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|
-- |
-- Module : Graphics.Rendering.Chart.Plot.AreaSpots
-- Copyright : (c) Malcolm Wallace 2009
-- License : BSD-style (see COPYRIGHT file)
--
-- Area spots are a collection of unconnected filled circles,
-- with x,y position, and an independent z value to be represented
-- by the relative area of the spots.
{-# LANGUAGE TemplateHaskell #-}
module Graphics.Rendering.Chart.Plot.AreaSpots
( AreaSpots(..)
, area_spots_title
, area_spots_linethick
, area_spots_linecolour
, area_spots_fillcolour
, area_spots_opacity
, area_spots_max_radius
, area_spots_values
, AreaSpots4D(..)
, area_spots_4d_title
, area_spots_4d_linethick
, area_spots_4d_palette
, area_spots_4d_opacity
, area_spots_4d_max_radius
, area_spots_4d_values
) where
import Graphics.Rendering.Chart.Geometry hiding (scale, x0, y0)
import Graphics.Rendering.Chart.Drawing
import Graphics.Rendering.Chart.Plot.Types
import Graphics.Rendering.Chart.Axis
import Control.Lens
import Data.Colour hiding (over)
import Data.Colour.Names
import Data.Default.Class
import Control.Monad
-- | A collection of unconnected spots, with x,y position, and an
-- independent z value to be represented by the area of the spot.
data AreaSpots z x y = AreaSpots
{ _area_spots_title :: String
, _area_spots_linethick :: Double
, _area_spots_linecolour :: AlphaColour Double
, _area_spots_fillcolour :: Colour Double
, _area_spots_opacity :: Double
, _area_spots_max_radius :: Double -- ^ the largest size of spot
, _area_spots_values :: [(x,y,z)]
}
instance Default (AreaSpots z x y) where
def = AreaSpots
{ _area_spots_title = ""
, _area_spots_linethick = 0.1
, _area_spots_linecolour = opaque blue
, _area_spots_fillcolour = blue
, _area_spots_opacity = 0.2
, _area_spots_max_radius = 20 -- in pixels
, _area_spots_values = []
}
instance (PlotValue z) => ToPlot (AreaSpots z) where
toPlot p = Plot { _plot_render = renderAreaSpots p
, _plot_legend = [(_area_spots_title p, renderSpotLegend p)]
, _plot_all_points = ( map (^._1) (_area_spots_values p)
, map (^._2) (_area_spots_values p) )
}
renderAreaSpots :: (PlotValue z) => AreaSpots z x y -> PointMapFn x y -> BackendProgram ()
renderAreaSpots p pmap =
forM_ (scaleMax (_area_spots_max_radius p^(2::Integer))
(_area_spots_values p))
(\ (x,y,z)-> do
let radius = sqrt z
let psSpot = filledCircles radius $
flip withOpacity
(_area_spots_opacity p) $
_area_spots_fillcolour p
drawPoint psSpot (pmap (LValue x, LValue y))
let psOutline = hollowCircles radius
(_area_spots_linethick p)
(_area_spots_linecolour p)
drawPoint psOutline (pmap (LValue x, LValue y))
)
where
scaleMax :: PlotValue z => Double -> [(x,y,z)] -> [(x,y,Double)]
scaleMax n points = let largest = maximum (map (^._3.to toValue) points)
scale v = n * toValue v / largest
in over (mapped._3) scale points
renderSpotLegend :: AreaSpots z x y -> Rect -> BackendProgram ()
renderSpotLegend p (Rect p1 p2) = do
let radius = min (abs (p_y p1 - p_y p2)) (abs (p_x p1 - p_x p2))
centre = linearInterpolate p1 p2
psSpot = filledCircles radius $ withOpacity
(_area_spots_fillcolour p)
(_area_spots_opacity p)
psOutline = hollowCircles radius (_area_spots_linethick p)
(_area_spots_linecolour p)
drawPoint psSpot centre
drawPoint psOutline centre
where
linearInterpolate (Point x0 y0) (Point x1 y1) =
Point (x0 + abs(x1-x0)/2) (y0 + abs(y1-y0)/2)
-- | A collection of unconnected spots, with x,y position, an
-- independent z value to be represented by the area of the spot,
-- and in addition, a fourth variable t to be represented by a colour
-- from a given palette. (A linear transfer function from t to palette
-- is assumed.)
