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<title>Graphics/Rendering/Chart/State.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE TemplateHaskell, FlexibleInstances #-}</span>
<a name="line-2"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>Chart</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span><span class='hs-layout'>(</span>
<a name="line-3"></a> <span class='hs-varid'>plot</span><span class='hs-layout'>,</span>
<a name="line-4"></a> <span class='hs-varid'>plotLeft</span><span class='hs-layout'>,</span>
<a name="line-5"></a> <span class='hs-varid'>plotRight</span><span class='hs-layout'>,</span>
<a name="line-6"></a>
<a name="line-7"></a> <span class='hs-varid'>takeColor</span><span class='hs-layout'>,</span>
<a name="line-8"></a> <span class='hs-varid'>takeShape</span><span class='hs-layout'>,</span>
<a name="line-9"></a>
<a name="line-10"></a> <span class='hs-conid'>CState</span><span class='hs-layout'>,</span>
<a name="line-11"></a> <span class='hs-varid'>colors</span><span class='hs-layout'>,</span>
<a name="line-12"></a> <span class='hs-varid'>shapes</span><span class='hs-layout'>,</span>
<a name="line-13"></a>
<a name="line-14"></a> <span class='hs-conid'>EC</span><span class='hs-layout'>,</span>
<a name="line-15"></a> <span class='hs-varid'>execEC</span><span class='hs-layout'>,</span>
<a name="line-16"></a> <span class='hs-varid'>liftEC</span><span class='hs-layout'>,</span>
<a name="line-17"></a> <span class='hs-varid'>liftCState</span><span class='hs-layout'>,</span>
<a name="line-18"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-19"></a>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Default</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Colour</span>
<a name="line-25"></a><span class='hs-keyword'>import</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'>Names</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>Chart</span><span class='hs-varop'>.</span><span class='hs-conid'>Layout</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>Chart</span><span class='hs-varop'>.</span><span class='hs-conid'>Plot</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>Chart</span><span class='hs-varop'>.</span><span class='hs-conid'>Drawing</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>Chart</span><span class='hs-varop'>.</span><span class='hs-conid'>Renderable</span>
<a name="line-31"></a>
<a name="line-32"></a><a name="CState"></a><span class='hs-comment'>-- | The state held when monadically constructing a graphical element</span>
<a name="line-33"></a><a name="CState"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>CState</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CState</span> <span class='hs-layout'>{</span>
<a name="line-34"></a> <span class='hs-sel'>_colors</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>AlphaColour</span> <span class='hs-conid'>Double</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- ^ An infinite source of colors, for use in plots</span>
<a name="line-35"></a> <span class='hs-sel'>_shapes</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>PointShape</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ An infinite source of shapes, for use in plots</span>
<a name="line-36"></a> <span class='hs-layout'>}</span>
<a name="line-37"></a>
<a name="line-38"></a><span class='hs-varop'>$</span><span class='hs-layout'>(</span> <span class='hs-varid'>makeLenses</span> <span class='hs-chr'>'</span><span class='hs-chr'>'</span><span class='hs-conid'>CState</span> <span class='hs-layout'>)</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="EC"></a><span class='hs-comment'>-- | We use nested State monads to give nice syntax. The outer state</span>
<a name="line-41"></a><a name="EC"></a><span class='hs-comment'>-- is the graphical element being constructed (typically a</span>
<a name="line-42"></a><a name="EC"></a><span class='hs-comment'>-- layout). The inner state contains any additional state</span>
<a name="line-43"></a><a name="EC"></a><span class='hs-comment'>-- reqired. This approach means that lenses and the state monad lens</span>
<a name="line-44"></a><a name="EC"></a><span class='hs-comment'>-- operators can be used directly on the value being constructed.</span>
<a name="line-45"></a><a name="EC"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>EC</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StateT</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>State</span> <span class='hs-conid'>CState</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="instance%20Default%20CState"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-conid'>CState</span> <span class='hs-keyword'>where</span>
<a name="line-48"></a> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CState</span> <span class='hs-varid'>defColors</span> <span class='hs-varid'>defShapes</span>
<a name="line-49"></a> <span class='hs-keyword'>where</span>
<a name="line-50"></a> <span class='hs-varid'>defColors</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cycle</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>opaque</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>blue</span><span class='hs-layout'>,</span><span class='hs-varid'>green</span><span class='hs-layout'>,</span><span class='hs-varid'>red</span><span class='hs-layout'>,</span><span class='hs-varid'>orange</span><span class='hs-layout'>,</span><span class='hs-varid'>yellow</span><span class='hs-layout'>,</span><span class='hs-varid'>violet</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-51"></a> <span class='hs-varid'>defShapes</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cycle</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>PointShapeCircle</span><span class='hs-layout'>,</span><span class='hs-conid'>PointShapePlus</span><span class='hs-layout'>,</span><span class='hs-conid'>PointShapeCross</span><span class='hs-layout'>,</span><span class='hs-conid'>PointShapeStar</span><span class='hs-keyglyph'>]</span>
<a name="line-52"></a>
<a name="line-53"></a><a name="instance%20ToRenderable%20(EC%20a%20b)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Default</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-conid'>ToRenderable</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ToRenderable</span> <span class='hs-layout'>(</span><span class='hs-conid'>EC</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-54"></a> <span class='hs-varid'>toRenderable</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toRenderable</span> <span class='hs-varop'>.</span> <span class='hs-varid'>execEC</span>
<a name="line-55"></a>
<a name="line-56"></a><a name="execEC"></a><span class='hs-comment'>-- | Run the monadic `EC` computation, and return the graphical</span>
<a name="line-57"></a><span class='hs-comment'>-- element (ie the outer monad' state)</span>
<a name="line-58"></a><span class='hs-definition'>execEC</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Default</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>EC</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span>
<a name="line-59"></a><span class='hs-definition'>execEC</span> <span class='hs-varid'>ec</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>evalState</span> <span class='hs-layout'>(</span><span class='hs-varid'>execStateT</span> <span class='hs-varid'>ec</span> <span class='hs-varid'>def</span><span class='hs-layout'>)</span> <span class='hs-varid'>def</span>
