Factor out TernaryGraph module

src/Main.purs

@@ -1,166 +1,9 @@
 module Main where
 
-import Prelude ( discard, class Monoid, class Semigroup, Unit, ($), (<<<), (<>), (*), (+), (-), (/))
-
-import Data.Array ((!!), concat, cons, mapWithIndex, range)
-import Data.Functor (map)
-import Data.Int (toNumber)
-import Data.Maybe
-import Data.Number (cos, pi, sin)
-import Data.Number.Format (toString)
-import Data.List (fold)
-import Data.Ord ((<))
-import Data.Ring (negate)
-import Data.Tuple.Nested (Tuple3, tuple3, get1, get2, get3)
 import Effect (Effect)
 import Effect.Console (log)
-
-type Point =
-  { x :: Number
-  , y :: Number
-  }
-
-type Line =
-  { start :: Point
-  , end :: Point
-  }
-
--- TODO: How to do more normal math expressions?
-rotate :: Number -> Point -> Point
-rotate angle { x: x, y: y} = {
-  x: x * (cos angle) - y * (sin angle),
-  y: x * (sin angle) + y * (cos angle)
-}
-
-transform :: Number -> Number -> Number -> Point -> Point
-transform scale xOffset yOffset { x: x, y: y} = {
-  x: scale * x + xOffset,
-  y: scale * y + yOffset
-}
-
-rotateLine :: Number -> Line -> Line
-rotateLine angle { start: p1, end: p2} = {
-  start: rotate angle p1,
-  end: rotate angle p2
-}
-
-transformLine :: Number -> Number -> Number -> Line -> Line
-transformLine scale xOffset yOffset { start: start, end: end } = {
-start : t start,
-end : t end
-}
-  where t = transform scale xOffset yOffset
-
--- How to handle the different coordinate systems?
--- These things should be generated in the basic coordinate system
--- * ticks via generateTicks
--- * axis labels
--- * axis lines
--- There should be a transform function that these should be passed through directly after generation
-
-newtype XMLFragment = XMLFragment String
-
-derive newtype instance xmlFragmentSemiGroup :: Semigroup XMLFragment
-derive newtype instance xmlFragmentMonoid :: Monoid XMLFragment
-
--- TODO: Add style configuration
-svgLine :: Line -> XMLFragment
-svgLine { start: {x: x1, y: y1}, end: {x: x2, y: y2} } =
-  XMLFragment $ """<path style="fill:none;stroke:#000000;stroke-width:0.5;stroke-linecap:butt;stroke-linejoin:miter;stroke-dasharray:none;stroke-opacity:1"
-  """ <> "d=\"M " <> (toString x1) <> "," <> (toString y1) <> " " <> (toString x2) <> "," <> (toString y2) <> "\"/>"
-
--- TODO: position at center of text
-svgText :: String -> Number -> Point -> Number -> XMLFragment
-svgText text fontSize { x: x, y: y } angle =
-  XMLFragment $ "<text xml:space=\"preserve\" style=\"font-size:" <> (toString fontSize) <> "px;line-height:131%;font-family:'Liberation sans';font-variant-position:super;fill:#000000;stroke:#000000;stroke-width:0.0999998;stroke-linecap:round;stop-color:#000000;fill-opacity:1\" "
-  <> "transform=\"translate(" <> (toString x) <> ", " <> (toString y) <> ") rotate(" <> (toString angle) <> ")\">" <> text <> "</text>"
-
--- TODO: Make axis tick size a parameter
-getTick :: Number -> Int -> Int -> Line
-getTick scale numTicks tickI =
-  {start: {x: x, y: -(0.5 + 5.0 / scale)}, end: {x: x, y: y}}
-  where
-    x = 2.0 * (sin (pi / 3.0)) * (toNumber tickI) / (toNumber numTicks) - (sin (pi / 3.0))
-    y = if tickI < numTicks / 2
-          then 1.0 + x * 1.5 / (sin (pi / 3.0))
-          else 1.0 - x * 1.5 / (sin (pi / 3.0))
-
-getTicks :: Number -> Number -> Int -> Tuple3 (Array Line) (Array Line) (Array Line)
-getTicks scale angle numTicks =
-  tuple3 axis1Lines axis2Lines axis3Lines
