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|
module Chart.View exposing
( view
)
import Html exposing (Html)
import List.Extra as List
import Svg exposing (..)
import Svg.Attributes exposing (..)
import Chart.Model as Chart exposing (Chart, Serie, Vec2, View)
import Utils.List as List
view : Chart -> Html msg
view chart =
let { size, title, series } = chart
titleHeight = 100
captionHeight = 50
in svg
[ width << toString <| size.x
, height << toString <| size.y
, viewBox ("0 0 " ++ (toString size.x) ++ " " ++ (toString size.y))
]
( [ renderTitle (Chart.mkView { x = 0, y = 0 } { x = size.x, y = titleHeight }) title ]
++ renderSeriesAndScales (Chart.mkView { x = 50, y = titleHeight } { x = size.x, y = size.y - captionHeight }) chart
++ renderCaptions (Chart.mkView { x = 0, y = size.y - captionHeight } { x = size.x, y = size.y }) series
)
renderTitle : View -> String -> Svg msg
renderTitle view title =
text_
[ x << toString <| view.fx 0.5
, y << toString <| view.fy 0.5
, textAnchor "middle"
, dominantBaseline "middle"
, fontSize "20"
]
[ text title ]
renderSeriesAndScales : View -> Chart -> List (Svg msg)
renderSeriesAndScales view chart =
let { keys, series, scaleColor, formatOrdinate } = chart
(p1, p2) = Chart.bounds view
ordinateWidth = 100
abscissaHeight = 60
maxScale = Chart.maxScale chart
in ( renderOrdinates (Chart.mkView { x = p1.x, y = p1.y } { x = p1.x + ordinateWidth, y = p2.y - abscissaHeight }) formatOrdinate maxScale
++ renderAbscissas (Chart.mkView { x = p1.x + ordinateWidth, y = p2.y - abscissaHeight } { x = p2.x, y = p2.y }) keys scaleColor
++ renderSeries (Chart.mkView { x = p1.x + ordinateWidth, y = p1.y } { x = p2.x, y = p2.y - abscissaHeight }) series maxScale scaleColor
)
renderOrdinates : View -> (Float -> String) -> Float -> List (Svg msg)
renderOrdinates view formatOrdinate maxScale =
ordinates
|> List.map (\l ->
text_
[ x << toString <| view.fx 0.5
, y << toString <| view.fy l
, textAnchor "middle"
, dominantBaseline "middle"
]
[ text << formatOrdinate <| (1 - l) * maxScale ]
)
renderAbscissas : View -> List String -> String -> List (Svg msg)
renderAbscissas view keys scaleColor =
let count = List.length keys
in ( abscissasXPositions keys
|> List.map (\(xPos, key) ->
[ text_
[ x << toString <| view.fx xPos
, y << toString <| view.fy 0.5
, textAnchor "middle"
, dominantBaseline "middle"
]
[ text key ]
, line
[ x1 << toString <| view.fx xPos
, y1 << toString <| view.fy 0
, x2 << toString <| view.fx xPos
, y2 << toString <| view.fy 0.2
, stroke scaleColor
]
[]
]
)
|> List.concat
)
renderSeries : View -> List Serie -> Float -> String -> List (Svg msg)
renderSeries view series maxScale scaleColor =
( renderHorizontalLines view series scaleColor
++ renderPoints view series maxScale
)
renderHorizontalLines : View -> List Serie -> String -> List (Svg msg)
renderHorizontalLines view series scaleColor =
ordinates
|> List.map (\l ->
line
[ x1 << toString <| view.fx 0
, y1 << toString <| view.fy l
, x2 << toString <| view.fx 1
, y2 << toString <| view.fy l
, stroke scaleColor
]
[]
)
renderPoints : View -> List Serie -> Float -> List (Svg msg)
renderPoints view series maxScale =
series
|> List.map (\serie ->
let points =
abscissasXPositions serie.values
|> List.map (\(xPos, value) -> { x = xPos, y = 1 - value / maxScale })
in [ renderLines view serie.color points
, List.map (renderPoint view serie.color) points
]
|> List.concat
)
|> List.concat
renderLines : View -> String -> List Vec2 -> List (Svg msg)
renderLines view color points =
List.links points
|> List.map (\(p1, p2) ->
line
[ x1 << toString <| view.fx p1.x
, y1 << toString <| view.fy p1.y
, x2 << toString <| view.fx p2.x
, y2 << toString <| view.fy p2.y
, stroke color
]
[]
)
renderPoint : View -> String -> Vec2 -> Svg msg
renderPoint view color pos =
circle
[ cx << toString <| view.fx pos.x
, cy << toString <| view.fy pos.y
, r "4"
, fill color
]
[]
abscissasXPositions : List a -> List (Float, a)
abscissasXPositions xs =
let count = List.length xs
in xs
|> List.zip (List.range 1 (count + 1))
|> List.map (\(i, x) -> (toFloat i / (toFloat count + 1), x))
ordinates : List Float
ordinates =
let count = 10
in List.range 0 (count - 1)
|> List.map (\l -> toFloat l / (toFloat count - 1))
renderCaptions : View -> List Serie -> List (Svg msg)
renderCaptions view series =
let count = List.length series
in series
|> List.zip (List.range 1 (List.length series))
|> List.map (\(i, serie) ->
renderCaption { x = view.fx (toFloat i / (toFloat count + 1)), y = view.fy 0.5 } serie
)
|> List.concat
renderCaption : Vec2 -> Serie -> List (Svg msg)
renderCaption point { label, color } =
[ text_
[ x << toString <| point.x
, y << toString <| point.y
, textAnchor "middle"
, dominantBaseline "middle"
, fill color
, fontSize "18"
]
[ text label ]
]
|