<a name="line-60"></a>
<a name="line-61"></a><a name="liftEC"></a><span class='hs-comment'>-- | Nest the construction of a graphical element within</span>
<a name="line-62"></a><span class='hs-comment'>-- the construction of another.</span>
<a name="line-63"></a><span class='hs-definition'>liftEC</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Default</span> <span class='hs-varid'>l1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>EC</span> <span class='hs-varid'>l1</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>EC</span> <span class='hs-varid'>l2</span> <span class='hs-varid'>l1</span>
<a name="line-64"></a><span class='hs-definition'>liftEC</span> <span class='hs-varid'>ec</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-65"></a> <span class='hs-varid'>cs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lift</span> <span class='hs-varid'>get</span>
<a name="line-66"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>cs'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>runState</span> <span class='hs-layout'>(</span><span class='hs-varid'>execStateT</span> <span class='hs-varid'>ec</span> <span class='hs-varid'>def</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span>
<a name="line-67"></a> <span class='hs-varid'>lift</span> <span class='hs-layout'>(</span><span class='hs-varid'>put</span> <span class='hs-varid'>cs'</span><span class='hs-layout'>)</span>
<a name="line-68"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>l</span>
<a name="line-69"></a>
<a name="line-70"></a><a name="liftCState"></a><span class='hs-comment'>-- | Lift a a computation over `CState`</span>
<a name="line-71"></a><span class='hs-definition'>liftCState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>State</span> <span class='hs-conid'>CState</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>EC</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-72"></a><span class='hs-definition'>liftCState</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lift</span>
<a name="line-73"></a>
<a name="line-74"></a><a name="plot"></a><span class='hs-comment'>-- | Add a plot to the `Layout` being constructed.</span>
<a name="line-75"></a><span class='hs-definition'>plot</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>ToPlot</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>EC</span> <span class='hs-layout'>(</span><span class='hs-conid'>Layout</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>EC</span> <span class='hs-layout'>(</span><span class='hs-conid'>Layout</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-conid'>()</span>
<a name="line-76"></a><span class='hs-definition'>plot</span> <span class='hs-varid'>pm</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-77"></a> <span class='hs-varid'>p</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pm</span>
<a name="line-78"></a> <span class='hs-varid'>layout_plots</span> <span class='hs-varop'>%=</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>toPlot</span> <span class='hs-varid'>p</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-79"></a>
<a name="line-80"></a><a name="plotLeft"></a><span class='hs-comment'>-- | Add a plot against the left axis to the `LayoutLR` being constructed.</span>
<a name="line-81"></a><span class='hs-definition'>plotLeft</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>ToPlot</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>EC</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutLR</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y1</span> <span class='hs-varid'>y2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>EC</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutLR</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y1</span> <span class='hs-varid'>y2</span><span class='hs-layout'>)</span> <span class='hs-conid'>()</span>
<a name="line-82"></a><span class='hs-definition'>plotLeft</span> <span class='hs-varid'>pm</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-83"></a> <span class='hs-varid'>p</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pm</span>
<a name="line-84"></a> <span class='hs-varid'>layoutlr_plots</span> <span class='hs-varop'>%=</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-varid'>toPlot</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-85"></a>
<a name="line-86"></a><a name="plotRight"></a><span class='hs-comment'>-- | Add a plot against the right axis tof the `LayoutLR` being constructed.</span>
<a name="line-87"></a><span class='hs-definition'>plotRight</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>ToPlot</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>EC</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutLR</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y1</span> <span class='hs-varid'>y2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>EC</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutLR</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y1</span> <span class='hs-varid'>y2</span><span class='hs-layout'>)</span> <span class='hs-conid'>()</span>
<a name="line-88"></a><span class='hs-definition'>plotRight</span> <span class='hs-varid'>pm</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-89"></a> <span class='hs-varid'>p</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pm</span>
<a name="line-90"></a> <span class='hs-varid'>layoutlr_plots</span> <span class='hs-varop'>%=</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>toPlot</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-91"></a>
<a name="line-92"></a><a name="takeColor"></a><span class='hs-comment'>-- | Pop and return the next color from the state</span>
<a name="line-93"></a><span class='hs-definition'>takeColor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EC</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>AlphaColour</span> <span class='hs-conid'>Double</span><span class='hs-layout'>)</span>
<a name="line-94"></a><span class='hs-definition'>takeColor</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftCState</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-95"></a> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>use</span> <span class='hs-varid'>colors</span>
<a name="line-96"></a> <span class='hs-varid'>colors</span> <span class='hs-varop'>.=</span> <span class='hs-varid'>cs</span>
<a name="line-97"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>c</span>
<a name="line-98"></a>
<a name="line-99"></a><a name="takeShape"></a><span class='hs-comment'>-- | Pop and return the next shape from the state</span>
<a name="line-100"></a><span class='hs-definition'>takeShape</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EC</span> <span class='hs-varid'>l</span> <span class='hs-conid'>PointShape</span>
<a name="line-101"></a><span class='hs-definition'>takeShape</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftCState</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-102"></a> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>use</span> <span class='hs-varid'>shapes</span>
<a name="line-103"></a> <span class='hs-varid'>shapes</span> <span class='hs-varop'>.=</span> <span class='hs-varid'>cs</span>
<a name="line-104"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>c</span>
<a name="line-105"></a>
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