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|
-----------------------------------------------------------------------------
-- |
-- Module : Graphics.Plot
-- Copyright : (c) Alberto Ruiz 2005-8
-- License : GPL-style
--
-- Maintainer : Alberto Ruiz (aruiz at um dot es)
-- Stability : provisional
-- Portability : uses gnuplot and ImageMagick
--
-- This module is deprecated. It can be replaced by improved drawing tools
-- available in the plot\\plot-gtk packages by Vivian McPhail or Gnuplot by Henning Thielemann.
-----------------------------------------------------------------------------
module Graphics.Plot(
mplot,
plot, parametricPlot,
splot, mesh, meshdom,
matrixToPGM, imshow,
gnuplotX, gnuplotpdf, gnuplotWin
) where
import Numeric.Container
import Data.List(intersperse)
import System.Process (system)
-- | From vectors x and y, it generates a pair of matrices to be used as x and y arguments for matrix functions.
meshdom :: Vector Double -> Vector Double -> (Matrix Double , Matrix Double)
meshdom r1 r2 = (outer r1 (constant 1 (dim r2)), outer (constant 1 (dim r1)) r2)
{- | Draws a 3D surface representation of a real matrix.
> > mesh $ build (10,10) (\\i j -> i + (j-5)^2)
In certain versions you can interactively rotate the graphic using the mouse.
-}
mesh :: Matrix Double -> IO ()
mesh m = gnuplotX (command++dat) where
command = "splot "++datafollows++" matrix with lines\n"
dat = prep $ toLists m
{- | Draws the surface represented by the function f in the desired ranges and number of points, internally using 'mesh'.
> > let f x y = cos (x + y)
> > splot f (0,pi) (0,2*pi) 50
-}
splot :: (Matrix Double->Matrix Double->Matrix Double) -> (Double,Double) -> (Double,Double) -> Int -> IO ()
splot f rx ry n = mesh z where
(x,y) = meshdom (linspace n rx) (linspace n ry)
z = f x y
{- | plots several vectors against the first one
> > let t = linspace 100 (-3,3) in mplot [t, sin t, exp (-t^2)]
-}
mplot :: [Vector Double] -> IO ()
mplot m = gnuplotX (commands++dats) where
commands = if length m == 1 then command1 else commandmore
command1 = "plot "++datafollows++" with lines\n" ++ dat
commandmore = "plot " ++ plots ++ "\n"
plots = concat $ intersperse ", " (map cmd [2 .. length m])
cmd k = datafollows++" using 1:"++show k++" with lines"
dat = prep $ toLists $ fromColumns m
dats = concat (replicate (length m-1) dat)
{- | Draws a list of functions over a desired range and with a desired number of points
> > plot [sin, cos, sin.(3*)] (0,2*pi) 1000
-}
plot :: [Vector Double->Vector Double] -> (Double,Double) -> Int -> IO ()
plot fs rx n = mplot (x: mapf fs x)
where x = linspace n rx
mapf gs y = map ($ y) gs
{- | Draws a parametric curve. For instance, to draw a spiral we can do something like:
> > parametricPlot (\t->(t * sin t, t * cos t)) (0,10*pi) 1000
-}
parametricPlot :: (Vector Double->(Vector Double,Vector Double)) -> (Double, Double) -> Int -> IO ()
parametricPlot f rt n = mplot [fx, fy]
where t = linspace n rt
(fx,fy) = f t
-- | writes a matrix to pgm image file
matrixToPGM :: Matrix Double -> String
matrixToPGM m = header ++ unlines (map unwords ll) where
c = cols m
r = rows m
header = "P2 "++show c++" "++show r++" "++show (round maxgray :: Int)++"\n"
maxgray = 255.0
maxval = maxElement m
minval = minElement m
scale' = if maxval == minval
then 0.0
else maxgray / (maxval - minval)
f x = show ( round ( scale' *(x - minval) ) :: Int )
ll = map (map f) (toLists m)
-- | imshow shows a representation of a matrix as a gray level image using ImageMagick's display.
imshow :: Matrix Double -> IO ()
imshow m = do
_ <- system $ "echo \""++ matrixToPGM m ++"\"| display -antialias -resize 300 - &"
return ()
----------------------------------------------------
gnuplotX :: String -> IO ()
gnuplotX command = do { _ <- system cmdstr; return()} where
cmdstr = "echo \""++command++"\" | gnuplot -persist"
datafollows = "\\\"-\\\""
prep = (++"e\n\n") . unlines . map (unwords . map show)
gnuplotpdf :: String -> String -> [([[Double]], String)] -> IO ()
gnuplotpdf title command ds = gnuplot (prelude ++ command ++" "++ draw) >> postproc where
prelude = "set terminal epslatex color; set output '"++title++".tex';"
(dats,defs) = unzip ds
draw = concat (intersperse ", " (map ("\"-\" "++) defs)) ++ "\n" ++
concatMap pr dats
postproc = do
_ <- system $ "epstopdf "++title++".eps"
mklatex
_ <- system $ "pdflatex "++title++"aux.tex > /dev/null"
_ <- system $ "pdfcrop "++title++"aux.pdf > /dev/null"
_ <- system $ "mv "++title++"aux-crop.pdf "++title++".pdf"
_ <- system $ "rm "++title++"aux.* "++title++".eps "++title++".tex"
return ()
mklatex = writeFile (title++"aux.tex") $
"\\documentclass{article}\n"++
"\\usepackage{graphics}\n"++
"\\usepackage{nopageno}\n"++
"\\usepackage{txfonts}\n"++
"\\renewcommand{\\familydefault}{phv}\n"++
"\\usepackage[usenames]{color}\n"++
"\\begin{document}\n"++
"\\begin{center}\n"++
" \\input{./"++title++".tex}\n"++
"\\end{center}\n"++
"\\end{document}"
pr = (++"e\n") . unlines . map (unwords . map show)
gnuplot cmd = do
writeFile "gnuplotcommand" cmd
_ <- system "gnuplot gnuplotcommand"
_ <- system "rm gnuplotcommand"
return ()
gnuplotWin :: String -> String -> [([[Double]], String)] -> IO ()
gnuplotWin title command ds = gnuplot (prelude ++ command ++" "++ draw) where
(dats,defs) = unzip ds
draw = concat (intersperse ", " (map ("\"-\" "++) defs)) ++ "\n" ++
concatMap pr dats
pr = (++"e\n") . unlines . map (unwords . map show)
prelude = "set title \""++title++"\";"
gnuplot cmd = do
writeFile "gnuplotcommand" cmd
_ <- system "gnuplot -persist gnuplotcommand"
_ <- system "rm gnuplotcommand"
return ()
|
