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|
-----------------------------------------------------------------------------
-- |
-- Module : Graphics.Rendering.Chart.Plot.Pie
-- Copyright : (c) Tim Docker 2008, 2014
-- License : BSD-style (see chart/COPYRIGHT)
--
-- A basic pie chart.
--
-- Pie charts are handled different to other plots, in that they
-- have their own layout, and can't be composed with other plots. A
-- pie chart is rendered with code in the following form:
--
-- @
-- values :: [PieItem]
-- values = [...]
-- layout :: PieLayout
-- layout = pie_plot ^: pie_data ^= values
-- $ def
-- renderable = toRenderable layout
-- @
{-# LANGUAGE TemplateHaskell #-}
module Graphics.Rendering.Chart.Plot.Pie(
PieLayout(..),
PieChart(..),
PieItem(..),
pieToRenderable,
pieChartToRenderable,
pie_title,
pie_title_style,
pie_plot,
pie_background,
pie_margin,
pie_data,
pie_colors,
pie_label_style,
pie_label_line_style,
pie_start_angle,
pitem_label,
pitem_offset,
pitem_value,
) where
-- original code thanks to Neal Alexander
-- see ../Drawing.hs for why we do not use hiding (moveTo) for
-- lens < 4
import Control.Lens
import Data.Colour
import Data.Colour.Names (white)
import Data.Default.Class
import Control.Monad
import Graphics.Rendering.Chart.Geometry hiding (moveTo)
import qualified Graphics.Rendering.Chart.Geometry as G
import Graphics.Rendering.Chart.Drawing
import Graphics.Rendering.Chart.Renderable
import Graphics.Rendering.Chart.Grid
data PieLayout = PieLayout {
_pie_title :: String,
_pie_title_style :: FontStyle,
_pie_plot :: PieChart,
_pie_background :: FillStyle,
_pie_margin :: Double
}
data PieChart = PieChart {
_pie_data :: [PieItem],
_pie_colors :: [AlphaColour Double],
_pie_label_style :: FontStyle,
_pie_label_line_style :: LineStyle,
_pie_start_angle :: Double
}
data PieItem = PieItem {
_pitem_label :: String,
_pitem_offset :: Double,
_pitem_value :: Double
}
instance Default PieChart where
def = PieChart
{ _pie_data = []
, _pie_colors = defaultColorSeq
, _pie_label_style = def
, _pie_label_line_style = solidLine 1 $ opaque black
, _pie_start_angle = 0
}
instance Default PieItem where
def = PieItem "" 0 0
instance Default PieLayout where
def = PieLayout
{ _pie_background = solidFillStyle $ opaque white
, _pie_title = ""
, _pie_title_style = def { _font_size = 15
, _font_weight = FontWeightBold }
, _pie_plot = def
, _pie_margin = 10
}
instance ToRenderable PieLayout where
toRenderable = setPickFn nullPickFn . pieToRenderable
pieChartToRenderable :: PieChart -> Renderable (PickFn a)
pieChartToRenderable p = Renderable { minsize = minsizePie p
, render = renderPie p
}
instance ToRenderable PieChart where
toRenderable = setPickFn nullPickFn . pieChartToRenderable
pieToRenderable :: PieLayout -> Renderable (PickFn a)
pieToRenderable p = fillBackground (_pie_background p) (
gridToRenderable $ aboveN
[ tval $ addMargins (lm/2,0,0,0) (setPickFn nullPickFn title)
, weights (1,1) $ tval $ addMargins (lm,lm,lm,lm)
(pieChartToRenderable $ _pie_plot p)
] )
where
title = label (_pie_title_style p) HTA_Centre VTA_Top (_pie_title p)
lm = _pie_margin p
extraSpace :: PieChart -> BackendProgram (Double, Double)
extraSpace p = do
textSizes <- mapM (textDimension . _pitem_label) (_pie_data p)
let maxw = foldr (max.fst) 0 textSizes
let maxh = foldr (max.snd) 0 textSizes
let maxo = foldr (max._pitem_offset) 0 (_pie_data p)
let extra = label_rgap + label_rlength + maxo
return (extra + maxw, extra + maxh )
minsizePie :: PieChart -> BackendProgram (Double, Double)
minsizePie p = do
(extraw,extrah) <- extraSpace p
return (extraw * 2, extrah * 2)
renderPie :: PieChart -> (Double, Double) -> BackendProgram (PickFn a)
renderPie p (w,h) = do
(extraw,extrah) <- extraSpace p
-- let (w,h) = (p_x p2 - p_x p1, p_y p2 - p_y p1)
-- let center = Point (p_x p1 + w/2) (p_y p1 + h/2)
--
let center = Point (w/2) (h/2)
let radius = min (w - 2*extraw) (h - 2*extrah) / 2
foldM_ (paint center radius) (_pie_start_angle p)
(zip (_pie_colors p) content)
return nullPickFn
where
-- p1 = Point 0 0
-- p2 = Point w h
content = let total = sum (map _pitem_value (_pie_data p))
in [ pitem{_pitem_value=_pitem_value pitem/total}
| pitem <- _pie_data p ]
paint :: Point -> Double -> Double -> (AlphaColour Double, PieItem)
-> BackendProgram Double
paint center radius a1 (color,pitem) = do
let ax = 360.0 * _pitem_value pitem
let a2 = a1 + (ax / 2)
let a3 = a1 + ax
let offset = _pitem_offset pitem
pieSlice (ray a2 offset) a1 a3 color
pieLabel (_pitem_label pitem) a2 offset
return a3
where
pieLabel :: String -> Double -> Double -> BackendProgram ()
pieLabel name angle offset =
withFontStyle (_pie_label_style p) $
withLineStyle (_pie_label_line_style p) $ do
let p1 = ray angle (radius+label_rgap+label_rlength+offset)
p1a <- alignStrokePoint p1
(tw,_) <- textDimension name
let (offset',anchor) = if angle < 90 || angle > 270
then ((0+),HTA_Left)
else ((0-),HTA_Right)
p0 <- alignStrokePoint $ ray angle (radius + label_rgap+offset)
strokePath $ G.moveTo p0
<> lineTo p1a
<> lineTo' (p_x p1a + offset' (tw + label_rgap)) (p_y p1a)
let p2 = p1 `pvadd` Vector (offset' label_rgap) 0
drawTextA anchor VTA_Bottom p2 name
pieSlice :: Point -> Double -> Double -> AlphaColour Double -> BackendProgram ()
pieSlice (Point x y) arc1 arc2 pColor = do
let path = arc' x y radius (radian arc1) (radian arc2)
<> lineTo' x y
<> lineTo' x y
<> close
withFillStyle (FillStyleSolid pColor) $
fillPath path
withLineStyle (def { _line_color = withOpacity white 0.1 }) $
strokePath path
ray :: Double -> Double -> Point
ray angle r = Point x' y'
where
x' = x + (cos' * x'')
y' = y + (sin' * x'')
cos' = (cos . radian) angle
sin' = (sin . radian) angle
-- TODO: is x'' defined in this way to try and avoid
-- numerical rounding?
x'' = (x + r) - x
x = p_x center
y = p_y center
radian = (*(pi / 180.0))
label_rgap, label_rlength :: Double
label_rgap = 5
label_rlength = 15
$( makeLenses ''PieLayout )
$( makeLenses ''PieChart )
$( makeLenses ''PieItem )
|
