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<title>Graphics/Rendering/Chart/Plot/AreaSpots.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-- |</span>
<a name="line-2"></a><span class='hs-comment'>-- Module : Graphics.Rendering.Chart.Plot.AreaSpots</span>
<a name="line-3"></a><span class='hs-comment'>-- Copyright : (c) Malcolm Wallace 2009</span>
<a name="line-4"></a><span class='hs-comment'>-- License : BSD-style (see COPYRIGHT file)</span>
<a name="line-5"></a><span class='hs-comment'>--</span>
<a name="line-6"></a><span class='hs-comment'>-- Area spots are a collection of unconnected filled circles,</span>
<a name="line-7"></a><span class='hs-comment'>-- with x,y position, and an independent z value to be represented</span>
<a name="line-8"></a><span class='hs-comment'>-- by the relative area of the spots.</span>
<a name="line-9"></a>
<a name="line-10"></a><span class='hs-comment'>{-# LANGUAGE TemplateHaskell #-}</span>
<a name="line-11"></a>
<a name="line-12"></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'>Plot</span><span class='hs-varop'>.</span><span class='hs-conid'>AreaSpots</span>
<a name="line-13"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>AreaSpots</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-14"></a>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>area_spots_title</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>area_spots_linethick</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>area_spots_linecolour</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>area_spots_fillcolour</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>area_spots_opacity</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>area_spots_max_radius</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>area_spots_values</span>
<a name="line-22"></a>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>AreaSpots4D</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-24"></a>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>area_spots_4d_title</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>area_spots_4d_linethick</span>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>area_spots_4d_palette</span>
<a name="line-28"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>area_spots_4d_opacity</span>
<a name="line-29"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>area_spots_4d_max_radius</span>
<a name="line-30"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>area_spots_4d_values</span>
<a name="line-31"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-32"></a>
<a name="line-33"></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'>Geometry</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>scale</span><span class='hs-layout'>,</span> <span class='hs-varid'>x0</span><span class='hs-layout'>,</span> <span class='hs-varid'>y0</span><span class='hs-layout'>)</span>
<a name="line-34"></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-35"></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><span class='hs-varop'>.</span><span class='hs-conid'>Types</span>
<a name="line-36"></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'>Axis</span>
<a name="line-37"></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-38"></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-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>over</span><span class='hs-layout'>)</span>
<a name="line-39"></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-40"></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-41"></a>
<a name="line-42"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-43"></a>
<a name="line-44"></a><a name="AreaSpots"></a><span class='hs-comment'>-- | A collection of unconnected spots, with x,y position, and an</span>
<a name="line-45"></a><a name="AreaSpots"></a><span class='hs-comment'>-- independent z value to be represented by the area of the spot.</span>
<a name="line-46"></a><a name="AreaSpots"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>AreaSpots</span> <span class='hs-varid'>z</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>AreaSpots</span>
<a name="line-47"></a> <span class='hs-layout'>{</span> <span class='hs-sel'>_area_spots_title</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-48"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_linethick</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Double</span>
<a name="line-49"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_linecolour</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>AlphaColour</span> <span class='hs-conid'>Double</span>
<a name="line-50"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_fillcolour</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Colour</span> <span class='hs-conid'>Double</span>
<a name="line-51"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_opacity</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Double</span>
<a name="line-52"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_max_radius</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Double</span> <span class='hs-comment'>-- ^ the largest size of spot</span>
<a name="line-53"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_values</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span><span class='hs-varid'>z</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-54"></a> <span class='hs-layout'>}</span>
<a name="line-55"></a>
<a name="line-56"></a><a name="instance%20Default%20(AreaSpots%20z%20x%20y)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>AreaSpots</span> <span class='hs-varid'>z</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-57"></a> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>AreaSpots</span>
