'>stateInit</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>State</span>
<a name="line-40"></a><span class='hs-definition'>stateInit</span>
<a name="line-41"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>State</span>
<a name="line-42"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>stateCommands</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-varid'>defaultCommandConfig</span>
<a name="line-43"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stateScaleStep</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0.85</span>
<a name="line-44"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stateRotateFactor</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0.6</span>
<a name="line-45"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stateTranslateMark</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-46"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stateRotateMark</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>}</span>
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