-  where
-    foo = map (getTick scale numTicks) (range 0 numTicks)
-    axis1Lines = map (rotateLine angle) foo
-    axis2Lines = map (rotateLine (2.0 * pi / 3.0)) axis1Lines
-    axis3Lines = map (rotateLine (2.0 * pi / 3.0)) axis2Lines
-
--- There's probably a better way to do this
-unfragment :: XMLFragment -> String
-unfragment (XMLFragment frag) = frag
-
-ternaryGraphSvg :: Array XMLFragment -> String
-ternaryGraphSvg fragments = """<?xml version="1.0" encoding="UTF-8"?>
-  <svg
-    width="150mm"
-    height="120mm"
-    viewBox="-50 -50 200 200"
-    version="1.1"
-    xmlns="http://www.w3.org/2000/svg"
-    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
-    xmlns:svg="http://www.w3.org/2000/svg">
-""" <> unfragment (fold fragments) <> "</svg>"
-
-axesPoints :: Number -> Tuple3 Point Point Point
-axesPoints angle = tuple3 
-  (rotate angle { x: 0.0, y: 1.0 })
-  (rotate angle { x: -(sin (2.0 * pi / 3.0)), y : -0.5})
-  (rotate angle { x: (sin (2.0 * pi / 3.0)), y: -0.5 })
-
-axesPath :: Point -> Point -> Point -> XMLFragment
-axesPath p1 p2 p3 = XMLFragment $ """<path style="fill:none;stroke:#000000;stroke-width:1;stroke-linecap:bevel;stroke-linejoin:bevel;stroke-dasharray:none;stroke-opacity:1"
-""" <> "d=\"M " <> (toString p1.x) <> "," <> (toString p1.y) <> " " <> (toString p2.x) <> "," <> (toString p2.y) <> " " <> (toString p3.x) <> "," <> (toString p3.y) <> " Z\"/>"
-
-ternaryGraph :: Number -> Number -> Number -> Int -> String
-ternaryGraph scale xOffset yOffset numTicks = ternaryGraphSvg fragments
-  where
-    axisTickLines = getTicks scale pi numTicks
-    axis1TickLines = map (transformLine scale xOffset yOffset) (get1 axisTickLines)
-    axis2TickLines = map (transformLine scale xOffset yOffset) (get2 axisTickLines)
-    axis3TickLines = map (transformLine scale xOffset yOffset) (get3 axisTickLines)
-    tickLines = concat [axis1TickLines, axis2TickLines, axis3TickLines]
-    tickLinesSvg = fold $ map svgLine tickLines
-
-    axesPointsPi = axesPoints pi
-    axisPoint1 = transform scale xOffset yOffset (get1 axesPointsPi)
-    axisPoint2 = transform scale xOffset yOffset (get2 axesPointsPi)
-    axisPoint3 = transform scale xOffset yOffset (get3 axesPointsPi)
-    axesPathSvg = axesPath axisPoint1 axisPoint2 axisPoint3
-
-    -- TODO: axis text size
-    axisTitlesSvg = [
-      svgText "axis 1" 12.0 (transform scale xOffset yOffset {x: 0.0, y: 1.2}) 0.0,
-      svgText "axis 2" 12.0 (transform scale xOffset yOffset {x: -(sin (2.0 * pi / 3.0)), y: -0.7}) (-60.0),
-      svgText "axis 3" 12.0 (transform scale xOffset yOffset {x: (sin (2.8 * pi / 3.0)), y: -0.7}) 60.0
-    ]
- 
-    axisTickStarts = map (\line -> line.start)
-    -- TODO: tick label size
-    -- TODO: axis tick label rotation
-    -- TODO: axis tick start number
-    axisTickLabels = \rotation -> mapWithIndex (\i point -> svgText ("E" <> (toString (toNumber i))) 10.0 point 0.0) 
-
-    axis1TickLabels = axisTickLabels 0 $ axisTickStarts axis1TickLines
-    axis2TickLabels = axisTickLabels 0 $ axisTickStarts axis2TickLines
-    axis3TickLabels = axisTickLabels 0 $ axisTickStarts axis3TickLines
-
-    tickLabelsSvg = concat [
-      axis1TickLabels,
-      axis2TickLabels,
-      axis3TickLabels
-    ]
-
-    fragments = concat [[tickLinesSvg, axesPathSvg], axisTitlesSvg, tickLabelsSvg]
+import TernaryGraph (ternaryGraph)
+import Prelude (($), Unit)
 
 main :: Effect Unit
 main = do