<a name="line-58"></a> <span class='hs-layout'>{</span> <span class='hs-sel'>_area_spots_title</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</span>
<a name="line-59"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_linethick</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0.1</span>
<a name="line-60"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_linecolour</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>opaque</span> <span class='hs-varid'>blue</span>
<a name="line-61"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_fillcolour</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>blue</span>
<a name="line-62"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_opacity</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0.2</span>
<a name="line-63"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_max_radius</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>20</span> <span class='hs-comment'>-- in pixels</span>
<a name="line-64"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_values</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-65"></a> <span class='hs-layout'>}</span>
<a name="line-66"></a>
<a name="line-67"></a><a name="instance%20ToPlot%20(AreaSpots%20z)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>PlotValue</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ToPlot</span> <span class='hs-layout'>(</span><span class='hs-conid'>AreaSpots</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-68"></a> <span class='hs-varid'>toPlot</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Plot</span> <span class='hs-layout'>{</span> <span class='hs-sel'>_plot_render</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>renderAreaSpots</span> <span class='hs-varid'>p</span>
<a name="line-69"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_plot_legend</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_title</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>renderSpotLegend</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-70"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_plot_all_points</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varop'>^.</span><span class='hs-sel'>_1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_values</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-71"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varop'>^.</span><span class='hs-sel'>_2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_values</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-72"></a> <span class='hs-layout'>}</span>
<a name="line-73"></a>
<a name="line-74"></a><a name="renderAreaSpots"></a><span class='hs-definition'>renderAreaSpots</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>PlotValue</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>AreaSpots</span> <span class='hs-varid'>z</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PointMapFn</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ChartBackend</span> <span class='hs-conid'>()</span>
<a name="line-75"></a><span class='hs-definition'>renderAreaSpots</span> <span class='hs-varid'>p</span> <span class='hs-varid'>pmap</span> <span class='hs-keyglyph'>=</span>
<a name="line-76"></a> <span class='hs-varid'>forM_</span> <span class='hs-layout'>(</span><span class='hs-varid'>scaleMax</span> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_max_radius</span> <span class='hs-varid'>p</span><span class='hs-varop'>^</span><span class='hs-layout'>(</span><span class='hs-num'>2</span><span class='hs-keyglyph'>::</span><span class='hs-conid'>Integer</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-77"></a> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_values</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-78"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span><span class='hs-varid'>z</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-79"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>radius</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sqrt</span> <span class='hs-varid'>z</span>
<a name="line-80"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>psSpot</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filledCircles</span> <span class='hs-varid'>radius</span> <span class='hs-varop'>$</span>
<a name="line-81"></a> <span class='hs-varid'>flip</span> <span class='hs-varid'>withOpacity</span>
<a name="line-82"></a> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_opacity</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-83"></a> <span class='hs-sel'>_area_spots_fillcolour</span> <span class='hs-varid'>p</span>
<a name="line-84"></a> <span class='hs-varid'>drawPoint</span> <span class='hs-varid'>psSpot</span> <span class='hs-layout'>(</span><span class='hs-varid'>pmap</span> <span class='hs-layout'>(</span><span class='hs-conid'>LValue</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-conid'>LValue</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-85"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>psOutline</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hollowCircles</span> <span class='hs-varid'>radius</span>
<a name="line-86"></a> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_linethick</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-87"></a> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_linecolour</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-88"></a> <span class='hs-varid'>drawPoint</span> <span class='hs-varid'>psOutline</span> <span class='hs-layout'>(</span><span class='hs-varid'>pmap</span> <span class='hs-layout'>(</span><span class='hs-conid'>LValue</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-conid'>LValue</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-89"></a> <span class='hs-layout'>)</span>