data AreaSpots4D z t x y = AreaSpots4D
{ _area_spots_4d_title :: String
, _area_spots_4d_linethick :: Double
, _area_spots_4d_palette :: [Colour Double]
, _area_spots_4d_opacity :: Double
, _area_spots_4d_max_radius :: Double -- ^ the largest size of spot
, _area_spots_4d_values :: [(x,y,z,t)]
}
instance Default (AreaSpots4D z t x y) where
def = AreaSpots4D
{ _area_spots_4d_title = ""
, _area_spots_4d_linethick = 0.1
, _area_spots_4d_palette = [ blue, green, yellow, orange, red ]
, _area_spots_4d_opacity = 0.2
, _area_spots_4d_max_radius = 20 -- in pixels
, _area_spots_4d_values = []
}
instance (PlotValue z, PlotValue t, Show t) => ToPlot (AreaSpots4D z t) where
toPlot p = Plot { _plot_render = renderAreaSpots4D p
, _plot_legend = [ (_area_spots_4d_title p
, renderSpotLegend4D p) ]
, _plot_all_points = ( map (^._1) (_area_spots_4d_values p)
, map (^._2) (_area_spots_4d_values p) )
}
renderAreaSpots4D :: (PlotValue z, PlotValue t, Show t) =>
AreaSpots4D z t x y -> PointMapFn x y -> BackendProgram ()
renderAreaSpots4D p pmap =
forM_ (scaleMax (_area_spots_4d_max_radius p^(2::Integer))
(length (_area_spots_4d_palette p))
(_area_spots_4d_values p))
(\ (x,y,z,t)-> do
let radius = sqrt z
let colour = _area_spots_4d_palette p !! t
let psSpot
= filledCircles radius $
withOpacity colour (_area_spots_4d_opacity p)
drawPoint psSpot (pmap (LValue x, LValue y))
let psOutline
= hollowCircles radius (_area_spots_4d_linethick p)
(opaque colour)
drawPoint psOutline (pmap (LValue x, LValue y))
)
where
scaleMax :: (PlotValue z, PlotValue t, Show t) =>
Double -> Int -> [(x,y,z,t)] -> [(x,y,Double,Int)]
scaleMax n c points = let largest = maximum (map (^._3.to toValue) points)
scale v = n * toValue v / largest
colVals = map (^._4.to toValue) points
colMin = minimum colVals
colMax = maximum colVals
select t = min (c-1) $
truncate ( fromIntegral c
* (toValue t-colMin)
/ (colMax-colMin))
in map (\ (x,y,z,t) -> (x,y, scale z, select t))
points
renderSpotLegend4D :: AreaSpots4D z t x y -> Rect -> BackendProgram ()
renderSpotLegend4D p (Rect p1 p2) = do
let radius = min (abs (p_y p1 - p_y p2)) (abs (p_x p1 - p_x p2))
centre = linearInterpolate p1 p2
palCol = head $ _area_spots_4d_palette p
psSpot = filledCircles radius $ withOpacity palCol
(_area_spots_4d_opacity p)
psOutline = hollowCircles radius (_area_spots_4d_linethick p)
(opaque palCol)
drawPoint psSpot centre
drawPoint psOutline centre
where
linearInterpolate (Point x0 y0) (Point x1 y1) =
Point (x0 + abs(x1-x0)/2) (y0 + abs(y1-y0)/2)
$( makeLenses ''AreaSpots )
$( makeLenses ''AreaSpots4D )
|