<a name="line-90"></a> <span class='hs-keyword'>where</span>
<a name="line-91"></a> <span class='hs-varid'>scaleMax</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PlotValue</span> <span class='hs-varid'>z</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span><span class='hs-varid'>z</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span><span class='hs-conid'>Double</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-92"></a> <span class='hs-varid'>scaleMax</span> <span class='hs-varid'>n</span> <span class='hs-varid'>points</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>largest</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maximum</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varop'>^.</span><span class='hs-sel'>_3</span><span class='hs-varop'>.</span><span class='hs-varid'>to</span> <span class='hs-varid'>toValue</span><span class='hs-layout'>)</span> <span class='hs-varid'>points</span><span class='hs-layout'>)</span>
<a name="line-93"></a> <span class='hs-varid'>scale</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span> <span class='hs-varop'>*</span> <span class='hs-varid'>toValue</span> <span class='hs-varid'>v</span> <span class='hs-varop'>/</span> <span class='hs-varid'>largest</span>
<a name="line-94"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>over</span> <span class='hs-layout'>(</span><span class='hs-varid'>mapped</span><span class='hs-varop'>.</span><span class='hs-sel'>_3</span><span class='hs-layout'>)</span> <span class='hs-varid'>scale</span> <span class='hs-varid'>points</span>
<a name="line-95"></a>
<a name="line-96"></a><a name="renderSpotLegend"></a><span class='hs-definition'>renderSpotLegend</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>AreaSpots</span> <span class='hs-varid'>z</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rect</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ChartBackend</span> <span class='hs-conid'>()</span>
<a name="line-97"></a><span class='hs-definition'>renderSpotLegend</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rect</span> <span class='hs-varid'>p1</span> <span class='hs-varid'>p2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-98"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>radius</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>min</span> <span class='hs-layout'>(</span><span class='hs-varid'>abs</span> <span class='hs-layout'>(</span><span class='hs-varid'>p_y</span> <span class='hs-varid'>p1</span> <span class='hs-comment'>-</span> <span class='hs-varid'>p_y</span> <span class='hs-varid'>p2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>abs</span> <span class='hs-layout'>(</span><span class='hs-varid'>p_x</span> <span class='hs-varid'>p1</span> <span class='hs-comment'>-</span> <span class='hs-varid'>p_x</span> <span class='hs-varid'>p2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-99"></a> <span class='hs-varid'>centre</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>linearInterpolate</span> <span class='hs-varid'>p1</span> <span class='hs-varid'>p2</span>
<a name="line-100"></a> <span class='hs-varid'>psSpot</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filledCircles</span> <span class='hs-varid'>radius</span> <span class='hs-varop'>$</span> <span class='hs-varid'>withOpacity</span>
<a name="line-101"></a> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_fillcolour</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-102"></a> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_opacity</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-103"></a> <span class='hs-varid'>psOutline</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hollowCircles</span> <span class='hs-varid'>radius</span> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_linethick</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-104"></a> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_linecolour</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-105"></a> <span class='hs-varid'>drawPoint</span> <span class='hs-varid'>psSpot</span> <span class='hs-varid'>centre</span>
<a name="line-106"></a> <span class='hs-varid'>drawPoint</span> <span class='hs-varid'>psOutline</span> <span class='hs-varid'>centre</span>
<a name="line-107"></a> <span class='hs-keyword'>where</span>
<a name="line-108"></a> <span class='hs-varid'>linearInterpolate</span> <span class='hs-layout'>(</span><span class='hs-conid'>Point</span> <span class='hs-varid'>x0</span> <span class='hs-varid'>y0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Point</span> <span class='hs-varid'>x1</span> <span class='hs-varid'>y1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-109"></a> <span class='hs-conid'>Point</span> <span class='hs-layout'>(</span><span class='hs-varid'>x0</span> <span class='hs-varop'>+</span> <span class='hs-varid'>abs</span><span class='hs-layout'>(</span><span class='hs-varid'>x1</span><span class='hs-comment'>-</span><span class='hs-varid'>x0</span><span class='hs-layout'>)</span><span class='hs-varop'>/</span><span class='hs-num'>2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>y0</span> <span class='hs-varop'>+</span> <span class='hs-varid'>abs</span><span class='hs-layout'>(</span><span class='hs-varid'>y1</span><span class='hs-comment'>-</span><span class='hs-varid'>y0</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-110"></a>
<a name="line-111"></a><a name="AreaSpots4D"></a><span class='hs-comment'>-- | A collection of unconnected spots, with x,y position, an</span>
<a name="line-112"></a><a name="AreaSpots4D"></a><span class='hs-comment'>-- independent z value to be represented by the area of the spot,</span>
<a name="line-113"></a><a name="AreaSpots4D"></a><span class='hs-comment'>-- and in addition, a fourth variable t to be represented by a colour</span>
<a name="line-114"></a><a name="AreaSpots4D"></a><span class='hs-comment'>-- from a given palette. (A linear transfer function from t to palette</span>
<a name="line-115"></a><a name="AreaSpots4D"></a><span class='hs-comment'>-- is assumed.)</span>
<a name="line-116"></a><a name="AreaSpots4D"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>AreaSpots4D</span> <span class='hs-varid'>z</span> <span class='hs-varid'>t</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>AreaSpots4D</span>
<a name="line-117"></a> <span class='hs-layout'>{</span> <span class='hs-sel'>_area_spots_4d_title</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-118"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_4d_linethick</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Double</span>
<a name="line-119"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_4d_palette</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Colour</span> <span class='hs-conid'>Double</span><span class='hs-keyglyph'>]</span>
<a name="line-120"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_4d_opacity</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Double</span>
<a name="line-121"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_4d_max_radius</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Double</span> <span class='hs-comment'>-- ^ the largest size of spot</span>
<a name="line-122"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_4d_values</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span><span class='hs-varid'>z</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-123"></a> <span class='hs-layout'>}</span>
<a name="line-124"></a>
<a name="line-125"></a><a name="instance%20Default%20(AreaSpots4D%20z%20t%20x%20y)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Default</span> <span class='hs-layout'>(</span><span class='hs-conid'>AreaSpots4D</span> <span class='hs-varid'>z</span> <span class='hs-varid'>t</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-126"></a> <span class='hs-varid'>def</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>AreaSpots4D</span>
<a name="line-127"></a> <span class='hs-layout'>{</span> <span class='hs-sel'>_area_spots_4d_title</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</span>
<a name="line-128"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_4d_linethick</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0.1</span>
<a name="line-129"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_4d_palette</span> <span class='hs-keyglyph'>=</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'>yellow</span><span class='hs-layout'>,</span> <span class='hs-varid'>orange</span><span class='hs-layout'>,</span> <span class='hs-varid'>red</span> <span class='hs-keyglyph'>]</span>
<a name="line-130"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_4d_opacity</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0.2</span>
<a name="line-131"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_4d_max_radius</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>20</span> <span class='hs-comment'>-- in pixels</span>
<a name="line-132"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_area_spots_4d_values</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-133"></a> <span class='hs-layout'>}</span>
<a name="line-134"></a>
<a name="line-135"></a><a name="instance%20ToPlot%20(AreaSpots4D%20z%20t)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>PlotValue</span> <span class='hs-varid'>z</span><span class='hs-layout'>,</span> <span class='hs-conid'>PlotValue</span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ToPlot</span> <span class='hs-layout'>(</span><span class='hs-conid'>AreaSpots4D</span> <span class='hs-varid'>z</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-136"></a> <span class='hs-varid'>toPlot</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Plot</span> <span class='hs-layout'>{</span> <span class='hs-sel'>_plot_render</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>renderAreaSpots4D</span> <span class='hs-varid'>p</span>
<a name="line-137"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_plot_legend</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_4d_title</span> <span class='hs-varid'>p</span>
<a name="line-138"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>renderSpotLegend4D</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>]</span>
<a name="line-139"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_plot_all_points</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varop'>^.</span><span class='hs-sel'>_1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_4d_values</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-140"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varop'>^.</span><span class='hs-sel'>_2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_4d_values</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-141"></a> <span class='hs-layout'>}</span>
<a name="line-142"></a>
<a name="line-143"></a><a name="renderAreaSpots4D"></a><span class='hs-definition'>renderAreaSpots4D</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>PlotValue</span> <span class='hs-varid'>z</span><span class='hs-layout'>,</span> <span class='hs-conid'>PlotValue</span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-144"></a> <span class='hs-conid'>AreaSpots4D</span> <span class='hs-varid'>z</span> <span class='hs-varid'>t</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PointMapFn</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ChartBackend</span> <span class='hs-conid'>()</span>
<a name="line-145"></a><span class='hs-definition'>renderAreaSpots4D</span> <span class='hs-varid'>p</span> <span class='hs-varid'>pmap</span> <span class='hs-keyglyph'>=</span>
<a name="line-146"></a> <span class='hs-varid'>forM_</span> <span class='hs-layout'>(</span><span class='hs-varid'>scaleMax</span> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_4d_max_radius</span> <span class='hs-varid'>p</span><span class='hs-varop'>^</span><span class='hs-layout'>(</span><span class='hs-num'>2</span><span class='hs-keyglyph'>::</span><span class='hs-conid'>Integer</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-147"></a> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_4d_palette</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-148"></a> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_4d_values</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-149"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span><span class='hs-varid'>z</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-150"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>radius</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sqrt</span> <span class='hs-varid'>z</span>
<a name="line-151"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>colour</span> <span class='hs-keyglyph'>=</span> <span class='hs-sel'>_area_spots_4d_palette</span> <span class='hs-varid'>p</span> <span class='hs-varop'>!!</span> <span class='hs-varid'>t</span>
<a name="line-152"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>psSpot</span>
<a name="line-153"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filledCircles</span> <span class='hs-varid'>radius</span> <span class='hs-varop'>$</span>
<a name="line-154"></a> <span class='hs-varid'>withOpacity</span> <span class='hs-varid'>colour</span> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_4d_opacity</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-155"></a> <span class='hs-varid'>drawPoint</span> <span class='hs-varid'>psSpot</span> <span class='hs-layout'>(</span><span class='hs-varid'>pmap</span> <span class='hs-layout'>(</span><span class='hs-conid'>LValue</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-conid'>LValue</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-156"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>psOutline</span>
<a name="line-157"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hollowCircles</span> <span class='hs-varid'>radius</span> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_4d_linethick</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-158"></a> <span class='hs-layout'>(</span><span class='hs-varid'>opaque</span> <span class='hs-varid'>colour</span><span class='hs-layout'>)</span>
<a name="line-159"></a> <span class='hs-varid'>drawPoint</span> <span class='hs-varid'>psOutline</span> <span class='hs-layout'>(</span><span class='hs-varid'>pmap</span> <span class='hs-layout'>(</span><span class='hs-conid'>LValue</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-conid'>LValue</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-160"></a> <span class='hs-layout'>)</span>
<a name="line-161"></a> <span class='hs-keyword'>where</span>
<a name="line-162"></a> <span class='hs-varid'>scaleMax</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>PlotValue</span> <span class='hs-varid'>z</span><span class='hs-layout'>,</span> <span class='hs-conid'>PlotValue</span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span>
<a name="line-163"></a> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span><span class='hs-varid'>z</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span><span class='hs-conid'>Double</span><span class='hs-layout'>,</span><span class='hs-conid'>Int</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-164"></a> <span class='hs-varid'>scaleMax</span> <span class='hs-varid'>n</span> <span class='hs-varid'>c</span> <span class='hs-varid'>points</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>largest</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maximum</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varop'>^.</span><span class='hs-sel'>_3</span><span class='hs-varop'>.</span><span class='hs-varid'>to</span> <span class='hs-varid'>toValue</span><span class='hs-layout'>)</span> <span class='hs-varid'>points</span><span class='hs-layout'>)</span>
<a name="line-165"></a> <span class='hs-varid'>scale</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span> <span class='hs-varop'>*</span> <span class='hs-varid'>toValue</span> <span class='hs-varid'>v</span> <span class='hs-varop'>/</span> <span class='hs-varid'>largest</span>
<a name="line-166"></a> <span class='hs-varid'>colVals</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varop'>^.</span><span class='hs-sel'>_4</span><span class='hs-varop'>.</span><span class='hs-varid'>to</span> <span class='hs-varid'>toValue</span><span class='hs-layout'>)</span> <span class='hs-varid'>points</span>
<a name="line-167"></a> <span class='hs-varid'>colMin</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>minimum</span> <span class='hs-varid'>colVals</span>
<a name="line-168"></a> <span class='hs-varid'>colMax</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maximum</span> <span class='hs-varid'>colVals</span>
<a name="line-169"></a> <span class='hs-varid'>select</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>min</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-170"></a> <span class='hs-varid'>truncate</span> <span class='hs-layout'>(</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>c</span>
<a name="line-171"></a> <span class='hs-varop'>*</span> <span class='hs-layout'>(</span><span class='hs-varid'>toValue</span> <span class='hs-varid'>t</span><span class='hs-comment'>-</span><span class='hs-varid'>colMin</span><span class='hs-layout'>)</span>
<a name="line-172"></a> <span class='hs-varop'>/</span> <span class='hs-layout'>(</span><span class='hs-varid'>colMax</span><span class='hs-comment'>-</span><span class='hs-varid'>colMin</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-173"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span><span class='hs-varid'>z</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-varid'>scale</span> <span class='hs-varid'>z</span><span class='hs-layout'>,</span> <span class='hs-varid'>select</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-174"></a> <span class='hs-varid'>points</span>
<a name="line-175"></a>
<a name="line-176"></a><a name="renderSpotLegend4D"></a><span class='hs-definition'>renderSpotLegend4D</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>AreaSpots4D</span> <span class='hs-varid'>z</span> <span class='hs-varid'>t</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rect</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ChartBackend</span> <span class='hs-conid'>()</span>
<a name="line-177"></a><span class='hs-definition'>renderSpotLegend4D</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rect</span> <span class='hs-varid'>p1</span> <span class='hs-varid'>p2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-178"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>radius</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>min</span> <span class='hs-layout'>(</span><span class='hs-varid'>abs</span> <span class='hs-layout'>(</span><span class='hs-varid'>p_y</span> <span class='hs-varid'>p1</span> <span class='hs-comment'>-</span> <span class='hs-varid'>p_y</span> <span class='hs-varid'>p2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>abs</span> <span class='hs-layout'>(</span><span class='hs-varid'>p_x</span> <span class='hs-varid'>p1</span> <span class='hs-comment'>-</span> <span class='hs-varid'>p_x</span> <span class='hs-varid'>p2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-179"></a> <span class='hs-varid'>centre</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>linearInterpolate</span> <span class='hs-varid'>p1</span> <span class='hs-varid'>p2</span>
<a name="line-180"></a> <span class='hs-varid'>palCol</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>head</span> <span class='hs-varop'>$</span> <span class='hs-sel'>_area_spots_4d_palette</span> <span class='hs-varid'>p</span>
<a name="line-181"></a> <span class='hs-varid'>psSpot</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filledCircles</span> <span class='hs-varid'>radius</span> <span class='hs-varop'>$</span> <span class='hs-varid'>withOpacity</span> <span class='hs-varid'>palCol</span>
<a name="line-182"></a> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_4d_opacity</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-183"></a> <span class='hs-varid'>psOutline</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hollowCircles</span> <span class='hs-varid'>radius</span> <span class='hs-layout'>(</span><span class='hs-sel'>_area_spots_4d_linethick</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-184"></a> <span class='hs-layout'>(</span><span class='hs-varid'>opaque</span> <span class='hs-varid'>palCol</span><span class='hs-layout'>)</span>
<a name="line-185"></a> <span class='hs-varid'>drawPoint</span> <span class='hs-varid'>psSpot</span> <span class='hs-varid'>centre</span>
<a name="line-186"></a> <span class='hs-varid'>drawPoint</span> <span class='hs-varid'>psOutline</span> <span class='hs-varid'>centre</span>
<a name="line-187"></a> <span class='hs-keyword'>where</span>
<a name="line-188"></a> <span class='hs-varid'>linearInterpolate</span> <span class='hs-layout'>(</span><span class='hs-conid'>Point</span> <span class='hs-varid'>x0</span> <span class='hs-varid'>y0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Point</span> <span class='hs-varid'>x1</span> <span class='hs-varid'>y1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-189"></a> <span class='hs-conid'>Point</span> <span class='hs-layout'>(</span><span class='hs-varid'>x0</span> <span class='hs-varop'>+</span> <span class='hs-varid'>abs</span><span class='hs-layout'>(</span><span class='hs-varid'>x1</span><span class='hs-comment'>-</span><span class='hs-varid'>x0</span><span class='hs-layout'>)</span><span class='hs-varop'>/</span><span class='hs-num'>2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>y0</span> <span class='hs-varop'>+</span> <span class='hs-varid'>abs</span><span class='hs-layout'>(</span><span class='hs-varid'>y1</span><span class='hs-comment'>-</span><span class='hs-varid'>y0</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-190"></a>
<a name="line-191"></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'>AreaSpots</span> <span class='hs-layout'>)</span>
<a name="line-192"></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'>AreaSpots4D</span> <span class='hs-layout'>)</span>
</pre></body>
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